Question

我有一个代表numpy数组的变量x_axis：

array(['administrator', 'retired', 'lawyer', 'none', 'student',
       'technician', 'programmer', 'salesman', 'homemaker', 'executive',
       'doctor', 'entertainment', 'marketing', 'writer', 'scientist',
       'educator', 'healthcare', 'librarian', 'artist', 'other', 'engineer'], 
      dtype='|S13')

...我的y_axis看起来像这样：

array([ 79,  14,  12,   9, 196,  27,  66,  12,   7,  32,   7,  18,  26,
        45,  31,  95,  16,  51,  28, 105,  67])

当我尝试绘制它们时：

import matplotlib.pyplot as plt
plt.bar(x_axis,y_axis)

我收到错误：

TypeError: cannot concatenate 'str' and 'float' objects

注意：

我看过'类似'的问题，但没有具体询问有关matplotlib.bar的错误。

Answer 1

这是因为bar需要x坐标，但你的x_axis是一个字符串数组。所以，bar不知道在哪里绘制条形图。您需要的是以下内容：

import numpy as np 
import matplotlib.pyplot as plt

y_axis = np.array([ 79,  14,  12,   9, 196,  27,  66,  12,   7,  32,   7,  18,  26,
        45,  31,  95,  16,  51,  28, 105,  67])

x_labels = np.array(['administrator', 'retired', 'lawyer', 'none', 'student',
       'technician', 'programmer', 'salesman', 'homemaker', 'executive',
       'doctor', 'entertainment', 'marketing', 'writer', 'scientist',
       'educator', 'healthcare', 'librarian', 'artist', 'other', 'engineer'], 
      dtype='|S13')

w = 3
nitems = len(y_axis)
x_axis = np.arange(0, nitems*w, w)    # set up a array of x-coordinates

fig, ax = plt.subplots(1)
ax.bar(x_axis, y_axis, width=w, align='center')
ax.set_xticks(x_axis);
ax.set_xticklabels(x_labels, rotation=90);
plt.show()

plt.bar - ＆gt; TypeError：无法连接'str'和'float'对象

1 个答案: