 ROOT   Reference Guide
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A TGraph is an 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.

#### Notes

• 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 as small as possible.
• The TGraph constructors do not have the TGraph title and name as parameters. A TGraph has the default title and name "Graph". To change the default title and name SetTitle and SetName should be called on the TGraph after its creation. TGraph was a light weight object to start with, like TPolyline or TPolyMarker. That’s why it did not have any title and name parameters in the constructors.

#### Example

The picture below gives an example:

{
double x, y;
int n = 20;
for (int i=0;i<n;i++) {
x[i] = i*0.1;
y[i] = 10*sin(x[i]+0.2);
}
auto g = new TGraph(n,x,y);
g->SetTitle("Graph title;X title;Y title");
g->Draw("AC*");
}
#define g(i)
Definition RSha256.hxx:105
TGraph()
Graph default constructor.
Definition TGraph.cxx:108
Double_t y[n]
Definition legend1.C:17
Double_t x[n]
Definition legend1.C:17
const Int_t n
Definition legend1.C:16 #### Default X-Points

If one doesn't specify the points in the x-axis, they will get the default values 0, 1, 2, 3, (etc. depending on the length of the y-points):

{
double y = {3, 8, 1, 10, 5, 7};
auto g = new TGraph(6,y);
g->SetTitle("A Graph with default X points");
g->Draw();
} Definition at line 41 of file TGraph.h.

## Public Types

enum  EStatusBits {
kNoStats = (1ULL << ( 9 )) , kClipFrame = (1ULL << ( 10 )) , kResetHisto = (1ULL << ( 17 )) , kNotEditable = (1ULL << ( 18 )) ,
kIsSortedX = (1ULL << ( 19 )) , kIsHighlight = (1ULL << ( 20 ))
} Public Types inherited from TObject
enum  {
kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 ,
}

enum  { kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }

enum  EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }

enum  EStatusBits {
kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) ,
kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 ))
}

## Public Member Functions

TGraph ()
Graph default constructor.

TGraph (const char *filename, const char *format="%lg %lg", Option_t *option="")
Graph constructor reading input from filename.

TGraph (const TF1 *f, Option_t *option="")
Graph constructor importing its parameters from the TF1 object passed as argument.

TGraph (const TGraph &gr)
Copy constructor for this graph.

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

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.

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.

TGraph (Int_t n)
Constructor with only the number of points set the arrays x and y will be set later.

TGraph (Int_t n, const Double_t *x, const Double_t *y)
Graph normal constructor with doubles.

TGraph (Int_t n, const Double_t *y, Double_t start=0., Double_t step=1.)
Default X-Points constructor.

TGraph (Int_t n, const Float_t *x, const Float_t *y)
Graph normal constructor with floats.

TGraph (Int_t n, const Int_t *x, const Int_t *y)
Graph normal constructor with ints.

~TGraph () override
Graph default destructor.

virtual void AddPoint (Double_t x, Double_t y)
Append a new point to the graph.

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.

void Browse (TBrowser *b) override
Browse.

virtual Double_t Chisquare (TF1 *f1, Option_t *option="") const
Return the chisquare of this graph with respect to f1.

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.

Int_t DistancetoPrimitive (Int_t px, Int_t py) override
Compute distance from point px,py to a graph.

void Draw (Option_t *chopt="") override
Draw this graph with its current attributes.

virtual void DrawGraph (Int_t n, const Double_t *x=nullptr, const Double_t *y=nullptr, Option_t *option="")
Draw this graph with new attributes.

virtual void DrawGraph (Int_t n, const Float_t *x, const Float_t *y, Option_t *option="")
Draw this graph with new attributes.

virtual void DrawGraph (Int_t n, const Int_t *x, const Int_t *y, Option_t *option="")
Draw this graph with new attributes.

virtual void DrawPanel ()
Display a panel with all graph drawing options.

virtual Double_t Eval (Double_t x, TSpline *spline=nullptr, Option_t *option="") const
Interpolate points in this graph at x using a TSpline.

void ExecuteEvent (Int_t event, Int_t px, Int_t py) override
Execute action corresponding to one event.

virtual void Expand (Int_t newsize)
If array sizes <= newsize, expand storage to 2*newsize.

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.

TObjectFindObject (const char *name) const override
Search object named name in the list of functions.

TObjectFindObject (const TObject *obj) const override
Search object obj in the list of functions.

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.

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.

virtual void FitPanel ()
Display a GUI panel with all graph fit options.

virtual Double_t GetCorrelationFactor () const
Return graph correlation factor.

virtual Double_t GetCovariance () const
Return covariance of vectors x,y.

Bool_t GetEditable () const
Return kTRUE if kNotEditable bit is not set, kFALSE otherwise.

virtual Double_t GetErrorX (Int_t bin) const
It always returns a negative value. Real implementation in TGraphErrors.

virtual Double_t GetErrorXhigh (Int_t bin) const
It always returns a negative value.

virtual Double_t GetErrorXlow (Int_t bin) const
It always returns a negative value.

virtual Double_t GetErrorY (Int_t bin) const
It always returns a negative value. Real implementation in TGraphErrors.

virtual Double_t GetErrorYhigh (Int_t bin) const
It always returns a negative value.

virtual Double_t GetErrorYlow (Int_t bin) const
It always returns a negative value.

virtual Double_tGetEX () const

virtual Double_tGetEXhigh () const

virtual Double_tGetEXhighd () const

virtual Double_tGetEXlow () const

virtual Double_tGetEXlowd () const

virtual Double_tGetEY () const

virtual Double_tGetEYhigh () const

virtual Double_tGetEYhighd () const

virtual Double_tGetEYlow () const

virtual Double_tGetEYlowd () const

TF1GetFunction (const char *name) const
Return pointer to function with name.

virtual TH1FGetHistogram () const
Returns a pointer to the histogram used to draw the axis Takes into account the two following cases.

TListGetListOfFunctions () const

Double_t GetMaximum () const

Int_t GetMaxSize () const

virtual Double_t GetMean (Int_t axis=1) const
Return mean value of X (axis=1) or Y (axis=2)

Double_t GetMinimum () const

Int_t GetN () const

char * GetObjectInfo (Int_t px, Int_t py) const override
Implementation to get information on point of graph at cursor position Adapted from class TH1.

virtual Int_t GetPoint (Int_t i, Double_t &x, Double_t &y) const
Get x and y values for point number i.

virtual Double_t GetPointX (Int_t i) const
Get x value for point i.

virtual Double_t GetPointY (Int_t i) const
Get y value for point i.

virtual Double_t GetRMS (Int_t axis=1) const
Return RMS of X (axis=1) or Y (axis=2)

Double_tGetX () const

TAxisGetXaxis () const
Get x axis of the graph.

