matplotlib/seaborn: first and last row cut in half of heatmap plot

Question

When plotting heatmaps with seaborn (and correlation matrices with matplotlib) the first and the last row is cut in halve. This happens also when I run this minimal code exa

Answer 1

Fixed using the above and setting the heatmap limits manually.

First

ax = sns.heatmap(...

checked the current axes with

ax.get_ylim()
(5.5, 0.5)

Fixed with

ax.set_ylim(6.0, 0)

Answer 2

Downgrade your matplotlib

!pip install matplotlib==3.1.0

and add this line to your plot code :

ax[i].set_ylim(sorted(ax[i].get_xlim(), reverse=True))
 

Answer 3

conda install matplotlib=3.1.0

This worked for me and downgraded matplotlib from 3.1.1 to 3.1.0 and the heatmaps started to behave correctly

Answer 4

Its a bug in the matplotlib regression between 3.1.0 and 3.1.1 You can correct this by:

import seaborn as sns
df_corr = someDataFrame.corr()
ax = sns.heatmap(df_corr, annot=True) #notation: "annot" not "annote"
bottom, top = ax.get_ylim()
ax.set_ylim(bottom + 0.5, top - 0.5)

Answer 5

I solved it by adding this line in my code, with matplotlib==3.1.1:

ax.set_ylim(sorted(ax.get_xlim(), reverse=True))

NB. The only reason this works is because the x-axis isn't changed, so use at your own risk with future mpl versions

Answer 6

It happens with matplotlib version 3.1.1 as suggested by importanceofbeingernest

Following solved my problem

pip install matplotlib==3.1.0