hist, uproot4 issue

.gitignore

.ipynb_checkpoints/

README.md

Issue

Minimal failing example

$ python minimal-failing.py
hists in file: ['mass;1']
Traceback (most recent call last):
  File "minimal-failing.py", line 100, in <module>
    main()
  File "minimal-failing.py", line 96, in main
    minimal_failing(root_file)
  File "minimal-failing.py", line 73, in minimal_failing
    hist_mass.plot()
  File "/home/feickert/.venvs/hist-issue/lib/python3.7/site-packages/hist/basehist.py", line 204, in plot
    return self.plot1d(*args, **kwargs)
  File "/home/feickert/.venvs/hist-issue/lib/python3.7/site-packages/hist/basehist.py", line 222, in plot1d
    return hist.plot.histplot(self, ax=ax, **kwargs)
  File "/home/feickert/.venvs/hist-issue/lib/python3.7/site-packages/mplhep/plot.py", line 132, in histplot
    h = np.asarray(h).astype(float)
TypeError: Cannot cast array data from dtype([('value', '<f8'), ('variance', '<f8')]) to dtype('float64') according to the rule 'unsafe'

Minimal passing example

$ python minimal-failing.py pass
Saved figure

minimal-failing.ipynb

minimal-failing.py

import numpy as np
import uproot as uproot3
import uproot4 as uproot
import hist
from hist import Hist
import sys


def write_root_file(name="example.root"):
    values = np.array(
        [
            0.0,
            0.0,
            0.0,
            0.0,
            0.0,
            0.1305842101573944,
            1.8680684566497803,
            5.039996147155762,
            10.908727645874023,
            16.122821807861328,
            19.942882537841797,
            20.3310489654541,
            20.61619758605957,
            19.830669403076172,
            16.36935806274414,
            14.46778678894043,
            12.30238151550293,
            10.680359840393066,
            8.495804786682129,
            6.819866180419922,
            5.613673210144043,
            4.6372199058532715,
            3.0081684589385986,
            2.6621906757354736,
            1.9703816175460815,
            1.5290508270263672,
            1.142599105834961,
            1.1284815073013306,
            0.9037942886352539,
            0.5355855226516724,
            0.2520864009857178,
            0.3385327458381653,
            0.2901037633419037,
            0.15997962653636932,
            0.126237154006958,
            0.07963479310274124,
            0.04193861410021782,
            0.0325426310300827,
            0.03738107904791832,
            0.005638935137540102,
            0.0,
            0.0,
            0.006189885549247265,
            0.0,
            0.0,
            0.0,
            0.010353004559874535,
            0.0,
            0.0,
            0.0,
        ]
    )
    edges = np.arange(0, 10000 + 200, 200)

    with uproot3.recreate(name, compression=uproot3.ZLIB(4)) as outfile:
        outfile["mass"] = (values, edges)


def minimal_failing(root_file):
    print(f"hists in file: {root_file.keys()}")
    hist_mass = root_file["mass"].to_hist()
    hist_mass.plot()


def minimal_passing(root_file):
    values, edges = root_file["mass"].to_numpy()
    hist_mass = Hist(
        hist.axis.Regular(len(edges) - 1, edges[0], edges[-1], name="mass"),
        storage=hist.storage.Double(),
    )
    hist_mass[:] = values
    artists = hist_mass.plot()
    fig = artists[0].step.figure
    fig.savefig("mass_plot.png")
    print("Saved figure")


def main(input=sys.argv):
    write_root_file("example.root")

    root_file = uproot.open("example.root")
    if input[-1] == "pass":
        minimal_passing(root_file)
    else:
        minimal_failing(root_file)


if __name__ == "__main__":
    main()

requirements.txt

hist[plot]==2.0.1
uproot4==0.0.27
uproot~=3.12
jupyter~=1.0
jupyterlab~=2.2