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/
Filter AC, pass DC
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
04 - Scalar Equations 1
Divisible by 3
Count the Digits in the Box
Twist 'n' Match
When Was That Goal Scored?
Twins in a Window
Crossing to Kissing - Untangle the Lines
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