Hi rooters,
I tried to project a chain on a predefined histo without success.
Here is what I did:
{
gROOT->Reset();
// Create the chain as above
TChain chain("Events")
chain.Add("Pseudoelectron_0_0_7_1000to1009_w0.root");
chain.Add("Pseudoelectron_0_0_7_1130to1139_w0.root");
// Create an histogram
TH1F *helectron = new TH1F("helectron","Triggered electrons",50,0,5);
// Project the chain
chain.Draw("180.0*fTheta/3.1415 >>+ helectron ");
// Draw the histogram
helectron ->Draw();
}
The histogram I got seems to contain only the events in the second file.
My data are:
PC Pentium IV
Linux RedHat 7.2
ROOT Version 3.02/07 7 February 2003
What did I do wrong ?
Thanks a lot in advance.
Regards, ciro
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