Hi, I am not able to retrieve all the histograms I need from a TFile
using the macro shown below : the newly created histograms
are all empty, while the originals contained in the file are not .
The same instructions, typed interactively on a root session, work plainly and smoothly.
#include <TFile.h>
#include <TH1D.h>
TH1D *Signal, *data, *LightQuark, *Sequential ;
void Smear()
{
TFile f("EventMLP_Single.hist","UPDATE");
TH1D* data = (TH1D*) f.Get("hDt");
TH1D* sig = (TH1D*) f.Get("hSg");
TH1D* lq = (TH1D*) f.Get("hLq");
TH1D* seq = (TH1D*) f.Get("hSq");
data->Draw();
seq->Draw("same");
data->Add(seq,-1);
data->Draw();
data->Add(lq,-1);
data->Draw();
sig->Draw("same");
data->Draw();
sig->Draw("samehist");
sig->Draw("hist");
data->Draw("sameeror");
}