Hi,
Use the TMultiGraph class as shown in the example below
Rene Brun
{
gROOT->Reset();
c1 = new TCanvas("c1","gerrors2",200,10,700,500);
c1->SetFillColor(42);
c1->SetGrid();
// draw a frame to define the range
TMultiGraph *mg = new TMultiGraph();
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderSize(12);
// create first graph
Int_t n1 = 10;
Double_t x1[] = {-0.1, 0.05, 0.25, 0.35, 0.5,
0.61,0.7,0.85,0.89,0.95};
Double_t y1[] = {-1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Double_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Double_t ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
gr1 = new TGraphErrors(n1,x1,y1,ex1,ey1);
gr1->SetMarkerColor(kBlue);
gr1->SetMarkerStyle(21);
gr1->Fit("pol6","q");
mg->Add(gr1);
// create second graph
Int_t n2 = 10;
Float_t x2[] = {-0.28, 0.005, 0.19, 0.29, 0.45,
0.56,0.65,0.80,0.90,1.01};
Float_t y2[] = {2.1,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
Float_t ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04};
Float_t ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7};
gr2 = new TGraphErrors(n2,x2,y2,ex2,ey2);
gr2->SetMarkerColor(kRed);
gr2->SetMarkerStyle(20);
gr2->Fit("pol5","q");
mg->Add(gr2);
mg->Draw("ap");
}
On Tue, 19 Nov 2002, payman hosseini wrote:
>
> hi
>
> i have writen a simple mfc program in windows that draws a set of dots and
> then it fits them
> i call this program several times, with several input files, to calcute
> the dots to be drawn
>
> how can i generate one output file(graph) will all three of the fits on
> it?
>
>
> thanks
>
> Paymon Hosseini
>
>
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