用于logit scale轴标签的Python matplotlib ValueError

Question

使用matplotlib设置logit刻度轴的标签时，我得到了看起来像标签定位错误的内容，这是我的例子：

import matplotlib.pyplot as plt;
from matplotlib.ticker import FormatStrFormatter;

x = [1,2,3,4,5];
y = [0.1,0.2,0.3,0.4,0.5];

fig,ax = plt.subplots();

ax.set_ylim([0.005,0.99]);
ax.set_yscale('logit');
ax.yaxis.set_minor_formatter(FormatStrFormatter(""));   

ax.set_xlabel("X axis");
ax.set_ylabel("Y axis"); #set y axis label (logit scale)

ax.plot(x,y);
plt.show();
plt.close();

这里有追踪：

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/backends/backend_macosx.py", line 136, in _draw
    self.figure.draw(renderer)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/figure.py", line 1143, in draw
    renderer, self, dsu, self.suppressComposite)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images
    a.draw(renderer)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/axes/_base.py", line 2409, in draw
    mimage._draw_list_compositing_images(renderer, self, dsu)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/image.py", line 139, in _draw_list_compositing_images
    a.draw(renderer)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/axis.py", line 1150, in draw
    self.label.draw(renderer)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/artist.py", line 63, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/text.py", line 762, in draw
    raise ValueError("posx and posy should be finite values")
ValueError: posx and posy should be finite values

省略

时效果很好

ax.set_ylabel("Y axis"); #set y axis label (logit scale)

在轴刻度之前或之后设置标签并不重要。 任何人都知道如何解决这个问题？

Answer 1

文本标签的设置方式存在错误，导致logit比例的非数字边界框，请参阅this issue on GitHub。

解决方案是添加

ax.spines['left']._adjust_location()

（其中'left'可以替换为'right'，'top'，'bottom'，具体取决于您感兴趣的轴）。

完整示例：

import matplotlib.pyplot as plt

x = [1,2,3,4,5]
y = [0.05,0.2,0.3,0.4,0.95]

fig,ax = plt.subplots()

ax.set_yscale('logit')

ax.set_xlabel("X axis")
ax.set_ylabel("Y axis")
ax.spines['left']._adjust_location()

ax.plot(x,y)
plt.show()