/usr/share/octave/packages/interval-2.1.0/@infsupdec/isnai.m is in octave-interval 2.1.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ## Copyright 2014-2016 Oliver Heimlich
##
## This program 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.
##
## This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @documentencoding UTF-8
## @defmethod {@@infsupdec} isnai (@var{X})
##
## Check if the interval is the result of a failed interval construction.
##
## @seealso{@@infsupdec/eq, @@infsupdec/isentire, @@infsupdec/issingleton, @@infsupdec/isempty}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2014-10-13
function result = isnai (interval)
if (nargin ~= 1)
print_usage ();
return
endif
## NaI is internally stored as an empty interval with ill decoration.
result = (interval.dec == _ill ());
endfunction
%!assert (isnai (infsupdec ("[nai]")));
%!assert (not (isnai (infsupdec (2, 3))));
%!warning assert (isnai (infsupdec ("happy 42 hacking")), logical ([1 0 1]));
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