octave-lyh: scripts/signal/freqz.m annotate

annotate scripts/signal/freqz.m @ 16207:0467d68ca891

move current_input_line to lexical_feedback class * input.h, input.cc, lex.h, lex.ll (current_input_line): Declare as member of lexical_feedback class. (octave_base_reader::octave_gets, octave_terminal_reader::get_input, octave_file_reader::get_input, octave_eval_string_reader::get_input): Don't set current_input_line. (octave_lexer::read): Set current_input_line. * oct-parse.in.yy (octave_parser::bison_error): Use curr_lexer->current_input_line.

author	John W. Eaton <jwe@octave.org>
date	Wed, 06 Mar 2013 19:39:48 -0500
parents	f3d52523cde1
children	36dba9be680b

rev	line source
14138 72c96de7a403 maint: update copyright notices for 2012 John W. Eaton <jwe@octave.org> parents: 11587 diff changeset	1 ## Copyright (C) 1994-2012 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: 6653 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: 6653 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: 6653 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: 6653 diff changeset	17 ## <http://www.gnu.org/licenses/>.
2303 5cffc4b8de57 [project @ 1996-06-24 09:15:24 by jwe] jwe parents: 1337 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} {[@var{h}, @var{w}] =} freqz (@var{b}, @var{a}, @var{n}, "whole")
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	21 ## Return the complex frequency response @var{h} of the rational IIR filter
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	22 ## whose numerator and denominator coefficients are @var{b} and @var{a},
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	23 ## respectively. The response is evaluated at @var{n} angular frequencies
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	24 ## between 0 and
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 8506 diff changeset	25 ## @ifnottex
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	26 ## 2*pi.
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 8506 diff changeset	27 ## @end ifnottex
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	28 ## @tex
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	29 ## $2\pi$.
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	30 ## @end tex
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3367 diff changeset	31 ##
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	32 ## @noindent
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	33 ## The output value @var{w} is a vector of the frequencies.
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3367 diff changeset	34 ##
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	35 ## If the fourth argument is omitted, the response is evaluated at
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	36 ## frequencies between 0 and
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 8506 diff changeset	37 ## @ifnottex
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	38 ## pi.
8517 81d6ab3ac93c Allow documentation tobe built for other formats than tex and info sh@sh-laptop parents: 8506 diff changeset	39 ## @end ifnottex
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	40 ## @tex
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	41 ## $\pi$.
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	42 ## @end tex
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3367 diff changeset	43 ##
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	44 ## If @var{n} is omitted, a value of 512 is assumed.
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3367 diff changeset	45 ##
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	46 ## If @var{a} is omitted, the denominator is assumed to be 1 (this
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	47 ## corresponds to a simple FIR filter).
3426 f8dde1807dee [project @ 2000-01-13 08:40:00 by jwe] jwe parents: 3367 diff changeset	48 ##
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	49 ## For fastest computation, @var{n} should factor into a small number of
0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	50 ## small primes.
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	51 ##
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	52 ## @deftypefnx {Function File} {@var{h} =} freqz (@var{b}, @var{a}, @var{w})
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	53 ## Evaluate the response at the specific frequencies in the vector @var{w}.
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	54 ## The values for @var{w} are measured in radians.
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	55 ##
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	56 ## @deftypefnx {Function File} {[@dots{}] =} freqz (@dots{}, @var{Fs})
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	57 ## Return frequencies in Hz instead of radians assuming a sampling rate
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	58 ## @var{Fs}. If you are evaluating the response at specific frequencies
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	59 ## @var{w}, those frequencies should be requested in Hz rather than radians.
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	60 ##
3920 87db95b22f8f [project @ 2002-05-01 04:07:31 by jwe] jwe parents: 3909 diff changeset	61 ## @deftypefnx {Function File} {} freqz (@dots{})
3907 437884fae441 [project @ 2002-04-24 19:33:08 by jwe] jwe parents: 3893 diff changeset	62 ## Plot the pass band, stop band and phase response of @var{h} rather
437884fae441 [project @ 2002-04-24 19:33:08 by jwe] jwe parents: 3893 diff changeset	63 ## than returning them.
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	64 ## @end deftypefn
904 3470f1e25a79 [project @ 1994-11-09 21:22:15 by jwe] jwe parents: 566 diff changeset	65
