/usr/share/doc/libplplot11/examples/octave/x17c.m is in octave-plplot 5.9.9-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | ## Copyright (C) 1998, 1999, 2000 Joao Cardoso
## Copyright (C) 2004 Rafael Laboissiere
##
## 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 2 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.
##
## This file is part of plplot_octave.
## It is based on the corresponding demo function of PLplot.
function x17c
nsteps = 1000;
## If db is used the plot is much more smooth. However, because of the
## async X behaviour, one does not have a real-time scripcharter.
## plSetOpt("db", "");
## plSetOpt("np", "");
## Specify some reasonable defaults for ymin and ymax */
## The plot will grow automatically if needed (but not shrink) */
ymin = -0.1;
ymax = 0.1;
## Specify initial tmin and tmax -- this determines length of window. */
## Also specify maximum jump in t */
## This can accomodate adaptive timesteps */
tmin = 0.;
tmax = 10.;
tjump = 0.3; ## percentage of plot to jump
## Axes options same as plbox. */
## Only automatic tick generation and label placement allowed */
## Eventually I'll make this fancier */
colbox = 1;
collab = 3;
styline(1) = colline(1) = 2; ## pens color and line style
styline(2) = colline(2) = 3;
styline(3) = colline(3) = 4;
styline(4) = colline(4) = 5;
## legline = ["sum"; "sin"; "sin*noi"; "sin+noi";];
xlab = 0.; ylab = 0.25; ## legend position
autoy = 1; ## autoscale y
acc = 1; ## dont strip, accumulate
## Initialize plplot */
plinit();
pladv(0);
plvsta();
id1= plstripc("bcnst", "bcnstv",
tmin, tmax, tjump, ymin, ymax,
xlab, ylab,
autoy, acc,
colbox, collab,
colline', styline', "sum", "sin", "sin*noi", "sin+noi",
"t", "", "Strip chart demo");
autoy = 0;
acc = 1;
## This is to represent a loop over time */
## Let's try a random walk process */
y1 = y2 = y3 = y4 = 0.0;
dt = 0.1;
for n = 0:nsteps-1
t = n * dt;
noise = plrandd()-0.5;
y1 = y1 + noise;
y2 = sin(t*pi/18.);
y3 = y2 * noise;
y4 = y2 + noise/3.;
## there is no need for all pens to have the same number of points
## or beeing equally time spaced.
if (rem(n,2))
plstripa(id1, 0, t, y1);
endif
if rem(n,3)
plstripa(id1, 1, t, y2);
endif
if rem(n,4)
plstripa(id1, 2, t, y3);
endif
if rem(n,5)
plstripa(id1, 3, t, y4);
endif
endfor
## Destroy strip chart and it's memory */
plstripd(id1);
plend1();
endfunction
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