library: libHist #include "TGraph2DErrors.h"

# TGraph2DErrors

class description - source file - inheritance tree (.pdf)

## class TGraph2DErrors : public TGraph2D

| Inheritance Chart:
`TObject`
| <- | `TNamed`
`TAttLine`
`TAttFill`
`TAttMarker`
| <- | `TGraph2D`
| <- | `TGraph2DErrors` |

        public:

                           TGraph2DErrors()
                           TGraph2DErrors(Int_t n)
                           TGraph2DErrors(Int_t n, Double_t* x, Double_t* y, Double_t* z, Double_t* ex = 0, Double_t* ey = 0, Double_t* ez = 0, Option_t* option = "")
                           TGraph2DErrors(const TGraph2DErrors&)
                   virtual ~TGraph2DErrors()
            static TClass* Class()
          virtual Double_t GetErrorX(Int_t bin) const
          virtual Double_t GetErrorY(Int_t bin) const
          virtual Double_t GetErrorZ(Int_t bin) const
                 Double_t* GetEX() const
                 Double_t* GetEY() const
                 Double_t* GetEZ() const
           virtual TClass* IsA() const
           TGraph2DErrors& operator=(const TGraph2DErrors&)
              virtual void SetPoint(Int_t i, Double_t x, Double_t y, Double_t z)
              virtual void SetPointError(Int_t i, Double_t ex, Double_t ey, Double_t ez)
              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
          Double_t* fEZ  [fNpoints] array of Z errors

## Class Description

       A TGraph2DErrors is a TGraph2D with errors.

TGraph2DErrors(): TGraph2D()

     TGraph2DErrors default constructor

TGraph2DErrors(Int_t n) : TGraph2D(n)

     TGraph2DErrors normal constructor
     the arrays are preset to zero

TGraph2DErrors(Int_t n, Double_t *x, Double_t *y, Double_t *z, Double_t *ex, Double_t *ey, Double_t *ez, Option_t *) :TGraph2D(n, x, y, z)

     TGraph2DErrors constructor with doubles vectors as input.

~TGraph2DErrors()

     TGraph2DErrors destructor.

Double_t GetErrorX(Int_t i) const

     This function is called by Graph2DFitChisquare.
     It returns the error along X at point i.

Double_t GetErrorY(Int_t i) const

     This function is called by Graph2DFitChisquare.
     It returns the error along X at point i.

Double_t GetErrorZ(Int_t i) const

     This function is called by Graph2DFitChisquare.
     It returns the error along X at point i.

void SetPoint(Int_t i, Double_t x, Double_t y, Double_t z)

     Set x, y and z values for point number i

void SetPointError(Int_t i, Double_t ex, Double_t ey, Double_t ez)

     Set ex, ey and ez values for point number i

void Streamer(TBuffer &b)

     Stream an object of class TGraphErrors.

### Inline Functions

                  Double_t* GetEX() const
                  Double_t* GetEY() const
                  Double_t* GetEZ() const
                    TClass* Class()
                    TClass* IsA() const
                       void ShowMembers(TMemberInspector& insp, char* parent)
                       void StreamerNVirtual(TBuffer& b)
             TGraph2DErrors TGraph2DErrors(const TGraph2DErrors&)
            TGraph2DErrors& operator=(const TGraph2DErrors&)

Author: Olivier Couet
Last update: root/hist:$Name: $:$Id: TGraph2DErrors.cxx,v 1.00
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *