TGraph Class Reference

A Graph is a graphics object made of two arrays X and Y with npoints each.

The TGraph painting is performed thanks to the TGraphPainter class. All details about the various painting options are given in this class.

Note:* Unlike histogram or tree (or even TGraph2D), TGraph objects are not automatically attached to the current TFile, in order to keep the management and size of the TGraph has small as possible.

The picture below gives an example:

{
   TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);
   Double_t x[100], y[100];
   Int_t n = 20;
   for (Int_t i=0;i<n;i++) {
     x[i] = i*0.1;
     y[i] = 10*sin(x[i]+0.2);
   }
   gr = new TGraph(n,x,y);
   gr->Draw("AC*");
   return c1;
}

Definition at line 53 of file TGraph.h.

Public Types
enum	{ kClipFrame = BIT(10), kNotEditable = BIT(18) }
Public Types inherited from TObject
enum	EStatusBits {   kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4),   kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }
enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }
enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

Public Member Functions
	TGraph ()
	TGraph (Int_t n)
	Constructor with only the number of points set the arrays x and y will be set later. More...
	TGraph (Int_t n, const Int_t *x, const Int_t *y)
	Graph normal constructor with ints. More...
	TGraph (Int_t n, const Float_t *x, const Float_t *y)
	Graph normal constructor with floats. More...
	TGraph (Int_t n, const Double_t *x, const Double_t *y)
	Graph normal constructor with doubles. More...
	TGraph (const TGraph &gr)
	Copy constructor for this graph. More...
TGraph &	operator= (const TGraph &)
	Equal operator for this graph. More...
	TGraph (const TVectorF &vx, const TVectorF &vy)
	Graph constructor with two vectors of floats in input A graph is build with the X coordinates taken from vx and Y coord from vy The number of points in the graph is the minimum of number of points in vx and vy. More...
	TGraph (const TVectorD &vx, const TVectorD &vy)
	Graph constructor with two vectors of doubles in input A graph is build with the X coordinates taken from vx and Y coord from vy The number of points in the graph is the minimum of number of points in vx and vy. More...
	TGraph (const TH1 *h)
	Graph constructor importing its parameters from the TH1 object passed as argument. More...
	TGraph (const TF1 *f, Option_t *option="")
	Graph constructor importing its parameters from the TF1 object passed as argument. More...
	TGraph (const char *filename, const char *format="%lg %lg", Option_t *option="")
	Graph constructor reading input from filename. More...
virtual	~TGraph ()
	Graph default destructor. More...
virtual void	Apply (TF1 *f)
	Apply function f to all the data points f may be a 1-D function TF1 or 2-d function TF2 The Y values of the graph are replaced by the new values computed using the function. More...
virtual void	Browse (TBrowser *b)
	Browse. More...
virtual Double_t	Chisquare (TF1 *f1, Option_t *option="") const
	Return the chisquare of this graph with respect to f1. More...
virtual void	ComputeRange (Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax) const
	Compute the x/y range of the points in this graph. More...
virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Compute distance from point px,py to a graph. More...
virtual void	Draw (Option_t *chopt="")
	Draw this graph with its current attributes. More...
virtual void	DrawGraph (Int_t n, const Int_t *x, const Int_t *y, Option_t *option="")
	Draw this graph with new attributes. More...
virtual void	DrawGraph (Int_t n, const Float_t *x, const Float_t *y, Option_t *option="")
	Draw this graph with new attributes. More...
virtual void	DrawGraph (Int_t n, const Double_t *x=0, const Double_t *y=0, Option_t *option="")
	Draw this graph with new attributes. More...
virtual void	DrawPanel ()
	Display a panel with all graph drawing options. More...
virtual Double_t	Eval (Double_t x, TSpline *spline=0, Option_t *option="") const
	Interpolate points in this graph at x using a TSpline -if spline==0 and option="" a linear interpolation between the two points close to x is computed. More...
virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to one event. More...
virtual void	Expand (Int_t newsize)
	If array sizes <= newsize, expand storage to 2*newsize. More...
virtual void	Expand (Int_t newsize, Int_t step)
	If graph capacity is less than newsize points then make array sizes equal to least multiple of step to contain newsize points. More...
virtual TObject *	FindObject (const char *name) const
	Search object named name in the list of functions. More...
virtual TObject *	FindObject (const TObject *obj) const
	Search object obj in the list of functions. More...
virtual TFitResultPtr	Fit (const char *formula, Option_t *option="", Option_t *goption="", Axis_t xmin=0, Axis_t xmax=0)
	Fit this graph with function with name fname. More...
virtual TFitResultPtr	Fit (TF1 *f1, Option_t *option="", Option_t *goption="", Axis_t xmin=0, Axis_t xmax=0)
	Fit this graph with function f1. More...
virtual void	FitPanel ()
	Display a GUI panel with all graph fit options. More...
Bool_t	GetEditable () const
	Return kTRUE if kNotEditable bit is not set, kFALSE otherwise. More...
TF1 *	GetFunction (const char *name) const
	Return pointer to function with name. More...
TH1F *	GetHistogram () const
	Returns a pointer to the histogram used to draw the axis Takes into account the two following cases. More...
TList *	GetListOfFunctions () const
virtual Double_t	GetCorrelationFactor () const
	Return graph correlation factor. More...
virtual Double_t	GetCovariance () const
	Return covariance of vectors x,y. More...
virtual Double_t	GetMean (Int_t axis=1) const
	Return mean value of X (axis=1) or Y (axis=2) More...
virtual Double_t	GetRMS (Int_t axis=1) const
	Return RMS of X (axis=1) or Y (axis=2) More...
Int_t	GetMaxSize () const
Int_t	GetN () const
virtual Double_t	GetErrorX (Int_t bin) const
	This function is called by GraphFitChisquare. More...
virtual Double_t	GetErrorY (Int_t bin) const
	This function is called by GraphFitChisquare. More...
virtual Double_t	GetErrorXhigh (Int_t bin) const
	This function is called by GraphFitChisquare. More...
virtual Double_t	GetErrorXlow (Int_t bin) const
	This function is called by GraphFitChisquare. More...
virtual Double_t	GetErrorYhigh (Int_t bin) const
	This function is called by GraphFitChisquare. More...
virtual Double_t	GetErrorYlow (Int_t bin) const
	This function is called by GraphFitChisquare. More...
Double_t *	GetX () const
Double_t *	GetY () const
virtual Double_t *	GetEX () const
virtual Double_t *	GetEY () const
virtual Double_t *	GetEXhigh () const
virtual Double_t *	GetEXlow () const
virtual Double_t *	GetEYhigh () const
virtual Double_t *	GetEYlow () const
virtual Double_t *	GetEXlowd () const
virtual Double_t *	GetEXhighd () const
virtual Double_t *	GetEYlowd () const
virtual Double_t *	GetEYhighd () const
Double_t	GetMaximum () const
Double_t	GetMinimum () const
TAxis *	GetXaxis () const
	Get x axis of the graph. More...
TAxis *	GetYaxis () const
	Get y axis of the graph. More...
virtual Int_t	GetPoint (Int_t i, Double_t &x, Double_t &y) const
	Get x and y values for point number i. More...
virtual void	InitExpo (Double_t xmin=0, Double_t xmax=0)
	Compute Initial values of parameters for an exponential. More...
virtual void	InitGaus (Double_t xmin=0, Double_t xmax=0)
	Compute Initial values of parameters for a gaussian. More...
virtual void	InitPolynom (Double_t xmin=0, Double_t xmax=0)
	Compute Initial values of parameters for a polynom. More...
virtual Int_t	InsertPoint ()
	Insert a new point at the mouse position. More...
virtual Double_t	Integral (Int_t first=0, Int_t last=-1) const
	Integrate the TGraph data within a given (index) range. More...
virtual Bool_t	IsEditable () const
virtual Int_t	IsInside (Double_t x, Double_t y) const
	Return 1 if the point (x,y) is inside the polygon defined by the graph vertices 0 otherwise. More...
virtual void	LeastSquareFit (Int_t m, Double_t *a, Double_t xmin=0, Double_t xmax=0)
	Least squares polynomial fitting without weights. More...
virtual void	LeastSquareLinearFit (Int_t n, Double_t &a0, Double_t &a1, Int_t &ifail, Double_t xmin=0, Double_t xmax=0)
	Least square linear fit without weights. More...
virtual Int_t	Merge (TCollection *list)
	Adds all graphs from the collection to this graph. More...
virtual void	Paint (Option_t *chopt="")
	Draw this graph with its current attributes. More...
void	PaintGraph (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
	Draw the (x,y) as a graph. More...
void	PaintGrapHist (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
	Draw the (x,y) as a histogram. More...
virtual void	PaintStats (TF1 *fit)
	Draw the stats. More...
virtual void	Print (Option_t *chopt="") const
	Print graph values. More...
virtual void	RecursiveRemove (TObject *obj)
	Recursively remove object from the list of functions. More...
virtual Int_t	RemovePoint ()
	Delete point close to the mouse position. More...
virtual Int_t	RemovePoint (Int_t ipoint)
	Delete point number ipoint. More...
virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save primitive as a C++ statement(s) on output stream out. More...
virtual void	SetEditable (Bool_t editable=kTRUE)
	if editable=kFALSE, the graph cannot be modified with the mouse by default a TGraph is editable More...
virtual void	SetHistogram (TH1F *h)
virtual void	SetMaximum (Double_t maximum=-1111)
	Set the maximum of the graph. More...
virtual void	SetMinimum (Double_t minimum=-1111)
	Set the minimum of the graph. More...
virtual void	Set (Int_t n)
	Set number of points in the graph Existing coordinates are preserved New coordinates above fNpoints are preset to 0. More...
virtual void	SetPoint (Int_t i, Double_t x, Double_t y)
	Set x and y values for point number i. More...
virtual void	SetTitle (const char *title="")
	Set graph title. More...
virtual void	Sort (Bool_t(*greater)(const TGraph *, Int_t, Int_t)=&TGraph::CompareX, Bool_t ascending=kTRUE, Int_t low=0, Int_t high=-1111)
	Sorts the points of this TGraph using in-place quicksort (see e.g. More...
virtual void	UseCurrentStyle ()
	Set current style settings in this graph This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...
void	Zero (Int_t &k, Double_t AZ, Double_t BZ, Double_t E2, Double_t &X, Double_t &Y, Int_t maxiterations)
	Find zero of a continuous function. More...
Public Member Functions inherited from TNamed
	TNamed ()
	TNamed (const char *name, const char *title)
	TNamed (const TString &name, const TString &title)
	TNamed (const TNamed &named)
TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator. More...
virtual	~TNamed ()
virtual void	Clear (Option_t *option="")
	Set name and title to empty strings (""). More...
virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...
virtual Int_t	Compare (const TObject *obj) const
	Compare two TNamed objects. More...
virtual void	Copy (TObject &named) const
	Copy this to obj. More...
virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer. More...
virtual const char *	GetName () const
	Returns name of object. More...
virtual const char *	GetTitle () const
	Returns title of object. More...
virtual ULong_t	Hash () const
	Return hash value for this object. More...
virtual Bool_t	IsSortable () const
virtual void	SetName (const char *name)
	Change (i.e. More...
virtual void	SetNameTitle (const char *name, const char *title)
	Change (i.e. set) all the TNamed parameters (name and title). More...
virtual void	ls (Option_t *option="") const
	List TNamed name and title. More...
virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject. More...
Public Member Functions inherited from TObject
	TObject ()
	TObject (const TObject &object)
	TObject copy ctor. More...
TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...
virtual	~TObject ()
	TObject destructor. More...
virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...
virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...
virtual void	Delete (Option_t *option="")
	Delete this object. More...
virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...
virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...
virtual void	Dump () const
	Dump contents of object on stdout. More...
virtual void	Execute (const char *method, const char *params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...
virtual void	Execute (TMethod *method, TObjArray *params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...
virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...
virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...
virtual const char *	GetIconName () const
	Returns mime type name of object. More...
virtual Option_t *	GetOption () const
virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...
virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...
virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...
virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...
virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...
virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...
Bool_t	IsOnHeap () const
Bool_t	IsZombie () const
virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...
virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...
virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...
virtual void	SaveAs (const char *filename="", Option_t *option="") const
	Save this object in the file specified by filename. More...
virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...
virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...
virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory. More...
virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory. More...
void *	operator new (size_t sz)
void *	operator new[] (size_t sz)
void *	operator new (size_t sz, void *vp)
void *	operator new[] (size_t sz, void *vp)
void	operator delete (void *ptr)
	Operator delete. More...
void	operator delete[] (void *ptr)
	Operator delete []. More...
void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...
void	SetBit (UInt_t f)
void	ResetBit (UInt_t f)
Bool_t	TestBit (UInt_t f) const
Int_t	TestBits (UInt_t f) const
void	InvertBit (UInt_t f)
virtual void	Info (const char *method, const char *msgfmt,...) const
	Issue info message. More...
virtual void	Warning (const char *method, const char *msgfmt,...) const
	Issue warning message. More...
virtual void	Error (const char *method, const char *msgfmt,...) const
	Issue error message. More...
virtual void	SysError (const char *method, const char *msgfmt,...) const
	Issue system error message. More...
virtual void	Fatal (const char *method, const char *msgfmt,...) const
	Issue fatal error message. More...
void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...
void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...
void	Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...
Public Member Functions inherited from TAttLine
	TAttLine ()
	AttLine default constructor. More...
	TAttLine (Color_t lcolor, Style_t lstyle, Width_t lwidth)
	AttLine normal constructor. More...
virtual	~TAttLine ()
	AttLine destructor. More...
void	Copy (TAttLine &attline) const
	Copy this line attributes to a new TAttLine. More...
Int_t	DistancetoLine (Int_t px, Int_t py, Double_t xp1, Double_t yp1, Double_t xp2, Double_t yp2)
	Compute distance from point px,py to a line. More...
virtual Color_t	GetLineColor () const
virtual Style_t	GetLineStyle () const
virtual Width_t	GetLineWidth () const
virtual void	Modify ()
	Change current line attributes if necessary. More...
virtual void	ResetAttLine (Option_t *option="")
	Reset this line attributes to default values. More...
virtual void	SaveLineAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1, Int_t widdef=1)
	Save line attributes as C++ statement(s) on output stream out. More...
virtual void	SetLineAttributes ()
	Invoke the DialogCanvas Line attributes. More...
virtual void	SetLineColor (Color_t lcolor)
virtual void	SetLineColorAlpha (Color_t lcolor, Float_t lalpha)
	Set a transparent line color. More...
virtual void	SetLineStyle (Style_t lstyle)
virtual void	SetLineWidth (Width_t lwidth)
	ClassDef (TAttLine, 2)
Public Member Functions inherited from TAttFill
	TAttFill ()
	TAttFill (Color_t fcolor, Style_t fstyle)
	AttFill normal constructor. More...
virtual	~TAttFill ()
	AttFill destructor. More...
void	Copy (TAttFill &attfill) const
	Copy this fill attributes to a new TAttFill. More...
virtual Color_t	GetFillColor () const
virtual Style_t	GetFillStyle () const
virtual Bool_t	IsTransparent () const
virtual void	Modify ()
	Change current fill area attributes if necessary. More...
virtual void	ResetAttFill (Option_t *option="")
	Reset this fill attributes to default values. More...
virtual void	SaveFillAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1001)
	Save fill attributes as C++ statement(s) on output stream out. More...
virtual void	SetFillAttributes ()
	Invoke the DialogCanvas Fill attributes. More...
virtual void	SetFillColor (Color_t fcolor)
virtual void	SetFillColorAlpha (Color_t fcolor, Float_t falpha)
	Set a transparent fill color. More...
virtual void	SetFillStyle (Style_t fstyle)
Public Member Functions inherited from TAttMarker
	TAttMarker ()
	TAttMarker (Color_t color, Style_t style, Size_t msize)
	TAttMarker normal constructor. More...
virtual	~TAttMarker ()
	TAttMarker destructor. More...
void	Copy (TAttMarker &attmarker) const
	Copy this marker attributes to a new TAttMarker. More...
virtual Color_t	GetMarkerColor () const
virtual Style_t	GetMarkerStyle () const
virtual Size_t	GetMarkerSize () const
virtual void	Modify ()
	Change current marker attributes if necessary. More...
virtual void	ResetAttMarker (Option_t *toption="")
	Reset this marker attributes to the default values. More...
virtual void	SaveMarkerAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1, Int_t sizdef=1)
	Save line attributes as C++ statement(s) on output stream out. More...
virtual void	SetMarkerAttributes ()
	Invoke the DialogCanvas Marker attributes. More...
virtual void	SetMarkerColor (Color_t mcolor=1)
virtual void	SetMarkerColorAlpha (Color_t mcolor, Float_t malpha)
	Set a transparent marker color. More...
virtual void	SetMarkerStyle (Style_t mstyle=1)
virtual void	SetMarkerSize (Size_t msize=1)
	ClassDef (TAttMarker, 2)

