Hi HP,
Each branch must have its own address. It does not make sense
to share the same address between different branches.
The declaration
double var inside the loop cannot work.
Declare the variables that you intend to declare to branches
outside the loop.
I strongly suggest to read the Users Guide and in particular
the tutorials tree1,2,3,4.C
Rene Brun
On Fri, 13 Dec 2002, HP Wei wrote:
> I want to create a big tree with many branches.
> But I need to create one or several branches at a time.
> After the following pseudo-code (for one branch at at time)
> goes through i=0, then
> it produces Segmentation Fault at i=1 at TBranch *br statement.
>
> What should I do?
>
> ---------------------------------------------
> char sym[100];
> char symType[100];
> int N= 1000;
> int M= 2000;
>
> Open_root_file;
> TTree * tree = new TTree("S", "");
>
> for(int i=0; i<N; ++i) {
> double var;
> sprintf(sym, "field%d", i);
> sprintf(symType, "%s/D", sym);
> TBranch *br = tree->Branch(sym, &var, symType); // Segmentation Fault
>
> for (int k=0; k<M; ++k) {
> var = 1.0;
> br.Fill();
> }
>
> br->Write();
> tree->Delete(sym);
> }
>
> tree->Write();
> Save_the_root_file;
>
> ------------------------------------------------
> Thanks,
> HP
>
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