[ROOT] Drawing multiple times to same temp histogram

From: Vuko Brigljevic (vuko@SLAC.stanford.edu)
Date: Tue Mar 26 2002 - 21:10:05 MET 

Hi all,

The following is done using root 3.02/07 on SunOS,
I see the same problem on Linux.

I am trying to use the same 2D histo several times in a row
as output of a Tree->Draw() and I am crashing. The code:


  TH2F *srhistos[10];
  
  int ilay;
  for (ilay=0; ilay<4; ilay++) {
    t1->Draw(scalerName(ilay+1)+":time >> srhist",cutString);
    srhistos[ilay]= new TH2F(*srhist);
    srhistos[ilay]->GetXaxis()->SetTimeDisplay(1);  
    srhistos[ilay]->GetXaxis()->SetTimeFormat("%d/%m");  
    srhistos[ilay]->Draw();
    gPad->SaveAs(TString(prefix+"singles-layer"+ilay+".eps"));  
    //    srhist.Reset();     tried this as well: does not help
    delete srhist;
  }

Whether I am deleting the temporary histogram (srhist),
resetting it or doing neither of both, I am always
crashing with the following output:

Info in <TPad::Print>: PostScript file lastDays/singles-layer1.eps has
been created

 *** Break *** segmentation violation
Root > Function makePlots() busy flag cleared
Function doPlots() busy flag cleared

How am I supposed to do something like that?

Thanks for any help!

Vuko


========================================================================
 Vuko Brigljevic                        | Mail : SLAC, Mail Stop 41
 Lawrence Livermore National Laboratory |        P.O. Box 4349, Stanford
 Nuclear and Particle Physics Division  |        CA 94309, USA
                                        | SLAC-Office : B280- room 143
 Member of the BaBar Collaboration      | Phone : +1-650-926 8512
 <vuko@slac.stanford.edu>          <http://www.slac.stanford.edu/~vuko>  
========================================================================

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