1 ## Copyright (C) 2000 Paul Kienzle <pkienzle@users.sf.net>
3 ## This program is free software; you can redistribute it and/or modify it under
4 ## the terms of the GNU General Public License as published by the Free Software
5 ## Foundation; either version 3 of the License, or (at your option) any later
8 ## This program is distributed in the hope that it will be useful, but WITHOUT
9 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
13 ## You should have received a copy of the GNU General Public License along with
14 ## this program; if not, see <http://www.gnu.org/licenses/>.
16 ## usage: y = rectpuls(t, w)
18 ## Generate a rectangular pulse over the interval [-w/2,w/2), sampled at
19 ## times t. This is useful with the function pulstran for generating a
23 ## fs = 11025; # arbitrary sample rate
24 ## f0 = 100; # pulse train sample rate
25 ## w = 0.3/f0; # pulse width 3/10th the distance between pulses
26 ## auplot(pulstran(0:1/fs:4/f0, 0:1/f0:4/f0, 'rectpuls', w), fs);
30 function y = rectpuls(t, w = 1)
32 if nargin<1 || nargin>2,
37 idx = find(t>=-w/2 & t < w/2);
38 try wfi = warning("off", "Octave:fortran-indexing");
42 y(idx) = ones(size(idx));
43 unwind_protect_cleanup
48 %!assert(rectpuls(0:1/100:0.3,.1), rectpuls([0:1/100:0.3]',.1)');
49 %!assert(isempty(rectpuls([],.1)));
51 %! fs = 11025; # arbitrary sample rate
52 %! f0 = 100; # pulse train sample rate
53 %! w = 0.3/f0; # pulse width 1/10th the distance between pulses
54 %! ylabel("amplitude"); xlabel("time (ms)");
55 %! title("graph shows 3 ms pulses at 0,10,20,30 and 40 ms");
56 %! auplot(pulstran(0:1/fs:4/f0, 0:1/f0:4/f0, 'rectpuls', w), fs);
57 %! title(""); xlabel(""); ylabel("");