/usr/share/doc/libplplot12/examples/perl/x29.pl is in libplplot-dev 5.10.0+dfsg-1.
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# Sample plots using date / time formatting for axes
#
# Copyright (C) 2007 Andrew Ross
# Perl/PDL version 2008 Doug Hunt
#
# 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
#--------------------------------------------------------------------------
# main
#
# Draws several plots which demonstrate the use of date / time formats for
# the axis labels.
# Time formatting is done using the system strftime routine. See the
# documentation of this for full details of the available formats.
#
# 1) Plotting temperature over a day (using hours / minutes)
# 2) Plotting
#
# Note: Times are stored as seconds since the epoch (usually 1st Jan 1970).
#
#--------------------------------------------------------------------------
use PDL;
use PDL::Graphics::PLplot;
use Time::Local;
use List::Util;
use constant PI => 4*atan2(1,1);
# Parse command line arguments
plParseOpts (\@ARGV, PL_PARSE_SKIP | PL_PARSE_NOPROGRAM);
# Initialize plplot
plinit();
# Change the escape character to a '@' instead of the default '#'
plsesc('@');
plot1();
plot2();
plot3();
plot4();
# Don't forget to call plend() to finish off!
plend();
exit(0);
# Plot a model diurnal cycle of temperature
sub plot1 {
# Data points every 10 minutes for 1 day
my $npts = 73;
my $xmin = 0;
my $xmax = 60.0*60.0*24.0; # Number of seconds in a day
my $ymin = 10.0;
my $ymax = 20.0;
my $x = $xmax * sequence($npts)/$npts;
my $y = 15.0 - 5.0*cos(2*PI*sequence($npts)/$npts);
my $xerr1 = $x-60.0*5.0;
my $xerr2 = $x+60.0*5.0;
my $yerr1 = $y-0.1;
my $yerr2 = $y+0.1;
pladv(0);
plsmaj(0.0,0.5);
plsmin(0.0,0.5);
plvsta();
plwind($xmin, $xmax, $ymin, $ymax);
# Draw a box with ticks spaced every 3 hour in X and 1 degree C in Y.
plcol0(1);
# Set time format to be hours:minutes
pltimefmt("%H:%M");
plbox(3.0*60*60, 3, 1, 5, "bcnstd", "bcnstv");
plcol0(3);
pllab("Time (hours:mins)", "Temperature (degC)", '@frPLplot Example 29 - Daily temperature');
plcol0(4);
plline($x, $y);
plcol0(2);
plerrx($npts, $xerr1,$xerr2,$y);
plcol0(3);
plerry($npts, $x,$yerr1,$yerr2);
plsmin(0.0,1.0);
plsmaj(0.0,1.0);
}
# Plot the number of hours of daylight as a function of day for a year
sub plot2 {
# Latitude for London
my $lat = 51.5;
my $npts = 365;
my $xmin = 0;
my $xmax = $npts*60.0*60.0*24.0;
my $ymin = 0;
my $ymax = 24;
# Formula for hours of daylight from
# "A Model Comparison for Daylength as a Function of Latitude and
# Day of the Year", 1995, Ecological Modelling, 80, pp 87-95.
my $j = sequence($npts);
my $x = $j * 60.0*60.0*24.0;
my $p = asin(0.39795*cos(0.2163108 + 2*atan(0.9671396*tan(0.00860*($j-186)))));
my $y = 24.0 - (24.0/PI) *
acos( (sin(0.8333*PI/180.0) + sin($lat*PI/180.0)*sin($p) ) /
(cos($lat*PI/180)*cos($p)) );
plcol0(1);
# Set time format to be abbreviated month name followed by day of month
pltimefmt("%b %d");
plprec(1,1);
plenv($xmin, $xmax, $ymin, $ymax, 0, 40);
plcol0(3);
pllab("Date", "Hours of daylight", '@frPLplot Example 29 - Hours of daylight at 51.5N');
plcol0(4);
plline($x, $y);
plprec(0,0);
}
# Return a 1D PDL consisting of the minimum of each pairwise
# element of the two input 1D PDLs
sub minover { return cat($_[0], $_[1])->xchg(0,1)->minimum }
sub plot3 {
# Calculate seconds since the Unix epoch for 2005-12-01 UTC.
my $tstart = timegm(0,0,0,1,11,105);
my $npts = 62;
my $xmin = $tstart;
my $xmax = $xmin + $npts*60.0*60.0*24.0;
my $ymin = 0.0;
my $ymax = 5.0;
my $i = sequence($npts);
my $x = $xmin + $i*60.0*60.0*24.0;
my $y = 1.0 + sin( 2*PI*$i / 7 ) + exp( (minover($i,$npts-$i)) / 31.0);
pladv(0);
plvsta();
plwind($xmin, $xmax, $ymin, $ymax);
plcol0(1);
# Set time format to be ISO 8601 standard YYYY-MM-DD. Note that this is
# equivalent to %f for C99 compliant implementations of strftime.
pltimefmt("%Y-%m-%d");
# Draw a box with ticks spaced every 14 days in X and 1 hour in Y.
plbox(14*24.0*60.0*60.0,14, 1, 4, "bcnstd", "bcnstv");
plcol0(3);
pllab("Date", "Hours of television watched", '@frPLplot Example 29 - Hours of television watched in Dec 2005 / Jan 2006');
plcol0(4);
plssym(0.0,0.5);
plpoin($x, $y, 2);
plline($x, $y);
