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[Bug]: ax.errorbar raises for all-nan data on matplotlib 3.6.2 #24818

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MaximeLucasSky opened this issue Dec 26, 2022 · 1 comment · Fixed by #25547
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[Bug]: ax.errorbar raises for all-nan data on matplotlib 3.6.2 #24818

MaximeLucasSky opened this issue Dec 26, 2022 · 1 comment · Fixed by #25547
Milestone
v3.7.2

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@MaximeLucasSky
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MaximeLucasSky commented Dec 26, 2022 •
edited by rcomer
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Bug summary

The function ax.errorbar raises a StopIteration error when yerr contains only NaN values.

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np
fig, ax = plt.subplots(1, 1)
ax.errorbar([0], [0], [np.nan])

Actual outcome

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/__init__.py", line 1423, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
  File "~.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/axes/_axes.py", line 3488, in errorbar
    yerr = _upcast_err(yerr)
  File "~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/axes/_axes.py", line 3470, in _upcast_err
    isinstance(cbook._safe_first_finite(err), np.ndarray)
  File "~/.local/share/virtualenvs/pipeline/lib/python3.9/site-packages/matplotlib/cbook/__init__.py", line 1749, in _safe_first_finite
    return next(val for val in obj if safe_isfinite(val))
StopIteration

Expected outcome

No crash, similar to the case where only some values are NaN.

Additional information

This happens because _upcast_err unconditionally looks for a first finite element in xerr and yerr.

Operating system

Debian

Matplotlib Version

3.6.2

Matplotlib Backend

TkAgg

Python version

3.9.2

Jupyter version

No response

Installation

pip
@rcomer
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rcomer commented Dec 26, 2022

Possible duplicate of #18294.

@MaximeLucasSky MaximeLucasSky mentioned this issue Dec 27, 2022
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This was referenced Mar 25, 2023
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@QuLogic QuLogic added this to the v3.7.2 milestone May 13, 2023
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FIX: _safe_first_finite on all non-finite array rcomer/matplotlib
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@QuLogic @rcomer @MaximeLucasSky