I think the test suite is broken, I appear to only get x = [21,6;35,10] as the input and y is being displayed as a vector instead of the matrix that is returned. So either the return is being compared to an x that was not sent or y being a vector is causing the test cases to always fail.
Andrew, I just tried resubmitting my original solution, and the test suite was OK. What is the exact problem that you're having with the test suite when you submit your solution?
Test suite compares y to itself--should compare y to x.
Hah! Great catch. It's fixed now, but you still get a like for being so sneaky...
Which values occur exactly three times?
Calculate the Levenshtein distance between two strings
Check to see if a Sudoku Puzzle is Solved
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
High Precision Square Root (Inspired by Project Euler 80)
Return elements unique to either input
Rewrite setdiff to account for non-unique values
Breaking Out of the Matrix
Rolling maximums above a threshold
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