Closed
Description
Bug report
Bug summary
plt.errorbar( ..., marker=<matplotlib.markers.MarkerStyle object>) raises a `TypeError: float() argument must be a string or a number, not 'MarkerStyle' unexpectedly.
Code for reproduction
#!/usr/bin/env python3
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.markers import MarkerStyle
print(f"{matplotlib.__version__=}")
print(matplotlib.get_backend())
# I want to use this marker in an errorbar plot
m = MarkerStyle("D")
m._transform.scale(1.0, 0.6)
print(m)
# I can use it in a scatter plot
fig, ax = plt.subplots()
plt.scatter([1,2,3],[1,2,3], s=225, marker="d")
plt.scatter([1,2,3],[2,3,4], s=225, marker=m, color="crimson")
plt.errorbar([1,2,3],[3,4,5], yerr=[0.5,0.5,0.5], marker='o', linestyle='none', color='green')
plt.show()
# which produces a figure similar to https://stackoverflow.com/a/49662571/
# But when I use it in errorbar
fix, ax = plt.subplots()
plt.errorbar([1,2,3],[3,4,5], yerr=[0.5,0.5,0.5], marker=m, linestyle='none', color='green')
plt.show()Actual outcome
The first figure is produced with a correctly-rotated marker, similar to this Stack Overflow answer, which looks like this:
After closing the first figure, the second figure, in contrast, gives an error.
> ./example.py
matplotlib.__version__='3.2.2'
<matplotlib.markers.MarkerStyle object at 0x106e89d00>
Traceback (most recent call last):
File "./example.py", line 25, in <module>
plt.errorbar([1,2,3],[3,4,5], yerr=[0.5,0.5,0.5], marker=m, color='green')
File "/usr/local/lib/python3.8/site-packages/matplotlib/pyplot.py", line 2524, in errorbar
return gca().errorbar(
File "/usr/local/lib/python3.8/site-packages/matplotlib/__init__.py", line 1565, in inner
return func(ax, *map(sanitize_sequence, args), **kwargs)
File "/usr/local/lib/python3.8/site-packages/matplotlib/axes/_axes.py", line 3265, in errorbar
data_line = mlines.Line2D(x, y, **plot_line_style)
File "/usr/local/lib/python3.8/site-packages/matplotlib/lines.py", line 378, in __init__
self._marker = MarkerStyle(marker, fillstyle)
File "/usr/local/lib/python3.8/site-packages/matplotlib/markers.py", line 225, in __init__
self.set_marker(marker)
File "/usr/local/lib/python3.8/site-packages/matplotlib/markers.py", line 289, in set_marker
Path(marker)
File "/usr/local/lib/python3.8/site-packages/matplotlib/path.py", line 127, in __init__
vertices = _to_unmasked_float_array(vertices)
File "/usr/local/lib/python3.8/site-packages/matplotlib/cbook/__init__.py", line 1317, in _to_unmasked_float_array
return np.asarray(x, float)
File "/usr/local/lib/python3.8/site-packages/numpy/core/_asarray.py", line 83, in asarray
return array(a, dtype, copy=False, order=order)
TypeError: float() argument must be a string or a number, not 'MarkerStyle'
Expected outcome
The second figure should show a sequence of diamonds that are the thin_diamond marker but rotated 90˚ (so that it's wider than it is tall), like the red diamonds in the first figure, but with error bars of width 0.5 (like the green circles in the first figure).
Matplotlib version
- Operating system: macOS Catalina 10.15.6
- Matplotlib version: 3.2.2
- Matplotlib backend (
print(matplotlib.get_backend())): MacOSX - Python version: 3.8.5
- Jupyter version (if applicable):
- Other libraries:
Installed mpl via pip3.
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