Python 无法使用灵活类型 plt.hist 执行 reduce
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cannot perform reduce with flexible type plt.hist
提问by Hypothetical Ninja
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:
我有一个包含 1000 个元素及其各自频率的数据集。我需要绘制前 10 个出现元素的直方图。
我做到了：
top_words = Counter(my_data).most_common()
top_words_10 = top_words[:10]
plt.hist(top_words_10,label='True')
and got this error :
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
Any idea?? my data looks like this :
任何的想法？？我的数据是这样的：
[(' 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)]
采纳答案by Vlad Sonkin
You get this error because you need to convert your data to a numeric type. Your array contains strings.
您收到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。
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()
回答by tacaswell
The problem is that plt.histtries to use nmupy.histto make a histogram from the data you pass in.
问题是plt.hist试图使用nmupy.hist您传入的数据制作直方图。
You want to just use bar
你只想使用 bar
import matplotlib.pyplot as plt
fig, ax = plt.subplots(1, 1)
words, counts = zip(*data32) # unpack pairs into two lists
ax.bar(range(len(counts)), words, align='center')
ax.set_xticks(range(len(counts))
ax.set_xticklabels(words) # this is about the _only_ use for set_xticklabels
plt.draw
See this exampleand the documentation.
