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[Bug]: The Axes3D does not work as expected. #24639
Description
Bug summary
The Axes3D does not work as expected.
Code for reproduction
import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits.mplot3d import Axes3D
plt.style.use('_mpl-gallery')
# Make data
np.random.seed(19680801)
n = 100
rng = np.random.default_rng()
xs = rng.uniform(23, 32, n)
ys = rng.uniform(0, 100, n)
zs = rng.uniform(-50, -25, n)
# Plot
# fig, ax = plt.subplots(subplot_kw={"projection": "3d"})
fig = plt.figure()
ax = Axes3D(fig)
ax.scatter(xs, ys, zs)
ax.set(xticklabels=[],
yticklabels=[],
zticklabels=[])
plt.show()Actual outcome
The outcome figure is blank.
Expected outcome
Should show figure with correct content.
Additional information
The code works well if changed to
fig, ax = plt.subplots(subplot_kw={"projection": "3d"})
Operating system
Windows
Matplotlib Version
3.6.2
Matplotlib Backend
Qt5Agg
Python version
3.9.15
Jupyter version
NA
Installation
conda
Activity
[-][Bug]: [/-][+][Bug]: The Axes3D does not work as expected.[/+]timhoffm commentedon Dec 6, 2022
Axes objects need correct wiring up with the figure. Therefore, you never instantiate any Axes directly, but use the Axes creation methods on Figure (or pyplot), which do that logic for you.I think this is consistently shown throughout our documentation. Have you found a place that suggests otherwise?
Todo: Maybe we should add a note to Axes constructors that they are not intended for the end-user.
oscargus commentedon Dec 6, 2022
There is a note here: https://matplotlib.org/stable/tutorials/toolkits/mplot3d.html
"Changed in version 1.0.0: Prior to Matplotlib 1.0.0, only a single Axes3D could be created per figure; it needed to be directly instantiated as ax = Axes3D(fig)."
This can possibly be dropped now? But also it indicates that there are old examples out there using this.
(Some tests use
ax = fig.add_axes(Axes3D(fig))so that is, I guess, the way to do it if one really wants to instantiate it separately, but not the way to go.)Add note that users do not instantiate Axes directly
Add note that users do not instantiate Axes directly
tacaswell commentedon Dec 14, 2022
Between this issue and #24725 what is happening that this came up 2x in a week or so but not for the last 4 months from when 3.6 came out?
Add note that users do not instantiate Axes directly
Add note that users do not instantiate Axes directly
Add note that users do not instantiate Axes directly
Add note that users do not instantiate Axes directly