Matplotlib相关热图中缺少标签

问题描述

我正在使用UCI机器学习存储库中的

I'm playing around with the abalone dataset from UCI's machine learning repository. I want to display a correlation heatmap using matplotlib and imshow.

The first time I tried it, it worked fine. All the numeric variables plotted and labeled, seen here:

fig = plt.figure(figsize=(15,8))
ax1 = fig.add_subplot(111)
plt.imshow(df.corr(), cmap='hot', interpolation='nearest')
plt.colorbar()
labels = df.columns.tolist()
ax1.set_xticklabels(labels,rotation=90, fontsize=10)
ax1.set_yticklabels(labels,fontsize=10)
plt.show()

successful heatmap

Later, I used get_dummies() on my categorical variable, like so:

df = pd.get_dummies(df, columns = ['sex'])

resulting correlation matrix

So, if I reuse the code from before to generate a nice heatmap, it should be fine, right? Wrong!

What dumpster fire is this?

So my question is, where did my labels go, and how do I get them back?!

Thanks!

解决方案

To get your labels back, you can force matplotlib to use enough xticks so that all your labels can be shown. This can be done by adding

ax1.set_xticks(np.arange(len(labels)))
ax1.set_yticks(np.arange(len(labels)))

before your statements ax1.set_xticklabels(labels,rotation=90, fontsize=10) and ax1.set_yticklabels(labels,fontsize=10).

This results in the following plot:

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