Why Are My Seaborn Heatmaps Cutting Off the First and Last Rows?

Heatmap Plot Cut in Half for First and Last Row

In Seaborn heatmap plots and Matplotlib correlation matrices, it has been observed that the first and last rows are often cut in half. This issue can be encountered even in a minimal code example:

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

data = pd.read_csv('https://raw.githubusercontent.com/resbaz/r-novice-gapminder-files/master/data/gapminder-FiveYearData.csv')
plt.figure(figsize=(10,5))
sns.heatmap(data.corr())
plt.show()

The resulting plot displays labels at the correct position on the y-axis, but the rows themselves are incomplete.

Origin of the Problem:

Unfortunately, Matplotlib version 3.1.1 introduced a bug that affects Seaborn heatmaps and inverted axes with fixed ticks.

Solution:

To resolve this issue, you can consider the following options:

• Revert to Matplotlib 3.1.0: This version of Matplotlib did not exhibit this issue.
• Update to Matplotlib 3.1.2 or Higher: The bug has been fixed in the current development version.
• Manually Set Heatmap Limits: As a workaround, you can set the heatmap limits manually using ax.set_ylim(bottom, top) to define the bottom and top limits of the y-axis.

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