better to describe input size: xy 4-by-2, each row is the xy-coordinate of a point
Needs a richer test suite. A lot of "solvers" have just put a=7 as the "solution", but although this satisfies the single test case, it doesn't solve the problem as stated.
This could be quite a good solution, if you removed the "x = 7; %" part and just left what is now a comment. As it is, although it satisfies the test case, it doesn't actually solve the problem.
... though, just to be clear, the comment wouldn't be quite right, it still needs a little adjustment.
Sums with Excluded Digits
Project Euler: Problem 5, Smallest multiple
Project Euler: Problem 9, Pythagorean numbers
Back to basics 6 - Column Vector
Switch matrix to a column vector
Find the outlier in a set of samples
Acid and water
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