Static Public Member Functions
static Bool_t	CompareArg (const TGraph *gr, Int_t left, Int_t right)
	Return kTRUE if point number "left"'s argument (angle with respect to positive x-axis) is bigger than that of point number "right". More...
static Bool_t	CompareX (const TGraph *gr, Int_t left, Int_t right)
	Return kTRUE if fX[left] > fX[right]. Can be used by Sort. More...
static Bool_t	CompareY (const TGraph *gr, Int_t left, Int_t right)
	Return kTRUE if fY[left] > fY[right]. Can be used by Sort. More...
static Bool_t	CompareRadius (const TGraph *gr, Int_t left, Int_t right)
	Return kTRUE if point number "left"'s distance to origin is bigger than that of point number "right". More...
Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...
static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...
static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...
static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

Protected Member Functions
virtual void	SwapPoints (Int_t pos1, Int_t pos2)
	Swap points. More...
virtual Double_t **	Allocate (Int_t newsize)
Double_t **	AllocateArrays (Int_t Narrays, Int_t arraySize)
	Allocate arrays. More...
virtual Bool_t	CopyPoints (Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
	Copy points from fX and fY to arrays[0] and arrays[1] or to fX and fY if arrays == 0 and ibegin != iend. More...
virtual void	CopyAndRelease (Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
	Copy points from fX and fY to arrays[0] and arrays[1] or to fX and fY if arrays == 0 and ibegin != iend. More...
Bool_t	CtorAllocate ()
	In constructors set fNpoints than call this method. More...
Double_t **	ExpandAndCopy (Int_t size, Int_t iend)
	if size > fMaxSize allocate new arrays of 2*size points and copy iend first points. More...
virtual void	FillZero (Int_t begin, Int_t end, Bool_t from_ctor=kTRUE)
	Set zero values for point arrays in the range [begin, end) Should be redefined in descendant classes. More...
Double_t **	ShrinkAndCopy (Int_t size, Int_t iend)
	if size*2 <= fMaxSize allocate new arrays of size points, copy points [0,oend). More...
virtual Bool_t	DoMerge (const TGraph *g)
	protected function to perform the merge operation of a graph More...
Protected Member Functions inherited from TObject
void	MakeZombie ()
virtual void	DoError (int level, const char *location, const char *fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

Static Protected Member Functions
static void	SwapValues (Double_t *arr, Int_t pos1, Int_t pos2)
	Swap values. More...

Protected Attributes
Int_t	fMaxSize
Int_t	fNpoints
	Current dimension of arrays fX and fY. More...
Double_t *	fX
Double_t *	fY
TList *	fFunctions
TH1F *	fHistogram
Double_t	fMinimum
Double_t	fMaximum
Protected Attributes inherited from TNamed
TString	fName
TString	fTitle
Protected Attributes inherited from TAttLine
Color_t	fLineColor
Style_t	fLineStyle
Width_t	fLineWidth
Protected Attributes inherited from TAttFill
Color_t	fFillColor
Style_t	fFillStyle
Protected Attributes inherited from TAttMarker
Color_t	fMarkerColor
Style_t	fMarkerStyle
Size_t	fMarkerSize

#include <TGraph.h>

Inheritance diagram for TGraph:

Collaboration diagram for TGraph:

Member Enumeration Documentation

anonymous enum

Enumerator
kClipFrame
kNotEditable

Definition at line 81 of file TGraph.h.

Constructor & Destructor Documentation

TGraph::TGraph

(

)

Referenced by DrawGraph().

TGraph::TGraph

(

Int_t

n

)

Constructor with only the number of points set the arrays x and y will be set later.

Definition at line 90 of file TGraph.cxx.

TGraph::TGraph	(	Int_t	n,
		const Int_t *	x,
		const Int_t *	y
	)

Graph normal constructor with ints.

Definition at line 101 of file TGraph.cxx.

TGraph::TGraph	(	Int_t	n,
		const Float_t *	x,
		const Float_t *	y
	)

Graph normal constructor with floats.

Definition at line 119 of file TGraph.cxx.

TGraph::TGraph	(	Int_t	n,
		const Double_t *	x,
		const Double_t *	y
	)

Graph normal constructor with doubles.

Definition at line 137 of file TGraph.cxx.

TGraph::TGraph

(

const TGraph &

gr

)

Copy constructor for this graph.

Definition at line 154 of file TGraph.cxx.

