An example:
void com() {
TH1F *h = new TH1F("h","test",100,-4,4);
h->FillRandom("gaus",5000);
Double_t mean = h->GetMean();
Double_t rms = h->GetRMS();
char tmean[40];
char trms[40];
h->Draw();
//using normal text in world coordinates
sprintf(tmean,"mean = %g",mean);
sprintf(trms,"rms = %g",rms);
TText *t1 = new TText(-3,140,tmean);
t1->SetTextColor(kRed);
t1->SetTextSize(0.04);
t1->Draw();
//using normal text in NDC
TText *t2 = new TText(0.2,0.92,tmean);
t2->SetNDC();
t2->SetTextColor(kBlue);
t2->SetTextSize(0.04);
t2->Draw();
//Using a TPaveLabel
TPaveLabel *p = new TPaveLabel(0.6,0.7,0.8,0.76,trms,"brNDC");
p->Draw();
}
Rene Brun
Kai Yi wrote:
>
> Hi, All,
> I have a histogram, fitted with signal plus background, then I
> calculated the S/N, I want ot write this value from the vaiable into
> the histogram, anyone can tell me how to do that?
>
> Thanks a lot!
>
> Kai Yi
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