seaborn.lmplot raises ValueError when set both `hue` and `scatter_kws`'s `s`

Question

This code is provided in the book "Pandas for everyone" (3.4.3.2 Size and Shape).

import seaborn as sns
from matplotlib import pyplot as plt

tips = sns.load_dataset('tips')
sns.lmplot(
    x='total_bill',
    y='tip',
    data=tips,
    fit_reg=False,
    hue='sex',
    scatter_kws={'s': tips['size'] * 10}
)
plt.show()

When I run this code, it results ValueError at matplotlib/axes/_axes.py line 4508.

ValueError: s must be a scalar, or float array-like with the same size
as x and y

This error won’t be raised if I omit the hue argument. It seems that the data (tips['total_bill'] and tips['tip']) are split by sex, but tips['size'] is not split, so the lengths are different.

How can I manage to plot the figure without error?

Versions

Python 3.7
matplotlib 3.4.2
seaborn 0.11.1

Ran on both windows 10 and Google Colab.

Asked By: noobar

||

Source

Answer 1

As per seaborn issue 2621, lmplot with scatter_kws or relplot with s: ValueError: s must be a scalar, or float array-like with the same size as x and y, the seaborn main developer states this should not work with lmplot and alarmed that it’s in that book!.
- I believe the reason it stopped "working" is that matplotlib added some input validation to catch cases like this.
- lmplot draws separate scatterplots for each level of hue, but the matplotlib kwargs are just passed straight through to scatter, so those vectors are going to have different lengths.
Using seaborn 0.11.1 and matplotlib 3.4.2

Use `sns.scatterplot`

import seaborn as sns

tips = sns.load_dataset('tips')

sns.scatterplot(data=tips, x="total_bill", y="tip", hue="sex", size='size')

sns.scatterplot(data=tips, x="total_bill", y="tip", hue="sex", s=tips["size"].mul(20))

Use `sns.relplot`

import seaborn as sns

tips = sns.load_dataset('tips')

sns.relplot(data=tips, kind='scatter', x="total_bill", y="tip", hue="sex", size='size')

sns.relplot(data=tips, x='total_bill', y='tip', hue='sex', s=tips['size'].mul(20))

Answered By: Trenton McKinney

seaborn.lmplot raises ValueError when set both `hue` and `scatter_kws`'s `s`

Question:

Answers:

Use `sns.scatterplot`

Use `sns.relplot`

seaborn.lmplot raises ValueError when set both `hue` and `scatter_kws`'s `s`

Question:

Answers:

Use sns.scatterplot

Use sns.relplot

Use `sns.scatterplot`

Use `sns.relplot`