--- /dev/null
+## 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 -*-
+## Return default labels if cell "name" contains only empty strings.
+## If not, check whether individual strings of the cell "name" are
+## empty and mark them with "?". Used by display routines.
+
+## Author: Lukas Reichlin <lukas.reichlin@gmail.com>
+## Created: October 2009
+## Version: 0.3
+
+function [name, n] = __labels__ (name, variable = "x")
+
+ n = numel (name);
+
+ if (n == 0 || isequal ("", name{:}))
+ name = strseq (variable, 1:n);
+ else
+ idx = cellfun (@isempty, name);
+ name(idx) = "?";
+ endif
+
+endfunction
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