Bug summary

matplotlib.dates.epoch2num is deprecated. The new method suggested in the deprecation warning behaves differently: It does not accept arrays.

Code for reproduction

import matplotlib
import matplotlib.dates
import numpy
datelist = numpy.zeros((2))
datelist[0] = 123456789
datelist[1] = 123456789.1
print(matplotlib.dates.epoch2num(datelist))
import datetime
print(matplotlib.dates.date2num(matplotlib.dates.datetime.datetime.utcfromtimestamp(datelist)))

Actual outcome

The new method crashes with
TypeError: only integer scalar arrays can be converted to a scalar index

Expected outcome

The new method returns the same result as epoch2num: An numpy array with the correct values from the conversion.

Additional information

Workaround by hand is to convert the input array entry for entry and write it to an output array. Works, but is potentially slower (depending on the internals of epoch2num) and can be quite some work to implement everywhere where epoch2num needs to be replaced.

Note: everything works fine as long as only scalars are involved.

Operating system

Fedora

Matplotlib Version

3.5.1

Matplotlib Backend

No response

Python version

Python 3.10.2

Jupyter version

No response

Installation

Linux package manager