RE: [Brahms-dev-l] root error

On Fri, 30 Apr 2004, Johnson, Erik B wrote:

> Bjorn,
>   Thanks for the info.  Here is what I'm doing with the ntulpe.  I fill
>   it in a module.
>
>

Aye, I think I've seen this before. What happens is that you open an
ntuple in some unspecified place in ROOTs directory structure, i.e. not
linked to a file. Then, when the tree goes over some size, it tries to
write itself to file but doesn't know which file to write to. The fix, at
least for me, was to do the following:

MyClass::Begin() {

	f = new TFile();
        f->cd();
	nt = new TNtuple();

}

MyClass::Event() {
  	nt->Fill();
}

MyClass::Finish() {

	f->cd();
	nt->Write();
	f->Close();
}

I.e. the same as you do, just in a different order. Try it and see :-)


--
Bjorn H. Samset                           Phone: 22856465/92051998
PhD student, heavy ion physics            Adr:   Schouterrassen 6
Inst. of Physics, University of Oslo             0573 Oslo
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