Why is their a , between fig and ax?

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

Greetings me fellow learners and my mentors, it is requested to tell me that why is their a comma between fig and ax?
Shouldn’t their be only one of them?
Also please explain in brief words what the subplot function is doing?

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2

It’s because the subplots() method returns two values.

From the matplotlib documentation:

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3

Hi @Talha1234, subplots creates a figure (fig) and a set of subplots (ax), and that’s why it is returning two variables as Tom pointed out, and thus you use two variables to receive them.

In the code you provide, the arguments 1, 1 inside subplots refers to arranging the subplots in 1 row and 1 column, which will give us a total of 1 subplot.

For another example, if we used plt.subplots(2, 2, ...) instead, then the subplots will be arranged in 2 rows and 2 columns, giving us a total number of 4 plots, and in that case ax will become an array.