Matplotlib- 返回数组必须是 ArrayType答案

【问题标题】：Matplotlib- return arrays must be of ArrayTypeMatplotlib- 返回数组必须是 ArrayType
【发布时间】：2021-07-21 11:20:14
【问题描述】：

import matplotlib.pyplot as plt
import numpy as  np

labels = ['2009-2015', '2016-2018', '2019-2021']
European = [92.55, 83.57, 82.52]
Asian = [5.96, 8.55, 10.68]
African = [1.49, 1.89, 6.37]
Other = [0, 5.99, 0.43]

b_African = list(np.add(European,Asian))
b_Other = list(np.add(European,Asian,African))

width = 0.35

fig, ax = plt.subplots()

ax.bar(labels, European, width, label='European')
ax.bar(labels, Asian, width, bottom=European,label='Asian')
ax.bar(labels, African, width, bottom=b_African,label='African')
ax.bar(labels, Other, width, bottom=b_African,label='Other')

我有一个语法

TypeError                                 Traceback (most recent call last)
<ipython-input-6-5cfdb21f17d8> in <module>
     10 
     11 b_African = list(np.add(European,Asian))
---> 12 b_Other = list(np.add(European, Asian,African))
     13 
     14 width = 0.35

TypeError: return arrays must be of ArrayType

有人知道怎么解决吗？

【问题讨论】：

添加两个相同形式的数组是np.add()，所以我认为可以通过以下方式。 b_Other = list(np.add(np.add(European,Asian),African))

标签： python numpy matplotlib bar-chart

【解决方案1】：

此答案遵循 cmets 的建议。你想添加相同类型的数组！

import matplotlib.pyplot as plt
import numpy as  np

labels = ['2009-2015', '2016-2018', '2019-2021']
European = [92.55, 83.57, 82.52]
Asian = [5.96, 8.55, 10.68]
African = [1.49, 1.89, 6.37]
Other = [0, 5.99, 0.43]

b_African = list(np.add(European,Asian))
# This is the trick:
b_Other = list(np.add(np.add(European,Asian),African))

width = 0.35

fig, ax = plt.subplots()

ax.bar(labels, European, width, label='European');
ax.bar(labels, Asian, width, bottom=European,label='Asian');
ax.bar(labels, African, width, bottom=b_African,label='African');
ax.bar(labels, Other, width, bottom=b_African,label='Other');

plt.show()

【讨论】：