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 -- Alexander Mishev Ph. D. LIP Lisbon & CERN CMS PRS team
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