Only the first row of annotations displayed on seaborn heatmap

Question

As it's usually advised, I have managed to reduce my problem to a minimal reproducible example:

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

matrix = np.array([[0.1234, 1.4567, 0.7890, 0.1234],
                   [0.9876, 0, 0.5432, 0.6789],
                   [0.1111, 0.2222, 0, 0.3333],
                   [0.4444, 0.5555, 0.6666, 0]])
sns.heatmap(matrix, annot=True)
plt.show()

Vaguely based on Seaborn official documentation.

Unfortunately, unlike what would be expected (all numbers visible), I get only the numbers in the top row visible:

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As there is not really much room for error in this one, I'm out of ideas and google/SO doesn't seem to have this question asked before. Is this a bug?

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I am running:

Seaborn 0.12.2
Matplotlib 3.8.0
PyCharm 2023.1.4
Windows 10

Mercantilism

Using seaborn version 0.12.2 the plot has all the annotations. What version are you on? – Scandian

I ran and got the excepted output on the 0.12.2 version – Bel

Updated the post with my environment – Sazerac

My environment (on Windows 10) is running Matplotlib 3.7.1. The PyCharm version shouldn't affect the results. Maybe it's a bug related to a new version of Matplotlib? – Scandian

This is a result of a change in matplotlib: github.com/mwaskom/seaborn/issues/3478 – Achorn

To summarize: there was a change in Matplotlib 3.8 that is causing this issue. It will be fixed in a future version, but for now, the fix is to downgrade to Matplotlib 3.7 to get the desired results. – Scandian

Answer 1

Just ran into the issue myself, I was on Seaborn 0.12.2. Ran pip install seaborn --upgrade and now have 0.13.0

Restarted vscode and annotations appeared.

Swamp

Answer 2

Thanks to a comment by @mwaskom, it seems like it's a Matplotlib issue with a documented solution:

Looks like problem goes away if I downgrade MATPLOTLIB to version 3.7.3.

Mercantilism

Answer 3

Yes, issue was for Seaborn 0.12.2, Seaborn 0.13.0 solves the issue.

Kirchner

Answer 4

!pip install seaborn --upgrade

In vscode works fine for me in macbook pro m1. Relaunch after upgrade.

Solar

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. – Meares

This does not provide an answer to the question. Once you have sufficient reputation you will be able to comment on any post; instead, provide answers that don't require clarification from the asker. - From Review – Malley

Answer 5

For those on earlier versions.

I am using seaborn version 0.13.0 and it works nicely.

Escudo

Answer 6

I was facing the same issue when i was using the matplolib version 3.8.0 however i changed my version to 3.7.3 it's working now.

Margarito

Your solution has already been posted for this question, please double-check before adding an answer. Thanks. – Hectograph