/usr/share/octave/packages/signal-1.3.2/freqs_plot.m is in octave-signal 1.3.2-1+b1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | ## Copyright (C) 2003 Julius O. Smith III <jos@ccrma.stanford.edu>
##
## This program 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.
##
## This program 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
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} freqs_plot (@var{w}, @var{h})
## Plot the amplitude and phase of the vector @var{h}.
## @end deftypefn
function freqs_plot(w,h)
n = length(w);
mag = 20*log10(abs(h));
phase = unwrap(arg(h));
maxmag = max(mag);
subplot(211);
plot(w, mag, ";Magnitude (dB);");
title('Frequency response plot by freqs');
axis("labely");
ylabel("dB");
xlabel("");
grid("on");
if (maxmag - min(mag) > 100) # make 100 a parameter?
axis([w(1), w(n), maxmag-100, maxmag]);
else
axis("autoy");
endif
subplot(212);
plot(w, phase/(2*pi), ";Phase (radians/2pi);");
axis("label");
title("");
grid("on");
axis("autoy");
xlabel("Frequency (rad/sec)");
ylabel("Cycles");
axis([w(1), w(n)]);
endfunction
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