% REVSCHEDULE(S) returns the reverse of message passing schedule S. See the% function MPP for more information on message passing schedules.function R = revschedule (S)    % Get the number of edges.  m = length(S);    R = repmat(struct('i',0,'j',0),m,1);  for u = 1:m    i      = S(u).i;    j      = S(u).j;    v      = m-u+1;    R(v).i = j;    R(v).j = i;  end