TGraph::TGraph	(	const TVectorF &	vx,
		const TVectorF &	vy
	)

Graph constructor with two vectors of floats in input A graph is build with the X coordinates taken from vx and Y coord from vy The number of points in the graph is the minimum of number of points in vx and vy.

Definition at line 241 of file TGraph.cxx.

TGraph::TGraph	(	const TVectorD &	vx,
		const TVectorD &	vy
	)

Graph constructor with two vectors of doubles in input A graph is build with the X coordinates taken from vx and Y coord from vy The number of points in the graph is the minimum of number of points in vx and vy.

Definition at line 260 of file TGraph.cxx.

TGraph::TGraph

(

const TH1 *

h

)

Graph constructor importing its parameters from the TH1 object passed as argument.

Definition at line 276 of file TGraph.cxx.

TGraph::TGraph	(	const TF1 *	f,
		Option_t *	option = ""
	)

Graph constructor importing its parameters from the TF1 object passed as argument.

• if option =="" (default), a TGraph is created with points computed at the fNpx points of f.
• if option =="d", a TGraph is created with points computed with the derivatives at the fNpx points of f.
• if option =="i", a TGraph is created with points computed with the integral at the fNpx points of f.
• if option =="I", a TGraph is created with points computed with the integral at the fNpx+1 points of f and the integral is normalized to 1.

Definition at line 318 of file TGraph.cxx.

TGraph::TGraph	(	const char *	filename,
		const char *	format = "%lg %lg",
		Option_t *	option = ""
	)

Graph constructor reading input from filename.

filename is assumed to contain at least two columns of numbers. the string format is by default "%lg %lg". this is a standard c formatting for scanf. If columns of numbers should be skipped, a "%*lg" or "%*s" for each column can be added, e.g. "%lg %*lg %lg" would read x-values from the first and y-values from the third column. For files separated by a specific delimiter different from ' ' and '' (e.g. ';' in csv files) you can avoid using %*s to bypass this delimiter by explicitly specify the "option" argument, e.g. option=" \t,;" for columns of figures separated by any of these characters (' ', '', ',', ';') used once (e.g. "1;1") or in a combined way (" 1;,;; 1"). Note in that case, the instantiation is about 2 times slower.

Definition at line 377 of file TGraph.cxx.

TGraph::~TGraph ( )

virtual

Graph default destructor.

Definition at line 498 of file TGraph.cxx.

Member Function Documentation

Double_t ** TGraph::Allocate ( Int_t  newsize )

inlineprotectedvirtual

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 191 of file TGraph.h.

Referenced by Expand(), ExpandAndCopy(), Set(), and ShrinkAndCopy().

Double_t ** TGraph::AllocateArrays ( Int_t  Narrays, Int_t  arraySize  )

protected

Allocate arrays.

Definition at line 522 of file TGraph.cxx.

Referenced by TGraphErrors::Allocate(), TGraphAsymmErrors::Allocate(), TGraphBentErrors::Allocate(), and Allocate().

void TGraph::Apply ( TF1 *  f )

virtual

Apply function f to all the data points f may be a 1-D function TF1 or 2-d function TF2 The Y values of the graph are replaced by the new values computed using the function.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 545 of file TGraph.cxx.

void TGraph::Browse ( TBrowser *  b )

virtual

Browse.

Reimplemented from TObject.

Definition at line 560 of file TGraph.cxx.

Double_t TGraph::Chisquare ( TF1 *  func, Option_t *  option = ""  ) const

virtual

Return the chisquare of this graph with respect to f1.

The chisquare is computed as the sum of the quantity below at each point:

\[ \frac{(y-f1(x))^{2}}{ey^{2}+(\frac{1}{2}(exl+exh)f1'(x))^{2}} \]

where x and y are the graph point coordinates and f1'(x) is the derivative of function f1(x). This method to approximate the uncertainty in y because of the errors in x, is called "effective variance" method. In case of a pure TGraph, the denominator is 1. In case of a TGraphErrors or TGraphAsymmErrors the errors are taken into account. By default the range of the graph is used whatever function range. Use option "R" to use the function range

Definition at line 586 of file TGraph.cxx.

Bool_t TGraph::CompareArg ( const TGraph *  gr, Int_t  left, Int_t  right  )

static

Return kTRUE if point number "left"'s argument (angle with respect to positive x-axis) is bigger than that of point number "right".

Can be used by Sort.

Definition at line 603 of file TGraph.cxx.

Bool_t TGraph::CompareRadius ( const TGraph *  gr, Int_t  left, Int_t  right  )

static

Return kTRUE if point number "left"'s distance to origin is bigger than that of point number "right".

Can be used by Sort.

Definition at line 631 of file TGraph.cxx.

Bool_t TGraph::CompareX ( const TGraph *  gr, Int_t  left, Int_t  right  )

static

Return kTRUE if fX[left] > fX[right]. Can be used by Sort.

Definition at line 614 of file TGraph.cxx.

Bool_t TGraph::CompareY ( const TGraph *  gr, Int_t  left, Int_t  right  )

static

Return kTRUE if fY[left] > fY[right]. Can be used by Sort.

Definition at line 622 of file TGraph.cxx.

void TGraph::ComputeRange ( Double_t &  xmin, Double_t &  ymin, Double_t &  xmax, Double_t &  ymax  ) const

virtual

Compute the x/y range of the points in this graph.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 640 of file TGraph.cxx.

Referenced by TGraphErrors::ComputeRange(), TGraphAsymmErrors::ComputeRange(), TGraphBentErrors::ComputeRange(), GetHistogram(), TMultiGraph::Paint(), TGraphPainter::PaintGraph(), and TMultiGraph::PaintPolyLine3D().

void TGraph::CopyAndRelease ( Double_t **  newarrays, Int_t  ibegin, Int_t  iend, Int_t  obegin  )

protectedvirtual

Copy points from fX and fY to arrays[0] and arrays[1] or to fX and fY if arrays == 0 and ibegin != iend.

If newarrays is non null, replace fX, fY with pointers from newarrays[0,1]. Delete newarrays, old fX and fY

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 671 of file TGraph.cxx.

Referenced by Expand(), InsertPoint(), RemovePoint(), Set(), and SetPoint().

Bool_t TGraph::CopyPoints ( Double_t **  arrays, Int_t  ibegin, Int_t  iend, Int_t  obegin  )

protectedvirtual

Copy points from fX and fY to arrays[0] and arrays[1] or to fX and fY if arrays == 0 and ibegin != iend.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 688 of file TGraph.cxx.

Referenced by CopyAndRelease(), TGraphErrors::CopyPoints(), TGraphAsymmErrors::CopyPoints(), TGraphBentErrors::CopyPoints(), ExpandAndCopy(), and ShrinkAndCopy().

Bool_t TGraph::CtorAllocate ( void  )

protected

In constructors set fNpoints than call this method.

Return kFALSE if the graph will contain no points. Note: This function should be called only from the constructor since it does not delete previously existing arrays

Definition at line 714 of file TGraph.cxx.

Referenced by TGraph(), TGraphAsymmErrors::TGraphAsymmErrors(), and TGraphQQ::TGraphQQ().

Int_t TGraph::DistancetoPrimitive ( Int_t  px, Int_t  py  )

virtual

Compute distance from point px,py to a graph.

Compute the closest distance of approach from point px,py to this line. The distance is computed in pixels units.

Reimplemented from TObject.

Definition at line 781 of file TGraph.cxx.

Referenced by TMultiGraph::DistancetoPrimitive(), TTreePerfStats::DistancetoPrimitive(), and TEfficiency::DistancetoPrimitive().

Bool_t TGraph::DoMerge ( const TGraph *  g )

protectedvirtual

protected function to perform the merge operation of a graph

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 2368 of file TGraph.cxx.

Referenced by TGraphErrors::DoMerge(), TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), and Merge().

void TGraph::Draw ( Option_t *  option = "" )

virtual

Draw this graph with its current attributes.

The options to draw a graph are described in TGraphPainter class.

Reimplemented from TObject.

Reimplemented in TGraphPolar.

Definition at line 740 of file TGraph.cxx.

Referenced by ApplicationWindow::ApplicationWindow(), TMVA::bdtcontrolplots(), binarySearchTime(), Browse(), doFit(), TProofProgressDialog::DoPlotRateGraph(), RooStats::HypoTestInverterPlot::Draw(), RooStats::LikelihoodIntervalPlot::Draw(), RooStats::MCMCIntervalPlot::DrawChainScatter(), TAdvancedGraphicsDialog::DrawConfidenceLevels(), TAdvancedGraphicsDialog::DrawContour(), TProofBench::DrawCPU(), TProofBench::DrawDataSet(), TF1::DrawDerivative(), TProofBench::DrawEfficiency(), TKDE::DrawErrors(), DrawFunction(), TF1::DrawIntegral(), RooStats::MCMCIntervalPlot::DrawNLLVsTime(), RooStats::MCMCIntervalPlot::DrawParameterVsTime(), drawPoints(), TGeoPainter::DrawPolygon(), TAdvancedGraphicsDialog::DrawScan(), ErrorBand(), interpolate(), TMultiGraph::PaintPads(), piRandom(), TCreatePrimitives::PolyLine(), TMVA::regression_averagedevs(), simanTSP(), stdsort(), TSelectorDraw::TakeAction(), TSelectorDraw::TakeEstimate(), testInterpolation(), testPermute(), TestSpeed(), and unuranGraf().

void TGraph::DrawGraph ( Int_t  n, const Int_t *  x, const Int_t *  y, Option_t *  option = ""  )

virtual

Draw this graph with new attributes.

Definition at line 791 of file TGraph.cxx.

void TGraph::DrawGraph ( Int_t  n, const Float_t *  x, const Float_t *  y, Option_t *  option = ""  )

virtual

Draw this graph with new attributes.

Definition at line 804 of file TGraph.cxx.

void TGraph::DrawGraph ( Int_t  n, const Double_t *  x = 0, const Double_t *  y = 0, Option_t *  option = ""  )

virtual

Draw this graph with new attributes.

Definition at line 817 of file TGraph.cxx.

void TGraph::DrawPanel ( )

virtual

Display a panel with all graph drawing options.

Definition at line 834 of file TGraph.cxx.

Double_t TGraph::Eval ( Double_t  x, TSpline *  spline = 0, Option_t *  option = ""  ) const

virtual

Interpolate points in this graph at x using a TSpline -if spline==0 and option="" a linear interpolation between the two points close to x is computed.

If x is outside the graph range, a linear extrapolation is computed. -if spline==0 and option="S" a TSpline3 object is created using this graph and the interpolated value from the spline is returned. the internally created spline is deleted on return. -if spline is specified, it is used to return the interpolated value.

Definition at line 850 of file TGraph.cxx.

void TGraph::ExecuteEvent ( Int_t  event, Int_t  px, Int_t  py  )

virtual

Execute action corresponding to one event.

This member function is called when a graph is clicked with the locator

If Left button clicked on one of the line end points, this point follows the cursor until button is released.

if Middle button clicked, the line is moved parallel to itself until the button is released.

Reimplemented from TObject.

Definition at line 940 of file TGraph.cxx.

Referenced by TEfficiency::ExecuteEvent().

void TGraph::Expand ( Int_t  newsize )

virtual

If array sizes <= newsize, expand storage to 2*newsize.

Definition at line 949 of file TGraph.cxx.

void TGraph::Expand ( Int_t  newsize, Int_t  step  )

virtual

If graph capacity is less than newsize points then make array sizes equal to least multiple of step to contain newsize points.

Returns kTRUE if size was altered

Definition at line 960 of file TGraph.cxx.

Double_t ** TGraph::ExpandAndCopy ( Int_t  size, Int_t  iend  )

protected

if size > fMaxSize allocate new arrays of 2*size points and copy iend first points.

Return pointer to new arrays.

Definition at line 974 of file TGraph.cxx.

Referenced by Expand(), InsertPoint(), and SetPoint().

void TGraph::FillZero ( Int_t  begin, Int_t  end, Bool_t  from_ctor = kTRUE  )

protectedvirtual

Set zero values for point arrays in the range [begin, end) Should be redefined in descendant classes.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 988 of file TGraph.cxx.

Referenced by TGraphErrors::FillZero(), TGraphAsymmErrors::FillZero(), TGraphBentErrors::FillZero(), InsertPoint(), Set(), SetPoint(), and TGraph().

TObject * TGraph::FindObject ( const char *  name ) const

virtual

Search object named name in the list of functions.

Reimplemented from TObject.

Definition at line 997 of file TGraph.cxx.

TObject * TGraph::FindObject ( const TObject *  obj ) const

virtual

Search object obj in the list of functions.

Reimplemented from TObject.

Definition at line 1006 of file TGraph.cxx.

TFitResultPtr TGraph::Fit ( const char *  fname, Option_t *  option = "", Option_t *  goption = "", Axis_t  xmin = 0, Axis_t  xmax = 0  )

virtual

Fit this graph with function with name fname.

interface to TGraph::Fit(TF1 *f1...

fname is the name of an already predefined function created by TF1 or TF2 Predefined functions such as gaus, expo and poln are automatically created by ROOT.

fname can also be a formula, accepted by the linear fitter (linear parts divided by "++" sign), for example "x++sin(x)" for fitting "[0]*x+[1]*sin(x)"

Definition at line 1024 of file TGraph.cxx.

Referenced by doFit(), TProofBench::DrawCPU(), TProofBench::DrawDataSet(), testGraphFit(), and testHisto1DFit().

TFitResultPtr TGraph::Fit ( TF1 *  f1, Option_t *  option = "", Option_t *  goption = "", Axis_t  rxmin = 0, Axis_t  rxmax = 0  )

virtual

Fit this graph with function f1.

f1 is an already predefined function created by TF1. Predefined functions such as gaus, expo and poln are automatically created by ROOT.

The list of fit options is given in parameter option.

option	description
"W"	Set all weights to 1; ignore error bars
"U"	Use a User specified fitting algorithm (via SetFCN)
"Q"	Quiet mode (minimum printing)
"V"	Verbose mode (default is between Q and V)
"E"	Perform better Errors estimation using Minos technique
"B"	User defined parameter settings are used for predefined functions like "gaus", "expo", "poln", "landau". Use this option when you want to fix one or more parameters for these functions.
"M"	More. Improve fit results. It uses the IMPROVE command of TMinuit (see TMinuit::mnimpr). This algorithm attempts to improve the found local minimum by searching for a better one.
"R"	Use the Range specified in the function range
"N"	Do not store the graphics function, do not draw
"0"	Do not plot the result of the fit. By default the fitted function is drawn unless the option "N" above is specified.
"+"	Add this new fitted function to the list of fitted functions (by default, any previous function is deleted)
"C"	In case of linear fitting, do not calculate the chisquare (saves time)
"F"	If fitting a polN, use the minuit fitter
"EX0"	When fitting a TGraphErrors or TGraphAsymErrors do not consider errors in the coordinate
"ROB"	In case of linear fitting, compute the LTS regression coefficients (robust (resistant) regression), using the default fraction of good points "ROB=0.x" - compute the LTS regression coefficients, using 0.x as a fraction of good points
"S"	The result of the fit is returned in the TFitResultPtr (see below Access to the Fit Result)

When the fit is drawn (by default), the parameter goption may be used to specify a list of graphics options. See TGraphPainter for a complete list of these options.

In order to use the Range option, one must first create a function with the expression to be fitted. For example, if your graph has a defined range between -4 and 4 and you want to fit a gaussian only in the interval 1 to 3, you can do:

   TF1 *f1 = new TF1("f1","gaus",1,3);
   graph->Fit("f1","R");

Who is calling this function:

Note that this function is called when calling TGraphErrors::Fit or TGraphAsymmErrors::Fit ot TGraphBentErrors::Fit See the discussion below on error calculation.

Linear fitting:

When the fitting function is linear (contains the "++" sign) or the fitting function is a polynomial, a linear fitter is initialised. To create a linear function, use the following syntax: linear parts separated by "++" sign. Example: to fit the parameters of "[0]*x + [1]*sin(x)", create a TF1 *f1=new TF1("f1", "x++sin(x)", xmin, xmax); For such a TF1 you don't have to set the initial conditions. Going via the linear fitter for functions, linear in parameters, gives a considerable advantage in speed.

Setting initial conditions:

Parameters must be initialized before invoking the Fit function. The setting of the parameter initial values is automatic for the predefined functions : poln, expo, gaus, landau. One can however disable this automatic computation by specifying the option "B". You can specify boundary limits for some or all parameters via

 f1->SetParLimits(p_number, parmin, parmax);

If parmin>=parmax, the parameter is fixed Note that you are not forced to fix the limits for all parameters. For example, if you fit a function with 6 parameters, you can do:

func->SetParameters(0,3.1,1.e-6,0.1,-8,100); func->SetParLimits(4,-10,-4); func->SetParLimits(5, 1,1); With this setup, parameters 0->3 can vary freely. Parameter 4 has boundaries [-10,-4] with initial value -8. Parameter 5 is fixed to 100.

Fit range:

The fit range can be specified in two ways:

• specify rxmax > rxmin (default is rxmin=rxmax=0)
• specify the option "R". In this case, the function will be taken instead of the full graph range.

Changing the fitting function:

By default a chi2 fitting function is used for fitting a TGraph. The function is implemented in FitUtil::EvaluateChi2. In case of TGraphErrors an effective chi2 is used (see below TGraphErrors fit) To specify a User defined fitting function, specify option "U" and call the following functions:

TVirtualFitter::Fitter(mygraph)->SetFCN(MyFittingFunction) where MyFittingFunction is of type: extern void MyFittingFunction(Int_t &npar, Double_t *gin, Double_t &f, Double_t *u, Int_t flag);

TGraphErrors fit:

In case of a TGraphErrors object, when x errors are present, the error along x, is projected along the y-direction by calculating the function at the points x-exlow and x+exhigh. The chisquare is then computed as the sum of the quantity below at each point:

\[ \frac{(y-f(x))^{2}}{ey^{2}+(\frac{1}{2}(exl+exh)f'(x))^{2}} \]

where x and y are the point coordinates, and f'(x) is the derivative of the function f(x).

In case the function lies below (above) the data point, ey is ey_low (ey_high).

thanks to Andy Haas (haas@.nosp@m.yaho.nosp@m.o.com) for adding the case with TGraphAsymmErrors University of Washington

The approach used to approximate the uncertainty in y because of the errors in x is to make it equal the error in x times the slope of the line. The improvement, compared to the first method (f(x+ exhigh) - f(x-exlow))/2 is of (error of x)**2 order. This approach is called "effective variance method". This improvement has been made in version 4.00/08 by Anna Kreshuk. The implementation is provided in the function FitUtil::EvaluateChi2Effective

NOTE:

1. By using the "effective variance" method a simple linear regression becomes a non-linear case, which takes several iterations instead of 0 as in the linear case.
2. The effective variance technique assumes that there is no correlation between the x and y coordinate.
3. The standard chi2 (least square) method without error in the coordinates (x) can be forced by using option "EX0"
4. The linear fitter doesn't take into account the errors in x. When fitting a TGraphErrors with a linear functions the errors in x will not be considered. If errors in x are important, go through minuit (use option "F" for polynomial fitting).
5. When fitting a TGraph (i.e. no errors associated with each point), a correction is applied to the errors on the parameters with the following formula: errorp *= sqrt(chisquare/(ndf-1))

Access to the fit result

The function returns a TFitResultPtr which can hold a pointer to a TFitResult object. By default the TFitResultPtr contains only the status of the fit which is return by an automatic conversion of the TFitResultPtr to an integer. One can write in this case directly:

Int_t fitStatus =  h->Fit(myFunc)

If the option "S" is instead used, TFitResultPtr contains the TFitResult and behaves as a smart pointer to it. For example one can do:

TFitResultPtr r = h->Fit(myFunc,"S");
TMatrixDSym cov = r->GetCovarianceMatrix();  //  to access the covariance matrix
Double_t chi2   = r->Chi2(); // to retrieve the fit chi2
Double_t par0   = r->Value(0); // retrieve the value for the parameter 0
Double_t err0   = r->ParError(0); // retrieve the error for the parameter 0
r->Print("V");     // print full information of fit including covariance matrix
r->Write();        // store the result in a file

The fit parameters, error and chi2 (but not covariance matrix) can be retrieved also from the fitted function. If the histogram is made persistent, the list of associated functions is also persistent. Given a pointer (see above) to an associated function myfunc, one can retrieve the function/fit parameters with calls such as:

Double_t chi2 = myfunc->GetChisquare();
Double_t par0 = myfunc->GetParameter(0); //value of 1st parameter
Double_t err0 = myfunc->GetParError(0);  //error on first parameter

Access to the fit status

The status of the fit can be obtained converting the TFitResultPtr to an integer independently if the fit option "S" is used or not:

 TFitResultPtr r = h->Fit(myFunc,opt);
 Int_t fitStatus = r;

The fitStatus is 0 if the fit is OK (i.e. no error occurred). The value of the fit status code is negative in case of an error not connected with the minimization procedure, for example when a wrong function is used. Otherwise the return value is the one returned from the minimization procedure. When TMinuit (default case) or Minuit2 are used as minimizer the status returned is : fitStatus = migradResult + 10*minosResult + 100*hesseResult + 1000*improveResult. TMinuit will return 0 (for migrad, minos, hesse or improve) in case of success and 4 in case of error (see the documentation of TMinuit::mnexcm). So for example, for an error only in Minos but not in Migrad a fitStatus of 40 will be returned. Minuit2 will return also 0 in case of success and different values in migrad, minos or hesse depending on the error. See in this case the documentation of Minuit2Minimizer::Minimize for the migradResult, Minuit2Minimizer::GetMinosError for the minosResult and Minuit2Minimizer::Hesse for the hesseResult. If other minimizers are used see their specific documentation for the status code returned. For example in the case of Fumili, for the status returned see TFumili::Minimize.

