Hi Francesco, David, Mea culpa !! I realize that I have introduced by mistake a wrong version of TH2::ProjectionX,Y in the released version 3.03/09. The problem is fixed now in CVS. The problem appears in 3.03/09 if you project a TH2 for which the errors have been computed (TH2::Sumw2 called). If you have not set the errors, the projected errors are correct. Sorry for this unfortunate problem and thanks for reporting it. Rene Brun On Mon, 28 Oct 2002, Perfetto Francesco wrote: > > Hello, > Excuse me for re-e-mail bud I don't received answer. > I have the 3.02/06 version of root. > Now (for my analysis) I am using the TProjectionX method for TH2D histo. > In the mail of Nesterov: > > Date: Tue, 10 Sep 2002 13:07:37 +0200 (CEST) > From: Stanislav NESTEROV <Stanislav.Nesterov@cern.ch> > To: Rene Brun <Rene.Brun@cern.ch> > Cc: roottalk@pcroot.cern.ch > Subject: [ROOT] Different TH2 projection errors in ROOT and PAW > > I have read that ( perhaps ) TH2 projection errors are not calculated > exactly, now I would like to Know if in my version is all ok or I need to> > pass at 3.03/09 version and if in this version is all ok. > > Looking on the web ( under Classes and Members Reference Guide Development > version 3.03) the source of ProjectionX under TH2 class ( version 3.03 ) > I don't understand because the errors are calculated in this mode; > in my opinion the error calculated by ProjectionX ( Classes and Members > Reference Guide (pro version 3.02/07)) are correct. > I would like your opinion on this question ? > > > Best regards > Francesco. > > >
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