RE: [ROOT] .cxx and .c files: problems to save histograms

From: Philippe Canal (pcanal@fnal.gov)
Date: Wed Apr 03 2002 - 18:42:35 MEST 

Hi,

This problem is fixed in ROOT 3.03.03.  (See previous post on this subject).

Cheers,
Philippe.

-----Original Message-----
From: owner-roottalk@pcroot.cern.ch
[mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Reinhardt Chamonal
Sent: Wednesday, April 03, 2002 10:14 AM
To: roottalk@pcroot.cern.ch
Subject: [ROOT] .cxx and .c files: problems to save histograms


Hi,
I am having a "problem" to save my histogram in a root file.
I tried first on a dummy.CXX  macro inspired from the tutorial and it 
worked fine. When I decided to export it to my script.C macro it didn't 
work anymore on version 3.01/05 and even 3.02/07. But it worked on the 
older version 3.00/06.
I then decided to change my srcipt.c for a script.cxx name and turned out 
to work fine...
Is it due to some libraries which have to be included ? Or I am doing 
something fundamently wrong ?
Here is the full but not so long macro:

#include <iostream.h> 
Double_t tabCut[64];
Double_t tabSignal[64]={31,81,90,80,70,42,24,13,13,
  72,87,79,18,38,36,21,30,91,97,97,93,66,39,21,25,92,
  95,97,96,86,57,32,92,98,99,96,86,54,28,14,82,93,95,
  95,95,89,86,0,63,94,95,94,86,51,31,44,50,51,50,23,65,73,53,27};

void col(){
  Double_t tabcol[8];
  Double_t rowSignal=0;
  Double_t tabvalue;
  Int_t rowdiv=8;
  Int_t rownb=0;
  Int_t incr=0;
  c1 = new TCanvas("zdemo2","LED Cluster Shower on MAPMT",10,40,400,450);
  // ******************
  TFile *hfile = gROOT->FindObject("hsimple.root"); if (hfile) 
hfile->Close();
  hfile = new TFile("hsimple.root","RECREATE","Demo ROOT file with 
histograms");
  //********************
  hpx = new TH2F("hpx","Col population",100,0,9,100,0,0.4);
  gBenchmark->Start("hsimple"); 
  
  for (Int_t i=0;i<=7;i++){
    incr=i;
    for(Int_t j=0;j<=7;j++){
      cout << "tab["<<incr<<"]="<<tabSignal[incr]/100<<endl;
      tabvalue=(tabSignal[incr]/1000);
	
      // don't forget starting from 0 thus -1 to the channel
    if (incr==12 ||incr==18) {
      cout<<"cluster ignored"<<endl;
      rowdiv=7;
      tabvalue=0;
    }
    rowSignal+=tabvalue;
    incr+=8;
    }
    
  tabcol[rownb]=rowSignal/rowdiv;
  hpx->Fill(rownb+1,rowSignal);
  rowSignal=0;
  cout << "row["<<rownb<<"]="<<tabcol[rownb]<<" and div="<< rowdiv<<endl;
  rownb++;
  rowdiv=8;
  
  }

 gStyle->SetDateX(0.95); 
 gStyle->SetDateY(0.95); 
 gStyle->SetOptStat(0);
 gStyle->SetMarkerStyle(22);
 
 hpx->Draw();
 cout<<"watch out try to save everything"<<endl;
 gBenchmark->Show("hsimple");
 c1->Update();
 hfile->Write();  //************************
}


if someone could explain me the subtility here. 

Cheers

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