/usr/share/doc/libplplot12/examples/f95/x04f.f90 is in libplplot-dev 5.10.0+dfsg2-0.1ubuntu2.
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 | ! $Id: x04f.f90 12840 2013-12-10 23:52:18Z andrewross $
! Illustration of logarithmic axes, and redefinition of window
!
! Copyright (C) 2004 Alan W. Irwin
!
! 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
program x04f95
use plplot, PI => PL_PI
use plf95demolib
implicit none
real(kind=plflt) :: freql(0:100),ampl(0:100),phase(0:100)
! Process command-line arguments
call plparseopts(PL_PARSE_FULL)
call plinit
call plfont(2)
! Make log plots using two different styles.
call plot1(0)
call plot1(1)
call plend
contains
subroutine plot1(type)
integer :: type
integer :: nlegend
real(kind=plflt) :: legend_width, legend_height
integer :: opt_array(2), text_colors(2), line_colors(2), &
line_styles(2), symbol_colors(2), symbol_numbers(2)
real(kind=plflt) :: line_widths(2), symbol_scales(2), box_scales(0)
integer :: box_colors(0), box_patterns(0)
real(kind=plflt) :: box_line_widths(0)
character(len=20) :: text(2)
character(len=1) :: symbols(2)
call pladv(0)
! Set up data for log plot.
call setdata
call plvpor(0.15_plflt, 0.85_plflt, 0.1_plflt, 0.9_plflt)
call plwind(-2.0_plflt, 3.0_plflt, -80.0_plflt, 0.0_plflt)
call plcol0(1)
! Try different axis and labelling styles.
if (type.eq.0) then
call plbox('bclnst', 0.0_plflt, 0, 'bnstv', 0.0_plflt, 0)
elseif (type.eq.1) then
call plbox('bcfghlnst', 0.0_plflt, 0, 'bcghnstv', 0.0_plflt, 0)
else
stop 'plot1: invalid type'
endif
! Plot ampl vs freq.
call plcol0(2)
call plline(freql,ampl)
call plcol0(2)
call plptex(1.6_plflt, -30.0_plflt, 1.0_plflt, -20.0_plflt, 0.5_plflt, &
'-20 dB/decade')
! Put labels on.
call plcol0(1)
call plmtex('b', 3.2_plflt, 0.5_plflt, 0.5_plflt, 'Frequency')
call plmtex('t', 2.0_plflt, 0.5_plflt, 0.5_plflt, &
'Single Pole Low-Pass Filter')
call plcol0(2)
call plmtex('l', 5.0_plflt, 0.5_plflt, 0.5_plflt, 'Amplitude (dB)')
nlegend = 1
! For the gridless case, put phase vs freq on same plot.
if(type == 0) then
call plcol0(1)
call plwind(-2.0_plflt, 3.0_plflt, -100.0_plflt, 0.0_plflt)
call plbox(' ', 0.0_plflt, 0, 'cmstv', 30.0_plflt, 3)
call plcol0(3)
call plline(freql, phase)
call plstring(freql, phase, '*')
call plcol0(3)
call plmtex('r', 5.0_plflt, 0.5_plflt, 0.5_plflt, &
'Phase shift (degrees)')
nlegend = 2
endif
! Draw a legend
! First legend entry.
opt_array(1) = PL_LEGEND_LINE
text_colors(1) = 2
text(1) = 'Amplitude'
line_colors(1) = 2
line_styles(1) = 1
line_widths(1) = 1
! note from the above opt_array the first symbol (and box) indices
! do not have to be specified, at least in C. For Fortran we need
! to set the symbols to be something, since the string is always
! copied as part of the bindings.
symbols(1) = ''
! Second legend entry.
opt_array(2) = PL_LEGEND_LINE + PL_LEGEND_SYMBOL
text_colors(2) = 3
text(2) = 'Phase shift'
line_colors(2) = 3
line_styles(2) = 1
line_widths(2) = 1
symbol_colors(2) = 3
symbol_scales(2) = 1.0
symbol_numbers(2) = 4
symbols(2) = '*'
! from the above opt_arrays we can completely ignore everything
! to do with boxes. (Hence the size 0 for the associated arrays)
! (note: use the argument nlegend explicitly)
call plscol0a( 15, 32, 32, 32, 0.70_plflt )
call pllegend( legend_width, legend_height, &
PL_LEGEND_BACKGROUND + PL_LEGEND_BOUNDING_BOX, 0, &
0.0_plflt, 0.0_plflt, 0.1_plflt, 15, &
1, 1, 0, 0, &
nlegend, opt_array, &
1.0_plflt, 1.0_plflt, 2.0_plflt, &
1.0_plflt, text_colors, text, &
box_colors, box_patterns, box_scales, box_line_widths, &
line_colors, line_styles, line_widths, &
symbol_colors, symbol_scales, symbol_numbers, symbols )
end subroutine plot1
subroutine setdata
real(kind=plflt), dimension(lbound(freql,1):ubound(freql,1)) :: freq
real(kind=plflt) :: f0
f0 = 1._plflt
freql = -2.0_plflt + arange(lbound(freql,1),ubound(freql,1)+1) / 20.0_plflt
freq = 10.0_plflt ** freql
ampl = 20.0_plflt * log10(1.0_plflt/sqrt(1.0_plflt+(freq/f0)**2))
phase = -(180.0_plflt/PI)*atan(freq/f0)
end subroutine setdata
end program x04f95
|