When using TAxis::SetRange, you have to specify 2 arguments binmin and binmax.
Example:
{
TH1F h("h","test",100,-4,4);
h.FillRandom("gaus",10000);
h.GetXaxis()->SetRange(50,80);
h.Draw();
}
Rene Brun
Junjie Zhu wrote:
>
> Hi,
> I draw a histogram, but the range of x axis is too broad, so I want to
> change it to a certain range. I tried the command
> f->GetXaxis()->SetRange(), but it did not work.
>
> TPad *p=new TPad("p","pad",.1,.1,1.,1.);
> Global->Draw("pt") //draw a histogram of a transverve momentum
> but the default range of pt is -30 to 30, I am only interested in the
> range from 0 to 20, how can I change it? By the way,I do not want to use
> the definition of histogram TH1F *h=new TH1F("h","histogram",100,0.,20.)
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