使用弹性类型plt.hist无法执行reduce [英] cannot perform reduce with flexible type plt.hist

问题描述

我有一个包含1000个元素及其各自频率的数据集.我需要绘制出现的前10个元素的直方图.
我做到了:

I have a dataset with 1000s of elements and their respective frquencies. i need to plot a histogram of the top 10 occurring elements.
i did:

  top_words = Counter(my_data).most_common()  
  top_words_10 = top_words[:10]  
  plt.hist(top_words_10,label='True')    

并收到此错误:

TypeError                                   
  Traceback (most recent call last) 
<ipython-input-29-ff974b3a2354> in <module>()  
      5  print top_words[:10]  
      6   
----> 7 plt.hist(top_words_10)    
C:\Anaconda\lib\site-packages\numpy\core\_methods.pyc in _amin(a, axis, out, keepdims)  
     12 def _amin(a, axis=None, out=None, keepdims=False):  
     13     return um.minimum.reduce(a, axis=axis,  
---> 14                             out=out, keepdims=keepdims)  
     15   
     16 def _sum(a, axis=None, dtype=None, out=None, keepdims=False):  


TypeError: cannot perform reduce with flexible type

有什么主意吗?我的数据如下:

Any idea?? my data looks like this :

[(' whitefield', 65299), (' bellandur', 57061), (' kundalahalli', 51769), (' marathahalli', 50639), (' electronic city', 44041), (' sarjapur road junction', 34164), (' indiranagar 2nd stage', 32459), (' malleswaram', 32171), (' yelahanka main road', 28901), (' domlur', 28869)]

推荐答案

出现此错误是因为您需要将数据转换为数字类型.您的数组包含字符串.

You get this error because you need to convert your data to a numeric type. Your array contains strings.

import matplotlib.pyplot as plt
import numpy as np

data = [(' whitefield', 65299), (' bellandur', 57061), (' kundalahalli', 51769), (' marathahalli', 50639),
(' electronic city', 44041), (' sarjapur road junction', 34164), (' indiranagar 2nd stage', 32459),
(' malleswaram', 32171), (' yelahanka main road', 28901), (' domlur', 28869)]

freequency = []
words = []

for line in data:
    freequency.append(line[1])
    words.append(line[0])

y_axis = np.arange(1, len(words) + 1, 1)

plt.barh(y_axis, freequency, align='center')
plt.yticks(y_axis, words)
plt.show()

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