Double_tGetY () const

TAxisGetYaxis () const
Get y axis of the graph.

virtual void InitExpo (Double_t xmin=0, Double_t xmax=0)
Compute Initial values of parameters for an exponential.

virtual void InitGaus (Double_t xmin=0, Double_t xmax=0)
Compute Initial values of parameters for a gaussian.

virtual void InitPolynom (Double_t xmin=0, Double_t xmax=0)
Compute Initial values of parameters for a polynom.

virtual Int_t InsertPoint ()
Insert a new point at the mouse position.

virtual void InsertPointBefore (Int_t ipoint, Double_t x, Double_t y)
Insert a new point with coordinates (x,y) before the point number ipoint.

virtual Double_t Integral (Int_t first=0, Int_t last=-1) const
Integrate the TGraph data within a given (index) range.

TClassIsA () const override

virtual Bool_t IsEditable () const

virtual Bool_t IsHighlight () 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.

virtual void LeastSquareFit (Int_t m, Double_t *a, Double_t xmin=0, Double_t xmax=0)
Least squares polynomial fitting without weights.

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.

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

virtual void MovePoints (Double_t dx, Double_t dy, Bool_t logx=kFALSE, Bool_t logy=kFALSE)
Move all graph points on specified values dx,dy If log argument specified, calculation done in logarithmic scale like: new_value = exp( log(old_value) + delta );.

TGraphoperator= (const TGraph &)
Equal operator for this graph.

void Paint (Option_t *chopt="") override
Draw this graph with its current attributes.

void PaintGraph (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
Draw the (x,y) as a graph.

void PaintGrapHist (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
Draw the (x,y) as a histogram.

virtual void PaintStats (TF1 *fit)
Draw the stats.

void Print (Option_t *chopt="") const override
Print graph values.

void RecursiveRemove (TObject *obj) override
Recursively remove object from the list of functions.

virtual Int_t RemovePoint ()
Delete point close to the mouse position Returns index of removed point (or -1 if nothing was changed)

virtual Int_t RemovePoint (Int_t ipoint)
Delete point number ipoint Returns index of removed point (or -1 if nothing was changed)

void SaveAs (const char *filename, Option_t *option="") const override
Save the graph as .csv, .tsv or .txt.

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

virtual void Scale (Double_t c1=1., Option_t *option="y")
Multiply the values of a TGraph by a constant c1.

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.

virtual void SetEditable (Bool_t editable=kTRUE)
if editable=kFALSE, the graph cannot be modified with the mouse by default a TGraph is editable

virtual void SetHighlight (Bool_t set=kTRUE)
Set highlight (enable/disble) mode for the graph by default highlight mode is disable.

virtual void SetHistogram (TH1F *h)

virtual void SetMaximum (Double_t maximum=-1111)
Set the maximum of the graph.

virtual void SetMinimum (Double_t minimum=-1111)
Set the minimum of the graph.

void SetName (const char *name="") override
Set graph name.

void SetNameTitle (const char *name="", const char *title="") override
Set graph name and title.

virtual void SetPoint (Int_t i, Double_t x, Double_t y)
Set x and y values for point number i.

virtual void SetPointX (Int_t i, Double_t x)
Set x value for point i.

virtual void SetPointY (Int_t i, Double_t y)
Set y value for point i.

virtual void SetStats (Bool_t stats=kTRUE)
Set statistics option on/off.

void SetTitle (const char *title="") override
Change (i.e.

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.

void Streamer (TBuffer &) override
Stream an object of class TGraph.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

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

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. Public Member Functions inherited from TNamed
TNamed ()

TNamed (const char *name, const char *title)

TNamed (const TNamed &named)
TNamed copy ctor.

TNamed (const TString &name, const TString &title)

virtual ~TNamed ()
TNamed destructor.

void Clear (Option_t *option="") override
Set name and title to empty strings ("").

TObjectClone (const char *newname="") const override
Make a clone of an object using the Streamer facility.

Int_t Compare (const TObject *obj) const override
Compare two TNamed objects.

void Copy (TObject &named) const override
Copy this to obj.

virtual void FillBuffer (char *&buffer)
Encode TNamed into output buffer.

const char * GetName () const override
Returns name of object.

const char * GetTitle () const override
Returns title of object.

ULong_t Hash () const override
Return hash value for this object.

TClassIsA () const override

Bool_t IsSortable () const override

void ls (Option_t *option="") const override
List TNamed name and title.

TNamedoperator= (const TNamed &rhs)
TNamed assignment operator.

void Print (Option_t *option="") const override
Print TNamed name and title.

virtual Int_t Sizeof () const
Return size of the TNamed part of the TObject.

void Streamer (TBuffer &) override
Stream an object of class TObject.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b) Public Member Functions inherited from TObject
TObject ()
TObject constructor.

TObject (const TObject &object)
TObject copy ctor.

virtual ~TObject ()
TObject destructor.

void AbstractMethod (const char *method) const
Use this method to implement an "abstract" method that you don't want to leave purely abstract.

Append graphics object to current pad.

ULong_t CheckedHash ()
Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.

virtual const char * ClassName () const
Returns name of class to which the object belongs.

virtual void Delete (Option_t *option="")
Delete this object.

virtual void DrawClass () const
Draw class inheritance tree of the class to which this object belongs.

virtual TObjectDrawClone (Option_t *option="") const
Draw a clone of this object in the current selected pad with: gROOT->SetSelectedPad(c1).

virtual void Dump () const
Dump contents of object on stdout.

virtual void Error (const char *method, const char *msgfmt,...) const
Issue error message.

virtual void Execute (const char *method, const char *params, Int_t *error=nullptr)
Execute method on this object with the given parameter string, e.g.

virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=nullptr)
Execute method on this object with parameters stored in the TObjArray.

virtual void Fatal (const char *method, const char *msgfmt,...) const
Issue fatal error message.

virtual Option_tGetDrawOption () const
Get option used by the graphics system to draw this object.

virtual const char * GetIconName () const
Returns mime type name of object.

virtual Option_tGetOption () const

virtual UInt_t GetUniqueID () const
Return the unique object id.

virtual Bool_t HandleTimer (TTimer *timer)
Execute action in response of a timer timing out.

