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## Copyright (C) 2010 Lukas F. Reichlin
##
## This file is part of LTI Syncope.
##
## LTI Syncope 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.
##
## LTI Syncope 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 LTI Syncope. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## Common code for adjusting SS model data.
## Used by @ss/ss.m, others possibly follow.
## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
## Created: October 2010
## Version: 0.1
function [a, b, c, d, tsam] = __adjust_ss_data__ (a, b, c, d, tsam);
if (isempty (a)) # static system
a = []; # avoid [](nx0) or [](0xn)
tsam = -2;
endif
if (isempty (d))
if (isempty (c)) # ss (a, b), ss (a, b, [], [], ...)
c = eye (size (a));
d = zeros (rows (a), columns (b));
else # ss (a, b, c), ss (a, b, c, [], ...)
d = zeros (rows (c), columns (b));
endif
endif
if (isempty (b) && isempty (c)) # sys = ss ([], [], [], d)
b = zeros (0, columns (d));
c = zeros (rows(d), 0);
tsam = -2;
endif
endfunction
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