% This function defines the operation of three-input multiplexer.
% INPUT: 
%       a1: the stochastic sequence of the first input for the mux; 
%       a2: the stochastic sequence of the second input for the mux;
%		a3: the stochastic sequence of the third input for the mux;
%		a4: the stochastic sequence of the first selection input for the mux;
%		a5: the stochastic sequence of the second selection input for the mux;
% OUTPUT: 
%       a: the stochastic sequence of the output for the mux.
% Copyright @ The authors, 2012.
function a= mux3(a1,a2,a3,a4,a5)          
   a=a1.*(1.-a4).*(1.-a5)+a2.*(1.-a4).*a5+a3.*a4.*(1.-a5);