X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fsignal-1.1.3%2Ffreqs_plot.m;fp=octave_packages%2Fsignal-1.1.3%2Ffreqs_plot.m;h=db54a49a8dfdf2a3267372e8f8738b86f85f9958;hp=0000000000000000000000000000000000000000;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/signal-1.1.3/freqs_plot.m b/octave_packages/signal-1.1.3/freqs_plot.m
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+++ b/octave_packages/signal-1.1.3/freqs_plot.m
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+## 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