/usr/share/octave/packages/communications-1.1.1/apkconst.m is in octave-communications-common 1.1.1-1.
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 | ## Copyright (C) 2003 David Bateman
##
## 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 3 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.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} apkconst (@var{nsig})
## @deftypefnx {Function File} {} apkconst (@var{nsig},@var{amp})
## @deftypefnx {Function File} {} apkconst (@var{nsig},@var{amp},@var{phs})
## @deftypefnx {Function File} {} apkconst (@var{...},"n")
## @deftypefnx {Function File} {} apkconst (@var{...},@var{str})
## @deftypefnx {Function File} {@var{y} = } apkconst (@var{...})
##
## Plots a ASK/PSK signal constellation. Argument @var{nsig} is a real vector
## whose length determines the number of ASK radii in the constellation.
## The values of vector @var{nsig} determine the number of points in each
## ASK radii.
##
## By default the radii of each ASK modulated level is given by the index of
## @var{nsig}. The amplitudes can be defined explictly in the variable
## @var{amp}, which is a vector of the same length as @var{nsig}.
##
## By default the first point in each ASK radii has zero phase, and following
## points are coding in an anti-clockwise manner. If @var{phs} is defined then
## it is a vector of the same length as @var{nsig} defining the initial phase
## in each ASK radii.
##
## In addition @dfn{apkconst} takes two string arguments 'n' and and @var{str}.
## If the string 'n' is included in the arguments, then a number is printed
## next to each constellation point giving the symbol value that would be
## mapped to this point by the @dfn{modmap} function. The argument @var{str}
## is a plot style string (example 'r+') and determines the default gnuplot
## point style to use for plot points in the constellation.
##
## If @dfn{apskconst} is called with a return argument, then no plot is
## created. However the return value is a vector giving the in-phase and
## quadrature values of the symbols in the constellation.
## @end deftypefn
## @seealso{dmod,ddemod,modmap,demodmap}
## 2005-04-23 Dmitri A. Sergatskov <dasergatskov@gmail.com>
## * modified for new gnuplot interface (octave > 2.9.0)
function yout = apkconst(varargin)
if ((nargin < 1) || (nargin > 5))
error ("apkconst: incorrect number of arguments");
endif
numargs = 0;
printnums = 0;
fmt = "+r";
amp = [];
phs = [];
for i=1:length(varargin)
arg = varargin{i};
if (ischar(arg))
if (strcmp(arg,"n"))
try
text();
printnums = 1;
catch
printnums = 0;
end
else
fmt = arg;
endif
else
numargs++;
switch (numargs)
case 1,
nsig = arg;
case 2,
amp = arg;
case 3,
phs = arg;
otherwise
error ("apkconst: too many numerical arguments");
endswitch
endif
end
if (numargs < 1)
error ("apkconst: must have at least one vector argument");
endif
if (isempty(amp))
amp = 1:length(nsig);
endif
if (isempty(phs))
phs = zeros(size(amp));
endif
if (!isvector(nsig) || !isvector(amp) || !isvector(phs) || ...
(length(nsig) != length(amp)) || (length(nsig) != length(phs)))
error ("apkconst: numerical arguments must be vectors of the same length");
endif
if (length(nsig) == 0)
error ("apkconst: first numerical argument must have non-zero length");
endif
y = [];
for i=1:length(nsig)
if (nsig(i) < 1)
error ("apkconst: must have at least one point in ASK radii");
endif
y = [y; amp(i) * [cos(2*pi*[0:nsig(i)-1]'/nsig(i) + phs(i)) + ...
1i*sin(2*pi*[0:nsig(i)-1]'/nsig(i) + phs(i))]];
end
if (nargout == 0)
r = [0:0.02:2]'*pi;
x0 = cos(r) * amp;
y0 = sin(r) * amp;
plot(x0, y0, "b");
yy = [real(y), imag(y)];
hold on;
if (printnums)
xd = 0.05 * max(real(y));
for i=1:length(y)
text(real(y(i))+xd,imag(y(i)),num2str(i-1));
end
endif
plot (real(y), imag(y), fmt);
title("ASK/PSK Constellation");
xlabel("In-phase");
ylabel("Quadrature");
else
yout = y;
endif
endfunction
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