Python (NumPy)：集合只能映射级别1数组
提问于 2013-08-22 09:30:32
我遇到了以下错误，我不知道为什么.
>>> x = np.matrix([[1,2,3,4]])
>>> x
matrix([[1, 2, 3, 4]])
>>> pcolor(x)
<matplotlib.collections.PolyCollection object at 0x108bb1810>
>>> show()
Traceback (most recent call last):
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/figure.py", line 1006, in draw
func(*args)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/axes.py", line 2086, in draw
a.draw(renderer)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/collections.py", line 755, in draw
return Collection.draw(self, renderer)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/artist.py", line 54, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/collections.py", line 244, in draw
self.update_scalarmappable()
File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/collections.py", line 609, in update_scalarmappable
raise ValueError('Collections can only map rank 1 arrays')
ValueError: Collections can only map rank 1 arrays
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-08-22 12:20:14
只是把你的矩阵投给了一条警钟：
import numpy as np
from matplotlib.pyplot import pcolor, show
x = np.matrix([[1,2,3,4]])
pcolor(np.array(x))
show()你确定你首先需要一个矩阵吗？电子邮件使用起来要容易得多，也要普遍得多。
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原文链接：
https://stackoverflow.com/questions/18387102
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