Thanks I didn't think about this trick
On Mon, 18 Mar 2002, Rene Brun wrote:
> Hi Reinhardt,
>
> Modify your code as indicated below.
>
> Rene Brun
>
> Reinhardt Chamonal wrote:
> >
> > 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 = new TFile("r99.root"); //<================
> //use new, otherwise when closing the file, hist will be destroyed
> > //TFile *f = new TFILE("r99.root");
> > gPad->SetLogy();
> > TH1F *boundary = new TH1F("boundary","Channel Signal",500,-0.5,250.5);
> TString cut = "pdid==0 && pixid==";
> cut += nb;
> > h10->Draw("norm>>+boundary","cut);
> > 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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