[Bug]: Second and subsequent calls to plt.polar() return an Axis object and do not plot

Bug summary

When plt.polar() is called while the current axes are a PolarAxes object, the call just returns the axes again without plotting the new data.

The code for polar() in pyplot.py is easily fixed by changing "return ax" to "return ax.plot(*args, **kwargs)".

Code for reproduction

import matplotlib.pyplot as plt

h1 = plt.polar([0],[1],'ro')

h2 = plt.polar([1.57],[.5], 'bo')

plt.show()

Actual outcome

Only the first point is plotted. Note that h1 is a list of length 1 of Line2D objects, while h2 is a PolarAxesSubplot object.

Expected outcome

Both points should be plotted. Both h1 and h2 should be lists of length 1 of Line2D objects.

Operating system

Windows

Matplotlib Version

3.4.3

Matplotlib Backend

No response

Python version

3.9

Jupyter version

No response

Other libraries

No response

Installation

conda

Conda channel

No response

Suggested slightly cleaner version:

def polar(*args, **kwargs):
"""
Make a polar plot.

call signature::

  polar(theta, r, **kwargs)

Multiple *theta*, *r* arguments are supported, with format strings, as in
`plot`.
"""
# If an axis already exists, check if it has a polar projection
if gcf().get_axes():
    ax = gca()
    if not isinstance(ax, PolarAxes):
        _api.warn_external('Trying to create polar plot on an Axes '
                           'that does not have a polar projection.')
else:
    ax = axes(projection="polar")
return ax.plot(*args, **kwargs)

Yes. Do you want to make a pull request?

Note: This is a regression from #19153 introduced into 3.4.0.

I'm working the pull request and will submit shortly.

@beckja

Thank you @beckja !

Closed by #21131.

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[Bug]: Second and subsequent calls to plt.polar() return an Axis object and do not plot #21113

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[Bug]: Second and subsequent calls to plt.polar() return an Axis object and do not plot #21113

Description

Bug summary

Code for reproduction

Actual outcome

Expected outcome

Operating system

Matplotlib Version

Matplotlib Backend

Python version

Jupyter version

Other libraries

Installation

Conda channel

Activity

beckja commented on Sep 18, 2021

timhoffm commented on Sep 18, 2021

timhoffm commented on Sep 18, 2021

beckja commented on Sep 19, 2021

tacaswell commented on Sep 19, 2021

QuLogic commented on Sep 20, 2021

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