Check whether the input matrix is a normal magic square:
Output the logical value true or false.
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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.
Yes, test suite is substandard. Could have drawn from this: http://nrich.maths.org/1338
Why is magic(2) not a magic square ?
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 MATLAB command magic(2), although it does produce output, is not a magic square, according to the definition. (There is no 2x2 magic square.)
Test cases have been added to the problem.