Broadcasting

Broadcasting is how NumPy combines arrays of different shapes. A smaller array is stretched to match the bigger one, as long as the shapes line up from the right: each pair of sizes must be equal, or one of them must be 1. A single number broadcasts against anything; a row broadcasts down every row of a grid; a column (shape (n, 1)) broadcasts across every column.

Examplepython

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Quick check

Can an array of shape (2, 3) be added to one of shape (3,)?

Yes, the (3,) array broadcasts across both rowsNo, the shapes differOnly if both are square

Your turn: write the code

Subtract each column's average from the grid (grid minus grid.mean(axis=0)) and print the result.

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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