Bool_t HasInconsistentHash () const
Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.

virtual void Info (const char *method, const char *msgfmt,...) const
Issue info message.

virtual Bool_t InheritsFrom (const char *classname) const
Returns kTRUE if object inherits from class "classname".

virtual Bool_t InheritsFrom (const TClass *cl) const
Returns kTRUE if object inherits from TClass cl.

virtual void Inspect () const
Dump contents of this object in a graphics canvas.

void InvertBit (UInt_t f)

Bool_t IsDestructed () const
IsDestructed.

virtual Bool_t IsEqual (const TObject *obj) const
Default equal comparison (objects are equal if they have the same address in memory).

virtual Bool_t IsFolder () const
Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).

R__ALWAYS_INLINE Bool_t IsOnHeap () const

R__ALWAYS_INLINE Bool_t IsZombie () const

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).

virtual Bool_t Notify ()
This method must be overridden to handle object notification (the base implementation is no-op).

void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
Use this method to declare a method obsolete.

void operator delete (void *ptr)
Operator delete.

void operator delete[] (void *ptr)
Operator delete [].

void * operator new (size_t sz)

void * operator new (size_t sz, void *vp)

void * operator new[] (size_t sz)

void * operator new[] (size_t sz, void *vp)

TObjectoperator= (const TObject &rhs)
TObject assignment operator.

virtual void Pop ()
Pop on object drawn in a pad to the top of the display list.

virtual Int_t Read (const char *name)
Read contents of object with specified name from the current directory.

void ResetBit (UInt_t f)

void SetBit (UInt_t f)

void SetBit (UInt_t f, Bool_t set)
Set or unset the user status bits as specified in f.

virtual void SetDrawOption (Option_t *option="")
Set drawing option for object.

virtual void SetUniqueID (UInt_t uid)
Set the unique object id.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

virtual void SysError (const char *method, const char *msgfmt,...) const
Issue system error message.

R__ALWAYS_INLINE Bool_t TestBit (UInt_t f) const

Int_t TestBits (UInt_t f) const

virtual void Warning (const char *method, const char *msgfmt,...) const
Issue warning message.

virtual Int_t Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
Write this object to the current directory.

virtual Int_t Write (const char *name=nullptr, Int_t option=0, Int_t bufsize=0) const
Write this object to the current directory. Public Member Functions inherited from TAttLine
TAttLine ()
AttLine default constructor.

TAttLine (Color_t lcolor, Style_t lstyle, Width_t lwidth)
AttLine normal constructor.

virtual ~TAttLine ()
AttLine destructor.

void Copy (TAttLine &attline) const
Copy this line attributes to a new TAttLine.

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.

virtual Color_t GetLineColor () const
Return the line color.

virtual Style_t GetLineStyle () const
Return the line style.

virtual Width_t GetLineWidth () const
Return the line width.

virtual void Modify ()
Change current line attributes if necessary.

virtual void ResetAttLine (Option_t *option="")
Reset this line attributes to default values.

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.

virtual void SetLineAttributes ()
Invoke the DialogCanvas Line attributes.

virtual void SetLineColor (Color_t lcolor)
Set the line color.

virtual void SetLineColorAlpha (Color_t lcolor, Float_t lalpha)
Set a transparent line color.

virtual void SetLineStyle (Style_t lstyle)
Set the line style.

virtual void SetLineWidth (Width_t lwidth)
Set the line width.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b) Public Member Functions inherited from TAttFill
TAttFill ()
AttFill default constructor.

TAttFill (Color_t fcolor, Style_t fstyle)
AttFill normal constructor.

virtual ~TAttFill ()
AttFill destructor.

void Copy (TAttFill &attfill) const
Copy this fill attributes to a new TAttFill.

virtual Color_t GetFillColor () const
Return the fill area color.

virtual Style_t GetFillStyle () const
Return the fill area style.

virtual Bool_t IsTransparent () const

virtual void Modify ()
Change current fill area attributes if necessary.

virtual void ResetAttFill (Option_t *option="")
Reset this fill attributes to default values.

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.

virtual void SetFillAttributes ()
Invoke the DialogCanvas Fill attributes.

virtual void SetFillColor (Color_t fcolor)
Set the fill area color.

virtual void SetFillColorAlpha (Color_t fcolor, Float_t falpha)
Set a transparent fill color.

virtual void SetFillStyle (Style_t fstyle)
Set the fill area style.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b) Public Member Functions inherited from TAttMarker
TAttMarker ()
TAttMarker default constructor.

TAttMarker (Color_t color, Style_t style, Size_t msize)
TAttMarker normal constructor.

virtual ~TAttMarker ()
TAttMarker destructor.

void Copy (TAttMarker &attmarker) const
Copy this marker attributes to a new TAttMarker.

virtual Color_t GetMarkerColor () const
Return the marker color.

virtual Size_t GetMarkerSize () const
Return the marker size.

virtual Style_t GetMarkerStyle () const
Return the marker style.

virtual void Modify ()
Change current marker attributes if necessary.

virtual void ResetAttMarker (Option_t *toption="")
Reset this marker attributes to the default values.

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.

virtual void SetMarkerAttributes ()
Invoke the DialogCanvas Marker attributes.

virtual void SetMarkerColor (Color_t mcolor=1)
Set the marker color.

virtual void SetMarkerColorAlpha (Color_t mcolor, Float_t malpha)
Set a transparent marker color.

virtual void SetMarkerSize (Size_t msize=1)
Set the marker size.

virtual void SetMarkerStyle (Style_t mstyle=1)
Set the marker style.

void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

## Static Public Member Functions

static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

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".

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".

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.

