Write a function that has the following property: f(f(x)) = -x for any numeric array x.
Note that there is no restriction on the output for f(x). How bizarre can you make it?
This one really surprised me.
Getting a little silly!
Sorted highest to lowest?
Sum of diagonal of a square matrix
select the primes of a vector
Number of odd and even elements within matrix
Find the hypotenuse
Product of two multivariate polynomials
Multivariate polynomials - sort monomials
Find all vampire fangs
Multivariate polynomials - emulate symbolic form
Outer product of multiple vectors
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