function structure = AE_eqn(name,bond_number,bonds,direction,cr,args, ...
structure,eqnfile);
% AE_eqn. Equation generation for effort amplifier.
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %% Revision 1.4 1996/09/10 10:10:41 peter
% %% Now uses eqaution.m to format the equation.
% %%
% %% Revision 1.3 1996/08/30 19:03:10 peter
% %% Added argument check.
% %% Added extra name argument.
% %%
% %% Revision 1.2 1996/08/30 13:23:11 peter
% %% Added bond number check
% %%
% %% Revision 1.1 1996/08/22 13:12:34 peter
% %% Initial revision
% %%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
if nargin<6
eqnfile = 'stdout';
end;
% Check that there are exactly two bonds.
if check_bonds(bonds,2,'AE')==0
return
end
% There are 2 ports; extract the information
e_1 = bonds(1,1);
f_1 = bonds(1,2);
e_2 = bonds(2,1);
f_2 = bonds(2,2);
% Flow on port 1 is always zero
fprintf(eqnfile, '%s := 0;\n', ...
varname(name,bond_number(1), -1));
outcause = 1;
incause = 1;
if e_2 == -1 % Unicausal: e_2 := e_1
outbond = bond_number(2);
inbond = bond_number(1);
outport = 2;
inport = 1;
else % Bicausal: e_1 := e_2
outbond = bond_number(1);
inbond = bond_number(2);
outport = 1;
inport = 2;
end
eqn = equation("AE",name,cr,args,outbond,outcause,outport, ...
inbond,incause,inport);
fprintf(eqnfile, '%s',eqn);