Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @ss / __sys_group__.m

diff --git a/octave_packages/control-2.3.52/@ss/__sys_group__.m b/octave_packages/control-2.3.52/@ss/__sys_group__.m
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+++ b/octave_packages/control-2.3.52/@ss/__sys_group__.m
@@ -0,0 +1,66 @@
+## Copyright (C) 2009, 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 -*-
+## Block diagonal concatenation of two SS models.
+## This file is part of the Model Abstraction Layer.
+## For internal use only.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: September 2009
+## Version: 0.2
+
+function retsys = __sys_group__ (sys1, sys2)
+
+  if (! isa (sys1, "ss"))
+    sys1 = ss (sys1);
+  endif
+
+  if (! isa (sys2, "ss"))
+    sys2 = ss (sys2);
+  endif
+
+  retsys = ss ();
+  retsys.lti = __lti_group__ (sys1.lti, sys2.lti);
+
+  n1 = rows (sys1.a);
+  n2 = rows (sys2.a);
+  
+  [p1, m1] = size (sys1.d);
+  [p2, m2] = size (sys2.d);
+
+  retsys.a = [sys1.a, zeros(n1,n2); zeros(n2,n1), sys2.a];
+  retsys.b = [sys1.b, zeros(n1,m2); zeros(n2,m1), sys2.b];
+  retsys.c = [sys1.c, zeros(p1,n2); zeros(p2,n1), sys2.c];
+  retsys.d = [sys1.d, zeros(p1,m2); zeros(p2,m1), sys2.d];
+
+  e1 = ! isempty (sys1.e);
+  e2 = ! isempty (sys2.e);
+
+  if (e1 || e2)
+    if (e1 && e2)
+      retsys.e = [sys1.e, zeros(n1,n2); zeros(n2,n1), sys2.e];
+    elseif (e1)
+      retsys.e = [sys1.e, zeros(n1,n2); zeros(n2,n1), eye(n2)];
+    else
+      retsys.e = [eye(n1), zeros(n1,n2); zeros(n2,n1), sys2.e];
+    endif
+  endif
+
+  retsys.stname = [sys1.stname; sys2.stname];
+
+endfunction
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