Hi Yannick, TProfile::ProjectionX returns a TH1D* not a TProfile* Functions like TProfile2D::ProfileX and TProfile2D::ProfileY could be implemented. Are volunteer to do the job? Rene Brun Patois Yannick wrote: > > Hi rooters, > > I have filled a TProfile2D with values. Now, I would like to get the > average of the value (z axis) on X axis. I expect to have something like > TProfile *TProfile2D::ProjectionX(); But TProjectionX returns a TH1D > that is (as far as I can see it) simply filled by sum of the value for > each bins, which is not consistant with the purpose of a profile > histogram. > > How can I do this (without messing with the internal of TProfile2D > geting values and weigth for each point and such) ? > > Yannick
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