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function structure =  SS_eqn(name,bond_number,bonds,direction,cr,args, ...
function structure =  SS_eqn(name,Bond_number,Bonds,Direction,cr,args, ...
    structure,filenum);

% Set up globals to count the component inputs and outputs. This relies on
% the named SS (the ports) being in the correct order. Using globals here
% avoids changing the common argument list for all _eqn files for something
% which is only used for named SS components.
global local_u_index
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% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %% Revision 1.20  1998/07/08 14:42:52  peterg
% %% Removed the annoying info message - it causes problems with big
% %% systems
% %%
% %% Revision 1.19  1998/07/08 11:33:54  peterg
% %% Replace mtt_info by mtt_error when appropriate
% %%
% %% Revision 1.18  1998/07/08 11:30:45  peterg
% %% Removed second (fileID) argument from mtt_info
% %%
% %% Revision 1.17  1998/07/04 07:15:44  peterg
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  effort_attribute = 'external';
end;

if strcmp(flow_attribute,'')
  flow_attribute = 'external';
end;


inputs = structure(3);
outputs = structure(4);
zero_outputs = structure(5);
unknown_inputs = structure(6);

% Is it a named port? (Name begins with [)
Named_Port = (name(1)=='[');

if Named_Port
  
n_bonds = length(Bond_number)	# Multi port?
for i=1:n_bonds			# Loop over all the bonds
  bond_number = Bond_number(i);
  bonds = Bonds(i,:);
  direction = Direction(i,:);
  
  Named_Port = name(1)=="[";	
  
  if Named_Port	# Is it a named port?	
  % Strip the [
  name = name(2:length(name));
end;

if Named_Port&&~at_top_level % It's a named port
    sname = name(2:length(name)); #Strip the [
  end;			
  
  if Named_Port&&~at_top_level % It's a named port

% Note: we don't have numbered ports now, so the correct indices are deduced
% by incrementing the two globals: local_u_index and local_y_index
% $$$   % Convert string to number
% $$$   % port_number = abs(flow_attribute)-abs('0');
% $$$   % port_number = str2num(flow_attribute);

% $$$   %Compute port number
% $$$   str_port_number = flow_attribute;
% $$$   N_string = length(str_port_number);
% $$$   port_number=0;
% $$$   for i=1:N_string
% $$$     port_number = 10*port_number + abs(str_port_number(i))-abs('0');
% $$$   end;

  % Effort 
  if bonds(1,1)==-1 % Source
    local_u_index = local_u_index + 1;
    fprintf(filenum, '%s := %s_MTTu%d;\n', ...
        varname(name, bond_number,1), name, local_u_index);
  else % Sensor
    local_y_index = local_y_index + 1;
    fprintf(filenum, '%s_MTTy%d := %s;\n', ...
        name, local_y_index, varname(name, bond_number,1));
  end;
  % Flow 
  if bonds(1,2)==1 % Source
    local_u_index = local_u_index + 1;
    % Effort 
    if bonds(1,1)==-1 % Source
      local_u_index = local_u_index + 1
      fprintf(filenum, "%s := %s_MTTu%d;\n", ...
              varname(sname, bond_number,1), sname, local_u_index);
    else % Sensor
      local_y_index = local_y_index + 1
      fprintf(filenum, "%s_MTTy%d := %s;\n", ...
              sname, local_y_index, varname(sname, bond_number,1));
    end;
    % Flow 
    if bonds(1,2)==1 % Source
      local_u_index = local_u_index + 1
      fprintf(filenum, "%s := %s_MTTu%d;\n", ...
              varname(sname, bond_number,-1), sname, local_u_index);
    else % Sensor
      local_y_index = local_y_index + 1
    fprintf(filenum, '%s := %s_MTTu%d;\n', ...
        varname(name, bond_number,-1), name, local_u_index);
  else % Sensor
    local_y_index = local_y_index + 1;
    fprintf(filenum, '%s_MTTy%d := %s;\n', ...
        name, local_y_index, varname(name, bond_number,-1));
  end;  
      fprintf(filenum, "%s_MTTy%d := %s;\n", ...
              sname, local_y_index, varname(sname, bond_number,-1));
    end;  
  return
end;

