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!
Bottles of beer
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Getting logical indexes
Return the first and last character of a string
Calculate the derivative of a polynomial
Multivariate polynomials - sort monomials
Multivariate polynomials - emulate symbolic form
Fangs of a vampire number
Find vampire numbers
Multivariate polynomials - convert monomial form to array
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