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/
Angle between Two Vectors
Is it an Armstrong number?
Is the input divisible by 3?
Maximum value in a matrix
Find the Final State of an Abelian Sandpile
Rotate and display numbered tile
Make a run-length companion vector
Make a function that returns its own character count
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