TGraphErrors

class TGraphErrors : public TGraph

    protected:

      virtual void SwapPoints(Int_t pos1, Int_t pos2)

    public:

          TGraphErrors TGraphErrors()
          TGraphErrors TGraphErrors(Int_t n)
          TGraphErrors TGraphErrors(Int_t n, const Float_t* x, const Float_t* y, const Float_t* ex = 0, const Float_t* ey = 0)
          TGraphErrors TGraphErrors(Int_t n, const Double_t* x, const Double_t* y, const Double_t* ex = 0, const Double_t* ey = 0)
          TGraphErrors TGraphErrors(const TH1* h)
          TGraphErrors TGraphErrors(const TGraphErrors&)
          virtual void ~TGraphErrors()
          virtual void Apply(TF1* f)
        static TClass* Class()
          virtual void ComputeRange(Double_t& xmin, Double_t& ymin, Double_t& xmax, Double_t& ymax) const
      virtual Double_t GetErrorX(Int_t bin) const
      virtual Double_t GetErrorY(Int_t bin) const
             Double_t* GetEX() const
             Double_t* GetEY() const
         virtual Int_t InsertPoint()
       virtual TClass* IsA() const
          virtual void Paint(Option_t* chopt)
          virtual void Print(Option_t* chopt) const
         virtual Int_t RemovePoint()
         virtual Int_t RemovePoint(Int_t ipoint)
          virtual void SavePrimitive(ofstream& out, Option_t* option)
          virtual void Set(Int_t n)
          virtual void SetPoint(Int_t i, Double_t x, Double_t y)
          virtual void SetPointError(Double_t ex, Double_t ey)
          virtual void SetPointError(Int_t i, Double_t ex, Double_t ey)
          virtual void ShowMembers(TMemberInspector& insp, char* parent)
          virtual void Streamer(TBuffer& b)
                  void StreamerNVirtual(TBuffer& b)

Data Members

    protected:

      Double_t* fEX  [fNpoints] array of X errors
      Double_t* fEY  [fNpoints] array of Y errors

Class Description

   A TGraphErrors is a TGraph with error bars.
   The various format options to draw a TGraphErrors are explained in
     TGraphErrors::Paint.

  The picture below has been generated by the following macro:
------------------------------------------------------------------------
{
   gROOT->Reset();
   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);

   Int_t n = 10;
   Double_t x[n]  = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
   Double_t y[n]  = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
   Double_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
   Double_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
   gr = new TGraphErrors(n,x,y,ex,ey);
   gr->SetTitle("TGraphErrors Example");
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(21);
   gr->Draw("ALP");

   c1->Update();
}

/*

*/

*-*-*-*-*-*-*-*-*-*-*TGraphErrors default constructor*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ================================

*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ===============================

  the arrays are preset to zero

*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ===============================

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

*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ===============================

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

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

*-*-*-*-*-*-*-*-*-*-*TGraphErrors default destructor*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ===============================

 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 <helbich@mail.desy.de>

    This function is called by GraphFitChisquare.
    It returns the error along X at point i.

    This function is called by GraphFitChisquare.
    It returns the error along Y at point i.

 Insert a new point at the mouse position

 Paint this TGraphErrors with its current attributes

 by default horizonthal and vertical small lines are drawn at
 the end of the error bars. if option "z" or "Z" is specified,
 these lines are not drawn.

 if option contains ">" an arrow is drawn at the end of the error bars
 if option contains "|>" a full arrow is drawn at the end of the error bars
 the size of the arrow is set to 2/3 of the marker size.

 By default, error bars are drawn. If option "X" is specified,
 the errors are not drawn (TGraph::Paint equivalent).

 if option "[]" is specified only the end vertical/horizonthal lines
 of the error bars are drawn. This option is interesting to superimpose
 systematic errors on top of a graph with statistical errors.

 Use gStyle->SetErrorX(dx) to control the size of the error along x.
 set dx = 0 to suppress the error along x.

 Use gStyle->SetEndErrorSize(np) to control the size of the lines
 at the end of the error bars (when option 1 is used).
 By default np=1. (np represents the number of pixels).

*-*-*-*-*-*-*-*-*-*-*Print graph and errors values*-*-*-*-*-*-*-*-*-*-*-*
*-*                  =============================

 Delete point close to the mouse position

 Delete point number ipnt

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

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

*-*-*-*-*-*-*-*-*-*-*Set x and y values for point number i*-*-*-*-*-*-*-*-*
*-*                  =====================================

*-*-*-*-*-*-*Set ex and ey values for point pointed by the mouse*-*-*-*
*-*          ===================================================

*-*-*-*-*-*-*-*-*-*-*Set ex and ey values for point number i*-*-*-*-*-*-*-*
*-*                  =======================================

 Stream an object of class TGraphErrors.

Inline Functions

           Double_t* GetEX() const
           Double_t* GetEY() const
             TClass* Class()
             TClass* IsA() const
                void ShowMembers(TMemberInspector& insp, char* parent)
                void StreamerNVirtual(TBuffer& b)
        TGraphErrors TGraphErrors(const TGraphErrors&)