Hi the experts, First that's going be a very very basic question. I had a look at various examples around but I am stuck and frustrated. (I am started at Root) What I would like to do is a little simple script to take a number and then plot the histogram corresponding to this number Here is what I do: #include <iostream.h> int show(Int_t nb) { gROOT->Reset(); c1 = new TCanvas("mapmt","MAPMTs",10,40,800,600); TFile f("r99.root"); //TFile *f = new TFILE("r99.root"); gPad->SetLogy(); TH1F *boundary = new TH1F("boundary","Channel Signal",500,-0.5,250.5); h10->Draw("norm>>+boundary","pdid==0 && pixid==nb"); c1->Update(); //return 0; } so calling show(2) should draw the histogram cooresponding to pixid=2 when calling h10->Draw("norm>>+boundary","pdid==0 && pixid==nb"); where I put my variable nb. It obviously doesn't like it certainly because of the "". What is the correct declaration in this case ? Can anybody indicate me an example where this is used ? Also as running my script without nb, (with the number instead) works but the histogram shows up and then disappears... :( I read something about the heap.. (as my histogram boudary with my personnal boundaries is declared as new). Is it the case ? What can I do to let it stay ? Cheers. ------------------------------------------------------------ Reinhardt CHAMONAL The University of Edinburgh Dept. of Physics & Astronomy email: chamonal@ph.ed.ac.uk King's Buildings, JCMB, 5301 Mayfield Road phone: +44-131-650 5307 Edinburgh, EH9 3JZ web: http://www.ph.ed.ac.uk/~chamonal/ http://www.reuh.fr.st ------------------------------------------------------------
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