library: libGraf
#include "TGraphBentErrors.h"

TGraphBentErrors

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

class TGraphBentErrors : public TGraph

Inheritance Chart:
TObject
<-
TNamed
TAttLine
TAttFill
TAttMarker
<-
TGraph
<-
TGraphBentErrors
 

    protected:

      virtual Double_t** Allocate(Int_t size)
            virtual void CopyAndRelease(Double_t** newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
          virtual Bool_t CopyPoints(Double_t** arrays, Int_t ibegin, Int_t iend, Int_t obegin)
                  Bool_t CtorAllocate()
            virtual void FillZero(Int_t begin, Int_t end, Bool_t from_ctor = kTRUE)
            virtual void SwapPoints(Int_t pos1, Int_t pos2)

    public:

                        TGraphBentErrors()
                        TGraphBentErrors(Int_t n)
                        TGraphBentErrors(Int_t n, const Float_t* x, const Float_t* y, const Float_t* exl = 0, const Float_t* exh = 0, const Float_t* eyl = 0, const Float_t* eyh = 0, const Float_t* exld = 0, const Float_t* exhd = 0, const Float_t* eyld = 0, const Float_t* eyhd = 0)
                        TGraphBentErrors(Int_t n, const Double_t* x, const Double_t* y, const Double_t* exl = 0, const Double_t* exh = 0, const Double_t* eyl = 0, const Double_t* eyh = 0, const Double_t* exld = 0, const Double_t* exhd = 0, const Double_t* eyld = 0, const Double_t* eyhd = 0)
                        TGraphBentErrors(const TGraphBentErrors& gr)
                virtual ~TGraphBentErrors()
           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 GetErrorXhigh(Int_t bin) const
       virtual Double_t GetErrorXlow(Int_t bin) const
       virtual Double_t GetErrorY(Int_t bin) const
       virtual Double_t GetErrorYhigh(Int_t bin) const
       virtual Double_t GetErrorYlow(Int_t bin) const
      virtual Double_t* GetEXhigh() const
      virtual Double_t* GetEXlow() const
      virtual Double_t* GetEYhigh() const
      virtual Double_t* GetEYlow() const
        virtual TClass* IsA() const
      TGraphBentErrors& operator=(const TGraphBentErrors&)
           virtual void Paint(Option_t* chopt = "")
           virtual void Print(Option_t* chopt = "") const
           virtual void SavePrimitive(ostream& out, Option_t* option = "")
           virtual void SetPointError(Double_t exl, Double_t exh, Double_t eyl, Double_t eyh)
           virtual void SetPointError(Int_t i, Double_t exl, Double_t exh, Double_t eyl, Double_t eyh)
           virtual void ShowMembers(TMemberInspector& insp, char* parent)
           virtual void Streamer(TBuffer& b)
                   void StreamerNVirtual(TBuffer& b)

Data Members


    protected:

      Double_t* fEXlow    [fNpoints] array of X low errors
      Double_t* fEXhigh   [fNpoints] array of X high errors
      Double_t* fEYlow    [fNpoints] array of Y low errors
      Double_t* fEYhigh   [fNpoints] array of Y high errors
      Double_t* fEXlowd   [fNpoints] array of X low displacements
      Double_t* fEXhighd  [fNpoints] array of X high displacements
      Double_t* fEYlowd   [fNpoints] array of Y low displacements
      Double_t* fEYhighd  [fNpoints] array of Y high displacements

Class Description

______________________________________________________________________________

   A TGraphBentErrors is a TGraph with bent, assymetric error bars.
   The various format options to draw a TGraphBentErrors are explained in
     TGraphBentErrors::Paint.

  The picture below has been generated by the following macro:
  FIXME There are 2 bent error bars in the picture, not one!
------------------------------------------------------------------------
{
   gROOT->Reset();

