Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / control-2.3.52 / @lti / connect.m

diff --git a/octave_packages/control-2.3.52/@lti/connect.m b/octave_packages/control-2.3.52/@lti/connect.m
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+## Copyright (C) 2009   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 -*-
+## @deftypefn {Function File} {@var{sys} =} connect (@var{sys}, @var{cm}, @var{inputs}, @var{outputs})
+## Arbitrary interconnections between the inputs and outputs of an LTI model.
+## @end deftypefn
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.1
+
+function sys = connect (sys, cm, in_idx, out_idx)
+
+  if (nargin != 4)
+    print_usage ();
+  endif
+
+  [p, m] = size (sys);
+  [cmrows, cmcols] = size (cm);
+
+  ## TODO: proper argument checking
+  ## TODO: name-based interconnections
+  ## TODO: replace nested for-if statement
+
+  if (! is_real_matrix (cm))
+    error ("connect: second argument must be a matrix with real coefficients");
+  endif
+
+  M = zeros (m, p);
+  in = cm(:, 1);
+  out = cm(:, 2:cmcols);
+
+  for a = 1 : cmrows
+    for b = 1 : cmcols-1
+      if (out(a, b) != 0)
+        M(in(a, 1), abs (out(a, b))) = sign (out(a, b));
+      endif
+    endfor
+  endfor
+
+  sys = __sys_connect__ (sys, M);
+  sys = __sys_prune__ (sys, out_idx, in_idx);
+
+endfunction
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