>> f = x -> (1 - x) / (1 + x + x^2)A defined function can be called in the usual way
>> f = x -> (1 - x) / (1 + x + x^2) user defined function >> f(-1) -2
A function can have several variables
>> f = (r, theta) -> r * (1 + cos(theta)); >> f(2, pi) 0
More complicated functions have to be defined using the keyword function.