Hi Cynthia, This problem had already been fixed (February 19) in version 3.05. See new code at: http://root.cern.ch/root/htmldoc/src/TH1.cxx.html#TH1:Multiply Rene Brun Cynthia Hadjidakis wrote: > > Hello rooters, > > I would like to use the TH1 function Multiply(TF1* f1, Double_t c1 = 1) > with c1 different from 1. However looking more carefully at the function > in the program > (http://root.cern.ch/root/html304/src/TH1.cxx.html#TH1:Multiply), it > appears that the error is not scaled by the factor c1. > > That leads to obtain different error calculation on a histogram h when > using: > > 1. h.Multiply(f1,c1); > 2. h.Scale(c1); h.Multiply(f1,1); > > According to me, we should find the same errors. Is there a mistake or > something I do not understand? > > Thanks, > Cynthia > > ps : I use the 3.03.09 ROOT version
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