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

Created by Christopher

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Rotate input matrix (which will be square) 90 degrees counter-clockwise without using rot90,flipud,fliplr, or flipdim (or eval).

Example input: [ 1 2 3; 4 5 6; 7 8 9]

Example output: [ 3 6 9; 2 5 8; 1 4 7]

Because of simplistic regexp tests (sorry), you shouldn't use variable names or strings composed of the outlawed function names.

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Last Solution submitted on Jan 15, 2026

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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!

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

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

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Last 200 Solutions

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Problem Recent Solvers678

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