% Now do SS which are not ports.
% Effort
if strcmp(effort_attribute, 'external')
  if bonds(1,1)==-1 % Source
    inputs = inputs+1;
    fprintf(filenum, '%s := MTTu(%d,1);\n', ...
	varname(name, bond_number,1),inputs);
  else % Sensor
    outputs = outputs+1;
  else				# Now do SS which are not ports
    % Effort
    if strcmp(effort_attribute, "external")
      if bonds(1,1)==-1 % Source
	inputs = inputs+1;
	fprintf(filenum, "%s := MTTu(%d,1);\n", ...
		varname(name, bond_number,1),inputs);
      else % Sensor
	outputs = outputs+1;
	fprintf(filenum, "MTTy(%d,1) := %s;\n", ...
		outputs, varname(name, bond_number,1));
      end;
    elseif strcmp(effort_attribute, "unknown") % Unknown input
      unknown_inputs = unknown_inputs + 1;
    fprintf(filenum, 'MTTy(%d,1) := %s;\n', ...
	outputs, varname(name, bond_number,1));
  end;
elseif strcmp(effort_attribute, 'unknown') % Unknown input
  unknown_inputs = unknown_inputs + 1;
  fprintf(filenum, '%s := MTTUi%d;\n', ...
      varname(name, bond_number,1), unknown_inputs);
elseif strcmp(effort_attribute, 'internal')
  % Do nothing
else 
  if bonds(1,1)==-1 % Named or unknown source
    fprintf(filenum, '%s := %s;\n', ...
	varname(name, bond_number,1), effort_attribute);
  else % Sensor
    if strcmp(effort_attribute, 'zero') %Zero output
      zero_outputs = zero_outputs + 1;
      fprintf(filenum, 'MTTyz%d := %s;\n', ...
	  zero_outputs, varname(name, bond_number,1));
    else
      mtt_error([effort_attribute, ' not appropriate for an output ']);
    end;
  end;
end;
  
% Flow
if strcmp(flow_attribute, 'external')
  if bonds(1,2)==1 % Source
    inputs = inputs+1;
    fprintf(filenum, '%s := MTTu(%d,1);\n', varname(name, bond_number,-1),inputs);
  else % Sensor
    outputs = outputs+1;
    fprintf(filenum, 'MTTy(%d,1) := %s;\n', outputs, ...
	varname(name, bond_number,-1));
  end;
elseif strcmp(flow_attribute, 'unknown') % Unknown input
  unknown_inputs = unknown_inputs + 1;
  fprintf(filenum, '%s := MTTUi%d;\n', ...
      varname(name, bond_number,-1), unknown_inputs);
elseif strcmp(flow_attribute, 'internal')
  % Do nothing
else % Named constant
  if bonds(1,2)==1 % Source
    fprintf(filenum, '%s := %s;\n', ...
	varname(name, bond_number,-1), flow_attribute);
  else % Sensor
    if strcmp(flow_attribute, 'zero') %Zero output
      zero_outputs = zero_outputs + 1;
      fprintf(filenum, 'MTTyz%d := %s;\n', ...
	  zero_outputs, varname(name, bond_number,-1));
    else
      mtt_error([flow_attribute, ' not appropriate for an output ']);
    end;
  end;
end;

structure(3) = inputs;
structure(4) = outputs;
structure(5) = zero_outputs;
structure(6) = unknown_inputs;
      fprintf(filenum, "%s := MTTUi%d;\n", ...
	      varname(name, bond_number,1), unknown_inputs);
    elseif strcmp(effort_attribute, "internal")
      % Do nothing
    else 
      if bonds(1,1)==-1 % Named or unknown source
	fprintf(filenum, "%s := %s;\n", ...
		varname(name, bond_number,1), effort_attribute);
      else % Sensor
	if strcmp(effort_attribute, "zero") %Zero output
	  zero_outputs = zero_outputs + 1;
	  fprintf(filenum, "MTTyz%d := %s;\n", ...
		  zero_outputs, varname(name, bond_number,1));
	else
	  mtt_error([effort_attribute, " not appropriate for an output "]);
	end;
      end;
    end;
    
    % Flow
    if strcmp(flow_attribute, "external")
      if bonds(1,2)==1 % Source
	inputs = inputs+1;
	fprintf(filenum, "%s := MTTu(%d,1);\n", varname(name, bond_number,-1),inputs);
      else % Sensor
	outputs = outputs+1;
	fprintf(filenum, "MTTy(%d,1) := %s;\n", outputs, ...
		varname(name, bond_number,-1));
      end;
    elseif strcmp(flow_attribute, "unknown") % Unknown input
      unknown_inputs = unknown_inputs + 1;
      fprintf(filenum, "%s := MTTUi%d;\n", ...
	      varname(name, bond_number,-1), unknown_inputs);
    elseif strcmp(flow_attribute, "internal")
      % Do nothing
    else % Named constant
      if bonds(1,2)==1 % Source
	fprintf(filenum, "%s := %s;\n", ...
		varname(name, bond_number,-1), flow_attribute);
      else % Sensor
	if strcmp(flow_attribute, "zero") %Zero output
	  zero_outputs = zero_outputs + 1;
	  fprintf(filenum, "MTTyz%d := %s;\n", ...
		  zero_outputs, varname(name, bond_number,-1));
	else
	  mtt_error([flow_attribute, " not appropriate for an output "]);
	end;
      end;
    end;
  end;
  structure(3) = inputs;
  structure(4) = outputs;
  structure(5) = zero_outputs;
  structure(6) = unknown_inputs;
  
end;
MTT: Model Transformation Tools
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