# Structure matrix [states,nonstates,inputs,outputs,zero_outputs]

# ###############################################################
# ## Version control history
# ###############################################################
# ## $Id$
# ## $Log$
# ## Revision 1.31  1998/09/24 12:57:44  peterg
# ## Now ignores aliasing if no arguments given.
# ##
# ## Revision 1.30  1998/09/02 11:14:23  peterg
# ## Revised to use ordered lists of subsystems and ports
# ##
# ## Revision 1.29  1998/08/25 09:22:34  peterg
# ## Correctely recognises port SSs its now easy -- they are in there own
# ## field
# ##

#  # Find number of components
#  [n_components,columns] = size(components);
#  n_components = n_components
  
  # Set up the first dummy bond number - needed for repetative components
#  next_bond = max(max(abs(components)))+1;
    next_bond = n_bonds+1;

  # Set up the counters for the labelled SS. These are, by definition,
  # encountered first and so the counters will not be messed up by subsystems.
  local_u_index = 0;
  local_y_index = 0;

  if (length(system_args)==0)