Bug summary

From Version 3.10.0, plt.matshow(..., fignum=...) is broken.
I tested against the last nightly release matplotlib-3.11.0.dev377+g6c5e3f3348, where it is still broken.

Code for reproduction

import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure()
plt.matshow(np.random.random([3, 3]), fignum=fig.number)

Actual outcome

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/wehandre/mambaforge/envs/temptest/lib/python3.12/site-packages/matplotlib/pyplot.py", line 2668, in matshow
    fig = figure(fignum, figsize=figaspect(A))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/wehandre/mambaforge/envs/temptest/lib/python3.12/site-packages/matplotlib/pyplot.py", line 1013, in figure
    if any([figsize, dpi, facecolor, edgecolor, not frameon,
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Expected outcome

No error

Additional information

The issue is, that figsize is a NumPy array, and thus cannot be used within any. figsize is the result of the function matplotlib.figure.figaspect. To my knowledge, previously, this returned a tuple, which can be evaluated as a boolean. The documentation still suggests that the result is a tuple. However, I don't see any changes to matshow or figaspect inspecting their blames.

Operating system

No response

Matplotlib Version

3.10.0

Matplotlib Backend

No response

Python version

3.12.8

Jupyter version

No response

Installation

pip