Groff and TTree.Draw() in PyROOT

ROOT
1

I am trying to use the TTree.Draw() shortcut to fill a histogram, but the groof option does not seem to work (i.e. c1 gets created and displayed). Also, it takes about 10 seconds to load TH1,TTree,gDirectory, and TDateTime using
from ROOT import TH1,TTree,gDirectory, TDateTime; is that normal?

In [20]: tree.Draw('rodBCID>>hist','groff')
Error in <TTreeFormula::Compile>:  Bad numerical expression : "groff"
Out[20]: -1L

In [21]: tree.Draw('rodBCID>>hist',option='groff')
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1

In [23]: tree.Draw('rodBCID>>hist','','groff')
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
Out[23]: 10089L
2

Hi,

isn’t the option “goff” instead of “groff” or “groof”? I can find plenty of instances in the code of the former, none of the latter two.

Cheers,
Wim

3

Wow. I am embarrassed.
option= doesnt work, but why would it!
Thank a lot.

4

Hi,

keyword support is on the “TODO” list. :slight_smile:

Cheers,
Wim