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Reference Guide
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TGraphErrors Class Reference

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->SetMarkerStyle(21);
gr->Draw("ALP");
return c1;
}
pict1_TGraphErrors_001.png

Definition at line 26 of file TGraphErrors.h.

Public Member Functions

 TGraphErrors ()
 TGraphErrors default constructor. More...
 
 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 (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 2 columns of numbers. 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 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 GetErrorY (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_tGetEX () const
 
Double_tGetEY () const
 
virtual Int_t Merge (TCollection *list)
 Adds all graphs with errors from the collection to this graph. More...
 
TGraphErrorsoperator= (const TGraphErrors &gr)
 TGraphErrors assignment operator. 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 ()
 Graph default constructor. More...
 
 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 (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. 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 TObjectFindObject (const char *name) const
 Search object named name in the list of functions. More...
 
virtual TObjectFindObject (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...
 
virtual Double_t GetCorrelationFactor () const
 Return graph correlation factor. More...
 
virtual Double_t GetCovariance () const
 Return covariance of vectors x,y. More...
 
Bool_t GetEditable () const
 Return kTRUE if kNotEditable bit is not set, kFALSE otherwise. More...
 
virtual Double_tGetEXhigh () const
 
virtual Double_tGetEXhighd () const
 
virtual Double_tGetEXlow () const
 
virtual Double_tGetEXlowd () 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. More...
 
TH1FGetHistogram () const
 Returns a pointer to the histogram used to draw the axis Takes into account the two following cases. More...
 
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) More...
 
Double_t GetMinimum () const
 
Int_t GetN () const
 
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 Double_t GetRMS (Int_t axis=1) const
 Return RMS of X (axis=1) or Y (axis=2) More...
 
Double_tGetX () const
 
TAxisGetXaxis () const
 Get x axis of the graph. More...
 
Double_tGetY () const
 
TAxisGetYaxis () const
 Get y axis of the graph. 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 void InsertPointBefore (Int_t ipoint, Double_t x, Double_t y)
 Insert a new point with coordinates (x,y) before the point number ipoint. 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 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. 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...
 
TGraphoperator= (const TGraph &)
 Equal operator for this graph. More...
 
virtual void Paint (Option_t *chopt="")
 Draw this graph with its current attributes. More...
 
void PaintGraph (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
 Draw the (x,y) as a graph. More...
 
void PaintGrapHist (Int_t npoints, const Double_t *x, const Double_t *y, Option_t *chopt)
 Draw the (x,y) as a histogram. More...
 
virtual void PaintStats (TF1 *fit)
 Draw the stats. More...
 
virtual void 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 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 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 SetHighlight (Bool_t set=kTRUE)
 Set highlight (enable/disble) mode for the graph by default highlight mode is disable. 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 SetName (const char *name="")
 Set graph name. More...
 
virtual void SetNameTitle (const char *name="", const char *title="")
 Set graph name and title. 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 copy ctor. More...
 
virtual ~TNamed ()
 TNamed destructor. More...
 
virtual void Clear (Option_t *option="")
 Set name and title to empty strings (""). More...
 
virtual TObjectClone (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 ls (Option_t *option="") const
 List TNamed name and title. More...
 
TNamedoperator= (const TNamed &rhs)
 TNamed assignment operator. More...
 
virtual Int_t Sizeof () const
 Return size of the TNamed part of the TObject. More...
 
- Public Member Functions inherited from TObject
 TObject ()
 TObject constructor. More...
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
virtual ~TObject ()
 TObject destructor. 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...
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad. More...
 
ULong_t CheckedHash ()
 Checked and record whether for this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. 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 TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad). More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. 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 void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py). More...
 
virtual Option_tGetOption () const
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. More...
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out. More...
 
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. More...
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. 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...
 
void InvertBit (UInt_t f)
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory). More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
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). More...
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
voidoperator new (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz)
 
voidoperator new[] (size_t sz, void *vp)
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator. 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...
 
void ResetBit (UInt_t f)
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename. 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)
 
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 void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
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. 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...
 