3367 0748b03c3510 [project @ 1999-11-20 14:52:38 by jwe] jwe parents: 2847 diff changeset	66 ## Author: jwe ???
2314 949ab8eba8bc [project @ 1996-07-12 03:58:02 by jwe] jwe parents: 2313 diff changeset	67
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	68 function [h_r, f_r] = freqz (b, a, n, region, Fs)
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	69
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	70 if (nargin < 1 \|\| nargin > 5)
6046 34f96dd5441b [project @ 2006-10-10 16:10:25 by jwe] jwe parents: 5986 diff changeset	71 print_usage ();
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	72 elseif (nargin == 1)
2303 5cffc4b8de57 [project @ 1996-06-24 09:15:24 by jwe] jwe parents: 1337 diff changeset	73 ## Response of an FIR filter.
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	74 a = n = region = Fs = [];
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	75 elseif (nargin == 2)
2303 5cffc4b8de57 [project @ 1996-06-24 09:15:24 by jwe] jwe parents: 1337 diff changeset	76 ## Response of an IIR filter
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	77 n = region = Fs = [];
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	78 elseif (nargin == 3)
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	79 region = Fs = [];
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	80 elseif (nargin == 4)
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	81 Fs = [];
5443 ec8c33dcd1bf [project @ 2005-09-08 01:40:57 by jwe] jwe parents: 5378 diff changeset	82 if (! ischar (region) && ! isempty (region))
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	83 Fs = region;
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	84 region = [];
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	85 endif
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	86 endif
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	87
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	88 if (isempty (b))
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	89 b = 1;
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	90 endif
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	91 if (isempty (a))
c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	92 a = 1;
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	93 endif
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	94 if (isempty (n))
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	95 n = 512;
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	96 endif
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	97 if (isempty (region))
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	98 if (isreal (b) && isreal (a))
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	99 region = "half";
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	100 else
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	101 region = "whole";
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	102 endif
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	103 endif
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	104 if (isempty (Fs))
c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	105 if (nargout == 0)
c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	106 Fs = 2;
c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	107 else
c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	108 Fs = 2*pi;
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	109 endif
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	110 endif
8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	111
5583 8eebdcfde94e [project @ 2005-12-15 01:16:26 by jwe] jwe parents: 5443 diff changeset	112 a = a(:);
8eebdcfde94e [project @ 2005-12-15 01:16:26 by jwe] jwe parents: 5443 diff changeset	113 b = b(:);
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	114
8506 bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	115 if (! isscalar (n))
bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	116 ## Explicit frequency vector given
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	117 w = f = n;
8506 bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	118 if (nargin == 4)
bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	119 ## Sampling rate Fs was specified
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	120 w = 2pif/Fs;
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	121 endif
5986 14078139f941 [project @ 2006-09-12 02:46:33 by jwe] jwe parents: 5583 diff changeset	122 k = max (length (b), length (a));
14078139f941 [project @ 2006-09-12 02:46:33 by jwe] jwe parents: 5583 diff changeset	123 hb = polyval (postpad (b, k), exp (j*w));
14078139f941 [project @ 2006-09-12 02:46:33 by jwe] jwe parents: 5583 diff changeset	124 ha = polyval (postpad (a, k), exp (j*w));
8667 a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	125 else
5583 8eebdcfde94e [project @ 2005-12-15 01:16:26 by jwe] jwe parents: 5443 diff changeset	126 ## polyval(fliplr(P),exp(jw)) is O(p n) and fft(x) is O(n log(n)),
6653 673686daec87 [project @ 2007-05-22 15:36:09 by jwe] jwe parents: 6046 diff changeset	127 ## where p is the order of the polynomial P. For small p it
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	128 ## would be faster to use polyval but in practice the overhead for
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	129 ## polyval is much higher and the little bit of time saved isn't
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	130 ## worth the extra code.
8667 a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	131 k = max (length (b), length (a));
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	132 if (k > n/2 && nargout == 0)
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	133 ## Ensure a causal phase response.
