Seaborn histplot stat=count does not count all points

Question

The following code should produce a histrogram count plot for the 2 arrays.


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

sns.set(style="whitegrid")

data_a = [1, 2, 3]
data_b = [2.4, 2.5, 2.6]

sns.histplot(np.array(data_a),    color="red", binwidth=0.01, stat="count")
sns.histplot(np.array(data_b),    color="blue", binwidth=0.01, stat="count")

plt.savefig("output.png")

Why does it only show two blue bars for the three points in the array. The data point 2.6 is ignored. The longer I think about this the more I suspect that this is a bug in the library. Or do I miss something?

I am using: python: 3.9.10, seaborn:0.11.2, seaborn-base: 0.11.2

inquirer · Accepted Answer · 2022-04-28 12:37:02Z

1

import matplotlib.pyplot as plt
import seaborn as sns

sns.set(style="whitegrid")

data_a = [1, 2, 3]
data_b = [2.4, 2.5, 2.6]

sns.histplot([data_a, data_b], palette=['red', 'blue'], binwidth=0.01, stat="count")
plt.savefig("output.png")
plt.show()

I can suggest the following option. Fill in the data for once, then it will work. And don't forget to vote for the answer if it helped you (check the box that is below the upper and lower triangle and click on the upper triangle).

edited Apr 28, 2022 at 12:37

answered Apr 28, 2022 at 12:19

inquirer

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6 Comments

Eddy-Python Over a year ago

Many thanks. This is interesting! Is there a reason, it should work if it is entered in one line.

Eddy-Python Over a year ago

If I only use the command "sns.histplot(np.array(data_b), color="blue", binwidth=0.01, stat="count")" and comment out the other sns.histplot command, the peak is also not drawn.

inquirer Over a year ago

If you do, 'binwidth=0.015' then it works. To be honest, I myself cannot understand why this is so. Information on a similar topic cannot be found. You can also try the 'sns' style and the rest is matplotlib. Now can vote.

Eddy-Python Over a year ago

I now decided to open an issue in the seaborn Github repository, since I am more and more convinced that it is not a wrong usage but a bug in the library. Many thanks again.

Eddy-Python Over a year ago

According to the github/seaborn page, the bug has been fixed and is supposed to be in v0.12.0. Many thanks to mwaskom. Most probably, it will take some time until it appears in a stable branch that is distibuted with package managers.

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