--- /dev/null
+## 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 choice of frequency-weighted grammians.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: December 2011
+## Version: 0.1
+
+function job = __modred_check_gram__ (choice, key)
+
+ if (! ischar (choice))
+ error ("modred: key '%s' requires string value", key);
+ endif
+
+ switch (tolower (choice (1)))
+ case "s" # standard
+ job = 0;
+ case "e" # enhanced
+ job = 1;
+ otherwise
+ error ("modred: key '%s' has an invalid value", key);
+ endswitch
+
+endfunction
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