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!
Sum the elements in either diagonal of a square matrix
Generate a random matrix A of (1,-1)
Is the input divisible by 3?
Side of a rhombus
construct matrix with identical rows
Product of two multivariate polynomials
Outer product of multiple vectors
Multivariate polynomials - sort monomials
Multivariate polynomials - convert monomial form to array
Find all vampire fangs
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