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...
Getting the indices from a vector
sum of non-primes
What is Sum Of all elements of Matrix
Solving Quadratic Equations (Version 1)
Determine the Anti-diagonal of a Magic Square
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