/usr/share/octave/packages/communications-1.2.1/randint.m is in octave-communications-common 1.2.1-2.
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 | ## Copyright (C) 2001 Laurent Mazet
##
## 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{b} =} randint (@var{n})
## @deftypefnx {Function File} {@var{b} =} randint (@var{n}, @var{m})
## @deftypefnx {Function File} {@var{b} =} randint (@var{n}, @var{m}, @var{range})
## @deftypefnx {Function File} {@var{b} =} randint (@var{n}, @var{m}, @var{range}, @var{seed})
##
## Generate a matrix of random binary numbers. The size of the matrix is
## @var{n} rows by @var{m} columns. By default @var{m} is equal to @var{n}.
##
## The range in which the integers are generated will is determined by
## the variable @var{range}. If @var{range} is an integer, the value will
## lie in the range [0,@var{range}-1], or [@var{range}+1,0] if @var{range}
## is negative. If @var{range} contains two elements the integers will lie
## within these two elements, inclusive. By default @var{range} is
## assumed to be [0:1].
##
## The variable @var{seed} allows the random number generator to be seeded
## with a fixed value. The initial seed will be restored when returning.
## @end deftypefn
function b = randint (n, m, range, seed)
switch (nargin)
case 1
m = n;
range = [0, 1];
seed = Inf;
case 2
range = [0, 1];
seed = Inf;
case 3
seed = Inf;
case 4
otherwise
print_usage ();
endswitch
## Check range
if (length (range) == 1)
if (range < 0)
range = [range+1, 0];
else
range = [0, range-1];
endif
elseif ( prod (size (range)) != 2)
error ("randint: RANGE must be a scalar or a 2-element vector");
endif
range = sort (range);
## Check seed;
if (!isinf (seed))
old_seed = rand ("seed");
rand ("seed", seed);
endif
b = range (1) - 1 + ceil (rand (n, m) * (range (2) - range (1) + 1));
## Get back to the old
if (!isinf (seed))
rand ("seed", old_seed);
endif
endfunction
%!shared n, m, seed, a1, a2, a3, a4, a5, a6
%! n = 10; m = 32; seed = 1; a1 = randint (n); a2 = randint (n, n);
%! a3 = randint (n, n, m); a4 = randint (n, n, [-m, m]);
%! a5 = randint (n, n, m, seed); a6 = randint (n, n, m, seed);
%!error randint ();
%!error randint (n, n, n, n, n);
%!assert (size (a1) == [n, n] && size (a2) == [n, n]);
%!assert (max ([a1(:); a2(:)]) <= 1 && min ([a1(:); a2(:)]) >= 0);
%!assert (size (a3) == [n, n] && size (a4) == [n, n]);
%!assert (max (a3(:)) < m && min (a3(:)) >= 0);
%!assert (max (a4(:)) <= m && min (a4(:)) >= -m);
%!assert (a5(:) == a6(:));
%!test
%! a = randint (10, 10, -32);
%! assert (max (a(:)) <= 0 && min (a(:)) > -32);
%% Test input validation
%!error randint (1, 2, 3, 4, 5)
%!error randint (1, 1, [1 2 3])
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