matplotlib/Pandas 中的水平箱线图

Question

Bar plots:

matplotlib offers the function bar and barh to do vertical and horizontal bar plots.

Box plots:

matplotlib also offers the function boxplot to do vertical box plots.

And Pandas offers its own function for vertical box plots.

But is there any way in matplotlib or Pandas to get a horizontal box plot?

Answer 1

matplotlib's boxplot(..., vert=False) makes horizontal box plots. The keyword parameter vert=False can also be passed to DataFrame.boxplot :

import matplotlib.pyplot as plt
import pandas as pd
x = [[1.2, 2.3, 3.0, 4.5],
     [1.1, 2.2, 2.9, 5.0]]
df = pd.DataFrame(x, index=['Age of pregnant women', 'Age of pregnant men'])

df.T.boxplot(vert=False)
plt.subplots_adjust(left=0.25)
plt.show()

I see from the comment (below) that the motivation for making a horizontal box plot is that the labels are rather long. Another option in that case might be to rotate the xticklabels:

import matplotlib.pyplot as plt
import pandas as pd
x = [[1.2, 2.3, 3.0, 4.5],
     [1.1, 2.2, 2.9, 5.0]]
df = pd.DataFrame(x, index=['Age of pregnant women', 'Age of pregnant men'])

df.T.boxplot()
plt.subplots_adjust(bottom=0.25)
plt.xticks(rotation=25)
plt.show()

Answer 2

vert=False stands # for "no vertical"

使用 by='categorical_feature name' 为每个级别制作框 plt.tight_layout() # 消除任何重叠的图（并非总是如此）当您掌握 Matplotlib 和 Pandas 时，它们真的很容易，并且您可以使用它们来制作强大的图。

Answer 3

matplotlib has a vert property which is set to True by default. Change it to False

plt.boxplot(df["feature"], vert=False)