Associated functions:

One or more object (typically a TF1*) can be added to the list of functions (fFunctions) associated with each graph. When TGraph::Fit is invoked, the fitted function is added to this list. Given a graph gr, one can retrieve an associated function with: TF1 *myfunc = gr->GetFunction("myfunc");

If the graph is made persistent, the list of associated functions is also persistent. Given a pointer (see above) to an associated function myfunc, one can retrieve the function/fit parameters with calls such as:

Double_t chi2 = myfunc->GetChisquare();
Double_t par0 = myfunc->GetParameter(0); //value of 1st parameter
Double_t err0 = myfunc->GetParError(0);  //error on first parameter

Fit Statistics

You can change the statistics box to display the fit parameters with the TStyle::SetOptFit(mode) method. This mode has four digits. mode = pcev (default = 0111)

v = 1;  print name/values of parameters
e = 1;  print errors (if e=1, v must be 1)
c = 1;  print Chisquare/Number of degrees of freedom
p = 1;  print Probability

For example: gStyle->SetOptFit(1011); prints the fit probability, parameter names/values, and errors. You can change the position of the statistics box with these lines (where g is a pointer to the TGraph):

Root > TPaveStats *st = (TPaveStats*)g->GetListOfFunctions()->FindObject("stats")
Root > st->SetX1NDC(newx1); //new x start position
Root > st->SetX2NDC(newx2); //new x end position

Definition at line 1268 of file TGraph.cxx.

void TGraph::FitPanel ( )

virtual

Display a GUI panel with all graph fit options.

See class TFitEditor for example

Definition at line 1283 of file TGraph.cxx.

Double_t TGraph::GetCorrelationFactor ( ) const

virtual

Return graph correlation factor.

Definition at line 1305 of file TGraph.cxx.

Double_t TGraph::GetCovariance ( ) const

virtual

Return covariance of vectors x,y.

Definition at line 1317 of file TGraph.cxx.

Referenced by GetCorrelationFactor().

Bool_t TGraph::GetEditable

(

)

const

Return kTRUE if kNotEditable bit is not set, kFALSE otherwise.

Definition at line 2091 of file TGraph.cxx.

Double_t TGraph::GetErrorX ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1371 of file TGraph.cxx.

Double_t TGraph::GetErrorXhigh ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1390 of file TGraph.cxx.

Referenced by ROOT::Fit::DoFillData(), ROOT::Fit::GetDataType(), GraphFitChisquare(), GraphFitChisquareFumili(), and MultiGraphFitChisquare().

Double_t TGraph::GetErrorXlow ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1400 of file TGraph.cxx.

Referenced by ROOT::Fit::DoFillData(), ROOT::Fit::GetDataType(), GraphFitChisquare(), GraphFitChisquareFumili(), and MultiGraphFitChisquare().

Double_t TGraph::GetErrorY ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1380 of file TGraph.cxx.

Referenced by ROOT::Fit::DoFillData(), GraphFitChisquareFumili(), TLinearFitter::GraphLinearFitter(), and MultiGraphFitChisquare().

Double_t TGraph::GetErrorYhigh ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1410 of file TGraph.cxx.

Referenced by ROOT::Fit::DoFillData(), and GraphFitChisquare().

Double_t TGraph::GetErrorYlow ( Int_t  bin ) const

virtual

This function is called by GraphFitChisquare.

It always returns a negative value. Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 1420 of file TGraph.cxx.

Referenced by ROOT::Fit::DoFillData(), and GraphFitChisquare().

virtual Double_t* TGraph::GetEX ( ) const

inlinevirtual

Reimplemented in TGraphErrors.

Definition at line 141 of file TGraph.h.

Referenced by TGraphErrors::DoMerge(), ROOT::Fit::GetDataType(), TGraphErrors::Merge(), and TGraphPainter::PaintGraphErrors().

virtual Double_t* TGraph::GetEXhigh ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors, and TGraphAsymmErrors.

Definition at line 143 of file TGraph.h.

Referenced by TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), TGraphAsymmErrors::Merge(), TGraphPainter::PaintGraphAsymmErrors(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEXhighd ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 148 of file TGraph.h.

Referenced by TGraphBentErrors::DoMerge(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEXlow ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors, and TGraphAsymmErrors.

Definition at line 144 of file TGraph.h.

Referenced by TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), TGraphAsymmErrors::Merge(), TGraphPainter::PaintGraphAsymmErrors(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEXlowd ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 147 of file TGraph.h.

Referenced by TGraphBentErrors::DoMerge(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEY ( ) const

inlinevirtual

Reimplemented in TGraphErrors.

Definition at line 142 of file TGraph.h.

Referenced by TGraphErrors::DoMerge(), TFitter::GetConfidenceIntervals(), TLinearFitter::GetConfidenceIntervals(), ROOT::Fit::GetDataType(), TGraphErrors::Merge(), and TGraphPainter::PaintGraphErrors().

virtual Double_t* TGraph::GetEYhigh ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors, and TGraphAsymmErrors.

Definition at line 145 of file TGraph.h.

Referenced by TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), ROOT::Fit::GetDataType(), TGraphAsymmErrors::Merge(), TGraphPainter::PaintGraphAsymmErrors(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEYhighd ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 150 of file TGraph.h.

Referenced by TGraphBentErrors::DoMerge(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEYlow ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors, and TGraphAsymmErrors.

Definition at line 146 of file TGraph.h.

Referenced by TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), ROOT::Fit::GetDataType(), TGraphAsymmErrors::Merge(), TGraphPainter::PaintGraphAsymmErrors(), and TGraphPainter::PaintGraphBentErrors().

virtual Double_t* TGraph::GetEYlowd ( ) const

inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 149 of file TGraph.h.

Referenced by TGraphBentErrors::DoMerge(), and TGraphPainter::PaintGraphBentErrors().

TF1 * TGraph::GetFunction

(

const char *

name

)

const

Return pointer to function with name.

Functions such as TGraph::Fit store the fitted function in the list of functions of this graph.

Definition at line 1431 of file TGraph.cxx.

Referenced by doFit().

TH1F * TGraph::GetHistogram

(

)

const

Returns a pointer to the histogram used to draw the axis Takes into account the two following cases.

1. option 'A' was specified in TGraph::Draw. Return fHistogram
2. user had called TPad::DrawFrame. return pointer to hframe histogram

Definition at line 1443 of file TGraph.cxx.

Referenced by ApplicationWindow::ApplicationWindow(), TGraphPainter::DistancetoPrimitiveHelper(), RooStats::HypoTestInverterPlot::Draw(), TGraphPainter::ExecuteEventHelper(), TEfficiency::FillGraph(), HFit::GetDrawingRange(), GetXaxis(), GetYaxis(), TGraphPainter::PaintGraph(), TPad::RedrawAxis(), SetMaximum(), SetMinimum(), and stdsort().

TList* TGraph::GetListOfFunctions ( ) const

inline

Definition at line 126 of file TGraph.h.

Referenced by TGraphPainter::DistancetoPrimitiveHelper(), TGraphPainter::PaintGraph(), TGraphPainter::PaintGraphSimple(), TGraphPainter::PaintStats(), and UseCurrentStyle().

Double_t TGraph::GetMaximum ( ) const

inline

Definition at line 151 of file TGraph.h.

Referenced by TGraphPainter::PaintGraph().

Int_t TGraph::GetMaxSize ( ) const

inline

Definition at line 131 of file TGraph.h.

Double_t TGraph::GetMean ( Int_t  axis = 1 ) const

virtual

Return mean value of X (axis=1) or Y (axis=2)

Definition at line 1333 of file TGraph.cxx.

Double_t TGraph::GetMinimum ( ) const

inline

Definition at line 152 of file TGraph.h.

Referenced by GetHistogram(), and TGraphPainter::PaintGraph().

Int_t TGraph::GetN ( ) const

inline

Definition at line 132 of file TGraph.h.

Referenced by RooHist::addAsymmetryBin(), RooHist::addAsymmetryBinWithError(), RooHist::addBin(), RooHist::addBinWithError(), RooHist::addBinWithXYError(), RooHist::addEfficiencyBin(), RooHist::addEfficiencyBinWithError(), RooCurve::addPoint(), TGraphErrors::Apply(), TGraphAsymmErrors::Apply(), TGraphBentErrors::Apply(), TGraphSmooth::Approxin(), TCutG::Area(), TMVA::MethodBDT::BoostMonitor(), TGLH2PolyPainter::BuildTesselation(), TCutG::Center(), RooCurve::chiSquare(), ClassImp(), TBackCompFitter::Contour(), TTreeFormula::DefinedVariable(), TGraphPainter::DistancetoPrimitiveHelper(), ROOT::Fit::DoFillData(), TGraphErrors::DoMerge(), TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), DoMerge(), TProofProgressMemoryPlot::DoPlot(), TGLH2PolyPainter::DrawExtrusion(), TGraphPainter::ExecuteEventHelper(), TTreePerfStats::FileReadEvent(), TEfficiency::FillGraph(), RooCurve::findPoint(), TTreePerfStats::Finish(), RooStats::HistFactory::FitModelAndPlot(), TH2PolyBin::GetArea(), TFitter::GetConfidenceIntervals(), TLinearFitter::GetConfidenceIntervals(), RooStats::HypoTestInverterResult::GetExpectedLimit(), RooHist::getFitRangeNEvt(), RooStats::HypoTestInverterResult::GetLimitDistribution(), TH2PolyBin::GetXMax(), TH2PolyBin::GetXMin(), TH2PolyBin::GetYMax(), TH2PolyBin::GetYMin(), GraphFitChisquare(), GraphFitChisquareFumili(), TLinearFitter::GraphLinearFitter(), RooHist::hasIdenticalBinning(), TMultiGraph::InitGaus(), TCutG::IntegralHist(), RooCurve::interpolate(), RooCurve::isIdentical(), RooHist::isIdentical(), TH2Poly::IsIntersecting(), TMultiGraph::LeastSquareFit(), TMultiGraph::LeastSquareLinearFit(), RooCurve::makeErrorBand(), RooHist::makeResidHist(), TGraphErrors::Merge(), TGraphAsymmErrors::Merge(), Merge(), MultiGraphFitChisquare(), operator=(), TMultiGraph::Paint(), TTreePerfStats::Paint(), TGraphPainter::PaintGraph(), TGraphPainter::PaintGraphAsymmErrors(), TGraphPainter::PaintGraphBentErrors(), TGraphPainter::PaintGraphErrors(), TGraphPainter::PaintGraphPolar(), TGraphPainter::PaintGraphSimple(), TMultiGraph::PaintPolyLine3D(), TCreatePrimitives::PolyLine(), RooCurve::printMultiline(), RooHist::printMultiline(), RooCurve::RooCurve(), RooHist::RooHist(), TTreePerfStats::SavePrimitive(), TBackCompFitter::Scan(), TMinuitMinimizer::Scan(), RooCurve::shiftCurveToZero(), TGraphSmooth::Smoothin(), Sort(), TSelectorDraw::TakeAction(), TProofDrawListOfGraphs::Terminate(), testHisto1DFit(), and TGraph().

