function structure = AF_eqn(name,bond_number,bonds,direction,cr,args, ...
structure,eqnfile);
% AF_eqn - equations for flow amplifier
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %%%%% Model Transformation Tools %%%%%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Matlab function AF_eqn
% structure = AF_eqn(bond_number,bonds,direction,cr,args, ...
% structure,eqnfile);
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Copyright (c) P.J. Gawthrop, 1996.
if nargin<6
eqnfile = 'stdout';
end;
% Check that there are exactly two bonds.
if check_bonds(bonds,2,'AF')==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);
% Effort on port 1 is always zero
fprintf(eqnfile, '%s := 0;\n', ...
varname(name,bond_number(1), 1));
LHS_cause = -1;
RHS_cause = -1;
if f_2 == 1 % Unicausal: f_2 := f_1
LHS_number = bond_number(2);
RHS_number = bond_number(1);
else % Bicausal: f_1 := f_2
LHS_number = bond_number(1);
RHS_number = bond_number(2);
end
oneeqn(name,LHS_number,LHS_cause,RHS_number,RHS_cause,cr,args,eqnfile);