FacetGrid 的 Matplotlib 轴

Question

为什么 https://seaborn.pydata.org/generated/seaborn.FacetGrid.html

没有ax 像其他图形一样接受 matplotlib 轴的参数

例如，https://seaborn.pydata.org/generated/seaborn.distplot.html?

因为我需要为 FacetGrid 设置 matplotlib 轴以引入自定义样式。

Answer 1

FaceGrid 生成网格，因此您不能将网格传递给它。各个图都存储在里面，可以像下面的代码一样进行操作。另请注意Axes and Axis are different in Matplotlib。下面的代码展示了一种同时获取 Axes 和 Axis 的方法：

import seaborn as sns
import pandas as pd

#dummy data
data= pd.DataFrame(data={'a':np.random.randint(0,2, 100),
                         'b':np.random.rand(100),
                         'c':np.random.rand(100)})

# make facetgrid and store in variable
g = sns.FacetGrid(data, col='a') # make facetgrid with 2 columns, because there are two distinct values in column a of data
g.map(plt.scatter, 'b', 'c') # map function to grid

# the individual axes of the grid are stored in g.
# you can access and edit them like so:

for ax in g.axes[0]:
    ax.set_ylabel('test')
    ax.set_ylim(0,1.5)
    ax.set_title('title')
    # now you can obtain the axis from one of the axes
    x_axis = ax.get_xaxis()