/usr/share/octave/packages/communications-1.1.1/gfweight.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 | ## 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} {@var{w} = } gfweight (@var{gen})
## @deftypefnx {Function File} {@var{w} = } gfweight (@var{gen},'gen')
## @deftypefnx {Function File} {@var{w} = } gfweight (@var{par},'par')
## @deftypefnx {Function File} {@var{w} = } gfweight (@var{p},n)
##
## Calculate the minimum weight or distance of a linear block code. The
## code can be either defined by its generator or parity check matrix, or
## its generator polynomial. By default if the first argument is a matrix,
## it is assumed to be the generator matrix of the code. The type of the
## matrix can be defined by a flag 'gen' for the generator matrix or
## 'par' for the parity check matrix.
##
## If the first argument is a vector, it is assumed that it defines the
## generator polynomial of the code. In this case a second argument is
## required that defines the codeword length.
##
## @end deftypefn
## @seealso{hammgen,cyclpoly,bchpoly}
function w = gfweight (arg1, arg2)
if ((nargin < 1) || (nargin > 2))
usage ("gfweight(mat,typ) or gfweight(poly,n)");
endif
if (isvector(arg1))
if (nargin != 2)
error ("gfweight: need the codeword length if passing generator polynomial");
endif
[ign, gen] = cyclgen(arg2, arg1);
elseif (ismatrix(arg1))
if (nargin == 2)
if (ischar(arg2))
if (strcmp(arg2,"gen"))
gen = arg1;
elseif (strcmp(arg2,"par"))
gen = gen2par(arg1);
else
error ("gfweight: unrecognized string argument");
endif
else
error ("gfweight: if first argument is a matrix, the second must be a string");
endif
else
gen = arg1;
endif
else
error ("gfweight: first argument must be a matrix or a vector");
endif
[k, n] = size(gen);
if (n < k)
error ("gfweight: generator matrix in an illegal form");
endif
## We only need to test codewords 1:2^k-1 against the zero code word
## We do the equivalent of
## w = min(sum((mod(de2bi([1:2^k-1]') * gen, 2))'));
## But in a more memory efficient manner in an oct-file
w = __gfweight__(gen);
endfunction
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