/usr/share/doc/libplplot12/examples/octave/x18c.m is in octave-plplot 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 | ## Copyright (C) 1998, 1999, 2000 Joao Cardoso
## Copyright (C) 2004 Rafael Laboissiere
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by the
## Free Software Foundation; either version 2 of the License, or (at your
## option) any later version.
##
## This program 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
## General Public License for more details.
##
## This file is part of plplot_octave.
## It is based on the corresponding demo function of PLplot.
1;
global alt = [20.0, 35.0, 50.0, 65.0];
global az = [30.0, 40.0, 50.0, 60.0];
## Does a series of 3-d plots for a given data set, with different
## viewing options in each plot.
function ix18c
global alt;
global az;
global opt = [ 1, 0, 1, 0 ];
NPTS = 1000;
## Parse and process command line arguments */
## (void) plparseopts(&argc, argv, PL_PARSE_FULL);
## Initialize plplot */
plinit();
for k=0:3
test_poly(k);
endfor
## From the mind of a sick and twisted physicist... */
for i = 0:NPTS-1
z(i+1) = -1. + 2. * i / NPTS;
## Pick one ... */
# r = 1. - ( (float) i / (float) NPTS ); */
r = z(i+1);
x(i+1) = r * cos( 2. * pi * 6. * i / NPTS );
y(i+1) = r * sin( 2. * pi * 6. * i / NPTS );
endfor
for k = 0:3
pladv(0);
plvpor(0.0, 1.0, 0.0, 0.9);
plwind(-1.0, 1.0, -0.9, 1.1);
plcol0(1);
plw3d(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, alt(k+1), az(k+1));
plbox3("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0);
plcol0(2);
if (opt(k+1))
plline3( x', y', z' );
else
## U+22C5 DOT OPERATOR.
plstring3( x', y', z', "⋅" );
endif
plcol0(3);
title=sprintf("#frPLplot Example 18 - Alt=%.0f, Az=%.0f",
alt(k+1), az(k+1));
plmtex("t", 1.0, 0.5, 0.5, title);
endfor
plend1();
endfunction
function y = THETA(a)
y = 2 * pi * (a) /20.;
endfunction
function y= PHI(a)
y = pi * (a) / 20.1;
endfunction
function test_poly(k)
global alt;
global az;
draw = [ 1, 1, 1, 1;
1, 0, 1, 0;
0, 1, 0, 1;
1, 1, 0, 0];
two_pi = 2. * pi;
pladv(0);
plvpor(0.0, 1.0, 0.0, 0.9);
plwind(-1.0, 1.0, -0.9, 1.1);
plcol0(1);
plw3d(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, alt(k+1), az(k+1));
plbox3("bnstu", "x axis", 0.0, 0,
"bnstu", "y axis", 0.0, 0,
"bcdmnstuv", "z axis", 0.0, 0);
plcol0(2);
for i=0:19
for j=0:19
pj=pi*j/20.1; pj1=pi*(j+1)/20.1;
ti=2*pi*i/20; ti1=2*pi*(i+1)/20;
x(1) = sin( pj ) * cos( ti );
y(1) = sin( pj ) * sin( ti );
z(1) = cos( pj );
x(2) = sin( pj1 ) * cos( ti );
y(2) = sin( pj1 ) * sin( ti );
z(2) = cos( pj1 );
x(3) = sin( pj1 ) * cos( ti1 );
y(3) = sin( pj1 ) * sin( ti1 );
z(3) = cos( pj1 );
x(4) = sin( pj ) * cos( ti1 );
y(4) = sin( pj ) * sin( ti1 );
z(4) = cos( pj );
x(5) = sin( pj ) * cos( ti );
y(5) = sin( pj ) * sin( ti );
z(5) = cos( pj );
plpoly3(x', y', z', draw(k+1,:)', -1); ## added an extra argument, with the sign
endfor
endfor
plcol0(3);
plmtex("t", 1.0, 0.5, 0.5, "unit radius sphere" );
endfunction
ix18c
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