[ROOT] Chain projection

From: Ciro Bigongiari (ciro.bigongiari@pd.infn.it)
Date: Fri Feb 28 2003 - 13:19:37 MET


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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