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/
Back to basics 6 - Column Vector
What is the distance from point P(x,y) to the line Ax + By + C = 0?
select the primes of a vector
Find last zero for each column
Stuff the Board
Give a matrix that matches itself when rotated
Spot the outlier
Placing Beads Neatly in a Box
Generate a melodic contour string matrix
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