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!
Which values occur exactly three times?
Number of Horns on a unicorn!
Area of rhombus
Area of an equilateral triangle
Area of a triangle
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - convert monomial form to array
Multivariate polynomials - overload multiplication
Outer product of multiple vectors
Find all vampire fangs
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