Rooters I am trying to use in a loop the automatic binning feature of ntuple->Draw("x>>h1","selection") If I try to reuse h1 without deleting it the contents are replaced but the bins and limits are not recalculated which is no use. If I delete h1 before replacing it, new limits are computed but I get a segmentation violation. root [0] TFile f("straight3rd.root"); root [1] stks->Draw("z>>h1","z>28 && z<32"); Warning in <MakeDefCanvas>: creating a default canvas with name c1 root [2] h1->Print(); TH1.Print Name= h1, Total sum= 18409 root [3] h1->Delete(); root [4] stks->Draw("z>>h1","z>55 && z<60"); root [5] h1->Print(); *** Break *** segmentation violation Help? Bill Love
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