Index: mttroot/mtt/lib/comp/simple/SS_eqn.m
==================================================================
--- mttroot/mtt/lib/comp/simple/SS_eqn.m
+++ mttroot/mtt/lib/comp/simple/SS_eqn.m
@@ -4,10 +4,13 @@
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % %% Version control history
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % %% $Id$
 % %% $Log$
+% %% Revision 1.2  1996/08/08 16:38:19  peter
+% %% Changed to filenumer type of fprintf
+% %%
 % %% Revision 1.1  1996/08/08 16:19:08  peter
 % %% Initial revision
 % %%
 % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -15,13 +18,22 @@
 % The string 'cr' contains the effort attributes;  
 % 'arg' contains the flow attributes. 
 % external indicates an external variable
 % internal indicates an internal variable
 % anything else is the name of a constant.
+% Blank is taken to be external
 
 effort_attribute = cr;
 flow_attribute = args;
+
+if length(effort_attribute)==0
+  effort_attribute = 'external';
+end;
+
+if length(flow_attribute)==0
+  flow_attribute = 'external';
+end;
 
 inputs = structure(3);
 outputs = structure(4);
 
 % Effort