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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