Seaborn Heatmap:将色条移动到图的顶部 [英] Seaborn Heatmap: Move colorbar on top of the plot

问题描述

我有一个使用seaborn库创建的基本热图，并且想要将颜色栏从默认值(垂直和右侧)移动到热图上方的水平位置.我该怎么办?

I have a basic heatmap created using the seaborn library, and want to move the colorbar from the default, vertical and on the right, to a horizontal one above the heatmap. How can I do this?

以下是一些示例数据和默认示例:

Here's some sample data and an example of the default:

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

# Create data
df = pd.DataFrame(np.random.random((5,5)), columns=["a","b","c","d","e"])

# Default heatma
ax = sns.heatmap(df)
plt.show()

推荐答案

查看文档我们找到一个参数cbar_kws.这允许指定传递给matplotlib的fig.colorbar方法的参数.

Looking at the documentation we find an argument cbar_kws. This allows to specify argument passed on to matplotlib's fig.colorbar method.

cbar_kws:键的字典，值映射，可选. fig.colorbar的关键字参数.

cbar_kws : dict of key, value mappings, optional. Keyword arguments for fig.colorbar.

因此，我们可以使用fig.colorbar的任何可能的参数，从而提供cbar_kws的字典.

So we can use any of the possible arguments to fig.colorbar, providing a dictionary to cbar_kws.

在这种情况下，您需要location="top"才能将颜色栏放置在顶部.因为默认情况下colorbar使用gridspec定位颜色栏，然后不允许设置位置，所以我们需要关闭该gridspec(use_gridspec=False).

In this case you need location="top" to place the colorbar on top. Because colorbar by default positions the colorbar using a gridspec, which then does not allow for the location to be set, we need to turn that gridspec off (use_gridspec=False).

sns.heatmap(df, cbar_kws = dict(use_gridspec=False,location="top"))

完整示例:

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

df = pd.DataFrame(np.random.random((5,5)), columns=["a","b","c","d","e"])

ax = sns.heatmap(df, cbar_kws = dict(use_gridspec=False,location="top"))

plt.show()

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