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Seaborn barplot has three parameters.

x, y, hue : names of variables in data or vector data, optional

Question

What is hue? It seems the attribute to plot but why it is called "hue" because when I googled, the result is about color?

Google

Hue - Wikipedia

Hue is one of the main properties (called color appearance parameters) of a color, defined technically (in the CIECAM02 model)

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In seaborn, the hue parameter determines which column in the data frame should be used for colour encoding. Using the official document for lmplotprovided an example for this.

import seaborn as sns; sns.set(color_codes=True)
tips = sns.load_dataset("tips")
g = sns.lmplot(x="total_bill", y="tip", data=tips)

enter image description here

Adding `hue="smoker" tells seaborn you want to colour the data points for smoker and non-smoker differently.

>>> g = sns.lmplot(x="total_bill", y="tip", hue="smoker", data=tips)

enter image description here

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How many different values may an indicator have?

e.g. smoker has two (Yes, No).

I am doing data exploratory analysis on some data that I have and I have observed that when the number of values exceeds 6 then I get the following error:

"IndexError: invalid index to scalar variable."

When it's less there are no errors! Any hint!

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