/usr/share/octave/packages/interval-1.4.1/@infsup/lt.m is in octave-interval 1.4.1-1.
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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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | ## 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
## @defop Method {@@infsup} lt (@var{A}, @var{B})
## @defopx Operator {@@infsup} {@var{A} < @var{B}}
##
## Compare intervals @var{A} and @var{B} for strictly less.
##
## True, if all numbers from @var{A} are strict less than at least one number
## in @var{B}. False, if @var{A} contains a number which is greater than all
## numbers in @var{B} or is equal to the greatest number of @var{B}.
##
## Evaluated on interval matrices, this functions is applied element-wise.
##
## @seealso{@@infsup/eq, @@infsup/le, @@infsup/gt, @@infsup/subset, @@infsup/interior, @@infsup/disjoint}
## @end defop
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2014-10-07
function result = lt (a, b)
if (nargin ~= 2)
print_usage ();
return
endif
if (not (isa (a, "infsup")))
a = infsup (a);
endif
if (not (isa (b, "infsup")))
b = infsup (b);
elseif (isa (b, "infsupdec"))
## Workaround for bug #42735
result = lt (a, b);
return
endif
result = ((a.inf < b.inf | (a.inf == -inf & b.inf == -inf)) & ...
(a.sup < b.sup | (a.sup == inf & b.sup == inf)));
result (isempty (a) & isempty (b)) = true ();
endfunction
%!assert (not (lt (infsup (1, 3), infsup (3))));
%!assert (lt (infsup (1, 3), infsup (3.1)));
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