Mercurial > hg > octave-nkf

annotate scripts/polynomial/polyreduce.m @ 5307:4c8a2e4e0717

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
[project @ 2005-04-26 19:24:27 by jwe]
author jwe
date Tue, 26 Apr 2005 19:24:47 +0000
parents c08cb1098afc
children 2618a0750ae6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2847
8b262e771614 [project @ 1997-03-27 16:18:26 by jwe]
jwe
parents: 2716
diff changeset
1 ## Copyright (C) 1996, 1997 John W. Eaton
2313
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
2 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
3 ## This file is part of Octave.
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
4 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
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: 2312
diff changeset
6 ## under the terms of the GNU General Public License as published by
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
7 ## the Free Software Foundation; either version 2, or (at your option)
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
8 ## any later version.
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
9 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
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: 2312
diff changeset
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
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: 2312
diff changeset
13 ## General Public License for more details.
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
14 ##
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
15 ## You should have received a copy of the GNU General Public License
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
parents: 2312
diff changeset
16 ## along with Octave; see the file COPYING. If not, write to the Free
5307
4c8a2e4e0717 [project @ 2005-04-26 19:24:27 by jwe]
jwe
parents: 5053
diff changeset
17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
4c8a2e4e0717 [project @ 2005-04-26 19:24:27 by jwe]
jwe
parents: 5053
diff changeset
18 ## 02110-1301, USA.
904
3470f1e25a79 [project @ 1994-11-09 21:22:15 by jwe]
jwe
parents: 561
diff changeset
19
3368
a4cd1e9d9962 [project @ 1999-11-20 17:22:48 by jwe]
jwe
parents: 3202
diff changeset
20 ## -*- texinfo -*-
a4cd1e9d9962 [project @ 1999-11-20 17:22:48 by jwe]
jwe
parents: 3202
diff changeset
21 ## @deftypefn {Function File} {} polyreduce (@var{c})
a4cd1e9d9962 [project @ 1999-11-20 17:22:48 by jwe]
jwe
parents: 3202
diff changeset
22 ## Reduces a polynomial coefficient vector to a minimum number of terms by
a4cd1e9d9962 [project @ 1999-11-20 17:22:48 by jwe]
jwe
parents: 3202
diff changeset
23 ## stripping off any leading zeros.
a4cd1e9d9962 [project @ 1999-11-20 17:22:48 by jwe]
jwe
parents: 3202
diff changeset
24 ## @end deftypefn
5053
c08cb1098afc [project @ 2004-10-19 23:10:54 by jwe]
jwe
parents: 4030
diff changeset
25 ##
3457
e031284eea27 [project @ 2000-01-19 08:49:56 by jwe]
jwe
parents: 3426
diff changeset
26 ## @seealso{poly, roots, conv, deconv, residue, filter, polyval,
e031284eea27 [project @ 2000-01-19 08:49:56 by jwe]
jwe
parents: 3426
diff changeset
27 ## polyvalm, polyderiv, and polyinteg}
1025
f558749713f1 [project @ 1995-01-11 20:52:10 by jwe]
jwe
parents: 904
diff changeset
28
3202
44d82b369c78 [project @ 1998-10-29 20:27:57 by jwe]
jwe
parents: 2847
diff changeset
29 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
2312
204cc7db6f4a [project @ 1996-07-11 21:20:36 by jwe]
jwe
parents: 2311
diff changeset
30 ## Created: June 1994
204cc7db6f4a [project @ 1996-07-11 21:20:36 by jwe]
jwe
parents: 2311
diff changeset
31 ## Adapted-By: jwe
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
32
2312
204cc7db6f4a [project @ 1996-07-11 21:20:36 by jwe]
jwe
parents: 2311
diff changeset
33 function p = polyreduce (p)
1025
f558749713f1 [project @ 1995-01-11 20:52:10 by jwe]
jwe
parents: 904
diff changeset
34
2716
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
35 if (nargin != 1)
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
36 usage ("polyreduce (p)");
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
37 endif
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
38
4030
22bd65326ec1 [project @ 2002-08-09 18:58:13 by jwe]
jwe
parents: 3617
diff changeset
39 if (! (isvector (p) || isempty (p)))
2716
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
40 error ("polyreduce: argument must be a vector");
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
41 endif
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
42
3617
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
43 if (! isempty (p) )
1178
bceff7ccdb79 [project @ 1995-03-23 21:42:24 by jwe]
jwe
parents: 1025
diff changeset
44
3617
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
45 index = find (p != 0);
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
46
3617
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
47 if (isempty (index))
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
48
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
49 p = 0;
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
50
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
51 else
2716
2b5c27299cde [project @ 1997-02-22 08:40:55 by jwe]
jwe
parents: 2313
diff changeset
52
3617
b0d6c6e84d56 [project @ 2000-03-21 10:51:38 by jwe]
jwe
parents: 3457
diff changeset
53 p = p (index (1):length (p));
1178
bceff7ccdb79 [project @ 1995-03-23 21:42:24 by jwe]
jwe
parents: 1025
diff changeset
54
bceff7ccdb79 [project @ 1995-03-23 21:42:24 by jwe]
jwe
parents: 1025
diff changeset
55 endif
bceff7ccdb79 [project @ 1995-03-23 21:42:24 by jwe]
jwe
parents: 1025
diff changeset
56
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
57 endif
1025
f558749713f1 [project @ 1995-01-11 20:52:10 by jwe]
jwe
parents: 904
diff changeset
58
561
e79ff1f4df3c [project @ 1994-07-25 22:32:08 by jwe]
jwe
parents:
diff changeset
59 endfunction