試圖從this question重現問題,我發現我不能繪製一個最簡單的輪廓圖。matplotlib等高線圖; '模塊'對象沒有屬性'nextafter'
下面是從gallery
#!/usr/bin/env python
import matplotlib
import numpy as np
import matplotlib.cm as cm
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
delta = 0.025
x = np.arange(-3.0, 3.0, delta)
y = np.arange(-2.0, 2.0, delta)
X, Y = np.meshgrid(x, y)
#Z1 = mlab.bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
#Z2 = mlab.bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
# difference of Gaussians
Z = 10.0 * np.exp(X-Y) #(Z2 - Z1)
plt.figure()
CS = plt.contour(X,Y,Z)
plt.show()
,給了我一個(hopefelly)相關的實例的簡化版本:
Traceback (most recent call last):
File "./contour.py", line 19, in <module>
CS = plt.contour(X,Y,Z)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/pyplot.py", line 2188, in contour
ret = ax.contour(*args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/axes.py", line 7316, in contour
return mcontour.QuadContourSet(self, *args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/contour.py", line 1106, in __init__
ContourSet.__init__(self, ax, *args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/contour.py", line 720, in __init__
self._process_colors()
File "/usr/local/lib/python2.6/dist-packages/matplotlib/contour.py", line 954, in _process_colors
self.set_clim(self.vmin, self.vmax)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/cm.py", line 248, in set_clim
self.changed()
File "/usr/local/lib/python2.6/dist-packages/matplotlib/contour.py", line 841, in changed
self.to_rgba(self.cvalues, alpha=self.alpha)]
File "/usr/local/lib/python2.6/dist-packages/matplotlib/cm.py", line 214, in to_rgba
x = self.cmap(x, alpha=alpha, bytes=bytes)
File "/usr/local/lib/python2.6/dist-packages/matplotlib/colors.py", line 520, in __call__
cbook._putmask(xa, xa==1.0, np.nextafter(xa.dtype.type(1),
AttributeError: 'module' object has no attribute 'nextafter'
的誤差並不取決於我是否堅持原來的'高斯差異'或者嘗試繪製一個指數,就像上面的代碼片斷一樣。
我是否錯過了一些微不足道的東西?
如果它是相關的,我在Ubuntu 10.04
爲了幫助縮小範圍,代碼適用於使用matplotlib「1.0.1」的Ubuntu'11.10'。 – Hooked 2012-02-08 18:35:13
我會考慮改變你的問題的標題。它與等高線圖無關。這是一個很好的問題,而其他人可能會遇到同樣的問題。就像「錯誤運行matplotlib:AttributeError:'模塊'對象沒有屬性'nextafter'」 – Yann 2012-02-08 18:41:41