Problem 19. Swap the first and last columns

Created by Cody Team

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Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All other columns should be left intact. Return the result in matrix B.
If the input has one column, the output should be identical to the input.
Example:
 Input  A =  [ 12  4   7
                5  1   4 ];
 Output B is [  7  4  12 
                4  1   5 ];

Solve

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Last Solution submitted on Apr 27, 2025

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18 Comments

18 Comments

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@bmtran (Bryant Tran) on 27 Jan 2012

need to fix the test suite

Ned Gulley on 30 Jan 2012

Updated the test so that fliplr will fail. Rescoring. Thanks for all the comments.

Jeevan Thomas on 9 Apr 2014

Check your test case. Test case with single dimension array is wrong

santosh singh on 20 Jul 2014

it can be done in many ways

Sukmock on 1 May 2016

Swapping the first and last columns means the input argument must have columns more than 1.
Thus, the solution, B=1 for A=1, cannot be accepted unless it is clearly written in the problem.

Tanmay Gamit on 13 Oct 2016

Test 3 B_correct is wrong: where, test B_correct=[3 5 0 2 1] it should be B_correct=[3 2 0 5 1]

Muhlis Ozdemir on 21 Apr 2017

nice one!

Rukmangadh Sai Myana on 29 May 2017

nice one!

zefeng chen on 17 Jun 2017

test 3 is right only 2 columns changed

Pavninder Deol on 19 Apr 2018

nice

Aliakbar Saifee on 26 Aug 2018

Why am I getting wrong answer for this [A(:,end),(:,2:end-1),(:,1)]

Sefercan Deniz on 13 Jun 2020

nice

berkay yilmaz on 13 Jun 2020

very nicee

Ajinkya Jadhav on 20 Aug 2020

nice

Madalyn Hague on 16 Mar 2022

good problem

Saicharan on 11 Jul 2022

Good problem.

Long Runjia Yu on 10 Feb 2024

very nice

VBBV on 5 Apr 2024

Good one

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Problem 19. Swap the first and last columns

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Problem 19. Swap the first and last columns

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