Function lsim_mod, replace "abs" by "absc" in lines 233 and 234.

Error in an "==" test ([1 1] == 1 is true!) : the first block of defin_vw.m
should be replaced by:
   [af,bf,cf,df] = ssdata(sys);
   [n_etat,n_com] = size(bf);
   [n_mes,na] = size(cf);
   if cf == 1 & n_mes == 1 & na == 1; cf = eye(n_etat,n_etat); end;
   [n_mes,na] = size(cf);
   if df == 0; df = zeros(n_mes,n_com); end;