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.

static const char * DeclFileName () Static Public Member Functions inherited from TNamed
static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

static const char * DeclFileName () Static Public Member Functions inherited from TObject
static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

static const char * DeclFileName ()

static Longptr_t GetDtorOnly ()
Return destructor only flag.

static Bool_t GetObjectStat ()
Get status of object stat flag.

static void SetDtorOnly (void *obj)
Set destructor only flag.

static void SetObjectStat (Bool_t stat)
Turn on/off tracking of objects in the TObjectTable. Static Public Member Functions inherited from TAttLine
static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

static const char * DeclFileName () Static Public Member Functions inherited from TAttFill
static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

static const char * DeclFileName () Static Public Member Functions inherited from TAttMarker
static TClassClass ()

static const char * Class_Name ()

static constexpr Version_t Class_Version ()

static const char * DeclFileName ()

static Width_t GetMarkerLineWidth (Style_t style)
Internal helper function that returns the line width of the given marker style (0 = filled marker)

static Style_t GetMarkerStyleBase (Style_t style)
Internal helper function that returns the corresponding marker style with line width 1 for the given style.

## Protected Member Functions

virtual Double_t ** Allocate (Int_t newsize)
Allocate internal data structures for newsize points.

Double_t ** AllocateArrays (Int_t Narrays, Int_t arraySize)
Allocate arrays.

virtual void CopyAndRelease (Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
Copy points from fX and fY to arrays and arrays or to fX and fY if arrays == 0 and ibegin != iend.

virtual Bool_t CopyPoints (Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
Copy points from fX and fY to arrays and arrays or to fX and fY if arrays == 0 and ibegin != iend.

Bool_t CtorAllocate ()
In constructors set fNpoints than call this method.

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

Double_t ** ExpandAndCopy (Int_t size, Int_t iend)
if size > fMaxSize allocate new arrays of 2*size points and copy iend first points.

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.

TString SaveArray (std::ostream &out, const char *suffix, Int_t frameNumber, Double_t *arr)
Save array as C++ code Returns name of created array.

void SaveHistogramAndFunctions (std::ostream &out, const char *varname, Int_t &frameNumber, Option_t *option)
Save histogram and list of functions of TGraph as C++ statement Used in all TGraph-derived classes.

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

virtual void SwapPoints (Int_t pos1, Int_t pos2)
Swap points.

virtual void UpdateArrays (const std::vector< Int_t > &sorting_indices, Int_t numSortedPoints, Int_t low)
Update the fX and fY arrays with the sorted values. Protected Member Functions inherited from TObject
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
Interface to ErrorHandler (protected).

void MakeZombie ()

## Static Protected Member Functions

static void SwapValues (Double_t *arr, Int_t pos1, Int_t pos2)
Swap values.

## Protected Attributes

TListfFunctions
Pointer to list of functions (fits and user)

TH1FfHistogram
Pointer to histogram used for drawing axis.

Double_t fMaximum
Maximum value for plotting along y.

Int_t fMaxSize
!Current dimension of arrays fX and fY

Double_t fMinimum
Minimum value for plotting along y.

Int_t fNpoints
Number of points <= fMaxSize.

Double_tfX
[fNpoints] array of X points

Double_tfY
[fNpoints] array of Y points Protected Attributes inherited from TNamed
TString fName

TString fTitle Protected Attributes inherited from TAttLine
Color_t fLineColor
Line color.

Style_t fLineStyle
Line style.

Width_t fLineWidth
Line width. Protected Attributes inherited from TAttFill
Color_t fFillColor
Fill area color.

Style_t fFillStyle
Fill area style. Protected Attributes inherited from TAttMarker
Color_t fMarkerColor
Marker color.

Size_t fMarkerSize
Marker size.

Style_t fMarkerStyle
Marker style. Protected Types inherited from TObject
enum  { kOnlyPrepStep = (1ULL << ( 3 )) }

#include <TGraph.h>

Inheritance diagram for TGraph:
[legend]

## ◆ EStatusBits

 enum TGraph::EStatusBits
Enumerator
kNoStats

Don't draw stats box.

kClipFrame

Clip to the frame boundary.

kResetHisto

fHistogram must be reset in GetHistogram

kNotEditable

Bit set if graph is non editable.

kIsSortedX

Graph is sorted in X points.

kIsHighlight

Bit set if graph is highlight.

Definition at line 73 of file TGraph.h.

## ◆ TGraph() [1/12]

 TGraph::TGraph ( )

Graph default constructor.

Definition at line 108 of file TGraph.cxx.

## ◆ TGraph() [2/12]

 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 118 of file TGraph.cxx.

## ◆ TGraph() [3/12]

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

Graph normal constructor with ints.

Definition at line 129 of file TGraph.cxx.

## ◆ TGraph() [4/12]

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

Graph normal constructor with floats.

Definition at line 147 of file TGraph.cxx.

## ◆ TGraph() [5/12]

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

Graph normal constructor with doubles.

Definition at line 184 of file TGraph.cxx.

## ◆ TGraph() [6/12]

 TGraph::TGraph ( Int_t n, const Double_t * y, Double_t start = 0., Double_t step = 1. )

Default X-Points constructor.

The points along the x-axis get the default values start, start+step, start+2*step, start+3*step, etc ...

Definition at line 166 of file TGraph.cxx.

## ◆ TGraph() [7/12]

 TGraph::TGraph ( const TGraph & gr )

Copy constructor for this graph.

Definition at line 201 of file TGraph.cxx.

## ◆ TGraph() [8/12]

 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 297 of file TGraph.cxx.

## ◆ TGraph() [9/12]

 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 316 of file TGraph.cxx.

## ◆ TGraph() [10/12]

 TGraph::TGraph ( const TH1 * h )

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

Definition at line 332 of file TGraph.cxx.

## ◆ TGraph() [11/12]

 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 374 of file TGraph.cxx.

## ◆ TGraph() [12/12]

 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 '\t' (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 (' ', '\t', ',', ';') used once (e.g. "1;1") or in a combined way (" 1;,;; 1"). Note in that case, the instantiation is about two times slower.

Definition at line 438 of file TGraph.cxx.

## ◆ ~TGraph()

 TGraph::~TGraph ( )
override

Graph default destructor.

Definition at line 561 of file TGraph.cxx.

## Member Function Documentation

 virtual void TGraph::AddPoint ( Double_t x, Double_t y )
inlinevirtual

Append a new point to the graph.

Definition at line 97 of file TGraph.h.

## ◆ Allocate()

 Double_t ** TGraph::Allocate ( Int_t newsize )
protectedvirtual

Allocate internal data structures for newsize points.

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 585 of file TGraph.cxx.

## ◆ AllocateArrays()

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

Allocate arrays.

