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Re: Bear Smear and Cross Sections [message #13922 is a reply to message #13920] Mon, 03 September 2012 16:54 Go to previous messageGo to previous message
Ingo Froehlich is currently offline  Ingo Froehlich
Messages: 167
Registered: March 2004
Location: IKF - Frankfurt
first-grade participant
From: *x-matter.uni-frankfurt.de
Could you upload the file Ntuple_EtaHist.root somewhere so that I can use it for testing?

My first naive assumption is that the granularity is not sufficient. Most of your slices in q have only 0.01 GeV difference. You would like to cover a range from 1.739 to 3.3268 GeV, thus a range of 1.5878 GeV. This means you need a grid of 158 grid points of the TF2 at least.

I just notices that the ROOT default value is 30!

Can you try a higher value e.g. "model->SetNpy(500)"? This can take much more computing time - the ROOT GetRandom2 algorithm is very inefficient.


--
Ingo Froehlich
IKF - University of Frankfurt
069-798-47027, FAX: -47024
 
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