I plot a histogram from a TTree (made with h2root) of
an integer variable and ROOT picks bad bins. I tried to do
TH1 *hrows = new TH1("hrows","TPC rows",45,0.5, 45.5);
to set good bins and then
h10.Draw("row>>+hrows");
but I got
Warning in <TTree::Draw>: Deleting old histogram with different dimensions
and the same wrong-headed histogram. There seems to be no
TTree.SetBins method. You used to could do graph/hplot/null in
PAW and then draw on the premade plot. Must be able to do it
in ROOT?
Bill Love