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/
Column norms of a matrix
Fill a zeros matrix
Make a logical diamond using GALLERY function
Back to basics - mean of corner elements of a matrix
Cell Counting: How Many Draws?
How long is the longest prime diagonal?
Find the stride of the longest skip sequence
Eliminate Polysyllabics: Long live short words!
Count the Digits in the Box
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