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	134 n = n * 2 .^ ceil (log2 (2*k/n));
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	135 endif
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	136
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	137 if (strcmp (region, "whole"))
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	138 N = n;
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	139 else
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	140 N = 2*n;
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	141 endif
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	142
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	143 f = Fs * (0:n-1).' / N;
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	144
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	145 pad_sz = N*ceil (k/N);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	146 b = postpad (b, pad_sz);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	147 a = postpad (a, pad_sz);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	148
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	149 hb = zeros (n, 1);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	150 ha = zeros (n, 1);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	151
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	152 for i = 1:N:pad_sz
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	153 hb = hb + fft (postpad (b(i:i+N-1), N))(1:n);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	154 ha = ha + fft (postpad (a(i:i+N-1), N))(1:n);
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	155 endfor
a89198168175 freqz.m: freqz.m: fix for long input Ben Abbott <bpabbott@mac.com> parents: 8517 diff changeset	156
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	157 endif
8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	158
3893 abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	159 h = hb ./ ha;
abd8659eea11 [project @ 2002-04-09 21:36:31 by jwe] jwe parents: 3457 diff changeset	160
8506 bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	161 if (nargout != 0)
bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	162 ## Return values and don't plot.
3907 437884fae441 [project @ 2002-04-24 19:33:08 by jwe] jwe parents: 3893 diff changeset	163 h_r = h;
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	164 f_r = f;
8506 bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	165 else
bc982528de11 comment style fixes John W. Eaton <jwe@octave.org> parents: 7151 diff changeset	166 ## Plot and don't return values.
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	167 freqz_plot (f, h);
7151 aeeb646f6538 [project @ 2007-11-09 19:34:17 by jwe] jwe parents: 7017 diff changeset	168 endif
3907 437884fae441 [project @ 2002-04-24 19:33:08 by jwe] jwe parents: 3893 diff changeset	169
566 8529a21443fa [project @ 1994-07-26 02:07:38 by jwe] jwe parents: diff changeset	170 endfunction
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	171
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	172
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	173 %!test # correct values and fft-polyval consistency
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	174 %! # butterworth filter, order 2, cutoff pi/2 radians
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	175 %! b = [0.292893218813452 0.585786437626905 0.292893218813452];
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	176 %! a = [1 0 0.171572875253810];
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	177 %! [h,w] = freqz (b,a,32);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	178 %! assert (h(1),1,10*eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	179 %! assert (abs (h(17)).^2,0.5,10*eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	180 %! assert (h,freqz (b,a,w),10*eps); # fft should be consistent with polyval
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	181
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	182 %!test # whole-half consistency
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	183 %! b = [1 1 1]/3; # 3-sample average
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	184 %! [h,w] = freqz (b,1,32,"whole");
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	185 %! assert (h(2:16),conj (h(32:-1:18)),20*eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	186 %! [h2,w2] = freqz (b,1,16,"half");
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	187 %! assert (h(1:16),h2,20*eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	188 %! assert (w(1:16),w2,20*eps);
5377 bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	189
bd4ee620c38a [project @ 2005-06-02 15:42:39 by jwe] jwe parents: 5307 diff changeset	190 %!test # Sampling frequency properly interpreted
5986 14078139f941 [project @ 2006-09-12 02:46:33 by jwe] jwe parents: 5583 diff changeset	191 %! b = [1 1 1]/3; a = [1 0.2];
14363 f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	192 %! [h,f] = freqz (b,a,16,320);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	193 %! assert (f,[0:15]'10,10eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	194 %! [h2,f2] = freqz (b,a,[0:15]*10,320);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	195 %! assert (f2,[0:15]10,10eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	196 %! assert (h,h2.',20*eps);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	197 %! [h3,f3] = freqz (b,a,32,"whole",320);
f3d52523cde1 Use Octave coding conventions in all m-file %!test blocks Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	198 %! assert (f3,[0:31]'10,10eps);

Mercurial > hg > octave-lyh

annotate scripts/signal/freqz.m @ 16207:0467d68ca891