使用python按类别绘制直方图

Question

我有一个包含2列的表（比如说）

column A = {0,0,1,1,0,2,0,2,2,1,2,1}
column B = {0.1,0.2,0.3,0.4,0.2,0.3,0.5,0.75,0.8,0.9,1.3,0.2}

我想在列B中为A中的特定值绘制值的直方图。例如：仅在A = 0时绘制单个直方图。

我尝试过在哪里可以使用group by来绘制多个直方图。

x=test['<column header a>']
y=test['<column header b>']
df['N'].hist(by=df['column header'])

我想限制一个直方图。

Answer 1

首先过滤A，然后调用hist()

 import pandas as pd
 df = pd.DataFrame({'A': [0,0,1,1,0,2,0,2,2,1,2,1], 'B': [0.1,0.2,0.3,0.4,0.2,0.3,0.5,0.75,0.8,0.9,1.3,0.2]})

df[df['A']==0].hist('B')