Hi Alexander, I suggest going via an histogram. This has the advantage that you can use all the TTree::Draw machinery, including selections. eg: ntuple.Draw("px","py>0","goff")' htemp->GetMean(); htemp->GetRMS(); Rene Brun On Tue, 21 Oct 2003, Aleksandar Mishev wrote: > > > Hi all > I have a ntuple (recording events of simulation > code)with the following structure > 1 ,2 , 3 and 4th raws are arrays of floats > 5th raw is float and last one is an array of floats. > OK reading the ntuple is simple but I m interesting if > in ROOT exists a comant or class that permits directly to obtain the mean > values and sigmas of all recoreded events > Cheers >
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