Problem with Project

ROOT
1

Hello,
I have a problem with Project function of TTree.
I am trying to project something into a histogram but it does not work: window which is open is empty.
This is my code

[code]#include <TFile.h>
#include <TTree.h>
#include <TH1F.h>
#include <TGraph.h>

#include
#include

using namespace std;

TH1F *hspider;

int check_normalisation(int Brhoref)
{
int i=0;
char text[50];
char varexp[20];
char selection[100];

int RunNb=0;
int Nspider=0, Nvamos=0;

TTree *Analysed_Data;

sprintf(text,"/space/Brho%i.root",Brhoref);
TFile f = new TFile(text);
cout << text << " is open" << endl;
Analysed_Data = (TTree)f->Get(“Analysed_Data”);
hspider = new TH1F(“hspider”,“hspider”,500,0.,140.);
Analysed_Data->Project(“hspider”,“SEc”,"(1/norm_transfer)*(GATCONF==1 && RUN_NUMBER==338)","");
hspider->Draw();
}[/code]
Canvas is empty. However, if I write

instead of

Analysed_Data->Project("hspider","SEc","(1/norm_transfer)*(GATCONF==1 && RUN_NUMBER==338)",""); hspider->Draw();

Could you explain me why it does not work?
Thanks.

2

I cannot reproduce this problem. Could you send the shortest possible running script?

Rene

3

If I write only this code, it works

[code]#include <TFile.h>
#include <TTree.h>
#include <TH1F.h>

TH1F *hspider;

int check_normalisation()
{
TTree Analysed_Data;
TFile f = new TFile("/space/Brho1055.root");
//cout << text << " is open" << endl;
Analysed_Data = (TTree)f->Get(“Analysed_Data”);
hspider = new TH1F(“hspider”,“hspider”,500,0.,140.);
Analysed_Data->Project(“hspider”,“SEc”,"(1/norm_transfer)(GATCONF==1 && RUN_NUMBER==338)","");
hspider->Draw();
return EXIT_SUCCESS;
}[/code]

I reintroduce progressively the remained code and now it works. I do not understand where was my error. Sorry for the inconvenience.