Hi Tommaso, You can produce a TProfile2D histogram with: tree->Draw("V:Y:X","","prof lego") Rene Brun Tommaso Chiarusi wrote: > > dear rooters, > > I have a TH2. > I want to re-weight each bin according to the average of a > variable with > respect to the number of elements contained in each bin. > > For example: if I have a tree with X Y and V leaves, > by > > tree->Draw("Y:X","V","lego"); > > I get a 3-D plot with for each bin, on the Z axis, the sum of the values > related variable V over all the elements which occur in such bin. > > Instead I would like to have an average of V for each bin. > > I noticed that it is possible to create a structure (an array) of the > square of the bins' content with > > TH1::Sumw2() > > Now, do exist an option that authomatically performs > what I want (by using somehow such weight-structure), or should I write it > by myself? > > Regards, > Tommaso
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