Hello,

I'm writing up some student notes about Matlab, and I'm including examples
of Matlab functions.  I'd like all the functions to be typeset in typewriter
font (which means using a "typing" environment), but I'd also like some
colorization.  For example, I want to display a function such as

function out = add(a,b)
%
% ADD(A,B) returns the sum of A and B
%
out = a+b;

in a frame, and with the three lines beginning with % all colored green.
(If I can color reserved words like "function" that's even better.)  What's
the easiest way to achieve this?

Thanks,
Alasdair

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