绘制在seaborn clustermap之上

Question

我使用seaborn.clustermap生成了一个群集图。 我想在热图的顶部绘制/绘制一条水平线，如图

我只是尝试使用matplotlib：

plt.plot([x1, x2], [y1, y2], 'k-', lw = 10)

但不显示该行。 seaborn.clustermap返回的对象没有类似question之类的任何属性。 我该如何画线？

这是生成类似于我发布的“随机”群集图的代码：

import numpy as np
import seaborn as sns
import pandas as pd
import matplotlib.pyplot as plt
import random 

data = np.random.random((50, 50))
df = pd.DataFrame(data)
row_colors = ["b" if random.random() > 0.2 else "r"  for i in range (0,50)]
cmap = sns.diverging_palette(133, 10, n=7, as_cmap=True)
result = sns.clustermap(df, row_colors=row_colors, col_cluster = False, cmap=cmap, linewidths = 0)
plt.plot([5, 30], [5, 5], 'k-', lw = 10)
plt.show()

Answer 1

您想要的轴对象隐藏在ClusterGrid.ax_heatmap中。此代码找到此轴并简单地使用ax.plot（）来绘制线。你也可以使用ax.axhline（）。

import numpy as np
import seaborn as sns
import pandas as pd
import matplotlib.pyplot as plt
import random 

data = np.random.random((50, 50))
df = pd.DataFrame(data)
row_colors = ["b" if random.random() > 0.2 else "r"  for i in range (0,50)]
cmap = sns.diverging_palette(133, 10, n=7, as_cmap=True)
result = sns.clustermap(df, row_colors=row_colors, col_cluster = False, cmap=cmap, linewidths = 0)
print dir(result)  # here is where you see that the ClusterGrid has several axes objects hiding in it
ax = result.ax_heatmap  # this is the important part
ax.plot([5, 30], [5, 5], 'k-', lw = 10)
plt.show()