hi Glen - after you leave `sub' the variables px,py,pz etc... get deallocated so you're reading your data into nowhere... best, pasha Glen R. Salo wrote: > > (My apologies if this message appears twice.) > > The following macro demonstrates a problem I'm having with TTrees. As shown, > the scripts end with repeated *** Break *** segmentation violation statements. > The macro can be made to work as shown below. These solutions, however, are not > suitable for my application. Any hints as to why this problem is occurring will > be greatly appreciated. I'm running root 2.23.12 under RedHat linux 6.1. > > Thanks, > > Glen > > int main() { > > TFile f("hsimple.root"); > TNtuple *n = (TNtuple *)f.Get("ntuple"); > sub(n,0); // works if line is removed > // sub(n,n->GetEntries()); // works if above line is replaced with this one > > n->Scan("*","i<3"); > n->Scan("*","i<3"); > > return (0); > > } > > void sub(TTree *n, Int_t index) { > > Float_t px,py,pz,random; > Int_t i; > n->SetBranchStatus("*",kTRUE); > n->SetBranchAddress("px",&px); > n->SetBranchAddress("py",&py); > n->SetBranchAddress("pz",&pz); > n->SetBranchAddress("random",&random); > n->SetBranchAddress("i",&i); > > }
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