/usr/share/doc/libplplot12/examples/octave/x29c.m is in octave-plplot 5.10.0+dfsg-1.
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##
## Sample plots using date / time formatting for axes
##
## Copyright (C) 2007, 2008 Andrew Ross
##
##
## 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
##
1;
##
function ix29c
## Parse command line arguments */
## plparseopts(&argc, argv, PL_PARSE_FULL);
## Initialize plplot
plinit();
plsesc('@');
plot1();
plot2();
plot3();
plot4();
## Clean up
plend1();
endfunction
## Plot a model diurnal cycle of temperature
function plot1
## Data points every 10 minutes for 1 day
npts = 73;
xmin = 0;
xmax = 60.0*60.0*24.0; ## Number of seconds in a day
ymin = 10.0;
ymax = 20.0;
i = 0:npts-1;
x = i*xmax/npts;
y = 15.0 - 5.0*cos( 2*pi*i/npts);
xerr1 = x-60.0*5.0;
xerr2 = x+60.0*5.0;
yerr1 = y-0.1;
yerr2 = y+0.1;
pladv(0);
## Rescale major ticks marks by 0.5
plsmaj(0.0,0.5);
## Rescale minor ticks and error bar marks by 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("bcnstd", 3.0*60*60, 3, "bcnstv", 1, 5);
plcol0(3);
pllab("Time (hours:mins)", "Temperature (degC)", "@frPLplot Example 29 - Daily temperature");
plcol0(4);
plline(x', y');
plcol0(2);
plerrx(xerr1', xerr2', y');
plcol0(3);
plerry(x', yerr1', yerr2');
## Rescale major / minor tick marks back to default
plsmin(0.0,1.0);
plsmaj(0.0,1.0);
endfunction
## Plot the number of hours of daylight as a function of day for a year
function plot2
## Latitude for London
lat = 51.5;
npts = 365;
xmin = 0;
xmax = npts*60.0*60.0*24.0;
ymin = 0;
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.
i = 0:npts-1;
x = i*60.0*60.0*24.0;
p = asin(0.39795*cos(0.2163108 + 2*atan(0.9671396*tan(0.00860*(i-186)))));
d = 24.0 - (24.0/pi)*acos( (sin(0.8333*pi/180.0) +
sin(lat*pi/180.0)*sin(p))
./(cos(lat*pi/180.0)*cos(p)) );
y = d;
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);
endfunction
function plot3
## Calculate seconds since the Unix epoch for 2005-12-01 UTC.
tm.year = 105; ## Years since 1900
tm.mon = 11; ## 0 == January, 11 = December
tm.mday = 1; ## 1 = 1st of month
tm.hour = 0;
tm.min = 0;
tm.sec = 0;
## NB - no need to call tzset in octave - it doesn't exist.
tz = getenv("TZ");
putenv("TZ","");
## tstart is a time_t value (cast to PLFLT) which represents the number
## of seconds elapsed since 00:00:00 on January 1, 1970, Coordinated
## Universal Time (UTC).
tstart = mktime(tm);
## Note currently octave appears to have no way to unset a env
## variable.
putenv("TZ",tz);
npts = 62;
xmin = tstart;
xmax = xmin + npts*60.0*60.0*24.0;
ymin = 0.0;
ymax = 5.0;
i = 0:npts-1;
x = xmin + i*60.0*60.0*24.0;
y = 1.0 + sin( 2*pi*i / 7.0 ) + exp( min(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("bcnstd", 14*24.0*60.0*60.0,14, "bcnstv", 1, 4);
plcol0(3);
pllab("Date", "Hours of television watched", "@frPLplot Example 29 - Hours of television watched in Dec 2005 / Jan 2006");
plcol0(4);
## Rescale symbol size (used by plpoin) by 0.5
plssym(0.0,0.5);
plpoin(x', y', 2);
plline(x', y');
endfunction
function 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
scale = 365.242198781;
offset1 = -678940.;
offset2 = -0.3641639;
plconfigtime(scale, offset1, offset2, 0x0, 0, 0, 0, 0, 0, 0, 0.);
for kind=0:6
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.;
elseif (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";
endif
elseif (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";
endif
elseif (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";
endif
endif
x = xmin + (0:npts-1)*(xmax-xmin)/(npts-1);
plconfigtime(scale, offset1, offset2, 0x0, 0, 0, 0, 0, 0, 0, 0.);
tai = x;
for i=1:npts
[tai_year(i) , tai_month(i), tai_day(i), tai_hour(i), tai_min(i), tai_sec(i)] = plbtime(tai(i));
endfor
plconfigtime(scale, offset1, offset2, 0x2, 0, 0, 0, 0, 0, 0, 0.);
for i=1:npts
[utc_year(i), utc_month(i), utc_day(i), utc_hour(i), utc_min(i), utc_sec(i)] = plbtime(tai(i));
endfor
plconfigtime(scale, offset1, offset2, 0x0, 0, 0, 0, 0, 0, 0, 0.);
for i=1:npts
utc(i) = plctime(utc_year(i), utc_month(i), utc_day(i), utc_hour(i), utc_min(i), utc_sec(i));
endfor
y = (tai-utc)*scale*86400.0;
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.);
endif
pltimefmt(time_format);
plbox("bcnstd", xlabel_step, 0, "bcnstv", 0., 0);
plcol0(3);
title = ["@frPLplot Example 29 - TAI-UTC ", title_suffix];
pllab(xtitle, "TAI-UTC (sec)", title);
plcol0(4);
plline(x', y');
endfor
endfunction
ix29c
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