/usr/share/doc/libplplot11/examples/f77/x01f.f is in libplplot-dev 5.9.9-2ubuntu2.
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c Simple line plot and multiple windows demo.
c
c Copyright (C) 2004 Alan W. Irwin
c
c This file is part of PLplot.
c
c PLplot is free software; you can redistribute it and/or modify
c it under the terms of the GNU Library General Public License as
c published by the Free Software Foundation; either version 2 of the
c License, or (at your option) any later version.
c
c PLplot is distributed in the hope that it will be useful,
c but WITHOUT ANY WARRANTY; without even the implied warranty of
c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
c GNU Library General Public License for more details.
c
c You should have received a copy of the GNU Library General Public
c License along with PLplot; if not, write to the Free Software
c Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
implicit none
real*8 x(101), y(101)
real*8 xs(6), ys(6)
real*8 xscale, yscale, xoff, yoff
common /plotdat/ x, y, xs, ys, xscale, yscale, xoff, yoff
character*80 version
integer digmax
include 'plplot_parameters.h'
c some fortran compilers demand typing of intrinsic lnblnk, and
c although this is not demanded on g77 it also works there.
integer lnblnk
c Process command-line arguments
call plparseopts(PL_PARSE_FULL)
c Print plplot version
call plgver(version)
write (*,'(a,a)') 'PLplot library version: ',
& version(:lnblnk(version))
c Initialize plplot
c Divide page into 2x2 plots
call plstar(2,2)
c Set up the data
c Original case
xscale = 6.d0
yscale = 1.d0
xoff = 0.d0
yoff = 0.d0
c Do a plot
call plot1()
c Set up the data
xscale = 1.d0
yscale = 0.0014d0
yoff = 0.0185d0
c Do a plot
digmax = 5
call plsyax(digmax, 0)
call plot1()
call plot2()
call plot3()
c Don't forget to call PLEND to finish off!
call plend()
end
c======================================================================
subroutine plot1()
implicit none
real*8 x(101), y(101)
real*8 xs(6), ys(6)
real*8 xscale, yscale, xoff, yoff,
& xmin, xmax, ymin, ymax
integer i
common /plotdat/ x, y, xs, ys, xscale, yscale, xoff, yoff
do i = 1, 60
x(i) = xoff + xscale * dble(i)/60.0d0
y(i) = yoff + yscale * x(i)**2
enddo
xmin = x(1)
xmax = x(60)
ymin = y(1)
ymax = y(60)
do i = 1, 6
xs(i) = x((i-1)*10+4)
ys(i) = y((i-1)*10+4)
enddo
c Set up the viewport and window using PLENV. The range in X is
c 0.0 to 6.0, and the range in Y is 0.0 to 30.0. The axes are
c scaled separately (just = 0), and we just draw a labelled
c box (axis = 0).
call plcol0(1)
call plenv( xmin, xmax, ymin, ymax, 0, 0 )
call plcol0(2)
call pllab( '(x)', '(y)', '#frPLplot Example 1 - y=x#u2' )
c Plot the data points
call plcol0(4)
call plpoin( 6, xs, ys, 9 )
c Draw the line through the data
call plcol0(3)
call plline( 60, x, y )
end
c======================================================================
subroutine plot2()
real*8 x(101), y(101)
real*8 xs(6), ys(6)
real*8 xscale, yscale, xoff, yoff
integer i
common /plotdat/ x, y, xs, ys, xscale, yscale, xoff, yoff
c======================================================================
c
c Set up the viewport and window using PLENV. The range in X is
c -2.0 to 10.0, and the range in Y is -0.4 to 2.0. The axes are
c scaled separately (just = 0), and we draw a box with axes
c (axis = 1).
call plcol0(1)
call plenv(-2.0d0, 10.0d0, -0.4d0, 1.2d0, 0, 1 )
call plcol0(2)
call pllab( '(x)', 'sin(x)/x',
& '#frPLplot Example 1 - Sinc Function' )
c Fill up the arrays
do i = 1, 100
x(i) = (i-20.0d0)/6.0d0
y(i) = 1.0d0
if (x(i) .ne. 0.0d0) y(i) = sin(x(i)) / x(i)
enddo
c Draw the line
call plcol0(3)
call plwid(2)
call plline( 100, x, y )
call plwid(1)
end
c======================================================================
subroutine plot3()
c
c For the final graph we wish to override the default tick intervals,
c and so do not use_ PLENV
include 'plplot_parameters.h'
real*8 x(101), y(101)
real*8 xs(6), ys(6)
real*8 xscale, yscale, xoff, yoff
integer i
common /plotdat/ x, y, xs, ys, xscale, yscale, xoff, yoff
call pladv(0)
c Use_ standard viewport, and define X range from 0 to 360 degrees,
c Y range from -1.2 to 1.2.
call plvsta()
call plwind( 0.0d0, 360.0d0, -1.2d0, 1.2d0 )
c Draw a box with ticks spaced 60 degrees apart in X, and 0.2 in Y.
call plcol0(1)
call plbox( 'bcnst', 60.0d0, 2, 'bcnstv', 0.2d0, 2 )
c Superimpose a dashed line grid, with 1.5 mm marks and spaces. With
c only a single mark and space element, we do not need arrays
call plstyl( 1, 1500, 1500 )
call plcol0(2)
call plbox( 'g', 30.0d0, 0, 'g', 0.2d0, 0 )
call plstyl( 0, 0, 0 )
call plcol0(3)
call pllab( 'Angle (degrees)', 'sine',
& '#frPLplot Example 1 - Sine function' )
do i = 1, 101
x(i) = 3.6d0 * (i-1)
y(i) = sin( x(i) * PI/180.0d0 )
enddo
call plcol0(4)
call plline( 101, x, y )
end
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