Hi Giuseppe, To zoom an already filled histogram do: h->GetXaxis()->SetRange(binmin,binmax); where binmin,binmax are the lower and upper bin number. You can find the correspondance between axis values and bin numbers via TAxis::FindBin Rene Brun Giuseppe Lo Re wrote: > > Rene Brun wrote: > > > > Use h->GetXaxis()->SetLimits(xmin,xmax); > > > > Rene Brun > > > > Giuseppe Lo Re wrote: > > > > > > Hi Rooters, > > > I have defined an histogram bur now I want to change the x-axis limits. > > > How can I do? > > > Thanks for any help, > > > Giuseppe Lo Re > > I tried but h->GetXaxis()->SetLimits(xmin,xmax) acts only on the scale > while the histogram doesn't change.
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