I can only repeat my original request. Send the piece of code where
you create/open/close ALL your Root files, fill the Tree, etc.
I remind you that filling a Tree may imply writing to a file!
In general a tree does not fit in memory.
Rene Brun
Matthieu Lechowski wrote:
>
> On Mon, 29 Sep 2003, Rene Brun wrote:
>
> > You should not do:
> >
> > TTree *TREE = new TTree(...)
> > TFile *myfile=new TFile(name_ntuple, "RECREATE");
> > ...
> > TREE->Write();
> >
> > but
> >
> > TFile *myfile=new TFile(name_ntuple, "RECREATE");
> > TTree *TREE = new TTree(...)
> > ...
>
> Yes but here I open a file of data, fill my Tree, and close the file,
> and after that TREE->Write(); doesn't work.
>
> > TREE->Write();
> >
> > Rene Brun
> >
> > Matthieu Lechowski wrote:
> > >
> > > Hello,
> > >
> > > It's not easy to have a simplified version of my code, but if it's
> > > necessary I will provide you.
> > >
> > > I understand why the 2nd solution did not work: actually, I have to
> > > open a second file where I get data to fill my Tree.
> > >
> > > So I have this order of instructions:
> > >
> > > TTree *TREE = new TTree(...)
> > > TFile *data_file = new TFile(name_data_file);
> > > //..fill tree
> > > data_file->Close();
> > >
> > > TFile *myfile=new TFile(name_ntuple, "RECREATE");
> > > TREE->Write();
> > > myfile->Close(); //"delete myfile;" doesn't work
> > >
> > > I just have changed the place of data_file->Close(). Indeed it was at
> > > the end, so when I tried to put "TFile *myfile=new ..." at the top as you
> > > said, of course the TREE->Write() wanted write in "data_file" instead of
> > > "myfile" (that's why I had the message "... not writable", I did not see
> > > that the message concerned "data_file" and not "myfile", sorry).
> > >
> > > But even placing data_file->Close() before writing the tree, it does not
> > > work when I put "TFile *myfile=new ..." at the top.
> > >
> > > ----
> > > In conclusion, I have to manage 2 files, and I want write a Tree in one
> > > of them. The instructions above work for small files, but not for big
> > > ones.
> > > Do you see where could be the problem ?
> > >
> > > Matthieu.
> > >
> > > On Mon, 29 Sep 2003, Rene Brun wrote:
> > >
> > > > I am afraid that we will not make any progress without looking at a simplified
> > > > version of your code reproducing this problem.
> > > >
> > > > Rene Brun
> > > >
> > > > Matthieu Lechowski wrote:
> > > > >
> > > > > Hello,
> > > > > Thanks, but unfortunately it doesn't work.
> > > > > The first solution doesn't change anything, and with the second ROOT
> > > > > tells me my file is not writable (Error in <TTree::Write>: File ... is
> > > > > not writable).
> > > > > Have you others ideas ?
> > > > > Thank you.
> > > > >
> > > > > Matthieu.
> > > > >
> > > > > On Fri, 26 Sep 2003, Rene Brun wrote:
> > > > >
> > > > > > Matthieu,
> > > > > >
> > > > > > This seems to be a problem with the destructor of your TTree when
> > > > > > you close the file.
> > > > > > You can try two solutions:
> > > > > > 1- after TREE.Write(); add the statement
> > > > > > TREE.SetFile(0);
> > > > > >
> > > > > > 2- Do not create your Tree in the stack, but in the heap with
> > > > > > TFile *myfile=new TFile(name_ntuple, "RECREATE");
> > > > > > TTree *TREE = new TTRee(...
> > > > > > //..fill tree
> > > > > > TREE->Write();
> > > > > > delete myfile; //do not delete TREE
> > > > > >
> > > > > > Rene Brun
> > > > > >
> > > > > > Matthieu Lechowski wrote:
> > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > ROOT leaves without saying anything when I try to write a TTree in a
> > > > > > > TFile, and the file has only few bytes (and can not be opened of
> > > > > > > course).
> > > > > > >
> > > > > > > I have a global tree: TTree TREE("T","TREE");
> > > > > > > In a function, I fill it, then:
> > > > > > > TFile *myfile=new TFile(name_ntuple, "RECREATE");
> > > > > > > TREE.Write();
> > > > > > > myfile->Close();
> > > > > > >
> > > > > > > This is the way I always used, and it always worked, but this time I
> > > > > > > have a big Tree and this doesn't work, I don't know why.
> > > > > > > Its size is less than the limit 2Gb, I think it should be around 80Mb
> > > > > > > with 100.000 entries (I have already a similar file of 8Mb with 10.000
> > > > > > > entries that I succeeded to write).
> > > > > > >
> > > > > > > Have you an idea of what goes wrong ?
> > > > > > > Thank you.
> > > > > > >
> > > > > > > Matthieu Lechowski
> > > > > > > LAL Orsay
> > > > > > >
> > > > > > > lxplus
> > > > > > > ROOTSYS=/afs/cern.ch/sw/root/v3.05.05/rh73_gcc2952/root
> > > > > >
> > > >
> >
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