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!
First non-zero element in each column
Fill a zeros matrix
Convert Fahrenheit to Celsius
Multivariate polynomials - sort monomials
Multivariate polynomials - emulate symbolic form
Product of two multivariate polynomials
Multivariate polynomials - overload multiplication
Find all vampire fangs
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