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!
Times 2 - START HERE
What is the distance from point P(x,y) to the line Ax + By + C = 0?
poll: would you like the regexp (?@cmd) functionality to be banned in Cody?
Are you in XY plane?
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - sort monomials
Fangs of a vampire number
Multivariate polynomials - convert monomial form to array
Outer product of multiple vectors
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