Int_t TGraph::GetPoint ( Int_t  i, Double_t &  x, Double_t &  y  ) const

virtual

Get x and y values for point number i.

The function returns -1 in case of an invalid request or the point number otherwise

Definition at line 1551 of file TGraph.cxx.

Referenced by TGraphErrors::Apply(), TGraphAsymmErrors::Apply(), TGraphBentErrors::Apply(), RooCurve::average(), RooCurve::chiSquare(), CompareArg(), DoMerge(), RooHist::getFitRangeNEvt(), RooHist::hasIdenticalBinning(), RooCurve::interpolate(), RooHist::makeResidHist(), TCreatePrimitives::PolyLine(), RooCurve::RooCurve(), RooHist::RooHist(), RooCurve::shiftCurveToZero(), TSpline3::TSpline3(), and TSpline5::TSpline5().

Double_t TGraph::GetRMS ( Int_t  axis = 1 ) const

virtual

Return RMS of X (axis=1) or Y (axis=2)

Definition at line 1348 of file TGraph.cxx.

Referenced by GetCorrelationFactor().

Double_t* TGraph::GetX ( ) const

inline

Definition at line 139 of file TGraph.h.

Referenced by TGraphSmooth::Approx(), TGraphSmooth::Approxin(), TGLH2PolyPainter::BuildTesselation(), RooCurve::calcBandInterval(), ClassImp(), TBackCompFitter::Contour(), TTreeFormula::DefinedVariable(), TGraphPainter::DistancetoPrimitiveHelper(), ROOT::Fit::DoFillData(), TGraphErrors::DoMerge(), TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), RooStats::LikelihoodIntervalPlot::Draw(), TGLH2PolyPainter::DrawExtrusion(), TGraphPainter::ExecuteEventHelper(), TEfficiency::FillGraph(), RooStats::HistFactory::FitModelAndPlot(), TFitter::GetConfidenceIntervals(), TLinearFitter::GetConfidenceIntervals(), TH2PolyBin::GetXMax(), TH2PolyBin::GetXMin(), GraphFitChisquare(), GraphFitChisquareFumili(), TLinearFitter::GraphLinearFitter(), TMultiGraph::InitGaus(), TH2Poly::IsIntersecting(), TMultiGraph::LeastSquareFit(), TMultiGraph::LeastSquareLinearFit(), RooCurve::makeErrorBand(), TGraphErrors::Merge(), TGraphAsymmErrors::Merge(), MultiGraphFitChisquare(), TTreePerfStats::Paint(), TGraphPainter::PaintGraphAsymmErrors(), TGraphPainter::PaintGraphBentErrors(), TGraphPainter::PaintGraphErrors(), TGraphPainter::PaintGraphPolar(), TGraphPainter::PaintGraphQQ(), TGraphPainter::PaintGraphSimple(), TMultiGraph::PaintPolyLine3D(), TTreePerfStats::SavePrimitive(), TBackCompFitter::Scan(), TMinuitMinimizer::Scan(), TGraphSmooth::Smoothin(), TGraphSmooth::SmoothKern(), TGraphSmooth::SmoothLowess(), TGraphSmooth::SmoothSuper(), and unuranGraf().

TAxis * TGraph::GetXaxis

(

)

const

Get x axis of the graph.

Definition at line 1563 of file TGraph.cxx.

Referenced by binarySearchTime(), TProofProgressDialog::DoPlotRateGraph(), RooStats::HypoTestInverterPlot::Draw(), RooStats::MCMCIntervalPlot::DrawChainScatter(), TAdvancedGraphicsDialog::DrawContour(), DrawData(), RooStats::MCMCIntervalPlot::DrawNLLVsTime(), RooStats::MCMCIntervalPlot::DrawParameterVsTime(), TAdvancedGraphicsDialog::DrawScan(), TEfficiency::FillGraph(), GetHistogram(), RooStats::ProfileInspector::GetListOfProfilePlots(), TTreePerfStats::Paint(), and TGraphPainter::PaintGraphQQ().

Double_t* TGraph::GetY ( ) const

inline

Definition at line 140 of file TGraph.h.

Referenced by TGraphSmooth::Approx(), TGraphSmooth::Approxin(), TGLH2PolyPainter::BuildTesselation(), RooCurve::calcBandInterval(), TBackCompFitter::Contour(), TGraphPainter::DistancetoPrimitiveHelper(), ROOT::Fit::DoFillData(), TGraphErrors::DoMerge(), TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), RooStats::LikelihoodIntervalPlot::Draw(), TGLH2PolyPainter::DrawExtrusion(), TGraphPainter::ExecuteEventHelper(), TEfficiency::FillGraph(), TTreePerfStats::Finish(), TH2PolyBin::GetYMax(), TH2PolyBin::GetYMin(), GraphFitChisquare(), GraphFitChisquareFumili(), TLinearFitter::GraphLinearFitter(), TMultiGraph::InitGaus(), RooHist::isIdentical(), TH2Poly::IsIntersecting(), TMultiGraph::LeastSquareFit(), TMultiGraph::LeastSquareLinearFit(), TGraphErrors::Merge(), TGraphAsymmErrors::Merge(), MultiGraphFitChisquare(), TTreePerfStats::Paint(), TGraphPainter::PaintGraphAsymmErrors(), TGraphPainter::PaintGraphBentErrors(), TGraphPainter::PaintGraphErrors(), TGraphPainter::PaintGraphPolar(), TGraphPainter::PaintGraphSimple(), TMultiGraph::PaintPolyLine3D(), TTreePerfStats::SavePrimitive(), TBackCompFitter::Scan(), TMinuitMinimizer::Scan(), TGraphSmooth::Smoothin(), TGraphSmooth::SmoothKern(), TGraphSmooth::SmoothLowess(), TGraphSmooth::SmoothSuper(), TMultiLayerPerceptron::Train(), and unuranGraf().

TAxis * TGraph::GetYaxis

(

)

const

Get y axis of the graph.

Definition at line 1573 of file TGraph.cxx.

Referenced by binarySearchTime(), RooStats::HypoTestInverterPlot::Draw(), RooStats::MCMCIntervalPlot::DrawChainScatter(), TAdvancedGraphicsDialog::DrawContour(), DrawData(), RooStats::MCMCIntervalPlot::DrawNLLVsTime(), RooStats::MCMCIntervalPlot::DrawParameterVsTime(), TAdvancedGraphicsDialog::DrawScan(), TEfficiency::FillGraph(), RooStats::ProfileInspector::GetListOfProfilePlots(), TTreePerfStats::Paint(), TGraphPainter::PaintGraphQQ(), RooHist::RooHist(), and testInterpolation().

void TGraph::InitExpo ( Double_t  xmin = 0, Double_t  xmax = 0  )

virtual

Compute Initial values of parameters for an exponential.

Definition at line 1621 of file TGraph.cxx.

void TGraph::InitGaus ( Double_t  xmin = 0, Double_t  xmax = 0  )

virtual

Compute Initial values of parameters for a gaussian.

Definition at line 1583 of file TGraph.cxx.

void TGraph::InitPolynom ( Double_t  xmin = 0, Double_t  xmax = 0  )

virtual

Compute Initial values of parameters for a polynom.

Definition at line 1642 of file TGraph.cxx.

Int_t TGraph::InsertPoint ( )

virtual

Insert a new point at the mouse position.

Definition at line 1662 of file TGraph.cxx.

Double_t TGraph::Integral ( Int_t  first = 0, Int_t  last = -1  ) const

virtual

Integrate the TGraph data within a given (index) range.

Note that this function computes the area of the polygon enclosed by the points of the TGraph. The polygon segments, which are defined by the points of the TGraph, do not need to form a closed polygon, since the last polygon segment, which closes the polygon, is taken as the line connecting the last TGraph point with the first one. It is clear that the order of the point is essential in defining the polygon. Also note that the segments should not intersect.

NB:

• if last=-1 (default) last is set to the last point.
• if (first <0) the first point (0) is taken.

Method:

There are many ways to calculate the surface of a polygon. It all depends on what kind of data you have to deal with. The most evident solution would be to divide the polygon in triangles and calculate the surface of them. But this can quickly become complicated as you will have to test every segments of every triangles and check if they are intersecting with a current polygon's segment or if it goes outside the polygon. Many calculations that would lead to many problems...

The solution (implemented by R.Brun)

Fortunately for us, there is a simple way to solve this problem, as long as the polygon's segments don't intersect. It takes the x coordinate of the current vertex and multiply it by the y coordinate of the next vertex. Then it subtracts from it the result of the y coordinate of the current vertex multiplied by the x coordinate of the next vertex. Then divide the result by 2 to get the surface/area.

Sources

• http://forums.wolfram.com/mathgroup/archive/1998/Mar/msg00462.html
• http://stackoverflow.com/questions/451426/how-do-i-calculate-the-surface-area-of-a-2d-polygon

Definition at line 1738 of file TGraph.cxx.

Referenced by TH2PolyBin::GetArea().

virtual Bool_t TGraph::IsEditable ( ) const

inlinevirtual

Definition at line 162 of file TGraph.h.

Referenced by TGraphPainter::ExecuteEventHelper().

Int_t TGraph::IsInside ( Double_t  x, Double_t  y  ) const

virtual

Return 1 if the point (x,y) is inside the polygon defined by the graph vertices 0 otherwise.

Algorithm:

The loop is executed with the end-point coordinates of a line segment (X1,Y1)-(X2,Y2) and the Y-coordinate of a horizontal line. The counter inter is incremented if the line (X1,Y1)-(X2,Y2) intersects the horizontal line. In this case XINT is set to the X-coordinate of the intersection point. If inter is an odd number, then the point x,y is within the polygon.

Definition at line 1771 of file TGraph.cxx.

