% Usage: y = myfunc(x)
% Example of a user-defined function
%
% Input:
% x - argument
%
% Output:
% y - function value
%
% Examples:
% y=myfunc(x);
% r=trap(@myfunc,0,1,10);
% r=d1fd2p(@myfunc,0,0.1);

function a=myfunc(x)
a = sin(x)-cos(x);