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

Created by Harish Maradana

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>If</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ a = [1 2 3 4; 1 2 3 4; 1 2 3 4; 1 2 3 4];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then the result is</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ ans =\n\n     1     3     2     4\n     1     3     2     4\n     1     3     2     4\n     1     3     2     4]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Perform a simple swap of the two middle columns.</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

1130 Solutions
516 Solvers

Last Solution submitted on Jan 17, 2021

Last 200 Solutions

Problem Comments

5 Comments

5 Comments

Show 2 older comments

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

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

Tahmina Tabassum Treena 10 hours and 16 minutes ago

This question should be corrected as the test cases are not 4*4 in all cases.

Solution Comments

Solution 1779834

2 Comments

2 Comments

George Iskander on 9 Apr 2019

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

aanotAA on 7 Sep 2020

Can i check the answer again after submit?and where

Solution 1753463

1 Comment

1 Comment

Perera Umesha on 18 Mar 2019

Problem title is misleading

Problem Recent Solvers516

Problem Tags

swap

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers516

Suggested Problems

More from this Author13

Problem Tags

Community Treasure Hunt

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers516

Suggested Problems

More from this Author13

Problem Tags

Community Treasure Hunt

Players