Referenced by TTreeFormula::EvalInstance(), TCutG::IntegralHist(), TH2PolyBin::IsInside(), TMultiGraph::IsInside(), and THistPainter::PaintTH2PolyScatterPlot().

void TGraph::LeastSquareFit ( Int_t  m, Double_t *  a, Double_t  xmin = 0, Double_t  xmax = 0  )

virtual

Least squares polynomial fitting without weights.

Parameters

[in]	m	number of parameters
[in]	ma	array of parameters
[in]	mfirst	1st point number to fit (default =0)
[in]	mlast	last point number to fit (default=fNpoints-1)

based on CERNLIB routine LSQ: Translated to C++ by Rene Brun

Definition at line 1786 of file TGraph.cxx.

Referenced by InitPolynom().

void TGraph::LeastSquareLinearFit ( Int_t  ndata, Double_t &  a0, Double_t &  a1, Int_t &  ifail, Double_t  xmin = 0, Double_t  xmax = 0  )

virtual

Least square linear fit without weights.

Fit a straight line (a0 + a1*x) to the data in this graph.

Parameters

[in]	ndata	if ndata<0, fits the logarithm of the graph (used in InitExpo() to set the initial parameter values for a fit with exponential function.
[in]	a0	constant
[in]	a1	slope
[in]	ifail	return parameter indicating the status of the fit (ifail=0, fit is OK)
[in]	xmin,xmax	fitting range

extracted from CERNLIB LLSQ: Translated to C++ by Rene Brun

Definition at line 1861 of file TGraph.cxx.

Referenced by InitExpo(), and LeastSquareFit().

Int_t TGraph::Merge ( TCollection *  li )

virtual

Adds all graphs from the collection to this graph.

Returns the total number of poins in the result or -1 in case of an error.

Reimplemented in TGraphAsymmErrors, and TGraphErrors.

Definition at line 2351 of file TGraph.cxx.

TGraph & TGraph::operator=

(

const TGraph &

gr

)

Equal operator for this graph.

Definition at line 180 of file TGraph.cxx.

Referenced by TCutG::operator=(), TGraphErrors::operator=(), and TGraphAsymmErrors::operator=().

void TGraph::Paint ( Option_t *  chopt = "" )

virtual

Draw this graph with its current attributes.

Reimplemented from TObject.

Definition at line 1907 of file TGraph.cxx.

Referenced by TSpline::Paint(), TTreePerfStats::Paint(), TEfficiency::Paint(), TGraph2DPainter::PaintContour(), THistPainter::PaintTH2PolyBins(), and THistPainter::PaintTH2PolyColorLevels().

void TGraph::PaintGraph	(	Int_t	npoints,
		const Double_t *	x,
		const Double_t *	y,
		Option_t *	chopt
	)

Draw the (x,y) as a graph.

Definition at line 1916 of file TGraph.cxx.

Referenced by TGraphEdge::Paint(), TParallelCoord::PaintEntries(), THistPainter::PaintErrors(), and TColorWheel::PaintRectangles().

void TGraph::PaintGrapHist	(	Int_t	npoints,
		const Double_t *	x,
		const Double_t *	y,
		Option_t *	chopt
	)

Draw the (x,y) as a histogram.

Definition at line 1925 of file TGraph.cxx.

Referenced by THistPainter::PaintHist().

void TGraph::PaintStats ( TF1 *  fit )

virtual

Draw the stats.

Definition at line 1934 of file TGraph.cxx.

Referenced by TMultiGraph::Paint(), and TEfficiency::Paint().

void TGraph::Print ( Option_t *  chopt = "" ) const

virtual

Print graph values.

Reimplemented from TNamed.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, TGraphErrors, RooHist, RooCurve, and RooEllipse.

Definition at line 1943 of file TGraph.cxx.

Referenced by TMultiGraph::Print().

void TGraph::RecursiveRemove ( TObject *  obj )

virtual

Recursively remove object from the list of functions.

Reimplemented from TObject.

Definition at line 1953 of file TGraph.cxx.

Int_t TGraph::RemovePoint ( )

virtual

Delete point close to the mouse position.

Definition at line 1964 of file TGraph.cxx.

Referenced by RooStats::LikelihoodIntervalPlot::Draw().

Int_t TGraph::RemovePoint ( Int_t  ipoint )

virtual

Delete point number ipoint.

Definition at line 1987 of file TGraph.cxx.

void TGraph::SavePrimitive ( std::ostream &  out, Option_t *  option = ""  )

virtual

Save primitive as a C++ statement(s) on output stream out.

Reimplemented from TObject.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, TGraphErrors, and TCutG.

Definition at line 2001 of file TGraph.cxx.

void TGraph::Set ( Int_t  n )

virtual

Set number of points in the graph Existing coordinates are preserved New coordinates above fNpoints are preset to 0.

Definition at line 2076 of file TGraph.cxx.

Referenced by TGraphSmooth::Approxin(), TMVA::MethodBDT::BoostMonitor(), TBackCompFitter::Contour(), TGraphAsymmErrors::Divide(), TEfficiency::FillGraph(), ROOT::Fit::GetConfidenceIntervals(), TGraphErrors::Merge(), TGraphAsymmErrors::Merge(), TCreatePrimitives::PolyLine(), TBackCompFitter::Scan(), TGraph(), and TGraphErrors::TGraphErrors().

void TGraph::SetEditable ( Bool_t  editable = kTRUE )

virtual

if editable=kFALSE, the graph cannot be modified with the mouse by default a TGraph is editable

Definition at line 2100 of file TGraph.cxx.

Referenced by TSelectorDraw::TakeAction(), TSelectorDraw::TakeEstimate(), and TGraphPolar::TGraphPolar().

virtual void TGraph::SetHistogram ( TH1F *  h )

inlinevirtual

Definition at line 177 of file TGraph.h.

Referenced by TProofProgressDialog::DoPlotRateGraph(), TProofBench::DrawCPU(), TProofBench::DrawDataSet(), TProofBench::DrawEfficiency(), and TGraphPainter::PaintGraph().

void TGraph::SetMaximum ( Double_t  maximum = -1111 )

virtual

Set the maximum of the graph.

Reimplemented in TGraphPolar.

Definition at line 2109 of file TGraph.cxx.

Referenced by TProofProgressDialog::DoPlotRateGraph().

void TGraph::SetMinimum ( Double_t  minimum = -1111 )

virtual

Set the minimum of the graph.

Reimplemented in TGraphPolar.

Definition at line 2118 of file TGraph.cxx.

Referenced by TProofProgressDialog::DoPlotRateGraph().

void TGraph::SetPoint ( Int_t  i, Double_t  x, Double_t  y  )

virtual

Set x and y values for point number i.

Definition at line 2127 of file TGraph.cxx.

Referenced by RooHist::addAsymmetryBin(), RooHist::addAsymmetryBinWithError(), RooHist::addBin(), RooHist::addBinWithError(), RooHist::addBinWithXYError(), RooHist::addEfficiencyBin(), RooHist::addEfficiencyBinWithError(), RooCurve::addPoint(), TGraphErrors::Apply(), TGraphAsymmErrors::Apply(), TGraphBentErrors::Apply(), TGraphSmooth::Approx(), TGraphSmooth::Approxin(), TMVA::MethodBDT::BoostMonitor(), THbookFile::Convert1D(), TGraphAsymmErrors::Divide(), TProofProgressMemoryPlot::DoAveragePlot(), TProofProgressMemoryPlot::DoMasterPlot(), TGraphErrors::DoMerge(), TGraphAsymmErrors::DoMerge(), TGraphBentErrors::DoMerge(), DoMerge(), TProofProgressDialog::DoPlotRateGraph(), TProofProgressMemoryPlot::DoWorkerPlot(), RooStats::LikelihoodIntervalPlot::Draw(), TAdvancedGraphicsDialog::DrawConfidenceLevels(), ErrorBand(), TTreePerfStats::FileReadEvent(), TEfficiency::FillGraph(), TFitter::GetConfidenceIntervals(), TBackCompFitter::GetConfidenceIntervals(), ROOT::Fit::GetConfidenceIntervals(), TLinearFitter::GetConfidenceIntervals(), TGraph2DPainter::GetContourList(), TMVA::MethodCuts::GetEfficiency(), RooStats::HypoTestInverterResult::GetExpectedLimit(), TProofBench::GetGraph(), RooStats::HypoTestInverterResult::GetLimitDistribution(), RooStats::HypoTestInverterPlot::MakeExpectedPlot(), TGraphErrors::Merge(), TGraphAsymmErrors::Merge(), piRandom(), TCreatePrimitives::PolyLine(), TGraphErrors::SetPointError(), TGraphAsymmErrors::SetPointError(), TGraphBentErrors::SetPointError(), TGraphAsymmErrors::SetPointEXhigh(), TGraphAsymmErrors::SetPointEXlow(), TGraphAsymmErrors::SetPointEYhigh(), TGraphAsymmErrors::SetPointEYlow(), RooCurve::shiftCurveToZero(), TGraphSmooth::Smoothin(), TGraphSmooth::SmoothKern(), TGraphSmooth::SmoothLowess(), TGraphSmooth::SmoothSuper(), TSelectorDraw::TakeAction(), TProofDrawListOfGraphs::Terminate(), TestSpeed(), TGraph(), TGraphErrors::TGraphErrors(), TMultiLayerPerceptron::Train(), and unuranGraf().

void TGraph::SetTitle ( const char *  title = "" )

virtual

Set graph title.

Reimplemented from TNamed.

Definition at line 2153 of file TGraph.cxx.

Referenced by ApplicationWindow::ApplicationWindow(), binarySearchTime(), TProofProgressDialog::DoPlotRateGraph(), TGraphEditor::DoTitle(), RooStats::MCMCIntervalPlot::DrawChainScatter(), TAdvancedGraphicsDialog::DrawConfidenceLevels(), DrawData(), DrawFunction(), RooStats::MCMCIntervalPlot::DrawNLLVsTime(), RooStats::MCMCIntervalPlot::DrawParameterVsTime(), TGeoPainter::DrawPolygon(), TEfficiency::FillGraph(), TKDE::GetGraphWithErrors(), RooStats::ProfileInspector::GetListOfProfilePlots(), RooStats::HypoTestInverterPlot::MakeExpectedPlot(), RooStats::HypoTestInverterPlot::MakePlot(), RooHist::makeResidHist(), RooCurve::RooCurve(), RooHist::RooHist(), stdsort(), testPermute(), TGraph(), TGraphAsymmErrors::TGraphAsymmErrors(), TMVA::MethodBDT::Train(), and TTreePerfStats::TTreePerfStats().

Double_t ** TGraph::ShrinkAndCopy ( Int_t  size, Int_t  oend  )

protected

if size*2 <= fMaxSize allocate new arrays of size points, copy points [0,oend).

Return newarray (passed or new instance if it was zero and allocations are needed)

Definition at line 2165 of file TGraph.cxx.

