test cases imply that the question title should be "spot the square"
I added a rectangular (non-square) test case. Thanks for the note.
This is a good answer. I changed the test suite so that you wouldn't have to deal with logical input matrices. Sorry about that!
This code is referenced in the following blog post: http://blogs.mathworks.com/community/2015/01/19/robot-game-playing-in-matlab-part-2/
Better bullseye matrix
Mirror Image matrix across anti-diagonal
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Create a two dimensional zero matrix
Find the biggest empty box
Eliminate Polysyllabics: Long live short words!
Count the Digits in the Box
Twins in a Window
How long is the longest prime diagonal?
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