- 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
 Return the line color. More...
 
virtual Style_t GetLineStyle () const
 Return the line style. More...
 
virtual Width_t GetLineWidth () const
 Return the line width. More...
 
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)
 Set the line color. More...
 
virtual void SetLineColorAlpha (Color_t lcolor, Float_t lalpha)
 Set a transparent line color. More...
 
virtual void SetLineStyle (Style_t lstyle)
 Set the line style. More...
 
virtual void SetLineWidth (Width_t lwidth)
 Set the line width. More...
 
- Public Member Functions inherited from TAttFill
 TAttFill ()
 AttFill default constructor. More...
 
 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
 Return the fill area color. More...
 
virtual Style_t GetFillStyle () const
 Return the fill area style. More...
 
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)
 Set the fill area color. More...
 
virtual void SetFillColorAlpha (Color_t fcolor, Float_t falpha)
 Set a transparent fill color. More...
 
virtual void SetFillStyle (Style_t fstyle)
 Set the fill area style. More...
 
- Public Member Functions inherited from TAttMarker
 TAttMarker ()
 TAttMarker default constructor. More...
 
 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
 Return the marker color. More...
 
virtual Size_t GetMarkerSize () const
 Return the marker size. More...
 
virtual Style_t GetMarkerStyle () const
 Return the marker style. More...
 
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)
 Set the marker color. More...
 
virtual void SetMarkerColorAlpha (Color_t mcolor, Float_t malpha)
 Set a transparent marker color. More...
 
virtual void SetMarkerSize (Size_t msize=1)
 Set the marker size. More...
 
virtual void SetMarkerStyle (Style_t mstyle=1)
 Set the marker style. More...
 

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 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 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 Public Member Functions inherited from TObject
static Long_t GetDtorOnly ()
 Return destructor only flag. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only flag. More...
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable. More...
 

Protected Member Functions

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 Bool_t DoMerge (const TGraph *g)
 protected function to perform the merge operation of a graph with errors 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 void SwapPoints (Int_t pos1, Int_t pos2)
 Swap points. 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
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected). More...
 
void MakeZombie ()
 

Protected Attributes

Double_tfEX
 [fNpoints] array of X errors More...
 
Double_tfEY
 [fNpoints] array of Y errors More...
 
- Protected Attributes inherited from TGraph
TListfFunctions
 Pointer to list of functions (fits and user) More...
 
TH1FfHistogram
 Pointer to histogram used for drawing axis. More...
 
Double_t fMaximum
 Maximum value for plotting along y. More...
 
Int_t fMaxSize
 !Current dimension of arrays fX and fY More...
 
Double_t fMinimum
 Minimum value for plotting along y. More...
 
Int_t fNpoints
 Number of points <= fMaxSize. More...
 
Double_tfX
 [fNpoints] array of X points More...
 
Double_tfY
 [fNpoints] array of Y points More...
 
- Protected Attributes inherited from TNamed
TString fName
 
TString fTitle
 
- Protected Attributes inherited from TAttLine
Color_t fLineColor
 Line color. More...
 
Style_t fLineStyle
 Line style. More...
 
Width_t fLineWidth
 Line width. More...
 
- Protected Attributes inherited from TAttFill
Color_t fFillColor
 Fill area color. More...
 
Style_t fFillStyle
 Fill area style. More...
 
- Protected Attributes inherited from TAttMarker
Color_t fMarkerColor
 Marker color. More...
 
Size_t fMarkerSize
 Marker size. More...
 
Style_t fMarkerStyle
 Marker style. More...
 

Additional Inherited Members

- Public Types inherited from TGraph
enum  EStatusBits {
  kClipFrame = BIT(10), kResetHisto = BIT(17), kNotEditable = BIT(18), kIsSortedX = BIT(19),
  kIsHighlight = BIT(20)
}
 
- Public Types inherited from TObject
enum  {
  kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kInconsistent = 0x08000000,
  kBitMask = 0x00ffffff
}
 
enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }
 
enum  EDeprecatedStatusBits { kObjInCanvas = BIT(3) }
 
enum  EStatusBits {
  kCanDelete = BIT(0), kMustCleanup = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5),
  kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}
 
- 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() [1/9]

TGraphErrors::TGraphErrors ( )

TGraphErrors default constructor.

