Hello again, I found a strange feature while drawing 2D histograms : root [23] chain->Draw("f1e:f1de","","",10000); root [24] chain->Draw("f1e:f1de","","",10); root [25] chain->Draw("f1e:f1de>>hist","","",10000); root [26] chain->Draw("f1e:f1de>>hist","","",10); Lines [25] and [26] produce identical pictures where (visible) number of dots is the same for both figures, while Nent = 10 and 10000 in these two cases (also displayed in statistic box). Lines [23] and [24] work fine showing different number of scattered dots (as expected). Also I get into the same troubles if I call hist->Reset() for a 2D. It resets statistics but if I call root [27] hist->Draw() root [28] hist->Reset() root [29] hist->Draw() root [30] hist->Fill(10,10) (Int_t)43 root [31] hist->Draw() [27] displays a number of scattered dots, [29] displays a blank histogram, but [31] displays a number of dots ([27]) again. It looks like cells are not set to zero ... Did I miss something? This runs under root 2.21. Sorry, it's not updated to 2.22 by our sysadmin yet but I have not seen any reference to this feature in 2.22 development notes. Best regards, Anton
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