Hi all, I have the following problem: I am trying to write a macro which reads a root ntuble file and creates some histograms. When I compile an execute the scripts the histograms are always empty. I know this has something to do with the fact that after the program finishes the histo go out of scope, but I dont know how to fix it. I need (a want to) compile because I am using things like std::vector aso. The ntuple looks ok when I check it with TBrowser. Thanks in advance Andi Heres how I try to do it: // Standard Includes #include "TFile.h" ... void printHistos(void) { TFile f( ... right path to the file ... ); t = (TTree*)f.Get("t3333"); std::vector<TH1F*>* myHistos = new std::vector<TH1F*>; std::vector<TString> histoTitles; histoTitles.push_back("d0"); histoTitles.push_back("z0"); TCanvas* canv = new TCanvas("m_canv", "Track Plots", 200, 200, 700,320); canv->Divide(5,2); t->Draw("Trk_d0>>h1(100,-3.,3.)","",""); myHistos->push_back((TH1F*)gDirectory->Get("h1")); t->Draw("Trk_z0>>h2(100,-3.,3.)","",""); myHistos->push_back((TH1F*)gDirectory->Get("h2")); int count = 1; for (std::vector<TH1F>::iterator fz = myHistos->begin(); fz != myHistos->end(); ++fz) { canv->cd(count); (*fz).Draw(); ++count; } } -- ======================================================================= Andreas Wildauer CERN/PH ATC, mailbox E25310, CH-1211 Geneva 23, Switzerland office 40 3-D06 email Andreas.Wildauer@cern.ch tel +41 22 76 71779 =======================================================================
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