|
5178
|
1 ## Copyright (C) 2000 Paul Kienzle |
|
|
2 ## |
|
|
3 ## This program is free software; you can redistribute it and/or modify |
|
|
4 ## it under the terms of the GNU General Public License as published by |
|
|
5 ## the Free Software Foundation; either version 2 of the License, or |
|
|
6 ## (at your option) any later version. |
|
|
7 ## |
|
|
8 ## This program is distributed in the hope that it will be useful, |
|
|
9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
|
11 ## GNU General Public License for more details. |
|
|
12 ## |
|
|
13 ## You should have received a copy of the GNU General Public License |
|
|
14 ## along with this program; if not, write to the Free Software |
|
|
15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
|
16 |
|
|
17 ## -*- texinfo -*- |
|
|
18 ## @deftypefn {Function File} {} setdiff(@var{a}, @var{b}) |
|
|
19 ## |
|
|
20 ## Return the elements in @var{a} but not in @var{b}, sorted in ascending |
|
|
21 ## order. If @var{a} and @var{b} are both column vectors return a column |
|
|
22 ## vector, otherwise return a row vector. |
|
|
23 ## |
|
|
24 ## @end deftypefn |
|
|
25 ## @seealso{unique, union, intersect, setxor, ismember} |
|
|
26 |
|
|
27 function c = setdiff(a,b) |
|
|
28 if nargin != 2 |
|
|
29 usage("setdiff(a,b)"); |
|
|
30 endif |
|
|
31 |
|
|
32 c = unique(a); |
|
|
33 if !isempty(c) && !isempty(b) |
|
|
34 ## form a and b into combined set |
|
|
35 b = unique(b); |
|
|
36 [dummy, idx] = sort([ c(:) ; b(:)]); |
|
|
37 ## eliminate those elements of a that are the same as in b |
|
|
38 n = length(dummy); |
|
|
39 c(idx(find(dummy(1:n-1) == dummy(2:n)))) = []; |
|
|
40 ## reshape if necessary |
|
|
41 if ( size(c,1) != 1 && size(b,1) == 1 ) |
|
|
42 c = c.'; |
|
|
43 endif |
|
|
44 endif |
|
|
45 endfunction |
|
|
46 |
