Giuseppe, create the histogram first, TH1F hist( "hist", "My histogram", 20, 0, 100 ); and then "pipe" the data into that, tree.Draw( "x>>hist", "x>0" ); Sven On Mittwoch, Oktober 31, 2001, at 04:04 Uhr, Giuseppe Lo Re wrote: > Hi people, > using a line like > tree.Draw("x>>h1","x>0") > Draw produces an histogram h1. > How can I set the bin number and the limits? > Thanks, > Giuseppe
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