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!
Project Euler: Problem 10, Sum of Primes
Is the Point in a Circle?
Getting the row and column location from a matrix
Determine if input is a perfect number
Switch matrix to a column vector
Fangs of a vampire number
Multivariate polynomials - sort monomials
Product of two multivariate polynomials
Multivariate polynomials - overload multiplication
Outer product of multiple vectors
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