A TGraphErrors is a TGraph with error bars.

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

The picture below gives an example:

{
   c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,500);
   c1->SetFillColor(42);
   c1->SetGrid();
   c1->GetFrame()->SetFillColor(21);
   c1->GetFrame()->SetBorderSize(12);
   const Int_t n = 10;
   Double_t x[n]  = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
   Double_t y[n]  = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
   Double_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
   Double_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
   gr = new TGraphErrors(n,x,y,ex,ey);
   gr->SetTitle("TGraphErrors Example");
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(21);
   gr->Draw("ALP");
   return c1;
}

Definition at line 28 of file TGraphErrors.h.

Public Member Functions
	TGraphErrors ()

	TGraphErrors (Int_t n)
	TGraphErrors normal constructor. More...

	TGraphErrors (Int_t n, const Float_t x, const Float_t y, const Float_t ex=0, const Float_t ey=0)
	TGraphErrors normal constructor. More...

	TGraphErrors (Int_t n, const Double_t x, const Double_t y, const Double_t ex=0, const Double_t ey=0)
	TGraphErrors normal constructor. More...

	TGraphErrors (const TVectorF &vx, const TVectorF &vy, const TVectorF &vex, const TVectorF &vey)
	constructor with four vectors of floats in input A grapherrors is built with the X coordinates taken from vx and Y coord from vy and the errors from vectors vex and vey. More...

	TGraphErrors (const TVectorD &vx, const TVectorD &vy, const TVectorD &vex, const TVectorD &vey)
	constructor with four vectors of doubles in input A grapherrors is built with the X coordinates taken from vx and Y coord from vy and the errors from vectors vex and vey. More...

	TGraphErrors (const TGraphErrors &gr)
	TGraphErrors copy constructor. More...

TGraphErrors &	operator= (const TGraphErrors &gr)
	TGraphErrors assignment operator. More...

	TGraphErrors (const TH1 *h)
	TGraphErrors constructor importing its parameters from the TH1 object passed as argument. More...

	TGraphErrors (const char filename, const char format="%lg %lg %lg %lg", Option_t *option="")
	GraphErrors constructor reading input from filename filename is assumed to contain at least 3 columns of numbers convention for format (default="%lg %lg %lg %lg) format = "lg lg" read only 2 first columns into X,Y format = "lg lg lg" read only 3 first columns into X,Y and EY format = "lg lg lg lg" read only 4 first columns into X,Y,EX,EY. More...

virtual	~TGraphErrors ()
	TGraphErrors default destructor. More...

virtual void	Apply (TF1 *f)
	apply function to all the data points y = f(x,y) More...

virtual void	ComputeRange (Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax) const
	Compute range. More...

Double_t	GetErrorX (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t	GetErrorY (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t	GetErrorXhigh (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t	GetErrorXlow (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t	GetErrorYhigh (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t	GetErrorYlow (Int_t bin) const
	This function is called by GraphFitChisquare. More...

Double_t *	GetEX () const

Double_t *	GetEY () const

virtual Int_t	Merge (TCollection *list)
	Adds all graphs with errors from the collection to this graph. More...

virtual void	Print (Option_t *chopt="") const
	Print graph and errors values. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save primitive as a C++ statement(s) on output stream out. More...

virtual void	SetPointError (Double_t ex, Double_t ey)
	Set ex and ey values for point pointed by the mouse. More...

virtual void	SetPointError (Int_t i, Double_t ex, Double_t ey)
	Set ex and ey values for point number i. More...

Public Member Functions inherited from TGraph
	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	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 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

Double_t *	GetX () const

Double_t *	GetY () 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 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	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	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 Int_t	CalculateScanfFields (const char *fmt)
	Calculate scan fields. More...

Static Public Member Functions inherited from TGraph
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 size)

virtual void	CopyAndRelease (Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
	Copy and release. More...

virtual Bool_t	CopyPoints (Double_t **arrays, Int_t ibegin, Int_t iend, Int_t obegin)
	Copy errors from fEX and fEY to arrays[0] and arrays[1] or to fX and fY. More...

Bool_t	CtorAllocate ()
	Constructor allocate. 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]. More...

virtual Bool_t	DoMerge (const TGraph *g)
	protected function to perform the merge operation of a graph with errors More...

Protected Member Functions inherited from TGraph
Double_t **	AllocateArrays (Int_t Narrays, Int_t arraySize)
	Allocate arrays. 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...

Double_t **	ShrinkAndCopy (Int_t size, Int_t iend)
	if size*2 <= fMaxSize allocate new arrays of size points, copy points [0,oend). 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...

