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我有以下非常简单的代码:

import matplotlib.pyplot as plt 
import numpy as np
import matplotlib.gridspec as gridspec

x = np.random.randn(60) 
y = np.random.randn(60)
z = [np.random.random() for _ in range(60)]

fig = plt.figure()
gs = gridspec.GridSpec(1, 2)

ax0 = plt.subplot(gs[0, 0])
plt.scatter(x, y, s=20)

ax1 = plt.subplot(gs[0, 1])
cm = plt.cm.get_cmap('RdYlBu_r')
plt.scatter(x, y, s=20 ,c=z, cmap=cm, vmin=0, vmax=1)
cbaxes = fig.add_axes([0.6, 0.12, 0.1, 0.02]) 
plt.colorbar(cax=cbaxes, ticks=[0.,1], orientation='horizontal')

fig.tight_layout()

out_png = '/home/user/image_out.png'
plt.savefig(out_png, dpi=150)
plt.close()

如果我在我的机器上运行它,它可以工作,除了一个警告:

/usr/local/lib/python2.7/dist-packages/matplotlib/figure.py:1533: UserWarning: This figure includes Axes that are not compatible with tight_layout, so its results might be incorrect.
  warnings.warn("This figure includes Axes that are not "

但是如果我在集群上运行它,它会退出并出现以下错误:

/usr/lib/pymodules/python2.7/matplotlib/__init__.py:611: UserWarning: Could not find matplotlibrc; using defaults
  warnings.warn('Could not find matplotlibrc; using defaults')
/usr/lib/pymodules/python2.7/matplotlib/__init__.py:698: UserWarning: could not find rc file; returning defaults
  warnings.warn(message)
Traceback (most recent call last):
  File "colorbar.py", line 7, in <module>
    import matplotlib.pyplot as plt 
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 23, in <module>
    from matplotlib.figure import Figure, figaspect
  File "/usr/lib/pymodules/python2.7/matplotlib/figure.py", line 18, in <module>
    from axes import Axes, SubplotBase, subplot_class_factory
  File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 14, in <module>
    import matplotlib.axis as maxis
  File "/usr/lib/pymodules/python2.7/matplotlib/axis.py", line 10, in <module>
    import matplotlib.font_manager as font_manager
  File "/usr/lib/pymodules/python2.7/matplotlib/font_manager.py", line 1325, in <module>
    _rebuild()
  File "/usr/lib/pymodules/python2.7/matplotlib/font_manager.py", line 1275, in _rebuild
    fontManager = FontManager()
  File "/usr/lib/pymodules/python2.7/matplotlib/font_manager.py", line 962, in __init__
    paths = [os.path.join(rcParams['datapath'], 'fonts', 'ttf'),
  File "/usr/lib/python2.7/posixpath.py", line 77, in join
    elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'

发生了什么事,我该如何解决?

4

1 回答 1

5
  1. 第一个警告与方式有关axes并被subplots创建。axes创建指定大小,同时subplots将轴放在规则网格中。

    所以tight_layout不能调整大小axes,就像它一样,subplots你会收到警告。因此使用axes,subplots并且tight_layout可能需要大量调整fig.add_axes([0.6, 0.12, 0.1, 0.02])

  2. 在集群上运行时出现的错误在我看来与 matplotlib 安装的一些问题有关。警告就是这样:matplotlib在任何标准位置matplotlibrc都找不到任何文件,因此它回退到默认(硬编码)参数。然后它期望找到一个参数。但是不存在(或错误地定义为)所以返回。'datapath'NonercParams['datapath']None

    然后将参数传递给os.path.join期望字符串,而不是NoneType.

    您可以查看是否获取matplotlibrc文件并将其放入当前目录或~/.config/matplotlib可以解决您的问题。

    您应该做的另一件事是检查 matplotlib 的版本,以及您运行的版本是否是您认为正在使用的版本

    python -c 'import matplotlib; print(matplotlib.__version__); print(matplotlib.__file__)'
    

ps:我认为你根本不需要gs = gridspec.GridSpec(1, 2),除非你用轴做一些额外的事情。如果你这样做,你会得到完全相同的答案

fig = plt.figure(...)
ax0 = fig.add_subplot(121)
ax1 = fig.add_subplot(122)

或者

fig, (ax0, ax1) = plt.subplots(nrows=1, ncols=2, ...)
于 2013-10-10T14:21:59.470 回答