Hi Alberto,
Difficult to come with a diagnostic without seeing your complete macro.
Did you try to replace fprintf by printf ?
Note that TF1::GetParameter returns a double.
Rene Brun
alberto Franzoso wrote:
>
> Hi everybody,
> we are trying to write a list of data on a file.
> We tried to launch "fprintf" from a Macro (automatically generated by
> ROOT(MakeClass), to make a loop on a Tree), as follows:
>
> TCanvas *FinA = new TCanvas("FinA","Energy per plane",1);
> FILE *sigmaf = fopen("sigma100.dat","w");
> Float_t sigma[18];
> for (Int_t i=1; i<=18; i++) {
> EnergyOnPlane[i]->SetMaximum(1200);
> EnergyOnPlane[i]->Draw();
> EnergyOnPlane[i]->Fit("gaus");
> sigma[i-1]=gaus->GetParameter(2);
> fprintf(sigmaf,"%f \n",sigma[i-1]); <<<-----???
> FinA->Update();
> char w = getchar();
> }
>
> The file is correctly created, but appears to be empty... Any idea why?
> Thanks,
> Alberto
>
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