Track 14 · Lesson 2 of 12

Vectorised operations

Do arithmetic on whole arrays at once, let broadcasting line up shapes, and aggregate along rows or columns with axis.

You will be able to

• Apply arithmetic and functions to every element of an array without a loop
• Predict how broadcasting combines an array with a scalar or a smaller array
• Aggregate with sum, mean, min, max and std, overall and along an axis
• Explain why vectorised code is preferred over Python loops for numeric data