Dear All, I have this problem in root 3.05/04. When I add two histograms the number of entries is not reported correctly. There is always an extra 81 added to the actual sum!! (See the example below) However, when the Event Status is displayed, the Sum is correctly reported. Also the problem goes away when the histograms are added one by one. ( root [25] a->Add(t_x1); ) This problem did not exist in 3.03/07. Any insight would be appreciated. Thank you! Muge =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= root [41] q1=t_x1->GetEntries(); Warning: Automatic variable q1 is allocated FILE:(tmpfile) LINE:1 root [42] q1 (double)7.80000000000000000e+01 root [43] q2=t_x2->GetEntries(); Warning: Automatic variable q2 is allocated FILE:(tmpfile) LINE:1 root [44] q2 (double)2.96000000000000000e+02 root [45] a->Reset(); root [46] a->Add(t_x1,t_x2); root [47] q3=a->GetEntries(); Warning: Automatic variable q3 is allocated FILE:(tmpfile) LINE:1 root [48] q3 (double)4.55000000000000000e+02 q1+q2=374 374+81=q3=455 (!!!???) ********************************************************** Muge Karagoz UNEL Dept. of Phys & Astro karagozm@nwu.edu Northwestern Univ 847 491 2811 NWU Evanston, IL 60208 630 840 3054 FNL ********************************************************** "So let us then try to climb the mountain, not by stepping on what is below us, but pulling us up at what is above us, for my part at the stars" M.C. ESCHER
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