X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fcontrol-2.3.52%2F__modred_check_alpha__.m;fp=octave_packages%2Fcontrol-2.3.52%2F__modred_check_alpha__.m;h=dbc5d467ef6fb73d16702504427297eb5682e7d3;hp=0000000000000000000000000000000000000000;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/control-2.3.52/__modred_check_alpha__.m b/octave_packages/control-2.3.52/__modred_check_alpha__.m
new file mode 100644
index 0000000..dbc5d46
--- /dev/null
+++ b/octave_packages/control-2.3.52/__modred_check_alpha__.m
@@ -0,0 +1,40 @@
+## Copyright (C) 2011   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 -*-
+## check alpha for model reduction commands
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: November 2011
+## Version: 0.1
+
+function alpha = __modred_check_alpha__ (alpha, dt)
+
+  if (! is_real_scalar (alpha))
+    error ("modred: argument alpha must be a real scalar");
+  endif
+  if (dt)  # discrete-time
+    if (alpha < 0 || alpha > 1)
+      error ("modred: require 0 <= ALPHA <= 1");
+    endif
+  else     # continuous-time
+    if (alpha > 0)
+      error ("modred: require ALPHA <= 0");
+    endif
+  endif
+
+endfunction