/usr/share/octave/packages/interval-2.1.0/@infsupdec/prod.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 62 63 | ## Copyright 2015-2016 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} prod (@var{X})
## @defmethodx {@@infsupdec} prod (@var{X}, @var{DIM})
##
## Product of elements along dimension @var{DIM}. If @var{DIM} is omitted, it
## defaults to the first non-singleton dimension.
##
## Accuracy: The result is a valid enclosure.
##
## @example
## @group
## prod (infsupdec (1 : 4))
## @result{} ans = [24]_com
## @end group
## @end example
## @seealso{@@infsupdec/sum}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-10-24
function result = prod (x, dim)
if (nargin > 2)
print_usage ();
return
endif
if (nargin < 2)
## Try to find non-singleton dimension
dim = find (size (x.dec) > 1, 1);
if (isempty (dim))
dim = 1;
endif
endif
result = newdec (prod (x.infsup, dim));
if (not (isempty (x.dec)))
warning ("off", "Octave:broadcast", "local");
result.dec = min (result.dec, min (x.dec, [], dim));
endif
endfunction
%!# from the documentation string
%!assert (prod (infsupdec (1 : 4)) == 24);
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