}
sub plot4 {
# TAI-UTC (seconds) as a function of time.
# Use Besselian epochs as the continuous time interval just to prove
# this does not introduce any issues.
# Use the definition given in http://en.wikipedia.org/wiki/Besselian_epoch
# B = 1900. + (JD -2415020.31352)/365.242198781
# ==> (as calculated with aid of "bc -l" command)
# B = (MJD + 678940.364163900)/365.242198781
# ==>
# MJD = B*365.24219878 - 678940.364163900
my $scale = 365.242198781;
my $offset1 = -678940.;
my $offset2 = -0.3641639;
plconfigtime($scale, $offset1, $offset2, 0x0, 0, 0, 0, 0, 0, 0, 0);
my ($xmin, $xmax);
for ( my $kind = 0; $kind < 7; $kind++ )
{
if ( $kind == 0 )
{
$xmin = plctime(1950, 0, 2, 0, 0, 0);
$xmax = plctime(2020, 0, 2, 0, 0, 0);
$npts = 70 * 12 + 1;
$ymin = 0.0;
$ymax = 36.0;
$time_format = "%Y%";
$if_TAI_time_format = 1;
$title_suffix = "from 1950 to 2020";
$xtitle = "Year";
$xlabel_step = 10;
}
elsif ( $kind == 1 || $kind == 2 )
{
$xmin = plctime(1961, 7, 1, 0, 0, 1.64757 - .20);
$xmax = plctime( 1961, 7, 1, 0, 0, 1.64757 + .20);
$npts = 1001;
$ymin = 1.625;
$ymax = 1.725;
$time_format = "%S%2%";
$title_suffix = "near 1961-08-01 (TAI)";
$xlabel_step = 0.05 / ( $scale * 86400. );
if ( $kind == 1 )
{
$if_TAI_time_format = 1;
$xtitle = "Seconds (TAI)";
}
else
{
$if_TAI_time_format = 0;
$xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
elsif ( $kind == 3 || $kind == 4 )
{
$xmin = plctime(1963, 10, 1, 0, 0, 2.6972788 - .20);
$xmax = plctime(1963, 10, 1, 0, 0, 2.6972788 + .20);
$npts = 1001;
$ymin = 2.55;
$ymax = 2.75;
$time_format = "%S%2%";
$title_suffix = "near 1963-11-01 (TAI)";
$xlabel_step = 0.05 / ( $scale * 86400. );
if ( $kind == 3 )
{
$if_TAI_time_format = 1;
$xtitle = "Seconds (TAI)";
}
else
{
$if_TAI_time_format = 0;
$xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
elsif ( $kind == 5 || $kind == 6 )
{
$xmin = plctime(2009, 0, 1, 0, 0, 34. - 5);
$xmax = plctime(2009, 0, 1, 0, 0, 34. + 5);
$npts = 1001;
$ymin = 32.5;
$ymax = 34.5;
$time_format = "%S%2%";
$title_suffix = "near 2009-01-01 (TAI)";
$xlabel_step = 1. / ( $scale * 86400. );
if ( $kind == 5 )
{
$if_TAI_time_format = 1;
$xtitle = "Seconds (TAI)";
}
else
{
$if_TAI_time_format = 0;
$xtitle = "Seconds (TAI) labelled with corresponding UTC";
}
}
my (@x, @y);
for ( $i = 0; $i < $npts; $i++ )
{
$x[$i] = $xmin + $i * ( $xmax - $xmin ) / ( $npts - 1 );
plconfigtime( $scale, $offset1, $offset2, 0x0, 0, 0, 0, 0, 0, 0, 0 );
$tai = $x[$i];
($tai_year, $tai_month, $tai_day, $tai_hour, $tai_min, $tai_sec) = plbtime($tai);
plconfigtime( $scale, $offset1, $offset2, 0x2, 0, 0, 0, 0, 0, 0, 0 );
($utc_year, $utc_month, $utc_day, $utc_hour, $utc_min, $utc_sec) = plbtime($tai);
plconfigtime( $scale, $offset1, $offset2, 0x0, 0, 0, 0, 0, 0, 0, 0 );
$utc = plctime($utc_year, $utc_month, $utc_day, $utc_hour, $utc_min, $utc_sec);
$y[$i] = ( $tai - $utc ) * $scale * 86400;
}
pladv( 0 );
plvsta();
plwind( $xmin, $xmax, $ymin, $ymax );
plcol0( 1 );
if ( $if_TAI_time_format ) {
plconfigtime( $scale, $offset1, $offset2, 0x0, 0, 0, 0, 0, 0, 0, 0 );
} else {
plconfigtime( $scale, $offset1, $offset2, 0x2, 0, 0, 0, 0, 0, 0, 0 );
}
pltimefmt( $time_format );
plbox( $xlabel_step, 0, 0, 0, "bcnstd", "bcnstv" );
plcol0( 3 );
$title = '@frPLplot Example 29 - TAI-UTC ';
$title .= $title_suffix;
pllab( $xtitle, "TAI-UTC (sec)", $title );
plcol0( 4 );
plline( pdl(@x), pdl(@y) );
}
}
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