Definition at line 71 of file TGraphErrors.cxx.

◆ TGraphErrors() [2/9]

TGraphErrors::TGraphErrors ( Int_t  n)

TGraphErrors normal constructor.

the arrays are preset to zero

Definition at line 82 of file TGraphErrors.cxx.

◆ TGraphErrors() [3/9]

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() [4/9]

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() [5/9]

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() [6/9]

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() [7/9]

TGraphErrors::TGraphErrors ( const TGraphErrors gr)

TGraphErrors copy constructor.

Definition at line 170 of file TGraphErrors.cxx.

◆ TGraphErrors() [8/9]

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() [9/9]

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

Definition at line 232 of file TGraphErrors.cxx.

◆ ~TGraphErrors()

TGraphErrors::~TGraphErrors ( )
virtual

TGraphErrors default destructor.

Definition at line 366 of file TGraphErrors.cxx.

Member Function Documentation

◆ Allocate()

Double_t ** TGraphErrors::Allocate ( Int_t  size)
inlineprotectedvirtual

Reimplemented from TGraph.

Definition at line 77 of file TGraphErrors.h.

◆ Apply()

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 386 of file TGraphErrors.cxx.

◆ CalculateScanfFields()

Int_t TGraphErrors::CalculateScanfFields ( const char *  fmt)
static

Calculate scan fields.

Definition at line 409 of file TGraphErrors.cxx.

◆ ComputeRange()

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 440 of file TGraphErrors.cxx.

◆ CopyAndRelease()

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 470 of file TGraphErrors.cxx.

◆ CopyPoints()

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 492 of file TGraphErrors.cxx.

◆ CtorAllocate()

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 516 of file TGraphErrors.cxx.

◆ DoMerge()

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 532 of file TGraphErrors.cxx.

◆ FillZero()

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 557 of file TGraphErrors.cxx.

◆ GetErrorX()

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 572 of file TGraphErrors.cxx.

◆ GetErrorXhigh()

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 596 of file TGraphErrors.cxx.

◆ GetErrorXlow()

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 608 of file TGraphErrors.cxx.

◆ GetErrorY()

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 584 of file TGraphErrors.cxx.

◆ GetErrorYhigh()

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 620 of file TGraphErrors.cxx.

◆ GetErrorYlow()

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 632 of file TGraphErrors.cxx.

◆ GetEX()

Double_t* TGraphErrors::GetEX ( ) const
inlinevirtual

Reimplemented from TGraph.

Definition at line 66 of file TGraphErrors.h.

◆ GetEY()

Double_t* TGraphErrors::GetEY ( ) const
inlinevirtual

Reimplemented from TGraph.

Definition at line 67 of file TGraphErrors.h.

◆ Merge()

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 643 of file TGraphErrors.cxx.

◆ operator=()

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

TGraphErrors assignment operator.

Definition at line 184 of file TGraphErrors.cxx.

◆ Print()

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

Print graph and errors values.

Reimplemented from TGraph.

Definition at line 672 of file TGraphErrors.cxx.

◆ SavePrimitive()

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 683 of file TGraphErrors.cxx.

◆ SetPointError() [1/2]

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

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

Definition at line 762 of file TGraphErrors.cxx.

◆ SetPointError() [2/2]

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 790 of file TGraphErrors.cxx.

◆ SwapPoints()

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

Swap points.

Reimplemented from TGraph.

Definition at line 845 of file TGraphErrors.cxx.

Member Data Documentation

◆ fEX

Double_t* TGraphErrors::fEX
protected

[fNpoints] array of X errors

Definition at line 29 of file TGraphErrors.h.

◆ fEY

Double_t* TGraphErrors::fEY
protected

[fNpoints] array of Y errors

Definition at line 30 of file TGraphErrors.h.

Libraries for TGraphErrors:
[legend]

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