Definition at line 593 of file TGraph.cxx.

## ◆ Apply()

 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 TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 616 of file TGraph.cxx.

## ◆ Browse()

 void TGraph::Browse ( TBrowser * b )
overridevirtual

Browse.

Reimplemented from TObject.

Definition at line 629 of file TGraph.cxx.

## ◆ Chisquare()

 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 655 of file TGraph.cxx.

## ◆ Class()

 static TClass * TGraph::Class ( )
static
Returns
TClass describing this class

## ◆ Class_Name()

 static const char * TGraph::Class_Name ( )
static
Returns
Name of this class

## ◆ Class_Version()

 static constexpr Version_t TGraph::Class_Version ( )
inlinestaticconstexpr
Returns
Version of this class

Definition at line 200 of file TGraph.h.

## ◆ CompareArg()

 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 672 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 700 of file TGraph.cxx.

## ◆ CompareX()

 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 683 of file TGraph.cxx.

## ◆ CompareY()

 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 691 of file TGraph.cxx.

## ◆ ComputeRange()

 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 TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 709 of file TGraph.cxx.

## ◆ CopyAndRelease()

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

Copy points from fX and fY to arrays and arrays 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 TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 740 of file TGraph.cxx.

## ◆ CopyPoints()

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

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

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 757 of file TGraph.cxx.

## ◆ CtorAllocate()

 Bool_t TGraph::CtorAllocate ( )
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 783 of file TGraph.cxx.

## ◆ DeclFileName()

 static const char * TGraph::DeclFileName ( )
inlinestatic
Returns
Name of the file containing the class declaration

Definition at line 200 of file TGraph.h.

## ◆ DistancetoPrimitive()

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

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 853 of file TGraph.cxx.

## ◆ DoMerge()

 Bool_t TGraph::DoMerge ( const TGraph * g )
protectedvirtual

protected function to perform the merge operation of a graph

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2649 of file TGraph.cxx.

## ◆ Draw()

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

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 809 of file TGraph.cxx.

## ◆ DrawGraph() [1/3]

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

Draw this graph with new attributes.

Definition at line 889 of file TGraph.cxx.

## ◆ DrawGraph() [2/3]

 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 876 of file TGraph.cxx.

## ◆ DrawGraph() [3/3]

 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 863 of file TGraph.cxx.

## ◆ DrawPanel()

 void TGraph::DrawPanel ( )
virtual

Display a panel with all graph drawing options.

Definition at line 906 of file TGraph.cxx.

## ◆ Eval()

 Double_t TGraph::Eval ( Double_t x, TSpline * spline = nullptr, 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.

If the points are sorted in X a binary search is used (significantly faster) One needs to set the bit TGraph::SetBit(TGraph::kIsSortedX) before calling TGraph::Eval to indicate that the graph is sorted in X.

Definition at line 927 of file TGraph.cxx.

## ◆ ExecuteEvent()

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

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 1030 of file TGraph.cxx.

## ◆ Expand() [1/2]

 void TGraph::Expand ( Int_t newsize )
virtual

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

Definition at line 1039 of file TGraph.cxx.

## ◆ Expand() [2/2]

 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.

Definition at line 1049 of file TGraph.cxx.

## ◆ ExpandAndCopy()

 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 1063 of file TGraph.cxx.

## ◆ FillZero()

 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 TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 1076 of file TGraph.cxx.

## ◆ FindObject() [1/2]

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

Search object named name in the list of functions.

Reimplemented from TObject.

Definition at line 1085 of file TGraph.cxx.

## ◆ FindObject() [2/2]

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

Search object obj in the list of functions.

Reimplemented from TObject.

Definition at line 1093 of file TGraph.cxx.

## ◆ Fit() [1/2]

 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.

This is a different interface to TGraph fitting using TGraph::Fit(TF1 *f1,Option_t *, Option_t *, Axis_t, Axis_t) See there for the details about fitting a TGraph.

The parameter 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.

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

Definition at line 1228 of file TGraph.cxx.

## ◆ Fit() [2/2]

 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.

Parameters
 [in] f1 pointer to the function object [in] option string defining the fit options (see table below). [in] goption specify a list of graphics options. See TGraph::Draw and TGraphPainter for a complete list of these possible options. [in] rxmin lower fitting range [in] rxmax upper fitting range

### Graph Fitting Options

The list of fit options is given in parameter option.

option description
"S" The full result of the fit is returned in the TFitResultPtr. This is needed to get the covariance matrix of the fit. See TFitResult and the base class ROOT::Math::FitResult.
"W" Ignore all point errors when fitting a TGraphErrors or TGraphAsymmErrors
"F" Uses the default minimizer (e.g. Minuit) when fitting a linear function (e.g. polN) instead of the linear fitter.
"U" Uses a user specified objective function (e.g. user providedlikelihood function) defined using TVirtualFitter::SetFCN
"E" Performs a better parameter errors estimation using the Minos technique for all fit parameters.
"M" Uses the IMPROVE algorithm (available only in TMinuit). This algorithm attempts improve the found local minimum by searching for a better one.
"Q" Quiet mode (minimum printing)
"V" Verbose mode (default is between Q and V)
"+" Adds this new fitted function to the list of fitted functions. By default, the previous function is deleted and only the last one is kept.
"N" Does not store the graphics function, does not draw the histogram with the function after fitting.
"0" Does not draw the histogram and the fitted function after fitting, but in contrast to option "N", it stores the fitted function in the histogram list of functions.
"R" Fit using a fitting range specified in the function range with TF1::SetRange.
"B" Use this option when you want to fix one or more parameters and the fitting function is a predefined one (e.g gaus, expo,..), otherwise in case of pre-defined functions, some default initial values and limits are set.
"C" In case of linear fitting, do no calculate the chisquare (saves CPU time).
"G" Uses the gradient implemented in TF1::GradientPar for the minimization. This allows to use Automatic Differentiation when it is supported by the provided TF1 function.
"EX0" When fitting a TGraphErrors or TGraphAsymErrors do not consider errors in the X coordinates
"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

This function is used for fitting also the derived TGraph classes such as TGraphErrors or TGraphAsymmErrors. See the note below on how the errors are used when fitting a TGraphErrors or TGraphAsymmErrors.

The fitting of the TGraph, i.e simple data points without any error associated, is performed using the un-weighted least-square (chi-square) method.

