绘制多个seaborn图时未显示图例 [英] Legend not showing when plotting multiple seaborn plots

问题描述

我通常不会在matplotlib legend上遇到问题，但这是我第一次将它与多个seaborn地块一起使用，并且以下情况不起作用.

I typically don't have problems with matplotlib legend, but this is the first time I am using it with multiple seaborn plots, and the following does not work.

fig = plt.figure(figsize=(10,6))
a =sns.regplot(x='VarX', y='VarY1', data=data)
b = sns.regplot(x='VarX', y='VarY2', data=data)
c = sns.regplot(x='VarX', y='VarY3', data=data)
fig.legend(handles=[a, b, c],labels=['First','Second','Third'])
fig.show()

我做错了什么?

推荐答案

seaborn.regplot 返回轴.您不能从坐标区创建图例代理句柄.但是，这甚至没有必要.从图例中删除 handles，它应该给出所需的图.

seaborn.regplot returns an axes. You cannot create a legend proxy handle from an axes. However this is not even necessary. Remove the handles from the legend and it should give the desired plot.

import matplotlib.pyplot as plt
import numpy as np; np.random.seed(1)
import pandas as pd
import seaborn as sns

data=pd.DataFrame({"VarX" : np.arange(10), 
                   'VarY1': np.random.rand(10),
                   'VarY2': np.random.rand(10),
                   'VarY3': np.random.rand(10)})

fig = plt.figure(figsize=(10,6))
sns.regplot(x='VarX', y='VarY1', data=data)
sns.regplot(x='VarX', y='VarY2', data=data)
sns.regplot(x='VarX', y='VarY3', data=data)
fig.legend(labels=['First','Second','Third'])
plt.show()

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