function cost_update( t, vnum)
%
% update Viterbi cost function
%
% R. Perry, June 2001
%
% disp(sprintf( '\ncost_update: t = %g, vnum = %g\n', t, vnum));

global TYPE;

if( TYPE == 30) % multi-user, Gauss-Markov

  % ...

elseif(TYPE ==40) % multi-user, GM separate trellis

%...

else

  error( 'get_cost: unknown TYPE');

end
