Problem 151. Magic!

Created by the cyclist

Solve Later

Check whether the input matrix is a normal magic square:
http://en.wikipedia.org/wiki/Magic_square
Output the logical value true or false.

Solve

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Last Solution submitted on Jun 19, 2025

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David Young on 22 Feb 2012

This could be improved with a better test suite. For example, flipud(magic(n)) is still magical, but most of the leading solutions would return false for this.

Geoff on 19 Mar 2012

Yes, test suite is substandard. Could have drawn from this: http://nrich.maths.org/1338

anhendri on 7 Mar 2013

Why is magic(2) not a magic square ?

the cyclist on 8 Mar 2013

I was not notified about some of the older comments, so was unaware of some of the weaknesses of the test suite, and the "gamed" solutions. I have substantially improved the test suite.

the cyclist on 8 Mar 2013

The MATLAB command magic(2), although it does produce output, is not a magic square, according to the definition. (There is no 2x2 magic square.)

Dyuman Joshi on 7 Feb 2023

Test cases have been added to the problem.

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Problem 151. Magic!

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Last 200 Solutions

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Problem 151. Magic!

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Last 200 Solutions

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Problem Recent Solvers298

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