Hi Stanislas, Thanks for reporting this case with TH2::ProjectionX,Y. The problem is now fixed in the CVS version. Rene Brun On Tue, 10 Sep 2002, Stanislav NESTEROV wrote: > > Hi, Rene, > Again about PAW and ROOT compatibility... > Recently I made some projections of 2d-histogramms, and noticed that > in case of 2d-histogram with errors projected histograms in ROOT and PAW > have different errors. I think PAW makes error calculation in this > case more correctly than ROOT: ROOT actually calculates error bars without > any respect to errors in original 2d-histogramm. > > Projection in PAW made by: > PAW > prox 8399 > PAW > hi/proj 8399 > PAW > hi/pl 8399.prox > > Projection in ROOT made by: > > root [1] h8399->ProjectionX("_px",-1,-1,"e"); > root [2] h8399_px->Draw(); > > May be important: I've used 2d-histograms with errs, produced via HBOOK > package, then convert them into ROOT file by means of h2root utility. But > I've checked the code of H2ROOT and there're lines that convert 2d-errors > from PAW to ROOT... > > (ROOT-3.03/08 AFS-version for 7.2 redhat) > > Best regards, > Stanislav. >
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