On Wed, 12 Aug 1998, Rene Brun wrote:
> >2) Is it possible to write TGraph object into root file?
>
> Yes, this is possible, like for any TObject derived class.
> You can do:
> mygraph->Write("graphname"); // if graph has no name
> or
> mygraph->SetName("graphname");
> mygraph->Write();
>
> Rene Brun
>
>
Hello Rene,
Thank you for your answer, but it doesn't work for me.
Below is slightly modified gerrors.C, which produces root file with
1) in browser only info and error
root [0]
Processing gerrors.C...
root [1] Warning in <MakeDefCanvas>: creating a default canvas with name
inspect
Error in <TClass::GetMethod>:
Did not find matching TMethod <GetOption> with "" for TGraph
2) in interactive mode
root [0] TFile *fin=new TFile("graph.root")
root [1] gr->Draw()
only one line.
What happens with my graph or what I'm doing wrong?
I'm using ROOT v.2.00/10 under LInux RedHat 5.0.
// gerrors.C
{
gROOT->Reset();
TFile *fout=new TFile("graph.root","recreate");
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;
Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5,0.61,0.7,0.85,0.89,0.95};
Float_t y[n] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Float_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");
gr->Write("gr");
c1->Update();
delete fout;
}
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