There's a problem is test#2.
you should write x and y_correct as vectors / x=[2 3 4] --> y_correct=[4 9 16]
When you write your problem, there's a section to actually test your test suite. What not do that before publishing the problem?
Sorry for inconvenience... now i have learnt to create problems...
Increment a number, given its digits
Calculate the area of a triangle between three points
Sum the 'edge' values of a matrix
Determine the Anti-diagonal of a Magic Square
design a magic matrix without using the command magic.
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