Could I play toyMC sampling on a histogram?

smallorc · December 16, 2009, 12:08pm

Is it that I could only play toyMC with a defined PDF? I wonder if I only have a histogram without any known PDF, whether could I sample according to the shape of the histogram? If so, could anyone be kind to tell me the codes, please? Thanks so much!

Wouter_Verkerke · December 16, 2009, 12:31pm

Hi,

Conceptually this is always possible as long as the histogram has no negative entries.
Do you want to know how to do this in plain ROOT or in RooFit?

Wouter

smallorc · December 16, 2009, 1:23pm

Yes, could you tell me? Thanks so much.

brun · December 16, 2009, 2:46pm

use TH1::GetRandom, TH2::GetRandom, etc

Rene