Protected Attributes
Double_t *	fEX

Double_t *	fEY

Protected Attributes inherited from TGraph
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

Additional Inherited Members
Public Types inherited from TGraph
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) }

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

#include <TGraphErrors.h>

Inheritance diagram for TGraphErrors:

[legend]

Constructor & Destructor Documentation

TGraphErrors::TGraphErrors ( )

TGraphErrors::TGraphErrors ( Int_t n )

TGraphErrors normal constructor.

the arrays are preset to zero

Definition at line 82 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors	(	Int_t	n,
		const Float_t *	x,
		const Float_t *	y,
		const Float_t *	ex = `0`,
		const Float_t *	ey = `0`
	)

TGraphErrors normal constructor.

if ex or ey are null, the corresponding arrays are preset to zero

Definition at line 95 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors	(	Int_t	n,
		const Double_t *	x,
		const Double_t *	y,
		const Double_t *	ex = `0`,
		const Double_t *	ey = `0`
	)

TGraphErrors normal constructor.

if ex or ey are null, the corresponding arrays are preset to zero

Definition at line 114 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors	(	const TVectorF &	vx,
		const TVectorF &	vy,
		const TVectorF &	vex,
		const TVectorF &	vey
	)

constructor with four vectors of floats in input A grapherrors is built with the X coordinates taken from vx and Y coord from vy and the errors from vectors vex and vey.

The number of points in the graph is the minimum of number of points in vx and vy.

Definition at line 134 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors	(	const TVectorD &	vx,
		const TVectorD &	vy,
		const TVectorD &	vex,
		const TVectorD &	vey
	)

constructor with four vectors of doubles in input A grapherrors is built with the X coordinates taken from vx and Y coord from vy and the errors from vectors vex and vey.

The number of points in the graph is the minimum of number of points in vx and vy.

Definition at line 154 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors ( const TGraphErrors & gr )

TGraphErrors copy constructor.

Definition at line 170 of file TGraphErrors.cxx.

TGraphErrors::TGraphErrors ( const TH1 * h )

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

Definition at line 204 of file TGraphErrors.cxx.

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

GraphErrors constructor reading input from filename filename is assumed to contain at least 3 columns of numbers convention for format (default="%lg %lg %lg %lg) format = "lg lg" read only 2 first columns into X,Y format = "lg lg lg" read only 3 first columns into X,Y and EY format = "lg lg lg lg" read only 4 first columns into X,Y,EX,EY.

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 instanciation is about 2 times slower. In case a delimiter is specified, the format "%lg %lg %lg" will read X,Y,EX.

Definition at line 231 of file TGraphErrors.cxx.

TGraphErrors::~TGraphErrors ( )

virtual

TGraphErrors default destructor.

Definition at line 365 of file TGraphErrors.cxx.

Member Function Documentation

Double_t ** TGraphErrors::Allocate ( Int_t size )

inlineprotectedvirtual

Reimplemented from TGraph.

Definition at line 79 of file TGraphErrors.h.

void TGraphErrors::Apply ( TF1 * f )

virtual

apply function to all the data points y = f(x,y)

The error is calculated as ey=(f(x,y+ey)-f(x,y-ey))/2 This is the same as error(fy) = df/dy * ey for small errors

For generic functions the symmetric errors might become non-symmetric and are averaged here. Use TGraphAsymmErrors if desired.

error on x doesn't change function suggested/implemented by Miroslav Helbich helbi.nosp@m.ch@m.nosp@m.ail.d.nosp@m.esy..nosp@m.de

Reimplemented from TGraph.

Definition at line 385 of file TGraphErrors.cxx.

Int_t TGraphErrors::CalculateScanfFields ( const char * fmt )

static

Calculate scan fields.

Definition at line 408 of file TGraphErrors.cxx.

Referenced by TGraphErrors().

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

virtual

Compute range.

Reimplemented from TGraph.

Definition at line 439 of file TGraphErrors.cxx.

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

protectedvirtual

Copy and release.

Reimplemented from TGraph.

Definition at line 469 of file TGraphErrors.cxx.

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

protectedvirtual

Copy errors from fEX and fEY to arrays[0] and arrays[1] or to fX and fY.

Copy points.

Reimplemented from TGraph.

Definition at line 491 of file TGraphErrors.cxx.

Referenced by CopyAndRelease().

Bool_t TGraphErrors::CtorAllocate ( void )

protected

Constructor allocate.

Note: This function should be called only from the constructor since it does not delete previously existing arrays

Definition at line 515 of file TGraphErrors.cxx.

Referenced by operator=(), and TGraphErrors().

Bool_t TGraphErrors::DoMerge ( const TGraph * g )

protectedvirtual

protected function to perform the merge operation of a graph with errors

Reimplemented from TGraph.

Definition at line 531 of file TGraphErrors.cxx.

