precision issues, a single test case, meaningless "not using built-in functions" limitation, and somewhat taunting "have a pride" exhortation... please do the same and put some more thought into your problem
Updated TSuite now
Humm. the test suite is actually requesting Gaussian elimination, not LU decomposition. You may check it by using [L,U] = lu(x). They are very similar processes, but not exactly the same.
Not a built in function, but still a very cheesy answer! :-)
I see you! hahahaha
Remove any row in which a NaN appears
Determine if a Given Number is a Triangle Number
Find the nearest integer
Encode Me From The Past
Rotate matrix by -90 degrees
Some tweaks in summation, Can you decode? :)
Modified Upper Matrix Mock
Beat the test suite if you can :)
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