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

1392 Solutions
466 Solvers

Last Solution submitted on Jul 26, 2020

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 104652

1 Comment

1 Comment

@bmtran (Bryant Tran) on 29 Jun 2012

clever!

Problem Recent Solvers466

Problem Tags

matrix manipulation

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers466

Suggested Problems

More from this Author3

Problem Tags

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

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers466

Suggested Problems

More from this Author3

Problem Tags

Players