Hi Marc-Andre, Marc-Andre Pleier wrote: > I just found out there seems to be a bug in ROOT when you subtract histograms: > Instead of subtracting the values in the stats array (sumw, sumwx), they are > added This is a known old "feature" of ROOT :-) http://root.cern.ch/root/roottalk/roottalk99/1883.html http://root.cern.ch/root/roottalk/roottalk01/2560.html Best regards, -- David D'ENTERRIA - Marie-Curie PostDoc Fellow - TAPS·PHENIX·ALICE Groupe Photons SUBATECH tel: +33 2 51 85 85 60 4, A. Kastler BP 20722 · 44307 Nantes fax: +33 2 51 85 84 24 http://www-subatech.in2p3.fr/~photons mailto:enterria@in2p3.fr --------------------------------------------------------------------- Phenix Group (Bld. 510C) Brookhaven National Lab. Upton, NY 11973, USA fax: +1 631 344 3253 http://www.phenix.bnl.gov/~enterria mailto:denterri@bnl.gov ---------------------------------------------------------------------
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