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.
Back to basics 6 - Column Vector
Getting the indices from a vector
Matrix which contains the values of an other matrix A at the given locations.
Getting the indices from a matrice
Count up then down
function on a moving window
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