/usr/share/doc/libplplot12/examples/perl/x17.pl is in libplplot-dev 5.10.0+dfsg-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | #! /usr/bin/env perl
#
# Demo x17 for the PLplot PDL binding
#
# Plots a simple stripchart with four pens
#
# Copyright (C) 2004 Rafael Laboissiere
#
# This file is part of PLplot.
#
# PLplot is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published
# by the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PLplot 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with PLplot; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# SYNC: x17c.c 1.16
use PDL;
use PDL::Graphics::PLplot;
use Math::Trig qw [pi];
use Time::HiRes qw [usleep];
my $nsteps = 1000;
# Parse and process command line arguments
plParseOpts (\@ARGV, PL_PARSE_SKIP | PL_PARSE_NOPROGRAM);
# 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", "");
# User sets up plot completely except for window and data
# Eventually settings in place when strip chart is created will be
# remembered so that multiple strip charts can be used simultaneously.
# Specify some reasonable defaults for ymin and ymax
# The plot will grow automatically if needed (but not shrink)
my $ymin = -0.1;
my $ymax = 0.1;
# Specify initial tmin and tmax -- this determines length of window.
# Also specify maximum jump in t
# This can accomodate adaptive timesteps
my $tmin = 0.;
my $tmax = 10.;
my $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
my $colbox = 1;
my $collab = 3;
# pens color and line style
my $styline = sequence (4) + 2;
my $colline = $styline;
# pens legend
my @legline = ("sum", "sin","sin*noi", "sin+noi");
# legend position
my $xlab = 0.;
my $ylab = 0.25;
my $autoy = 1; # autoscale y
my $acc = 1; # don't scrip, accumulate
# Initialize plplot
plinit ();
pladv (0);
plvsta ();
# Register our error variables with PLplot
# From here on, we're handling all errors here
# N.B : plsError is not implement in the PErlDL binding
# plsError (&pl_errcode, errmsg);
my $id1 = plstripc ($tmin, $tmax, $tjump, $ymin, $ymax,
$xlab, $ylab,
$autoy, $acc,
$colbox, $collab,
$colline, $styline,
"bcnst", "bcnstv", \@legline,
"t", "", "Strip chart demo");
# N.B : plsError is not implement in the PErlDL binding
# if (pl_errcode) {
# fprintf(stderr, "%s\n", errmsg);
# exit(1);
# }
# N.B : plsError is not implement in the PerlDL binding
# Let plplot handle errors from here on
# plsError(NULL, NULL);
$autoy = 0; # autoscale y
$acc = 1; # accumulate
# This is to represent a loop over time
# Let's try a random walk process
my $y1 = my $y2 = my $y3 = my $y4 = 0.0;
my $dt = 0.1;
for (my $n = 0; $n < $nsteps; $n++) {
usleep (10000); # wait a little (10 ms) to simulate time elapsing
my $t = $n * $dt;
$noise = plrandd () - 0.5;
$y1 = $y1 + $noise;
$y2 = sin ($t * pi / 18);
$y3 = $y2 * $noise;
$y4 = $y2 + $noise / 3;
# There is no need for all pens to have the same number of
# points or beeing equally time spaced.
if ($n % 2) {
plstripa ($id1, 0, $t, $y1);
}
if ($n % 3) {
plstripa ($id1, 1, $t, $y2);
}
if ($n % 4) {
plstripa ($id1, 2, $t, $y3);
}
if ($n % 5) {
plstripa ($id1, 3, $t, $y4);
}
# pleop (); # use double buffer (-db on command line)
}
# Destroy strip chart and it's memory
plstripd ($id1);
plend ();
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