William Love wrote: > > Root experts (Valery gave up) > > I am trying to dump two 2D arrays from an ntuple to two TH2F's so I > can subtract them. The arrays are 56X29 so I predefine the output arrays > > TH2F hv6("hv6","fooey",56,-0.5,55.5,29,-0.5,28.5) > > I then try to fill the array with > > ntb->Draw("index:irad>>hv6","bzme*(index<29 && iphi==9)","lego") > > If I inspect hv6 beforehand it is 56X29 as expected. After the fill > the array is 40X40 with the consequent mismatch of the binning and > the data. What am I doing wrong? I have the results of hv6.Dump() > both before and after the Draw if you want to look at them. > > Bill Love Hi Bill, A workaround is to draw the TH2F with the option "lego" before calling TTree::Draw and then use the option "same" in Draw. TH2F hv6("hv6",....); hv6.Draw("lego"); ntb->Draw("index:irad>>hv6","...","legosame") I will adapt the algorithm to be automatic. Rene Brun
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