octave-nkf: scripts/signal/freqz

annotate scripts/signal/freqz_plot.m @ 18450:694e8f0b3862 stable

freqz: Make frequency response plot visually compatible with Matlab (bug #41464) * freqz_plot.m: Eliminate the extraneous "pass band" subplot for visual compatibility with Matlab. Use y-axis labels instead of legends. Always autoscale the y-axis. Label the frequency axis in units of normalized radians or Hz depending on a new optional argument. * freqz.m: Tell freqz_plot whether the frequency vector is in normalized radians or Hz.

author	Mike Miller <mtmiller@ieee.org>
date	Thu, 13 Feb 2014 00:00:10 -0500
parents	d63878346099
children	9d59bc3dc12d

rev	line source
17744 d63878346099 maint: Update copyright notices for release. John W. Eaton <jwe@octave.org> parents: 17338 diff changeset	1 ## Copyright (C) 2002-2013 John W. Eaton
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	2 ##
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	3 ## This file is part of Octave.
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	4 ##
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	5 ## Octave is free software; you can redistribute it and/or modify it
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: 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: 6746 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: 6746 diff changeset	8 ## your option) any later version.
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	9 ##
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	10 ## Octave is distributed in the hope that it will be useful, but
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	13 ## General Public License for more details.
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	14 ##
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: 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: 6746 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: 6746 diff changeset	17 ## <http://www.gnu.org/licenses/>.
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	18
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	19 ## -- texinfo --
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	20 ## @deftypefn {Function File} {} freqz_plot (@var{w}, @var{h})
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	21 ## @deftypefnx {Function File} {} freqz_plot (@var{w}, @var{h}, @var{freq_hz})
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	22 ## Plot the pass band, stop band and phase response of @var{h}. If the
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	23 ## optional @var{freq_norm} argument is true, the frequency vector @var{w}
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	24 ## is in units of normalized radians and the x-axis is labeled as such.
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	25 ## @end deftypefn
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	26
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	27 ## Author: Paul Kienzle <pkienzle@users.sf.net>
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	28
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	29 function freqz_plot (w, h, freq_norm = false)
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	30
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	31 if (nargin < 2 \|\| nargin > 3)
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	32 print_usage ();
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	33 endif
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	34
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	35 n = length (w);
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	36
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	37 ## ## exclude zero-frequency
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	38 ## h = h (2 : length (h));
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	39 ## w = w (2 : length (w));
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	40 ## n = n-1;
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	41
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	42 mag = 20 * log10 (abs (h));
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	43 phase = unwrap (arg (h));
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	44
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	45 if (freq_norm)
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	46 x_label = "Normalized Frequency (\\times\\pi rad/sample)";
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	47 else
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	48 x_label = "Frequency (Hz)";
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	49 endif
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	50
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	51 subplot (2, 1, 1);
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	52 plot (w, mag);
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	53 grid ("on");
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	54 axis ([w(1), w(n)], "autoy");
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	55 xlabel (x_label);
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	56 ylabel ("Magnitude (dB)");
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	57
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	58 subplot (2, 1, 2);
7125 f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	59 plot (w, phase360/(2pi));
f084ba47812b [project @ 2007-11-08 02:29:23 by jwe] jwe parents: 7017 diff changeset	60 grid ("on");
18450 694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	61 axis ([w(1), w(n)], "autoy");
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	62 xlabel (x_label);
694e8f0b3862 freqz: Make frequency response plot visually compatible with Matlab (bug #41464) Mike Miller <mtmiller@ieee.org> parents: 17744 diff changeset	63 ylabel ("Phase (degrees)");
3942 2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	64
2ca2d23a49a7 [project @ 2002-05-16 20:27:59 by jwe] jwe parents: diff changeset	65 endfunction
17338 1c89599167a6 maint: End m-files with 1 blank line. Rik <rik@octave.org> parents: 14138 diff changeset	66

Mercurial > octave-nkf

annotate scripts/signal/freqz_plot.m @ 18450:694e8f0b3862 stable