Mercurial > octave
view scripts/signal/freqz_plot.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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## Copyright (C) 2002-2020 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this distribution ## or <https://octave.org/COPYRIGHT.html/>. ## ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {} {} freqz_plot (@var{w}, @var{h}) ## @deftypefnx {} {} freqz_plot (@var{w}, @var{h}, @var{freq_norm}) ## Plot the magnitude and phase response of @var{h}. ## ## If the optional @var{freq_norm} argument is true, the frequency vector ## @var{w} is in units of normalized radians. If @var{freq_norm} is false, or ## not given, then @var{w} is measured in Hertz. ## @seealso{freqz} ## @end deftypefn ## Author: Paul Kienzle <pkienzle@users.sf.net> function freqz_plot (w, h, freq_norm = false) if (nargin < 2 || nargin > 3) print_usage (); endif n = length (w); ## ## exclude zero-frequency ## h = h (2 : length (h)); ## w = w (2 : length (w)); ## n = n-1; mag = 20 * log10 (abs (h)); phase = unwrap (arg (h)); if (freq_norm) x_label = 'Normalized Frequency (\times\pi rad/sample)'; else x_label = "Frequency (Hz)"; endif subplot (2, 1, 1); plot (w, mag); grid ("on"); axis ([w(1), w(n)], "autoy"); xlabel (x_label); ylabel ("Magnitude (dB)"); subplot (2, 1, 2); plot (w, phase*360/(2*pi)); grid ("on"); axis ([w(1), w(n)], "autoy"); xlabel (x_label); ylabel ("Phase (degrees)"); endfunction