How to name x&y axis after to_hist a TH2F histogram

[ZhenxuanZhang-Jensen]

Suppose I just created a TH2F histogram and use to_hist() to make it a hist, and how can I name the x and y axis to different name?

import random
import uproot
from ROOT import TFile, TH2F

of = TFile("test_hist.root","RECREATE")
h1 = TH2F("h1","Histogram",100,-5,5,100,-5,5)
for i in range(100):
    x = random.uniform(-4.9,4.9)
    y = random.uniform(-4.9,4.9)
    h1.Fill(x,y)
of.Write()
of.Close()

hist = uproot.open("test_hist.root")
hist["h1"].to_hist().plot2d_full()

[henryiii]

You need to rename both at the same time, since that's the only way to verify the names are valid. Just do this:

h = hist["h1"].to_hist()
h.axes.name = ("x", "y")
h.plot2d_full()

[ZhenxuanZhang-Jensen]

is "2.5.1". I don't think I can update Hist but maybe I can find a newer source of python environment to use in lxplus.

[henryiii]

How are you setting up Python on lxplus?

[ZhenxuanZhang-Jensen]

I use source /cvmfs/sft.cern.ch/lcg/views/dev4cuda/latest/x86_64-centos7-gcc8-opt/setup.sh this command

[henryiii]

The full error is:

Traceback (most recent call last):
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/boost_histogram/_internal/axestuple.py", line 101, in __setattr__
    return super().__setattr__(attr, values)
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/hist/axestuple.py", line 63, in name
    for ax, val in zip(self, values, strict=True):
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/hist/axestuple.py", line 17, in zip
    return more_itertools.zip_equal(*iterables)
AttributeError: module 'more_itertools' has no attribute 'zip_equal'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "tmpl.py", line 17, in <module>
    h.axes.name = ("x", "y")
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/boost_histogram/_internal/axestuple.py", line 103, in __setattr__
    self.__class__(s.__setattr__(attr, v) for s, v in zip_strict(self, values))
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/boost_histogram/_internal/axestuple.py", line 103, in <genexpr>
    self.__class__(s.__setattr__(attr, v) for s, v in zip_strict(self, values))
  File "/cvmfs/sft-nightlies.cern.ch/lcg/views/dev4cuda/Thu/x86_64-centos7-gcc8-opt/lib/python3.8/site-packages/boost_histogram/_internal/axis.py", line 63, in __setattr__
    object.__setattr__(self, attr, value)
AttributeError: can't set attribute

The important error is the first one, not the second one. The problem is that CVMFS has an old more_itertools that doesn't have the zip_equal function. We could either ask CVMFS to update, or replace more_itertools with the hand-rolled implementation in boost-histogram. If they updated to Python 3.10 that would also fix it. :)

[henryiii]

I have just released Hist 2.5.2 which removes the need for more-itertools, using the same workaround present in boost-histogram instead. I've reached out to someone with LCG to see if either more-itertools or hist can be bumped.