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/
Word Counting and Indexing
Convert a numerical matrix into a cell array of strings
Make an awesome ramp for a tiny motorcycle stuntman
Split a string into chunks of specified length
Back to basics - mean of corner elements of a matrix
Remove the air bubbles
Formatting currency numbers
Convert hex color specification to MATLAB RGB
Is this group simply connected?
Spot the outlier
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