### TGraphErrors fit:

In case of a TGraphErrors or TGraphAsymmErrors object, when x errors are present, the error along x, is projected along the y-direction by calculating the function at the points x-ex_low and x+ex_high, where ex_low and ex_high are the corresponding lower and upper error in x. The chi-square is then computed as the sum of the quantity below at each data 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 functionf(x).

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

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. This approach is called "effective variance method" and the implementation is provided in the function FitUtil::EvaluateChi2Effective

### 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 the function p0*x + p1*sin(x), you can create a TF1 object as

TF1 *f1 = new TF1("f1", "x++sin(x)", xmin, xmax);


For such a TF1 you don't have to set the initial conditions and the linear fitter is used. Going via the linear fitter for functions, linear in parameters, gives a considerable advantage in speed. When using the linear fitting it is also possible to perform a robust fitting with the Least Trimmed Square (LTS) regression algorithm, by using the fit option ROB. See the tutorial fitLinearRobust.C.

### Notes on TGraph/TGraphErrors Fitting:

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, use option "F" for linear function 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: parameter_error *= sqrt(chisquare/(ndf-1))

### General Fitting documentation

See in TH1::Fit for the documentation of

Definition at line 1205 of file TGraph.cxx.

## ◆ FitPanel()

 void TGraph::FitPanel ( )
virtual

Display a GUI panel with all graph fit options.

See class TFitEditor for example

Definition at line 1248 of file TGraph.cxx.

## ◆ GetCorrelationFactor()

 Double_t TGraph::GetCorrelationFactor ( ) const
virtual

Return graph correlation factor.

Definition at line 1270 of file TGraph.cxx.

## ◆ GetCovariance()

 Double_t TGraph::GetCovariance ( ) const
virtual

Return covariance of vectors x,y.

Definition at line 1282 of file TGraph.cxx.

## ◆ GetEditable()

 Bool_t TGraph::GetEditable ( ) const

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

Definition at line 2265 of file TGraph.cxx.

## ◆ GetErrorX()

 Double_t TGraph::GetErrorX ( Int_t bin ) const
virtual

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

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 1335 of file TGraph.cxx.

## ◆ GetErrorXhigh()

 Double_t TGraph::GetErrorXhigh ( Int_t bin ) const
virtual

It always returns a negative value.

Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphErrors, TGraphAsymmErrors, and TGraphMultiErrors.

Definition at line 1352 of file TGraph.cxx.

## ◆ GetErrorXlow()

 Double_t TGraph::GetErrorXlow ( Int_t bin ) const
virtual

It always returns a negative value.

Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphErrors, TGraphAsymmErrors, and TGraphMultiErrors.

Definition at line 1361 of file TGraph.cxx.

## ◆ GetErrorY()

 Double_t TGraph::GetErrorY ( Int_t bin ) const
virtual

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

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 1343 of file TGraph.cxx.

## ◆ GetErrorYhigh()

 Double_t TGraph::GetErrorYhigh ( Int_t bin ) const
virtual

It always returns a negative value.

Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphErrors, TGraphAsymmErrors, and TGraphMultiErrors.

Definition at line 1370 of file TGraph.cxx.

## ◆ GetErrorYlow()

 Double_t TGraph::GetErrorYlow ( Int_t bin ) const
virtual

It always returns a negative value.

Real implementation in TGraphErrors and TGraphAsymmErrors

Reimplemented in TGraphBentErrors, TGraphErrors, TGraphAsymmErrors, and TGraphMultiErrors.

Definition at line 1379 of file TGraph.cxx.

## ◆ GetEX()

 virtual Double_t * TGraph::GetEX ( ) const
inlinevirtual

Reimplemented in TGraphErrors.

Definition at line 139 of file TGraph.h.

## ◆ GetEXhigh()

 virtual Double_t * TGraph::GetEXhigh ( ) const
inlinevirtual

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, and TGraphMultiErrors.

Definition at line 141 of file TGraph.h.

## ◆ GetEXhighd()

 virtual Double_t * TGraph::GetEXhighd ( ) const
inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 146 of file TGraph.h.

## ◆ GetEXlow()

 virtual Double_t * TGraph::GetEXlow ( ) const
inlinevirtual

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, and TGraphMultiErrors.

Definition at line 142 of file TGraph.h.

## ◆ GetEXlowd()

 virtual Double_t * TGraph::GetEXlowd ( ) const
inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 145 of file TGraph.h.

## ◆ GetEY()

 virtual Double_t * TGraph::GetEY ( ) const
inlinevirtual

Reimplemented in TGraphErrors.

Definition at line 140 of file TGraph.h.

## ◆ GetEYhigh()

 virtual Double_t * TGraph::GetEYhigh ( ) const
inlinevirtual

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, and TGraphMultiErrors.

Definition at line 143 of file TGraph.h.

## ◆ GetEYhighd()

 virtual Double_t * TGraph::GetEYhighd ( ) const
inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 148 of file TGraph.h.

## ◆ GetEYlow()

 virtual Double_t * TGraph::GetEYlow ( ) const
inlinevirtual

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, and TGraphMultiErrors.

Definition at line 144 of file TGraph.h.

## ◆ GetEYlowd()

 virtual Double_t * TGraph::GetEYlowd ( ) const
inlinevirtual

Reimplemented in TGraphBentErrors.

Definition at line 147 of file TGraph.h.

## ◆ GetFunction()

 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 1390 of file TGraph.cxx.

## ◆ GetHistogram()

 TH1F * TGraph::GetHistogram ( ) const
virtual

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

Definition at line 1402 of file TGraph.cxx.

## ◆ GetListOfFunctions()

 TList * TGraph::GetListOfFunctions ( ) const
inline

Definition at line 124 of file TGraph.h.

## ◆ GetMaximum()

 Double_t TGraph::GetMaximum ( ) const
inline

Definition at line 149 of file TGraph.h.

## ◆ GetMaxSize()

 Int_t TGraph::GetMaxSize ( ) const
inline

Definition at line 129 of file TGraph.h.

## ◆ GetMean()

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

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

Definition at line 1298 of file TGraph.cxx.

## ◆ GetMinimum()

 Double_t TGraph::GetMinimum ( ) const
inline

Definition at line 150 of file TGraph.h.

## ◆ GetN()

 Int_t TGraph::GetN ( ) const
inline

Definition at line 130 of file TGraph.h.

