Problem 1321. Given a 4x4 matrix, swap the two middle columns

Created by Harish Maradana

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 a = [1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4];

then the result is

 ans =

     1     3     2     4
     1     3     2     4
     1     3     2     4
     1     3     2     4

Perform a simple swap of the two middle columns.

Solve

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Last Solution submitted on Jun 02, 2020

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goc3 on 6 Apr 2017

Additional test cases have been added.

Informaton on 17 May 2017

This is a poor question in that it tells you to swap the middle two columns of a 4x4 matrix, but then tests things other than than 4x4 matrices. You'll have to study the test cases and the given answers to see what the test maker is really after here :(

William Katzianer on 28 Aug 2018

You may want to change the test description. You are not actually looking for the middle two columns. I won't give away the solution, but the columns you need to swap are hard-coded in. And using the two middle columns is ambiguous if the array is not an even length.

Jiawei Gong on 5 May 2020 at 15:29

Can't understand test case 5. Can you improve this problem description?

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Solution 1779834

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George Iskander on 9 Apr 2019

You have mentioned that the input is 4X4 and then you tested on different dimensions. :(

Solution 1753463

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Perera Umesha on 18 Mar 2019

Problem title is misleading

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Problem 1321. Given a 4x4 matrix, swap the two middle columns

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Problem 1321. Given a 4x4 matrix, swap the two middle columns

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