Chris Jillings wrote:
>
> Hi,
> I have many sets of x-y points that I would like to plot on the same
> graph. What is the command to pre-define the axes, plot a curve, and then
> plot a second?
> Just to be clear, I am looking for the root version of
>
> null 0. 15. 0. 1.
> ve/plo y1%x1 ! s
> ve/plo y2%xs ! s
>
I have added an example in the Tutorials (nr 17) at the URL:
http://root.cern.ch/root/Tutorials.html
The code is shown below.
Note that instead of using a TH2F to set the pad range, you can
use instead TPad::DrawFrame
Rene Brun
{
gROOT->Reset();
c1 = new TCanvas("c1","gerrors2",200,10,700,500);
c1->SetFillColor(42);
c1->SetGrid();
// create a 2-d histogram to define the range
TH2F *hr = new TH2F("hr","Several graphs in the same
pad",2,-0.4,1.2,2,0,12);
hr->SetXTitle("X title");
hr->SetYTitle("Y title");
hr->Draw();
c1->GetFrame()->SetFillColor(21);
c1->GetFrame()->SetBorderSize(12);
// create first graph
Int_t n1 = 10;
Float_t x1[] = {-0.22, 0.05, 0.25, 0.35, 0.5,
0.61,0.7,0.85,0.89,0.95};
Float_t y1[] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Float_t ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Float_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->Draw("LP");
// 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[] = {0.82,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
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->Draw("LP");
}
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