    // @(#)root/graf:$Name:  $:$Id: TGraphErrors.cxx,v 1.49 2005/06/13 10:10:29 brun Exp $
    // Author: Rene Brun   15/09/96

    /*************************************************************************
     * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
     * All rights reserved.                                                  *
     *                                                                       *
     * For the licensing terms see $ROOTSYS/LICENSE.                         *
     * For the list of contributors see $ROOTSYS/README/CREDITS.             *
     *************************************************************************/

    #include <string.h>

    #include "Riostream.h"
    #include "TROOT.h"
    #include "TGraphErrors.h"
    #include "TStyle.h"
    #include "TMath.h"
    #include "TArrow.h"
    #include "TBox.h"
    #include "TVirtualPad.h"
    #include "TF1.h"
    #include "TVector.h"
    #include "TVectorD.h"
    #include "TStyle.h"

    ClassImp(TGraphErrors)

    //______________________________________________________________________________
    //
    //   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::TGraphErrors(): TGraph() { //*-*-*-*-*-*-*-*-*-*-*TGraphErrors default constructor*-*-*-*-*-*-*-*-*-*-*-* //*-* ================================ CtorAllocate(); } //______________________________________________________________________________ TGraphErrors::TGraphErrors(Int_t n) : TGraph(n) { //*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-* //*-* =============================== // // the arrays are preset to zero if (!CtorAllocate()) return; FillZero(0, fNpoints); } //______________________________________________________________________________ TGraphErrors::TGraphErrors(Int_t n, const Float_t *x, const Float_t *y, const Float_t *ex, const Float_t *ey) : TGraph(n,x,y) { //*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-* //*-* =============================== // // if ex or ey are null, the corresponding arrays are preset to zero if (!CtorAllocate()) return; for (Int_t i=0;i<n;i++) { if (ex) fEX[i] = ex[i]; else fEX[i] = 0; if (ey) fEY[i] = ey[i]; else fEY[i] = 0; } } //______________________________________________________________________________ TGraphErrors::TGraphErrors(Int_t n, const Double_t *x, const Double_t *y, const Double_t *ex, const Double_t *ey) : TGraph(n,x,y) { //*-*-*-*-*-*-*-*-*-*-*TGraphErrors normal constructor*-*-*-*-*-*-*-*-*-*-*-*-* //*-* =============================== // // if ex or ey are null, the corresponding arrays are preset to zero if (!CtorAllocate()) return; n = sizeof(Double_t)*fNpoints; if (ex) memcpy(fEX, ex, n); else memset(fEX, 0, n); if (ey) memcpy(fEY, ey, n); else memset(fEY, 0, n); } //______________________________________________________________________________ TGraphErrors::TGraphErrors(const TVector &vx, const TVector &vy, const TVector &vex, const TVector &vey) :TGraph() { // 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. fNpoints = TMath::Min(vx.GetNrows(), vy.GetNrows()); if (!TGraph::CtorAllocate()) return; if (!CtorAllocate()) return; for (Int_t i=0; i < fNpoints; i++) { fX[i] = vx(i); fY[i] = vy(i); fEX[i] = vex(i); fEY[i] = vey(i); } } //______________________________________________________________________________ TGraphErrors::TGraphErrors(const TVectorD &vx, const TVectorD &vy, const TVectorD &vex, const TVectorD &vey) :TGraph() { // 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. fNpoints = TMath::Min(vx.GetNrows(), vy.GetNrows()); if (!TGraph::CtorAllocate()) return; if (!CtorAllocate()) return; for (Int_t i=0; i < fNpoints; i++) { fX[i] = vx(i); fY[i] = vy(i); fEX[i] = vex(i); fEY[i] = vey(i); } } //______________________________________________________________________________ TGraphErrors::TGraphErrors(const TGraphErrors &gr) : TGraph(gr) { // TGraphErrors copy constructor if (!CtorAllocate()) return; Int_t n = sizeof(Double_t)*fNpoints; memcpy(fEX, gr.fEX, n); memcpy(fEY, gr.fEY, n); } //______________________________________________________________________________ TGraphErrors::TGraphErrors(const TH1 *h) : TGraph(h) { // TGraphErrors constructor importing its parameters from the TH1 object passed as argument if (!CtorAllocate()) return; for (Int_t i=0;i<fNpoints;i++) { fEX[i] = h->GetBinWidth(i+1)*gStyle->GetErrorX(); fEY[i] = h->GetBinError(i+1); } } //______________________________________________________________________________ TGraphErrors::TGraphErrors(const char *filename, const char *format, Option_t *) : TGraph(100) { // GraphErrors constructor reading input from filename // filename is assumed to contain at least 3 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 CtorAllocate(); Double_t x,y,ex,ey; FILE *fp = fopen(filename,"r"); if (!fp) { MakeZombie(); Error("TGrapherrors", "Cannot open file: %s, TGraphErrors is Zombie",filename); return; } // count number of columns in format Int_t ncol = CalculateScanfFields(format); char line[80]; Int_t np = 0; while (fgets(line,80,fp)) { ex=ey=0; Int_t res; if (ncol < 3) { res = sscanf(&line[0],format,&x, &y); } else if(ncol <4) { res = sscanf(&line[0],format,&x, &y, &ey); } else { res = sscanf(&line[0],format,&x, &y, &ex, &ey); } if (res < 2) { // not a data line continue; } SetPoint(np,x,y); SetPointError(np,ex,ey); np++; } Set(np); fclose(fp); } //______________________________________________________________________________ TGraphErrors::~TGraphErrors() { //*-*-*-*-*-*-*-*-*-*-*TGraphErrors default destructor*-*-*-*-*-*-*-*-*-*-*-*-* //*-* =============================== delete [] fEX; delete [] fEY; } //______________________________________________________________________________ void TGraphErrors::Apply(TF1 *f) { // 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> Double_t x,y,ex,ey; for (Int_t i=0;i<GetN();i++) { GetPoint(i,x,y); ex=GetErrorX(i); ey=GetErrorY(i); SetPoint(i,x,f->Eval(x,y)); SetPointError(i,ex,TMath::Abs(f->Eval(x,y+ey) - f->Eval(x,y-ey))/2.); } } //______________________________________________________________________________ Int_t TGraphErrors::CalculateScanfFields(const char *fmt) { Int_t fields = 0; while ((fmt = strchr(fmt, '%'))) { Bool_t skip = kFALSE; while (*(++fmt)) { if ('[' == *fmt) { if (*++fmt && '^' == *fmt) ++fmt; // "%[^]a]" if (*++fmt && ']' == *fmt) ++fmt; // "%[]a]" or "%[^]a]" while (*fmt && *fmt != ']') ++fmt; if (!skip) ++fields; break; } if ('%' == *fmt) break; // %% literal % if ('*' == *fmt) { skip = kTRUE; // %*d -- skip a number } else if (strchr("dDiouxXxfegEscpn", *fmt)) { if (!skip) ++fields; break; } // skip modifiers & field width } } return fields; } //______________________________________________________________________________ void TGraphErrors::ComputeRange(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax) const { for (Int_t i=0;i<fNpoints;i++) { if (fX[i] -fEX[i] < xmin) { if (gPad && gPad->GetLogx()) { if (fEX[i] < fX[i]) xmin = fX[i]-fEX[i]; else xmin = TMath::Min(xmin,fX[i]/3); } else { xmin = fX[i]-fEX[i]; } } if (fX[i] +fEX[i] > xmax) xmax = fX[i]+fEX[i]; if (fY[i] -fEY[i] < ymin) { if (gPad && gPad->GetLogy()) { if (fEY[i] < fY[i]) ymin = fY[i]-fEY[i]; else ymin = TMath::Min(ymin,fY[i]/3); } else { ymin = fY[i]-fEY[i]; } } if (fY[i] +fEY[i] > ymax) ymax = fY[i]+fEY[i]; } } //______________________________________________________________________________ void TGraphErrors::CopyAndRelease(Double_t **newarrays, Int_t ibegin, Int_t iend, Int_t obegin) { CopyPoints(newarrays, ibegin, iend, obegin); if (newarrays) { delete[] fX; fX = newarrays[2]; delete[] fY; fY = newarrays[3]; delete[] fEX; fEX = newarrays[0]; delete[] fEY; fEY = newarrays[1]; delete[] newarrays; } } //______________________________________________________________________________ Bool_t TGraphErrors::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. Copy points. if (TGraph::CopyPoints(arrays ? arrays+2 : 0, ibegin, iend, obegin)) { Int_t n = (iend - ibegin)*sizeof(Double_t); if (arrays) { memmove(&arrays[0][obegin], &fEX[ibegin], n); memmove(&arrays[1][obegin], &fEY[ibegin], n); } else { memmove(&fEX[obegin], &fEX[ibegin], n); memmove(&fEY[obegin], &fEY[ibegin], n); } return kTRUE; } else { return kFALSE; } } //______________________________________________________________________________ Bool_t TGraphErrors::CtorAllocate() { if (!fNpoints) { fEX = fEY = 0; return kFALSE; } else { fEX = new Double_t[fMaxSize]; fEY = new Double_t[fMaxSize]; } return kTRUE; } //______________________________________________________________________________ void TGraphErrors::FillZero(Int_t begin, Int_t end, Bool_t from_ctor) { // Set zero values for point arrays in the range [begin, end) if (!from_ctor) { TGraph::FillZero(begin, end, from_ctor); } Int_t n = (end - begin)*sizeof(Double_t); memset(fEX + begin, 0, n); memset(fEY + begin, 0, n); } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorX(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along X at point i. if (i < 0 || i >= fNpoints) return -1; if (fEX) return fEX[i]; return -1; } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorY(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along Y at point i. if (i < 0 || i >= fNpoints) return -1; if (fEY) return fEY[i]; return -1; } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorXhigh(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along X at point i. if (i < 0 || i >= fNpoints) return -1; if (fEX) return fEX[i]; return -1; } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorXlow(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along X at point i. if (i < 0 || i >= fNpoints) return -1; if (fEX) return fEX[i]; return -1; } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorYhigh(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along X at point i. if (i < 0 || i >= fNpoints) return -1; if (fEY) return fEY[i]; return -1; } //______________________________________________________________________________ Double_t TGraphErrors::GetErrorYlow(Int_t i) const { // This function is called by GraphFitChisquare. // It returns the error along X at point i. if (i < 0 || i >= fNpoints) return -1; if (fEY) return fEY[i]; return -1; } //______________________________________________________________________________ void TGraphErrors::Paint(Option_t *option) { // 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. // // if option "2" is specified error rectangles are drawn. // // if option "3" is specified a filled area is drawn through the end points of // the vertical error bars. // // if option "4" is specified a smoothed filled area is drawn through the end // points of the vertical error bars. // // 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). Double_t *xline = 0; Double_t *yline = 0; Int_t if1 = 0; Int_t if2 = 0; const Int_t BASEMARKER=8; Double_t s2x, s2y, symbolsize, sbase; Double_t x, y, ex, ey, xl1, xl2, xr1, xr2, yup1, yup2, ylow1, ylow2, tx, ty; static Float_t cxx[11] = {1,1,0.6,0.6,1,1,0.6,0.5,1,0.6,0.6}; static Float_t cyy[11] = {1,1,1,1,1,1,1,1,1,0.5,0.6}; if (strchr(option,'X') || strchr(option,'x')) {TGraph::Paint(option); return;} Bool_t brackets = kFALSE; if (strstr(option,"[]")) brackets = kTRUE; Bool_t endLines = kTRUE; if (strchr(option,'z')) endLines = kFALSE; if (strchr(option,'Z')) endLines = kFALSE; const char *arrowOpt = 0; if (strchr(option,'>')) arrowOpt = ">"; if (strstr(option,"|>")) arrowOpt = "|>"; Bool_t axis = kFALSE; if (strchr(option,'a')) axis = kTRUE; if (strchr(option,'A')) axis = kTRUE; if (axis) TGraph::Paint(option); Bool_t option2 = kFALSE; Bool_t option3 = kFALSE; Bool_t option4 = kFALSE; if (strchr(option,'2')) option2 = kTRUE; if (strchr(option,'3')) option3 = kTRUE; if (strchr(option,'4')) {option3 = kTRUE; option4 = kTRUE;} if (option3) { xline = new Double_t[2*fNpoints]; yline = new Double_t[2*fNpoints]; if (!xline || !yline) { Error("Paint", "too many points, out of memory"); return; } if1 = 1; if2 = 2*fNpoints; } TAttLine::Modify(); TArrow arrow; arrow.SetLineWidth(GetLineWidth()); arrow.SetLineColor(GetLineColor()); arrow.SetFillColor(GetFillColor()); TBox box; box.SetLineWidth(GetLineWidth()); box.SetLineColor(GetLineColor()); box.SetFillColor(GetFillColor()); box.SetFillStyle(GetFillStyle()); symbolsize = GetMarkerSize(); sbase = symbolsize*BASEMARKER; Int_t mark = GetMarkerStyle(); Double_t cx = 0; Double_t cy = 0; if (mark >= 20 && mark < 31) { cx = cxx[mark-20]; cy = cyy[mark-20]; } //*-*- define the offset of the error bars due to the symbol size s2x = gPad->PixeltoX(Int_t(0.5*sbase)) - gPad->PixeltoX(0); s2y =-gPad->PixeltoY(Int_t(0.5*sbase)) + gPad->PixeltoY(0); Int_t dxend = Int_t(gStyle->GetEndErrorSize()); tx = gPad->PixeltoX(dxend) - gPad->PixeltoX(0); ty =-gPad->PixeltoY(dxend) + gPad->PixeltoY(0); Float_t asize = 0.6*symbolsize*BASEMARKER/gPad->GetWh(); gPad->SetBit(kClipFrame, TestBit(kClipFrame)); for (Int_t i=0;i<fNpoints;i++) { x = gPad->XtoPad(fX[i]); y = gPad->YtoPad(fY[i]); if (x < gPad->GetUxmin()) x = gPad->GetUxmin(); if (x > gPad->GetUxmax()) x = gPad->GetUxmax(); if (y < gPad->GetUymin()) y = gPad->GetUymin(); if (y > gPad->GetUymax()) y = gPad->GetUymax(); ex = fEX[i]; ey = fEY[i]; // draw the error rectangles if (option2) { box.PaintBox(gPad->XtoPad(fX[i] - ex), gPad->YtoPad(fY[i] - ey), gPad->XtoPad(fX[i] + ex), gPad->YtoPad(fY[i] + ey)); continue; } // keep points for fill area drawing if (option3) { xline[if1-1] = x; xline[if2-1] = x; yline[if1-1] = gPad->YtoPad(fY[i] + ey); yline[if2-1] = gPad->YtoPad(fY[i] - ey); if1++; if2--; continue; } xl1 = x - s2x*cx; xl2 = gPad->XtoPad(fX[i] - ex); if (xl1 > xl2) { if (arrowOpt) { arrow.PaintArrow(xl1,y,xl2,y,asize,arrowOpt); } else { if (!brackets) gPad->PaintLine(xl1,y,xl2,y); if (endLines) gPad->PaintLine(xl2,y-ty,xl2,y+ty); } } xr1 = x + s2x*cx; xr2 = gPad->XtoPad(fX[i] + ex); if (xr1 < xr2) { if (arrowOpt) { arrow.PaintArrow(xr1,y,xr2,y,asize,arrowOpt); } else { if (!brackets) gPad->PaintLine(xr1,y,xr2,y); if (endLines) gPad->PaintLine(xr2,y-ty,xr2,y+ty); } } yup1 = y + s2y*cy; yup2 = gPad->YtoPad(fY[i] + ey); if (yup2 > gPad->GetUymax()) yup2 = gPad->GetUymax(); if (yup2 > yup1) { if (arrowOpt) { arrow.PaintArrow(x,yup1,x,yup2,asize,arrowOpt); } else { if (!brackets) gPad->PaintLine(x,yup1,x,yup2); if (endLines) gPad->PaintLine(x-tx,yup2,x+tx,yup2); } } ylow1 = y - s2y*cy; ylow2 = gPad->YtoPad(fY[i] - ey); if (ylow2 < gPad->GetUymin()) ylow2 = gPad->GetUymin(); if (ylow2 < ylow1) { if (arrowOpt) { arrow.PaintArrow(x,ylow1,x,ylow2,asize,arrowOpt); } else { if (!brackets) gPad->PaintLine(x,ylow1,x,ylow2); if (endLines) gPad->PaintLine(x-tx,ylow2,x+tx,ylow2); } } } if (!brackets && !axis) TGraph::Paint(option); gPad->ResetBit(kClipFrame); if (option3) { Int_t logx = gPad->GetLogx(); Int_t logy = gPad->GetLogy(); gPad->SetLogx(0); gPad->SetLogy(0); if (option4) PaintGraph(2*fNpoints, xline, yline,"FC"); else PaintGraph(2*fNpoints, xline, yline,"F"); gPad->SetLogx(logx); gPad->SetLogy(logy); delete [] xline; delete [] yline; } } //______________________________________________________________________________ void TGraphErrors::Print(Option_t *) const { //*-*-*-*-*-*-*-*-*-*-*Print graph and errors values*-*-*-*-*-*-*-*-*-*-*-* //*-* ============================= // for (Int_t