## ◆ GetObjectInfo()

 char * TGraph::GetObjectInfo ( Int_t px, Int_t py ) const
overridevirtual

Implementation to get information on point of graph at cursor position Adapted from class TH1.

Reimplemented from TObject.

Definition at line 1559 of file TGraph.cxx.

## ◆ GetPoint()

 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 1507 of file TGraph.cxx.

## ◆ GetPointX()

 Double_t TGraph::GetPointX ( Int_t i ) const
virtual

Get x value for point i.

Definition at line 1518 of file TGraph.cxx.

## ◆ GetPointY()

 Double_t TGraph::GetPointY ( Int_t i ) const
virtual

Get y value for point i.

Definition at line 1529 of file TGraph.cxx.

## ◆ GetRMS()

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

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

Definition at line 1313 of file TGraph.cxx.

## ◆ GetX()

 Double_t * TGraph::GetX ( ) const
inline

Definition at line 137 of file TGraph.h.

## ◆ GetXaxis()

 TAxis * TGraph::GetXaxis ( ) const

Get x axis of the graph.

Definition at line 1540 of file TGraph.cxx.

## ◆ GetY()

 Double_t * TGraph::GetY ( ) const
inline

Definition at line 138 of file TGraph.h.

## ◆ GetYaxis()

 TAxis * TGraph::GetYaxis ( ) const

Get y axis of the graph.

Definition at line 1549 of file TGraph.cxx.

## ◆ InitExpo()

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

Compute Initial values of parameters for an exponential.

Definition at line 1632 of file TGraph.cxx.

## ◆ InitGaus()

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

Compute Initial values of parameters for a gaussian.

Definition at line 1594 of file TGraph.cxx.

## ◆ InitPolynom()

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

Compute Initial values of parameters for a polynom.

Definition at line 1653 of file TGraph.cxx.

## ◆ InsertPoint()

 Int_t TGraph::InsertPoint ( )
virtual

Insert a new point at the mouse position.

Definition at line 1673 of file TGraph.cxx.

## ◆ InsertPointBefore()

 void TGraph::InsertPointBefore ( Int_t ipoint, Double_t x, Double_t y )
virtual

Insert a new point with coordinates (x,y) before the point number ipoint.

Definition at line 1723 of file TGraph.cxx.

## ◆ Integral()

 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

Definition at line 1782 of file TGraph.cxx.

## ◆ IsA()

 TClass * TGraph::IsA ( ) const
inlineoverridevirtual
Returns
TClass describing current object

Reimplemented from TObject.

Reimplemented in TGraphPolar, TGraphQQ, TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 200 of file TGraph.h.

## ◆ IsEditable()

 virtual Bool_t TGraph::IsEditable ( ) const
inlinevirtual

Definition at line 164 of file TGraph.h.

## ◆ IsHighlight()

 virtual Bool_t TGraph::IsHighlight ( ) const
inlinevirtual

Definition at line 165 of file TGraph.h.

## ◆ IsInside()

 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 1815 of file TGraph.cxx.

## ◆ LeastSquareFit()

 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] a array of parameters [in] xmin 1st point number to fit (default =0) [in] xmax last point number to fit (default=fNpoints-1)

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

Definition at line 1830 of file TGraph.cxx.

## ◆ LeastSquareLinearFit()

 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 1905 of file TGraph.cxx.

## ◆ Merge()

 Int_t TGraph::Merge ( TCollection * li )
virtual

Adds all graphs from the collection to this graph.

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

Reimplemented in TGraphAsymmErrors, and TGraphErrors.

Definition at line 2631 of file TGraph.cxx.

## ◆ MovePoints()

 void TGraph::MovePoints ( Double_t dx, Double_t dy, Bool_t logx = kFALSE, Bool_t logy = kFALSE )
virtual

Move all graph points on specified values dx,dy If log argument specified, calculation done in logarithmic scale like: new_value = exp( log(old_value) + delta );.

Definition at line 2664 of file TGraph.cxx.

## ◆ operator=()

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

Equal operator for this graph.

Definition at line 232 of file TGraph.cxx.

## ◆ Paint()

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

Draw this graph with its current attributes.

Reimplemented from TObject.

Definition at line 1951 of file TGraph.cxx.

## ◆ PaintGraph()

 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 1960 of file TGraph.cxx.

## ◆ PaintGrapHist()

 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 1969 of file TGraph.cxx.

## ◆ PaintStats()

 void TGraph::PaintStats ( TF1 * fit )
virtual

Draw the stats.

Definition at line 1978 of file TGraph.cxx.

## ◆ Print()

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

Print graph values.

Reimplemented from TObject.

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 1987 of file TGraph.cxx.

## ◆ RecursiveRemove()

 void TGraph::RecursiveRemove ( TObject * obj )
overridevirtual

Recursively remove object from the list of functions.

Reimplemented from TObject.

Definition at line 1997 of file TGraph.cxx.

## ◆ RemovePoint() [1/2]

 Int_t TGraph::RemovePoint ( )
virtual

Delete point close to the mouse position Returns index of removed point (or -1 if nothing was changed)

Definition at line 2011 of file TGraph.cxx.

## ◆ RemovePoint() [2/2]

 Int_t TGraph::RemovePoint ( Int_t ipoint )
virtual

Delete point number ipoint Returns index of removed point (or -1 if nothing was changed)

Definition at line 2039 of file TGraph.cxx.

## ◆ SaveArray()

 TString TGraph::SaveArray ( std::ostream & out, const char * suffix, Int_t frameNumber, Double_t * arr )
protected

Save array as C++ code Returns name of created array.

Definition at line 2149 of file TGraph.cxx.

## ◆ SaveAs()

 void TGraph::SaveAs ( const char * filename, Option_t * option = "" ) const
overridevirtual

Save the graph as .csv, .tsv or .txt.

In case of any other extension, fall back to TObject::SaveAs

The result can be immediately imported into Excel, gnuplot, Python or whatever, without the needing to install pyroot, etc.

Parameters
 filename the name of the file where to store the graph option some tuning options

The file extension defines the delimiter used:

• .csv : comma
• .tsv : tab
• .txt : space

If option = "title" a title line is generated with the axis titles.

Reimplemented from TObject.

Definition at line 2067 of file TGraph.cxx.

