renormalisation of a histogram

Dear roottalkers,

Let's consider we wish to renormalise a histogram to a given value (for example 1)

Up to now, i was using :

myhisto->Scale(1./myhisto->GetEntries());

but i just saw that a colleague was using something like : myhisto->Scale(1./myhisto->Integral());
and i'm suspecting (maybe i'm wrong) that this is not correct ?

Would you know what is the difference and what should be used ?

(for example, one wish to renormalise histogram of a given observable for the MC to the number of events of the data)

thank you Received on Sat Jan 30 2010 - 01:35:18 CET