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/
Find relatively common elements in matrix rows
Project Euler: Problem 1, Multiples of 3 and 5
Getting the row and column location from a matrix
Determine the number of odd integers in a vector
Fibonacci-Sum of Squares
How long is the longest prime diagonal?
Cell Counting: How Many Draws?
Spot the outlier
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