   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 exl[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
   Double_t eyl[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
   Double_t exh[n] = {.02,.08,.05,.05,.03,.03,.04,.05,.06,.03};
   Double_t eyh[n] = {.6,.5,.4,.3,.2,.2,.3,.4,.5,.6};
   Double_t exld[n] = {.0,.0,.0,.0,.0,.0,.0,.0,.0,.0};
   Double_t eyld[n] = {.0,.0,.05,.0,.0,.0,.0,.0,.0,.0};
   Double_t exhd[n] = {.0,.0,.0,.0,.0,.0,.0,.0,.0,.0};
   Double_t eyhd[n] = {.0,.0,.0,.0,.0,.0,.0,.0,.05,.0};
   gr = new TGraphBentErrors(n,x,y,exl,exh,eyl,eyh,exld,exhd,eyld,eyhd);
   gr->SetTitle("TGraphBentErrors Example");
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(21);
   gr->Draw("ALP");
}
TGraphBentErrors()
 TGraphBentErrors default constructor.
TGraphBentErrors(const TGraphBentErrors &gr)
 TGraphBentErrors copy constructor
TGraphBentErrors(Int_t n)
 TGraphBentErrors normal constructor.

  the arrays are preset to zero
TGraphBentErrors(Int_t n, const Float_t *x, const Float_t *y, const Float_t *exl, const Float_t *exh, const Float_t *eyl, const Float_t *eyh, const Float_t *exld, const Float_t *exhd, const Float_t *eyld, const Float_t *eyhd)
 TGraphBentErrors normal constructor.

 if exl,h or eyl,h are null, the corresponding arrays are preset to zero
TGraphBentErrors(Int_t n, const Double_t *x, const Double_t *y, const Double_t *exl, const Double_t *exh, const Double_t *eyl, const Double_t *eyh, const Double_t *exld, const Double_t *exhd, const Double_t *eyld, const Double_t *eyhd)
 TGraphBentErrors normal constructor.

 if exl,h or eyl,h are null, the corresponding arrays are preset to zero
~TGraphBentErrors()
 TGraphBentErrors default destructor.
void Apply(TF1 *f)
 apply a function to all data points
 y = f(x,y)

 Errors are calculated as eyh = f(x,y+eyh)-f(x,y) and
 eyl = f(x,y)-f(x,y-eyl)

 Special treatment has to be applied for the functions where the
 role of "up" and "down" is reversed.
 function suggested/implemented by Miroslav Helbich <helbich@mail.desy.de>
void ComputeRange(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax)
 Compute range.
void CopyAndRelease(Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin)
 Copy and release.
Bool_t CopyPoints(Double_t **arrays, Int_t ibegin, Int_t iend, Int_t obegin)
 Copy errors from fE*** to arrays[***]
 or to f*** Copy points.
Bool_t CtorAllocate(void)
 Should be called from ctors after fNpoints has been set
Double_t GetErrorX(Int_t i)
 This function is called by GraphFitChisquare.
 It returns the error along X at point i.
Double_t GetErrorY(Int_t i)
 This function is called by GraphFitChisquare.
 It returns the error along Y at point i.
Double_t GetErrorXhigh(Int_t i)
 Get high error on X[i].
Double_t GetErrorXlow(Int_t i)
 Get low error on X[i].
Double_t GetErrorYhigh(Int_t i)
 Get high error on Y[i].
Double_t GetErrorYlow(Int_t i)
 Get low error on Y[i].
void FillZero(Int_t begin, Int_t end, Bool_t from_ctor)
 Set zero values for point arrays in the range [begin, end)
void Paint(Option_t *option)
 Paint this TGraphBentErrors 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.
 if option "2" is specified error rectangles are drawn.

 if option "3" is specified a filled area is drawn through the end points >
 the vertical error bars.

 if option "4" is specified a smoothed filled area is drawn through the end
 points of the vertical error bars.
void Print(Option_t *)
 Print graph and errors values.
void SavePrimitive(ostream &out, Option_t *option /*= ""*/)
 Save primitive as a C++ statement(s) on output stream out
void SetPointError(Double_t exl, Double_t exh, Double_t eyl, Double_t eyh)
 Set ex and ey values for point pointed by the mouse.
void SetPointError(Int_t i, Double_t exl, Double_t exh, Double_t eyl, Double_t eyh)
 Set ex and ey values for point number i.
void SwapPoints(Int_t pos1, Int_t pos2)
 Swap points.



Double_t** Allocate(Int_t size)







Author: Dave Morrison 30/06/2003

Last update: root/graf:$Name:  $:$Id: TGraphBentErrors.cxx,v 1.19 2006/07/03 16:10:45 brun Exp $

Copyright  (C) 1995-2003, Rene Brun and Fons Rademakers.               *









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