[ROOT] faster TF1::GetRandom()

From: Daniel De Marco (ddm@GE.INFN.IT)
Date: Wed Jan 15 2003 - 10:34:16 MET 

Hi All!

I'm using TF1::GetRandom() to get random numbers distributed as a blackbody
spectrum. I need random numbers above some threshold so I do:

f->SetRange(min, max);  // assume f is a TF1* properly declared
                        // min and max are the bounds for the random number
f->GetRandom();

In a previous version of my simulation program I was using the class
RandGeneral from CLHEP (with some minor modifications to allow setting
thresholds) and I found that the generation of these random numbers is 10
to 20 times slower using GetRandom. Do I do something wrong? There's a way
to speed up the generation?

Thanks in advance.
Ciao, Daniel.

--ddm

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