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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