Problem with passing color to histograms

[couet]

May be try :

h->Sumw2(0)

also see:

Statistical errors not propagated correctly

Hi, I don’t think is a bug. As written in the documentation of the static function TH1::SetDefaultSumw2(), root.cern.ch/doc/master/classTH … ed2ac153c2 [quote]all new histograms will automatically activate the storage of the sum of squares of errors [/quote] So this refers only for the new ones. You need to do : TH1::SetDefaultSumw2(1); TH1D *h=new TH1D("h","",10,0,10); or using the non-static member function Sumw() TH1D *h=new TH1D("h","",10,0,10); h->Sumw2(); Then you will get the corre…