scatter() fails on nan-containing input when providing edgecolor · Issue #14301 · matplotlib/matplotlib · GitHub
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scatter() fails on nan-containing input when providing edgecolor #14301

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#14313
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scatter() fails on nan-containing input when providing edgecolor#14301
#14313
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Release criticalFor bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.status: confirmed bug
Milestone
v3.1.1

Description

@MaozGelbart
MaozGelbart
opened on May 23, 2019

Bug report

Bug summary

Providing ax.scatter() with coordinates containing np.nan fails when providing edgecolor argument (but works when omitting it). Probably related to #12801 and #12422 introduced in 3.1.0, as it runs as expected with 3.0.3.

Code for reproduction

import matplotlib.pyplot as plt 
import numpy as np

fig, ax = plt.subplots()
x = [np.nan]
y = [0]
c = ['k']
ax.scatter(x, y, edgecolor=c)

Actual outcome

Traceback (most recent call last):
  File "D:\test.py", line 9, in <module>
    ax.scatter(x, y, edgecolor=c)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\__init__.py", line 1589, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\axes\_axes.py", line 4490, in scatter
    alpha=alpha
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\collections.py", line 883, in __init__
    Collection.__init__(self, **kwargs)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\collections.py", line 128, in __init__
    self.set_edgecolor(edgecolors)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\collections.py", line 728, in set_edgecolor
    self._set_edgecolor(c)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\collections.py", line 712, in _set_edgecolor
    self._edgecolors = mcolors.to_rgba_array(c, self._alpha)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\colors.py", line 286, in to_rgba_array
    result[i] = to_rgba(cc, alpha)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\colors.py", line 177, in to_rgba
    rgba = _to_rgba_no_colorcycle(c, alpha)
  File "C:\ProgramData\Miniconda3\lib\site-packages\matplotlib\colors.py", line 238, in _to_rgba_no_colorcycle
    raise ValueError("Invalid RGBA argument: {!r}".format(orig_c))
ValueError: Invalid RGBA argument: masked

Expected outcome
Not to fail (and on this example, draw no points; just like without specifying edgecolor argument).

Matplotlib version

  • Operating system: Windows
  • Matplotlib version: 3.1.0
  • Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
  • Python version: 3.7.3
  • Jupyter version (if applicable):
  • Other libraries: numpy 1.16.3

Installed from conda-forge.

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