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

protectedvirtual

Set zero values for point arrays in the range [begin, end].

Reimplemented from TGraph.

Definition at line 556 of file TGraphErrors.cxx.

Referenced by TGraphErrors().

Double_t TGraphErrors::GetErrorX ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along X at point i.

Reimplemented from TGraph.

Definition at line 571 of file TGraphErrors.cxx.

Referenced by Apply(), and testHisto1DFit().

Double_t TGraphErrors::GetErrorXhigh ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along X at point i.

Reimplemented from TGraph.

Definition at line 595 of file TGraphErrors.cxx.

Double_t TGraphErrors::GetErrorXlow ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along X at point i.

Reimplemented from TGraph.

Definition at line 607 of file TGraphErrors.cxx.

Double_t TGraphErrors::GetErrorY ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along Y at point i.

Reimplemented from TGraph.

Definition at line 583 of file TGraphErrors.cxx.

Referenced by Apply(), and testHisto1DFit().

Double_t TGraphErrors::GetErrorYhigh ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along X at point i.

Reimplemented from TGraph.

Definition at line 619 of file TGraphErrors.cxx.

Double_t TGraphErrors::GetErrorYlow ( Int_t i ) const

virtual

This function is called by GraphFitChisquare.

It returns the error along X at point i.

Reimplemented from TGraph.

Definition at line 631 of file TGraphErrors.cxx.

Double_t* TGraphErrors::GetEX ( ) const

inlinevirtual

Reimplemented from TGraph.

Definition at line 68 of file TGraphErrors.h.

Referenced by TGraphPainter::PaintGraphPolar().

Double_t* TGraphErrors::GetEY ( ) const

inlinevirtual

Reimplemented from TGraph.

Definition at line 69 of file TGraphErrors.h.

Referenced by TTreePerfStats::Finish(), ROOT::Fit::GetConfidenceIntervals(), TGraphPainter::PaintGraphPolar(), and TTreePerfStats::SavePrimitive().

Int_t TGraphErrors::Merge ( TCollection * li )

virtual

Adds all graphs with errors from the collection to this graph.

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

Reimplemented from TGraph.

Definition at line 642 of file TGraphErrors.cxx.

TGraphErrors & TGraphErrors::operator= ( const TGraphErrors & gr )

TGraphErrors assignment operator.

Definition at line 184 of file TGraphErrors.cxx.

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

virtual

Print graph and errors values.

Reimplemented from TGraph.

Definition at line 671 of file TGraphErrors.cxx.

Referenced by TProofBench::DrawCPU(), TProofBench::DrawDataSet(), and TProofBench::DrawEfficiency().

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

virtual

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

Reimplemented from TGraph.

Definition at line 682 of file TGraphErrors.cxx.

void TGraphErrors::SetPointError	(	Double_t	ex,
		Double_t	ey
	)

virtual

Set ex and ey values for point pointed by the mouse.

Definition at line 756 of file TGraphErrors.cxx.

Referenced by Apply(), DoMerge(), TAdvancedGraphicsDialog::DrawConfidenceLevels(), TTreePerfStats::FileReadEvent(), TBackCompFitter::GetConfidenceIntervals(), TProofBench::GetGraph(), testHisto1DFit(), and TGraphErrors().

void TGraphErrors::SetPointError	(	Int_t	i,
		Double_t	ex,
		Double_t	ey
	)

virtual

Set ex and ey values for point number i.

Definition at line 784 of file TGraphErrors.cxx.

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

protectedvirtual

Swap points.

Reimplemented from TGraph.

Definition at line 839 of file TGraphErrors.cxx.

Member Data Documentation

Double_t* TGraphErrors::fEX

protected

Definition at line 31 of file TGraphErrors.h.

Referenced by ComputeRange(), CopyAndRelease(), CopyPoints(), CtorAllocate(), FillZero(), GetErrorX(), GetErrorXhigh(), GetErrorXlow(), GetEX(), Merge(), operator=(), Print(), SavePrimitive(), SetPointError(), SwapPoints(), TGraphErrors(), and ~TGraphErrors().

Double_t* TGraphErrors::fEY

protected

Definition at line 32 of file TGraphErrors.h.

Referenced by ComputeRange(), CopyAndRelease(), CopyPoints(), CtorAllocate(), FillZero(), GetErrorY(), GetErrorYhigh(), GetErrorYlow(), GetEY(), Merge(), operator=(), Print(), SavePrimitive(), SetPointError(), SwapPoints(), TGraphErrors(), and ~TGraphErrors().

Collaboration diagram for TGraphErrors:

[legend]

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

hist/hist/inc/TGraphErrors.h
hist/hist/src/TGraphErrors.cxx

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation