Mercurial > hg > octave-nkf

annotate scripts/signal/sinc.m @ 13818:a05e5db7b94e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
have some fun with waitbar demo #2
author John W. Eaton <jwe@octave.org>
date Fri, 04 Nov 2011 14:33:44 -0400
parents cd59f5271941
children 72c96de7a403
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11523
fd0a3ac60b0e update copyright notices
John W. Eaton <jwe@octave.org>
parents: 9211
diff changeset
1 ## Copyright (C) 1994-2011 John W. Eaton
2313
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
2 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
3 ## This file is part of Octave.
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
4 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
5 ## Octave is free software; you can redistribute it and/or modify it
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
6 ## under the terms of the GNU General Public License as published by
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5307
diff changeset
7 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5307
diff changeset
8 ## your option) any later version.
2313
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
9 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
10 ## Octave is distributed in the hope that it will be useful, but
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
13 ## General Public License for more details.
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
14 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2311
diff changeset
15 ## You should have received a copy of the GNU General Public License
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5307
diff changeset
16 ## along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 5307
diff changeset
17 ## <http://www.gnu.org/licenses/>.
2303
5cffc4b8de57 [project @ 1996-06-24 09:15:24 by jwe]
jwe
parents: 904
diff changeset
18
3367
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
19 ## -*- texinfo -*-
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
20 ## @deftypefn {Function File} {} sinc (@var{x})
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
21 ## Return
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
22 ## @tex
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
23 ## $ \sin (\pi x)/(\pi x)$.
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
24 ## @end tex
8517
81d6ab3ac93c Allow documentation tobe built for other formats than tex and info
sh@sh-laptop
parents: 7125
diff changeset
25 ## @ifnottex
3367
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
26 ## sin(pi*x)/(pi*x).
8517
81d6ab3ac93c Allow documentation tobe built for other formats than tex and info
sh@sh-laptop
parents: 7125
diff changeset
27 ## @end ifnottex
3367
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
28 ## @end deftypefn
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
29
3367
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe]
jwe
parents: 2847
diff changeset
30 ## Author: jwe ???
2314
949ab8eba8bc [project @ 1996-07-12 03:58:02 by jwe]
jwe
parents: 2313
diff changeset
31
2311
2b5788792cad [project @ 1996-07-11 20:18:38 by jwe]
jwe
parents: 2303
diff changeset
32 function result = sinc (x)
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
33
7125
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
34 if (nargin != 1)
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
35 print_usage ();
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
36 endif
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe]
jwe
parents: 7017
diff changeset
37
3486
9493fe321888 [project @ 2000-01-28 05:05:41 by jwe]
jwe
parents: 3367
diff changeset
38 result = ones (size (x));
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
39
3486
9493fe321888 [project @ 2000-01-28 05:05:41 by jwe]
jwe
parents: 3367
diff changeset
40 i = (x != 0);
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
41
4807
15e923b54eff [project @ 2004-03-02 14:21:02 by jwe]
jwe
parents: 3486
diff changeset
42 if (any (i(:)))
3486
9493fe321888 [project @ 2000-01-28 05:05:41 by jwe]
jwe
parents: 3367
diff changeset
43 t = pi * x(i);
9493fe321888 [project @ 2000-01-28 05:05:41 by jwe]
jwe
parents: 3367
diff changeset
44 result(i) = sin (t) ./ t;
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
45 endif
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
46
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
jwe
parents:
diff changeset
47 endfunction
12816
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
48
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
49
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
50 %!assert (sinc (0), 1);
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
51 %!assert (sinc (1), 0,1e-6);
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
52 %!assert (sinc (1/2), 2/pi, 1e-6)
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
53
cd59f5271941 codesprint: Wrote 4 tests for sinc.m
Giles Anderson <agander@gmail.com>
parents: 11523
diff changeset
54 %!error sinc()