%% User-defined Functions

%%
% We have created a function circle in the file |circle.m|
%
% To see what it's about we can type
help circle

%%
% If we just call circle with a scalar argument then the circumference (1st
% output) is returned
circle(5)

%%
% To get both values we use, e.g.,
[C A] = circle(5)

%%
% Vectorized usage:
[C A] = circle([2 4 6])

%% 
% And here's the entire code in |circle.m|
type circle
