Mercurial > octave-libgccjit
view scripts/set/union.m @ 8920:eb63fbe60fab
update copyright notices
author | John W. Eaton <jwe@octave.org> |
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date | Sat, 07 Mar 2009 10:41:27 -0500 |
parents | ca032de5fbf2 |
children | 0bcfeadb6178 |
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## Copyright (C) 2008, 2009 Jaroslav Hajek ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2003, 2004, 2005, 2006, ## 2007 John W. Eaton ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} union (@var{a}, @var{b}) ## @deftypefnx{Function File} {} union (@var{a}, @var{b}, "rows") ## Return the set of elements that are in either of the sets @var{a} and ## @var{b}. For example, ## ## @example ## @group ## union ([1, 2, 4], [2, 3, 5]) ## @result{} [1, 2, 3, 4, 5] ## @end group ## @end example ## ## If the optional third input argument is the string "rows" each row of ## the matrices @var{a} and @var{b} will be considered an element of sets. ## For example, ## @example ## @group ## union([1, 2; 2, 3], [1, 2; 3, 4], "rows") ## @result{} 1 2 ## 2 3 ## 3 4 ## @end group ## @end example ## ## @deftypefnx {Function File} {[@var{c}, @var{ia}, @var{ib}] =} union (@var{a}, @var{b}) ## ## Return index vectors @var{ia} and @var{ib} such that @code{a == c(ia)} and ## @code{b == c(ib)}. ## ## @seealso{intersect, complement, unique} ## @end deftypefn ## Author: jwe function [y, ia, ib] = union (a, b, varargin) if (nargin < 2 || nargin > 3) print_usage (); endif if (nargin == 3 && ! strcmpi (varargin{1}, "rows")) error ("union: if a third input argument is present, it must be the string 'rows'"); endif if (nargin == 2) y = [a(:); b(:)]; na = numel (a); nb = numel (b); if (size (a, 1) == 1 || size (b, 1) == 1) y = y.'; endif elseif (ndims (a) == 2 && ndims (b) == 2 && columns (a) == columns (b)) y = [a; b]; na = rows (a); nb = rows (b); else error ("union: input arguments must contain the same number of columns when \"rows\" is specified"); endif if (nargout == 1) y = unique (y, varargin{:}); else [y, i] = unique (y, varargin{:}); ia = i(i <= na); ib = i(i > na) - na; endif endfunction %!assert(all (all (union ([1, 2, 4], [2, 3, 5]) == [1, 2, 3, 4, 5]))); %!assert(all (all (union ([1; 2; 4], [2, 3, 5]) == [1, 2, 3, 4, 5]))); %!assert(all (all (union ([1, 2, 3], [5; 7; 9]) == [1, 2, 3, 5, 7, 9]))); %!error union (1); %!error union (1, 2, 3); %!test %! a = [3, 1, 4, 1, 5]; b = [1, 2, 3, 4]; %! [y, ia, ib] = union (a, b.'); %! assert(y, [1, 2, 3, 4, 5]); %! assert(y, sort([a(ia), b(ib)]));