Problem 798. Rotate input square matrix 90 degrees CCW without rot90

Created by Christopher

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","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\"?><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>Rotate input matrix (which will be square) 90 degrees counter-clockwise without using rot90,flipud,fliplr, or flipdim (or eval).</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Example input: [ 1 2 3; 4 5 6; 7 8 9]</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Example output: [ 3 6 9; 2 5 8; 1 4 7]</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/><w:jc w:val=\"left\"/></w:pPr><w:r><w:t>Because of simplistic regexp tests (sorry), you shouldn't use variable names or strings composed of the outlawed function names.</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

1668 Solutions
420 Solvers

Last Solution submitted on Jan 11, 2022

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Jean-Marie Sainthillier on 19 Jul 2012

What is the difference between A' and A.' ?

Freddy on 19 Jul 2012

A' : ctranspose(A): complex conjugate transpose
A.': transpose(A): non-conjugate transpose

for more information: 'help (c)transpose'

Christian Schröder on 9 Jul 2019

Good one!

Solution Comments

Solution 4480557

1 Comment

1 Comment

Md. Saif Ansari on 28 Dec 2020

Why test case - 3 is not able to pass. I had to hardcode it !!

Solution 104652

1 Comment

1 Comment

@bmtran (Bryant Tran) on 29 Jun 2012

clever!

Problem Recent Solvers420

Problem Tags

matrix manipulation

Community Treasure Hunt

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

Start Hunting!

Problem 798. Rotate input square matrix 90 degrees CCW without rot90

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers420

Suggested Problems

More from this Author3

Problem Tags

Community Treasure Hunt

Problem 798. Rotate input square matrix 90 degrees CCW without rot90

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers420

Suggested Problems

More from this Author3

Problem Tags

Community Treasure Hunt

Players