Dear ROOT folks: I'm working in ROOT Version 3.02/07 I'm stuck with the following situation - I have 2 files each with a TTree named 'uDst'. For simplicity, suppose each uDst tree has 3 variables in each event : variable1, variable2 and variable3. I'd like to open those two files in the same macro, and draw some histos. When drawing my histos I have some selection that I apply to TTrees. Here's a generic macro i'm talking about void mymacro() { TFile *f1 = new TFile("f1.root"); TTree *t1 = uDst; TH1F *hist1 = blah blah blah t1->Draw("variable3>>hist1","(abs(variable1)+abs(variable2))<5"); TFile *f2 = new TFile("f2.root"); TTree *t2 = uDst; TH1F *hist2 = blah blah blah t2->Draw("variable3>>hist2","(abs(variable1)+abs(variable2))<5"); } When the macro comes to line "t2->Draw .... " ROOT crashes with the message: *** Break *** segmentation violation Root > Function mymacro() busy flag cleared I've noticed that if I only try to open 1 file (either 1 or 2 ) in a macro, it all works. Oddly, it also works fine if I change my selection condition from (abs(variable1)+abs(variable2))<5 to just variable1<5 or variable2<5 but that's not the selection that I want ... What am I doing wrong ?? Thank you, Vladimir
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