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## Copyright (C) 1996, 2000, 2002, 2003, 2004, 2005, 2006, 2007
## Auburn University. All rights reserved.
##
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{dsys}, @var{adc}, @var{cdc}] =} sysdisc (@var{sys})
##
## @strong{Input}
## @table @var
## @item sys
## System data structure.
## @end table
##
## @strong{Outputs}
## @table @var
## @item dsys
## Purely discrete portion of sys (returned empty if there is
## no purely discrete path from inputs to outputs).
## @item adc
## @itemx cdc
## Connections from continuous states to discrete states and discrete
## outputs, respectively.
## @end table
## @end deftypefn
function [dsys, Adc, Cdc] = sysdisc (sys)
if (nargin != 1)
print_usage ();
elseif (! isstruct (sys))
error ("sys must be in system data structure form");
endif
sys = sysupdate (sys, "ss");
[n_tot, st_c, st_d, y_c, y_d] = __syscont_disc__ (sys); # get ranges
## assume there's nothing there; build partitions as appropriate
Add = Adc = Bdd = Cdd = Cdc = Ddd = [];
if (isempty (st_d) && isempty (y_d))
error ("sysdisc: expecting discrete states and/or continuous outputs");
elseif (isempty (st_d))
warning ("sysdisc: no discrete states");
elseif (isempty (y_d))
warning ("sysdisc: no discrete outputs");
endif
[aa, bb, cc, dd] = sys2ss (sys);
if (! isempty(st_d))
Add = aa(st_d,st_d);
stname = sysgetsignals (sys, "st", st_d);
Bdd = bb(st_d,:);
if (! isempty (st_c))
Adc = aa(st_d,st_c);
endif
if (! isempty (y_d))
Cdd = cc(y_d,st_d);
endif
else
stname = [];
endif
if (! isempty (y_d))
Ddd = dd(y_d , :);
outname = sysgetsignals (sys, "out", y_d);
if (! isempty (st_c))
Cdc = cc(y_d,st_c);
endif
else
outname = [];
endif
inname = sysgetsignals (sys, "in");
outlist = 1:rows(outname);
if (! isempty (outname))
tsam = sysgettsam (sys);
[nc, nz] = sysdimensions (sys);
dsys = ss (Add, Bdd, Cdd, Ddd, tsam, 0, nz, stname, inname,
outname, outlist);
else
dsys = [];
endif
endfunction
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