Re: [ROOT] Writing histograms in subdirectories

From: Rene Brun (Rene.Brun@cern.ch)
Date: Thu Aug 15 2002 - 11:12:33 MEST


Hi Gernot,

This problem had already been fixed in the CVS version.

Rene Brun

On Thu, 15 Aug 2002, Gernot Maier wrote:

> Hi rooters,
> 
> I have problems in reading histograms from a subdirectory of a file.
> 
> Execute for example the following test macro:
> 
> void test()
> {
>    TFile *fT = new TFile( "test.root" , "RECREATE" );
>    fT->mkdir( "AD" );
>    fT->cd( "AD" );
>    TH1D **his;
>    his = new TH1D*[20];
>    char hisname[100];
>    for( int i = 0; i < 20; i++ )
>    {
>       sprintf( hisname, "his_%d", i );
>       his[i] = new TH1D( hisname, hisname, 100., -10., 10. );
>       for( int j = 0; j < 100; j++ ) his[i]->Fill( gRandom->Gaus() );
>    }
>    for( int i = 0; i < 20; i++ )
>    {
>       his[i]->Write();
>    }
> }
> 
> If I open the test.root and change the directory with file->cd("AD") I get
> to following error messages:
> 
> Error in <TObjArray::At>: index -20454 out of bounds (size: 13, this: 0x0882d690)
> Error in <TObjArray::AddAt>: out of bounds at -20454 in 882d690
> Error in <TBuffer::CheckByteCount>: object of class TUUID read too few bytes: 18 instead of 195839724
> Warning in <TBuffer::CheckByteCount>: TUUID::Streamer() not in sync with data on file, fix Streamer()
> 
> I obtain similar error messages while switching to a subdirectory in a root file,
> which was converted by h2root and has about 1000 histograms in that subdirectory.
> 
> I'm using version 3.03/07 on linux and version 3.03/07 on alpha.
> 
> thank you,
> 
> Gernot
> 
> -----
> Gernot Maier                    KASCADE Collaboration
> Institut fuer Kernphysik        Tel. +49 (0) 7247 82-4174
> Forschungszentrum Karlsruhe     gernot.maier@ik.fzk.de
> 



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