Problem 431. Indirect Sorting

Created by Yvan Lengwiler

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Assume that x is an n-by-2 matrix. The aim is to return the first column of x, but sorted according to the second column.
Example:
 Input  = [1 2 3 4 5;
           4 3 1 2 2]'
 Output = [3 4 5 2 1]'

Solve

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Last Solution submitted on Oct 03, 2025

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Abdelhak ARESMOUK on 14 Dec 2012

Please! Can you explain more than that?

Jonathan Campelli on 19 May 2015

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.

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Problem 431. Indirect Sorting

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Problem 431. Indirect Sorting

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