What is numpy indexing and how can I use it?

What is numpy indexing and how can I use it?

Numpy indexing allows you to access and modify elements in a numpy array using various methods like integer indexing, slicing, and boolean indexing.

Can you give me an example of integer indexing?

Sure! If you have an array arr = np.array([1, 2, 3, 4]), you can access the first element with arr[0], which returns 1.

What about slicing? How does that work?

Slicing allows you to access a range of elements. For example, arr[1:3] will return array([2, 3]).

And how can I use boolean indexing?

With boolean indexing, you can filter elements based on a condition. For example, arr[arr > 2] will return array([3, 4]).