Mercurial > octave-nkf
view scripts/set/setdiff.m @ 5178:6758c11b5b99
[project @ 2005-03-03 05:18:04 by jwe]
author | jwe |
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date | Thu, 03 Mar 2005 05:18:04 +0000 |
parents | |
children | 41cd70503c72 |
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## Copyright (C) 2000 Paul Kienzle ## ## 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 2 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, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## -*- texinfo -*- ## @deftypefn {Function File} {} setdiff(@var{a}, @var{b}) ## ## Return the elements in @var{a} but not in @var{b}, sorted in ascending ## order. If @var{a} and @var{b} are both column vectors return a column ## vector, otherwise return a row vector. ## ## @end deftypefn ## @seealso{unique, union, intersect, setxor, ismember} function c = setdiff(a,b) if nargin != 2 usage("setdiff(a,b)"); endif c = unique(a); if !isempty(c) && !isempty(b) ## form a and b into combined set b = unique(b); [dummy, idx] = sort([ c(:) ; b(:)]); ## eliminate those elements of a that are the same as in b n = length(dummy); c(idx(find(dummy(1:n-1) == dummy(2:n)))) = []; ## reshape if necessary if ( size(c,1) != 1 && size(b,1) == 1 ) c = c.'; endif endif endfunction