Setting bins TH2F does not work properly in Draw method

ROOT
1

Hi all,
a simple question… I am unable to set correctly the X-Yaxis binning when trying to plot such thing:

mytree->Draw(“varx:3:varz>>histo1(10,0,10000,8,0,9,400,0,384)”,"",“hcolz”);

It seems that the binning over X=8,Y=400 and Z=10 are ignored… is there a way to achieve that?

2

If i do the following with the ntuple generated by: root.cern.ch/doc/master/hsimple_8C.html
it works fine.

ntuple->Draw("px:py:pz>>h3(10,-10,10,10,-100,100,10,-1000,1000)");
3

Why with ntuple works and TTree not?

4

I think there is a typo in your expression, what does “hcolz” mean? Try with “box”, or leave it unspecified.

And why do you plot a “3” in the y axis? (varx:3:varz)

Also, the binning x=8 does not match with your definition of histo1(10, …), you mixed the position.

5

thanks for your clarification!