Why Are My Seaborn Heatmap Rows Half-Cut in Matplotlib 3.1.1?

Unexpected Half-Cut Heatmap Rows: A Matplotlib Problem

You may have encountered a peculiar issue when plotting heatmaps with seaborn, particularly noticeable in correlation matrices generated using matplotlib. The first and last rows of your heatmap appear to be cut in half, despite running a simple code example.

Determining the Culprit

The problem has been traced to matplotlib version 3.1.1, which introduced a bug affecting inverted axes with fixed ticks. This issue manifested after installing texlive-xetex, which was later removed unsuccessfully.

Potential Solutions

To resolve this issue, you have several options:

1. Revert to Matplotlib 3.1.0: Downgrade to the stable version of matplotlib that doesn't exhibit this bug.
2. Upgrade to Matplotlib 3.1.2 or Higher: Install the latest version of matplotlib, which has been patched to fix the issue.
3. Set Heatmap Limits Manually: As a workaround, you can manually set the limits of your heatmap using the following code:

ax.set_ylim(bottom, top)  # Set the y-axis limits to bottom and top

Conclusion

Unfortunately, the bug in matplotlib 3.1.1 can disrupt seaborn heatmaps and other types of plots with inverted axes. By updating to a more recent version or reverting to an earlier one, you can restore the proper functionality of your plots.

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