i=0;i<fNpoints;i++) { printf("x[%d]=%g, y[%d]=%g, ex[%d]=%g, ey[%d]=%g\n",i,fX[i],i,fY[i],i,fEX[i],i,fEY[i]); } } //______________________________________________________________________________ void TGraphErrors::SavePrimitive(ofstream &out, Option_t *option) { // Save primitive as a C++ statement(s) on output stream out char quote = '"'; out<<" "<<endl; if (gROOT->ClassSaved(TGraphErrors::Class())) { out<<" "; } else { out<<" TGraphErrors *"; } out<<"gre = new TGraphErrors("<<fNpoints<<");"<<endl; out<<" gre->SetName("<<quote<<GetName()<<quote<<");"<<endl; out<<" gre->SetTitle("<<quote<<GetTitle()<<quote<<");"<<endl; SaveFillAttributes(out,"gre",0,1001); SaveLineAttributes(out,"gre",1,1,1); SaveMarkerAttributes(out,"gre",1,1,1); for (Int_t i=0;i<fNpoints;i++) { out<<" gre->SetPoint("<<i<<","<<fX[i]<<","<<fY[i]<<");"<<endl; out<<" gre->SetPointError("<<i<<","<<fEX[i]<<","<<fEY[i]<<");"<<endl; } static Int_t frameNumber = 0; if (fHistogram) { frameNumber++; TString hname = fHistogram->GetName(); hname += frameNumber; fHistogram->SetName(hname.Data()); fHistogram->SavePrimitive(out,"nodraw"); out<<" gre->SetHistogram("<<fHistogram->GetName()<<");"<<endl; out<<" "<<endl; } // save list of functions TIter next(fFunctions); TObject *obj; while ((obj=next())) { obj->SavePrimitive(out,"nodraw"); out<<" gre->GetListOfFunctions()->Add("<<obj->GetName()<<");"<<endl; if (obj->InheritsFrom("TPaveStats")) { out<<" ptstats->SetParent(gre->GetListOfFunctions());"<<endl; } } if (strstr(option,"multigraph")) { out<<" multigraph->Add(gre);"<<endl; return; } out<<" gre->Draw(" <<quote<<option<<quote<<");"<<endl; } //______________________________________________________________________________ void TGraphErrors::SetPointError(Double_t ex, Double_t ey) { //*-*-*-*-*-*-*Set ex and ey values for point pointed by the mouse*-*-*-* //*-* =================================================== Int_t px = gPad->GetEventX(); Int_t py = gPad->GetEventY(); //localize point to be deleted Int_t ipoint = -2; Int_t i; // start with a small window (in case the mouse is very close to one point) for (i=0;i<fNpoints;i++) { Int_t dpx = px - gPad->XtoAbsPixel(gPad->XtoPad(fX[i])); Int_t dpy = py - gPad->YtoAbsPixel(gPad->YtoPad(fY[i])); if (dpx*dpx+dpy*dpy < 25) {ipoint = i; break;} } if (ipoint == -2) return; fEX[ipoint] = ex; fEY[ipoint] = ey; gPad->Modified(); } //______________________________________________________________________________ void TGraphErrors::SetPointError(Int_t i, Double_t ex, Double_t ey) { //*-*-*-*-*-*-*-*-*-*-*Set ex and ey values for point number i*-*-*-*-*-*-*-* //*-* ======================================= if (i < 0) return; if (i >= fNpoints) { // re-allocate the object TGraphErrors::SetPoint(i,0,0); } fEX[i] = ex; fEY[i] = ey; } //______________________________________________________________________________ void TGraphErrors::Streamer(TBuffer &b) { // Stream an object of class TGraphErrors. if (b.IsReading()) { UInt_t R__s, R__c; Version_t R__v = b.ReadVersion(&R__s, &R__c); if (R__v > 2) { TGraphErrors::Class()->ReadBuffer(b, this, R__v, R__s, R__c); return; } //====process old versions before automatic schema evolution TGraph::Streamer(b); fEX = new Double_t[fNpoints]; fEY = new Double_t[fNpoints]; if (R__v < 2) { Float_t *ex = new Float_t[fNpoints]; Float_t *ey = new Float_t[fNpoints]; b.ReadFastArray(ex,fNpoints); b.ReadFastArray(ey,fNpoints); for (Int_t i=0;i<fNpoints;i++) { fEX[i] = ex[i]; fEY[i] = ey[i]; } delete [] ey; delete [] ex; } else { b.ReadFastArray(fEX,fNpoints); b.ReadFastArray(fEY,fNpoints); } b.CheckByteCount(R__s, R__c, TGraphErrors::IsA()); //====end of old versions } else { TGraphErrors::Class()->WriteBuffer(b,this); } } //______________________________________________________________________________ void TGraphErrors::SwapPoints(Int_t pos1, Int_t pos2) { SwapValues(fEX, pos1, pos2); SwapValues(fEY, pos1, pos2); TGraph::SwapPoints(pos1, pos2); }