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Create local repository for matrix toolboxes. Step #0 done.
author Antonio Pino Robles <data.script93@gmail.com>
date Wed, 06 May 2015 14:56:53 +0200
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function f = fun_cos(x,k)
%FUN_COS

if nargin < 2 | k == 0
   f = cos(x);
else
   g = mod(ceil(k/2),2);
   h = mod(k,2);
   if h == 1
      f = sin(x)*(-1)^g; 
   else
      f = cos(x)*(-1)^g; 
   end
end