Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / __adjust_ss_data__.m

diff --git a/octave_packages/control-2.3.52/__adjust_ss_data__.m b/octave_packages/control-2.3.52/__adjust_ss_data__.m
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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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