同一图 (seaborn) 上 Pandas 数据框多列的箱线图 [英] Boxplot of Multiple Columns of a Pandas Dataframe on the Same Figure (seaborn)
问题描述
我觉得我可能没有想到一些显而易见的事情.我想放入同一个图,即数据框每一列的箱线图,其中在 x 轴上有列的名称.在 seaborn.boxplot()
中,每列都等于 groupby
.
I feel I am probably not thinking of something obvious. I want to put in the same figure, the box plot of every column of a dataframe, where on the x-axis I have the columns' names. In the seaborn.boxplot()
this would be equal to groupby
by every column.
在熊猫我会做
df = pd.DataFrame(data = np.random.random(size=(4,4)), columns = ['A','B','C','D'])
df.boxplot()
产生的结果
现在我想在 seaborn 中得到同样的东西.但是当我尝试 sns.boxplot(df)
时,我只得到一个分组的箱线图.如何在seaborn中重现相同的图形?
Now I would like to get the same thing in seaborn. But when I try sns.boxplot(df)
, I get only one grouped boxplot. How do I reproduce the same figure in seaborn?
推荐答案
seaborn 等价于
The seaborn equivalent of
df.boxplot()
是
sns.boxplot(x="variable", y="value", data=pd.melt(df))
或者只是
sns.boxplot(data=df)
使用 seaborn v0.11.1
绘制任何数值列,无需将 DataFrame 从宽格式转换为长格式.这将创建一个图形,每列都有一个单独的箱线图.
which will plot any column of numeric values, without converting the DataFrame from a wide to long format, using seaborn v0.11.1
. This will create a single figure, with a separate boxplot for each column.
melt
的完整示例:
import numpy as np; np.random.seed(42)
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
df = pd.DataFrame(data = np.random.random(size=(4,4)), columns = ['A','B','C','D'])
sns.boxplot(x="variable", y="value", data=pd.melt(df))
plt.show()
这是有效的,因为 pd.melt
转换宽格式数据帧
This works because pd.melt
converts a wide-form dataframe
A B C D
0 0.374540 0.950714 0.731994 0.598658
1 0.156019 0.155995 0.058084 0.866176
2 0.601115 0.708073 0.020584 0.969910
3 0.832443 0.212339 0.181825 0.183405
长格式
variable value
0 A 0.374540
1 A 0.156019
2 A 0.601115
3 A 0.832443
4 B 0.950714
5 B 0.155995
6 B 0.708073
7 B 0.212339
8 C 0.731994
9 C 0.058084
10 C 0.020584
11 C 0.181825
12 D 0.598658
13 D 0.866176
14 D 0.969910
15 D 0.183405
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