## ◆ SaveHistogramAndFunctions()

 void TGraph::SaveHistogramAndFunctions ( std::ostream & out, const char * varname, Int_t & frameNumber, Option_t * option )
protected

Save histogram and list of functions of TGraph as C++ statement Used in all TGraph-derived classes.

Definition at line 2173 of file TGraph.cxx.

## ◆ SavePrimitive()

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

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

Reimplemented from TObject.

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2119 of file TGraph.cxx.

## ◆ Scale()

 void TGraph::Scale ( Double_t c1 = 1., Option_t * option = "y" )
virtual

Multiply the values of a TGraph by a constant c1.

If option contains "x" the x values are scaled If option contains "y" the y values are scaled If option contains "xy" both x and y values are scaled

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2232 of file TGraph.cxx.

## ◆ Set()

 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 2250 of file TGraph.cxx.

## ◆ SetEditable()

 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 2274 of file TGraph.cxx.

## ◆ SetHighlight()

 void TGraph::SetHighlight ( Bool_t set = kTRUE )
virtual

Set highlight (enable/disble) mode for the graph by default highlight mode is disable.

Definition at line 2284 of file TGraph.cxx.

## ◆ SetHistogram()

 virtual void TGraph::SetHistogram ( TH1F * h )
inlinevirtual

Definition at line 184 of file TGraph.h.

## ◆ SetMaximum()

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

Set the maximum of the graph.

Reimplemented in TGraphPolar.

Definition at line 2297 of file TGraph.cxx.

## ◆ SetMinimum()

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

Set the minimum of the graph.

Reimplemented in TGraphPolar.

Definition at line 2306 of file TGraph.cxx.

## ◆ SetName()

 void TGraph::SetName ( const char * name = "" )
overridevirtual

Set graph name.

Reimplemented from TNamed.

Definition at line 2354 of file TGraph.cxx.

## ◆ SetNameTitle()

 void TGraph::SetNameTitle ( const char * name = "", const char * title = "" )
overridevirtual

Set graph name and title.

Reimplemented from TNamed.

Definition at line 2390 of file TGraph.cxx.

## ◆ SetPoint()

 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 2315 of file TGraph.cxx.

## ◆ SetPointX()

 void TGraph::SetPointX ( Int_t i, Double_t x )
virtual

Set x value for point i.

Definition at line 2339 of file TGraph.cxx.

## ◆ SetPointY()

 void TGraph::SetPointY ( Int_t i, Double_t y )
virtual

Set y value for point i.

Definition at line 2347 of file TGraph.cxx.

## ◆ SetStats()

 void TGraph::SetStats ( Bool_t stats = kTRUE )
virtual

Set statistics option on/off.

By default, the statistics box is drawn. The paint options can be selected via gStyle->SetOptStat. This function sets/resets the kNoStats bit in the graph object. It has priority over the Style option.

Definition at line 2404 of file TGraph.cxx.

## ◆ SetTitle()

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

Change (i.e.

set) the title

if title is in the form stringt;stringx;stringy;stringz the graph title is set to stringt, the x axis title to stringx, the y axis title to stringy, and the z axis title to stringz.

To insert the character ; in one of the titles, one should use #; or #semicolon.

Reimplemented from TNamed.

Definition at line 2370 of file TGraph.cxx.

## ◆ ShrinkAndCopy()

 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 2426 of file TGraph.cxx.

## ◆ Sort()

 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
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);
const Bool_t kFALSE
Definition RtypesCore.h:101
A TGraphErrors is a TGraph with error bars.
Double_t * GetEY() const override
A TGraph is an object made of two arrays X and Y with npoints each.
Definition TGraph.h:41
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".
Definition TGraph.cxx:700
TGraphErrors * gr
Definition legend1.C:25
Definition graph.py:1

Definition at line 2459 of file TGraph.cxx.

## ◆ Streamer()

 void TGraph::Streamer ( TBuffer & b )
overridevirtual

Stream an object of class TGraph.

Reimplemented from TObject.

Reimplemented in TGraphPolar, TGraphQQ, TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2489 of file TGraph.cxx.

## ◆ StreamerNVirtual()

 void TGraph::StreamerNVirtual ( TBuffer & ClassDef_StreamerNVirtual_b )
inline

Definition at line 200 of file TGraph.h.

## ◆ SwapPoints()

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

Swap points.

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2556 of file TGraph.cxx.

## ◆ SwapValues()

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

Swap values.

Definition at line 2584 of file TGraph.cxx.

## ◆ UpdateArrays()

 void TGraph::UpdateArrays ( const std::vector< Int_t > & sorting_indices, Int_t numSortedPoints, Int_t low )
protectedvirtual

Update the fX and fY arrays with the sorted values.

Reimplemented in TGraphAsymmErrors, TGraphBentErrors, TGraphErrors, and TGraphMultiErrors.

Definition at line 2565 of file TGraph.cxx.

## ◆ UseCurrentStyle()

 void TGraph::UseCurrentStyle ( )
overridevirtual

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 2596 of file TGraph.cxx.

## ◆ Zero()

 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 2690 of file TGraph.cxx.

## ◆ fFunctions

 TList* TGraph::fFunctions
protected

Pointer to list of functions (fits and user)

Definition at line 49 of file TGraph.h.

## ◆ fHistogram

 TH1F* TGraph::fHistogram
protected

Pointer to histogram used for drawing axis.

Definition at line 50 of file TGraph.h.

## ◆ fMaximum

 Double_t TGraph::fMaximum
protected

Maximum value for plotting along y.

Definition at line 52 of file TGraph.h.

## ◆ fMaxSize

 Int_t TGraph::fMaxSize
protected

!Current dimension of arrays fX and fY

Definition at line 45 of file TGraph.h.

## ◆ fMinimum

 Double_t TGraph::fMinimum
protected

Minimum value for plotting along y.

Definition at line 51 of file TGraph.h.

## ◆ fNpoints

 Int_t TGraph::fNpoints
protected

Number of points <= fMaxSize.

Definition at line 46 of file TGraph.h.

## ◆ fX

 Double_t* TGraph::fX
protected

[fNpoints] array of X points

Definition at line 47 of file TGraph.h.

## ◆ fY

 Double_t* TGraph::fY
protected

[fNpoints] array of Y points

Definition at line 48 of file TGraph.h.

Libraries for TGraph: [legend]

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