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 2 - Function Path
Back to basics 13 - Input variables
Change the sign of even index entries of the reversed vector
Matlab Basics - Absolute Value
function on a moving window
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