Referenced by RemovePoint().

void TGraph::Sort ( Bool_t(*)(const TGraph *, Int_t, Int_t)  greaterfunc = &TGraph::CompareX, Bool_t  ascending = kTRUE, Int_t  low = 0, Int_t  high = -1111  )

virtual

Sorts the points of this TGraph using in-place quicksort (see e.g.

older glibc). To compare two points the function parameter greaterfunc is used (see TGraph::CompareX for an example of such a method, which is also the default comparison function for Sort). After the sort, greaterfunc(this, i, j) will return kTRUE for all i>j if ascending == kTRUE, and kFALSE otherwise.

The last two parameters are used for the recursive quick sort, stating the range to be sorted

Examples:

// sort points along x axis
graph->Sort();
// sort points along their distance to origin
graph->Sort(&TGraph::CompareRadius);

Bool_t CompareErrors(const TGraph* gr, Int_t i, Int_t j) {
  const TGraphErrors* ge=(const TGraphErrors*)gr;
  return (ge->GetEY()[i]>ge->GetEY()[j]); }
// sort using the above comparison function, largest errors first
graph->Sort(&CompareErrors, kFALSE);

Definition at line 2198 of file TGraph.cxx.

void TGraph::SwapPoints ( Int_t  pos1, Int_t  pos2  )

protectedvirtual

Swap points.

Reimplemented in TGraphBentErrors, TGraphAsymmErrors, and TGraphErrors.

Definition at line 2295 of file TGraph.cxx.

Referenced by Sort(), TGraphErrors::SwapPoints(), TGraphAsymmErrors::SwapPoints(), and TGraphBentErrors::SwapPoints().

void TGraph::SwapValues ( Double_t *  arr, Int_t  pos1, Int_t  pos2  )

staticprotected

Swap values.

Definition at line 2304 of file TGraph.cxx.

Referenced by TGraphErrors::SwapPoints(), TGraphAsymmErrors::SwapPoints(), TGraphBentErrors::SwapPoints(), and SwapPoints().

void TGraph::UseCurrentStyle ( )

virtual

Set current style settings in this graph This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.

Reimplemented from TObject.

Definition at line 2316 of file TGraph.cxx.

void TGraph::Zero	(	Int_t &	k,
		Double_t	AZ,
		Double_t	BZ,
		Double_t	E2,
		Double_t &	X,
		Double_t &	Y,
		Int_t	maxiterations
	)

Find zero of a continuous function.

This function finds a real zero of the continuous real function Y(X) in a given interval (A,B). See accompanying notes for details of the argument list and calling sequence

Definition at line 2383 of file TGraph.cxx.

Referenced by TGraphPainter::Smooth().

Member Data Documentation

TList* TGraph::fFunctions

protected

Definition at line 61 of file TGraph.h.

Referenced by CtorAllocate(), FindObject(), GetFunction(), GetListOfFunctions(), operator=(), RecursiveRemove(), TGraphErrors::SavePrimitive(), TGraphAsymmErrors::SavePrimitive(), TGraphBentErrors::SavePrimitive(), SavePrimitive(), TGraph(), and ~TGraph().

TH1F* TGraph::fHistogram

protected

Definition at line 62 of file TGraph.h.

Referenced by TGraphErrors::Apply(), TGraphAsymmErrors::Apply(), TGraphBentErrors::Apply(), Apply(), CtorAllocate(), GetHistogram(), operator=(), RecursiveRemove(), TGraphErrors::SavePrimitive(), TGraphAsymmErrors::SavePrimitive(), TGraphBentErrors::SavePrimitive(), SavePrimitive(), SetPoint(), SetTitle(), TGraph(), and ~TGraph().

Double_t TGraph::fMaximum

protected

Definition at line 64 of file TGraph.h.

Referenced by CtorAllocate(), GetHistogram(), GetMaximum(), operator=(), SetMaximum(), and TGraph().

Int_t TGraph::fMaxSize

protected

Definition at line 57 of file TGraph.h.

Referenced by AllocateArrays(), TGraphErrors::CtorAllocate(), TGraphAsymmErrors::CtorAllocate(), TGraphBentErrors::CtorAllocate(), CtorAllocate(), Expand(), ExpandAndCopy(), GetMaxSize(), operator=(), SetPoint(), ShrinkAndCopy(), and TGraph().

Double_t TGraph::fMinimum

protected

Definition at line 63 of file TGraph.h.

Referenced by CtorAllocate(), GetHistogram(), GetMinimum(), operator=(), SetMinimum(), and TGraph().

Int_t TGraph::fNpoints

protected

Current dimension of arrays fX and fY.

Definition at line 58 of file TGraph.h.

Referenced by Apply(), TGraphErrors::ComputeRange(), TGraphAsymmErrors::ComputeRange(), TGraphBentErrors::ComputeRange(), ComputeRange(), TGraphErrors::CtorAllocate(), TGraphAsymmErrors::CtorAllocate(), TGraphBentErrors::CtorAllocate(), CtorAllocate(), Eval(), Expand(), GetCovariance(), TGraphErrors::GetErrorX(), TGraphAsymmErrors::GetErrorX(), TGraphBentErrors::GetErrorX(), TGraphErrors::GetErrorXhigh(), TGraphAsymmErrors::GetErrorXhigh(), TGraphBentErrors::GetErrorXhigh(), TGraphErrors::GetErrorXlow(), TGraphAsymmErrors::GetErrorXlow(), TGraphBentErrors::GetErrorXlow(), TGraphErrors::GetErrorY(), TGraphAsymmErrors::GetErrorY(), TGraphBentErrors::GetErrorY(), TGraphErrors::GetErrorYhigh(), TGraphAsymmErrors::GetErrorYhigh(), TGraphBentErrors::GetErrorYhigh(), TGraphErrors::GetErrorYlow(), TGraphAsymmErrors::GetErrorYlow(), TGraphBentErrors::GetErrorYlow(), GetHistogram(), GetMean(), GetN(), GetPoint(), GetRMS(), TGraphPolar::GetXpol(), TGraphPolar::GetYpol(), InitExpo(), InitGaus(), InitPolynom(), InsertPoint(), Integral(), IsInside(), LeastSquareFit(), LeastSquareLinearFit(), TGraphQQ::MakeFunctionQuantiles(), TGraphQQ::MakeQuantiles(), TGraphErrors::operator=(), TGraphAsymmErrors::operator=(), operator=(), TGraphErrors::Print(), TGraphAsymmErrors::Print(), TGraphBentErrors::Print(), Print(), TGraphQQ::Quartiles(), RemovePoint(), TCutG::SavePrimitive(), TGraphErrors::SavePrimitive(), TGraphAsymmErrors::SavePrimitive(), TGraphBentErrors::SavePrimitive(), SavePrimitive(), Set(), SetPoint(), TGraphErrors::SetPointError(), TGraphAsymmErrors::SetPointError(), TGraphBentErrors::SetPointError(), TGraphAsymmErrors::SetPointEXhigh(), TGraphAsymmErrors::SetPointEXlow(), TGraphAsymmErrors::SetPointEYhigh(), TGraphAsymmErrors::SetPointEYlow(), TGraph(), TGraphAsymmErrors::TGraphAsymmErrors(), TGraphBentErrors::TGraphBentErrors(), TGraphErrors::TGraphErrors(), and TGraphQQ::TGraphQQ().

Double_t* TGraph::fX

protected

Definition at line 59 of file TGraph.h.

Referenced by Apply(), TCutG::Area(), TCutG::Center(), CompareRadius(), CompareX(), TGraphErrors::ComputeRange(), TGraphAsymmErrors::ComputeRange(), TGraphBentErrors::ComputeRange(), ComputeRange(), TGraphErrors::CopyAndRelease(), TGraphAsymmErrors::CopyAndRelease(), TGraphBentErrors::CopyAndRelease(), CopyAndRelease(), CopyPoints(), CtorAllocate(), DrawGraph(), Eval(), FillZero(), GetCovariance(), GetMean(), GetPoint(), GetRMS(), GetX(), InitExpo(), InitGaus(), InitPolynom(), InsertPoint(), Integral(), TCutG::IntegralHist(), RooCurve::isIdentical(), IsInside(), LeastSquareFit(), LeastSquareLinearFit(), TGraphQQ::MakeFunctionQuantiles(), TGraphQQ::MakeQuantiles(), operator=(), TGraphErrors::Print(), TGraphAsymmErrors::Print(), TGraphBentErrors::Print(), Print(), RooCurve::printMultiline(), RooHist::printMultiline(), TGraphQQ::Quartiles(), RemovePoint(), TCutG::SavePrimitive(), TGraphErrors::SavePrimitive(), TGraphAsymmErrors::SavePrimitive(), TGraphBentErrors::SavePrimitive(), SavePrimitive(), SetPoint(), TGraphErrors::SetPointError(), TGraphAsymmErrors::SetPointError(), TGraphBentErrors::SetPointError(), SwapPoints(), TGraph(), TGraphAsymmErrors::TGraphAsymmErrors(), TGraphQQ::TGraphQQ(), and ~TGraph().

Double_t* TGraph::fY

protected

Definition at line 60 of file TGraph.h.

Referenced by Apply(), TCutG::Area(), TCutG::Center(), CompareRadius(), CompareY(), TGraphErrors::ComputeRange(), TGraphAsymmErrors::ComputeRange(), TGraphBentErrors::ComputeRange(), ComputeRange(), TGraphErrors::CopyAndRelease(), TGraphAsymmErrors::CopyAndRelease(), TGraphBentErrors::CopyAndRelease(), CopyAndRelease(), CopyPoints(), CtorAllocate(), DrawGraph(), Eval(), FillZero(), GetCovariance(), GetMean(), GetPoint(), GetRMS(), GetY(), InitGaus(), InsertPoint(), Integral(), TCutG::IntegralHist(), RooCurve::isIdentical(), IsInside(), LeastSquareFit(), LeastSquareLinearFit(), operator=(), TGraphErrors::Print(), TGraphAsymmErrors::Print(), TGraphBentErrors::Print(), Print(), RooCurve::printMultiline(), RooHist::printMultiline(), TGraphQQ::Quartiles(), RemovePoint(), TCutG::SavePrimitive(), TGraphErrors::SavePrimitive(), TGraphAsymmErrors::SavePrimitive(), TGraphBentErrors::SavePrimitive(), SavePrimitive(), SetPoint(), TGraphErrors::SetPointError(), TGraphAsymmErrors::SetPointError(), TGraphBentErrors::SetPointError(), SwapPoints(), TGraph(), TGraphAsymmErrors::TGraphAsymmErrors(), TGraphQQ::TGraphQQ(), and ~TGraph().

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The documentation for this class was generated from the following files:

• hist/hist/inc/TGraph.h
• hist/hist/src/TGraph.cxx