# Copyright (c) P.J.Gawthrop 1991, 1992, 1994.

###############################################################
## Version control history
###############################################################
## $Id$
## $Log$
## Revision 1.3  1998/03/03 09:02:46  peterg
## Replaced MTTEyx*MTTEdX + MTTEyu*MTTdu; term
##
## Revision 1.2  1997/08/26 08:22:36  peterg
## Changed
## MTTY := MTTY + MTTEyx*MTTdX + MTTEyu*MTTdu;
## to
## MTTY := MTTY + MTTEyx*MTTEdX + MTTEyu*MTTdu;
##
## This sorts out the problem when dz appears in the output equation.

OFF Echo;
OFF Nat;
ON NERO;

in "$1_def.r";
MTTdxs := MTTdX;  %Save the symbolic form of dX

in "$1_sympar.r";
in "$1_subs.r";
in "$1_dae.r";


%Create F_x, F_y matrices - assumming equations are linear in dZ
IF MTTNz>0 THEN 
BEGIN
% Find MTTFx;

  MTTdZ18 := 0;
  MTTdZ19 := 0;

MTTEdX := MTTdX; %Ie MTTEdX is MTTdX with the dz terms deleted ie EdX.
MTTdX := MTTdXs;  %Restore the symbolic dX



MTTY := MTTY + MTTEyx*MTTEdX;
%%% This causes the matrix mismatch
%%% MTTdXs and MTTdu need setting in _def.r file
MTTY := MTTY + MTTEyx*MTTEdX + MTTEyu*MTTdu;
%%%%%%MTTY := MTTY + MTTEyx*(MTTE^(-1))*MTTEdX;
%%MTTY := MTTY +  MTTEyu*MTTdu;
MTTY := MTTY + MTTEyx*(MTTE^(-1))*MTTEdX;





END; %%of MTTNz>0


IF MTTNz=0 THEN 
BEGIN
  MTTEdX := MTTdX;
  MTTE   := MTTI;
END;

%IF MTTNyz>0 THEN 
%BEGIN
%  %%%% Try and solve algebraic loops!!
%
%  %Create list of the relevant equations 
%  MTT_eqns := {};
%  FOR i := 1:MTTNyz DO
%    MTT_eqns := append(MTT_eqns,{MTTyz(i,1)});
%
%  %Create list of the relevant unknowns
%  MTT_unknowns := {};
%  FOR i := 1:MTTNyz DO
%    MTT_unknowns := append(MTT_unknowns,{MTTUi(i,1)});
%
%  %Solve the algebraic equations symbolically
%  MTT_sol := solve(MTT_eqns,MTT_unknowns);
%
%  %Substitute back into the equations
%  FOR i := 1:MTTNyz DO
%  BEGIN
%    MTT_sol_i := first(MTT_sol); MTT_sol := rest(MTT_sol);
%    set(lhs(MTT_sol_i),rhs(MTT_sol_i));
%  END;
%
%END; % IF MTTNyz>0

%%Create the _cse.r file
OUT "$1_cse.r";

IF MTTNx>0 THEN
BEGIN
  write "matrix MTTEdX(", MTTNx, ",1)";
END;

  IF MTTNx>0 THEN IF MTTNy>0 THEN
  BEGIN
    write "matrix MTTEyx(", MTTNy, ",", MTTNx, ")";
  END;
  MTTEyx := MTTEyx;
%%%%%  MTTdU := MTTdU;
END;

IF MTTNyz>0 THEN
  BEGIN
  write "matrix MTTYz(", MTTNyz, ",1)";
   MTTYz := MTTYz;
  END;


write ";END;";

SHUT "$1_cse.r";
quit;

EOF

# Now invoke the standard error handling.
mtt_error_r dae2cse_r.log