Please! Can you explain more than that?
Aye! The first column is not "sorted according the second column" (only half an explanation). The block of numbers in each row is treated as a fixed unit, and each row is rearranged such that the values in the second column are sorted in ascending order.
Swap the first and last columns
Sum of diagonal of a square matrix
07 - Common functions and indexing 1
Add a row of zeros on top of a matrix
function on a moving window
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