/usr/share/octave/packages/interval-1.4.1/@infsupdec/setdiff.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 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | ## 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} setdiff (@var{A}, @var{B})
##
## Build the relative complement of interval @var{B} in interval @var{A}.
##
## Accuracy: The result is a tight enclosure.
##
## @comment DO NOT SYNCHRONIZE DOCUMENTATION STRING
## The function is a set operation and the result carries the @code{trv}
## decoration at best.
##
## @example
## @group
## x = infsupdec (1, 3);
## y = infsupdec (2, 4);
## setdiff (x, y)
## @result{} ans = [1, 2]_trv
## @end group
## @end example
## @seealso{@@infsupdec/intersect, @@infsupdec/union, @@infsupdec/setxor}
## @end defmethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-04-03
function result = setdiff (a, b)
if (nargin ~= 2)
print_usage ();
return
endif
if (not (isa (a, "infsupdec")))
a = infsupdec (a);
endif
if (not (isa (b, "infsupdec")))
b = infsupdec (b);
endif
if (isnai (a))
result = a;
return
endif
if (isnai (b))
result = b;
return
endif
result = infsupdec (setdiff (intervalpart (a), intervalpart (b)), "trv");
endfunction
%!assert (isempty (setdiff (infsupdec (), infsupdec (1, 4))));
%!assert (setdiff (infsupdec (1, 3), infsupdec ()) == infsupdec (1, 3));
%!assert (isempty (setdiff (infsupdec (1, 3), infsupdec (-inf, inf))));
%!assert (isempty (setdiff (infsupdec (1, 3), infsupdec (1, 4))));
%!assert (setdiff (infsupdec (-inf, inf), infsupdec (1, 4)) == infsupdec (-inf, inf));
%!test "from the documentation string";
%! assert (setdiff (infsupdec (1, 3), infsupdec (2, 4)) == infsupdec (1, 2));
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