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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