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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