/usr/share/octave/packages/interval-2.1.0/@infsupdec/plus.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 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 {@@infsupdec} plus (@var{X}, @var{Y})
## @defopx Operator {@@infsupdec} {@var{X} + @var{Y}}
##
## Add all numbers of interval @var{X} to all numbers of @var{Y}.
##
## Accuracy: The result is a tight enclosure.
##
## @example
## @group
## x = infsupdec (2, 3);
## y = infsupdec (1, 2);
## x + y
## @result{} ans = [3, 5]_com
## @end group
## @end example
## @seealso{@@infsupdec/minus}
## @end defop
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2014-10-13
function result = plus (x, y)
if (nargin ~= 2)
print_usage ();
return
endif
if (not (isa (x, "infsupdec")))
x = infsupdec (x);
endif
if (not (isa (y, "infsupdec")))
y = infsupdec (y);
endif
result = newdec (plus (x.infsup, y.infsup));
## plus is continuous and defined everywhere
result.dec = min (result.dec, min (x.dec, y.dec));
endfunction
%!# from the documentation string
%!assert (isequal (infsupdec (2, 3) + infsupdec (1, 2), infsupdec (3, 5)));
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