Hi Ciro, I cannot reproduce this problem with the old version 3.02/07. Is chain.Draw("180.*fTheta/3.1415") featuring the same problem? I need more information like the result of chain.Print(). I also suggest to move to a more recent version such as 3.05/02 Rene Brun On Fri, 28 Feb 2003, Ciro Bigongiari wrote: > > > 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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