Reusing the automatic histogram

From: William Love (love@bnl.gov)
Date: Thu Apr 15 1999 - 23:12:25 MEST


   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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