Hi Carmen,
The answer to your questions in the small example below
Rene Brun
void fitr() {
TCanvas *c1 = new TCanvas("c1");
gStyle->SetOptFit(111);
TH1F *h = new TH1F("h","h",100,-4,4);
h->FillRandom("gaus",10000);
h->Fit("gaus");
TF1 *f1 = h->GetFunction("gaus");
double mean = f1->GetParameter(1);
double sigma = f1->GetParameter(2);
f1->SetRange(mean-2.5*sigma,mean+2.5*sigma);
}
Carmen Iglesias wrote:
>
> Hello:
> I'm new using gaussian fit I have some doubts:
> 1. How I can see in my plot the value for mean and sigma(rms) of the fit?
> 2. How I can do the gaussian fit extended only for a determined number of
> sigma in each direction? (i.e. to do the Energy resolution with a
> Gaussian fit within 2.5 sigma interval from the peak value)
>
> Thanks
>
> Carmen,
>
> --
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> Carmen Iglesias Escudero
> INSTITUTO DE FÍSICA CORPUSCULAR (IFIC)
> Universidad de Valencia - CSIC
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