/usr/share/octave/packages/communications-1.2.1/intrlv.m is in octave-communications-common 1.2.1-5.
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 | ## Copyright (C) 2008 Sylvain Pelissier <sylvain.pelissier@gmail.com>
##
## 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{intrlvd} =} intrlv (@var{data}, @var{elements})
## Interleaved elements of @var{data} according to @var{elements}.
## @seealso{deintrlv}
## @end deftypefn
function intrlvd = intrlv (data, elements)
if (nargin != 2)
print_usage ();
endif
if (!isvector (elements))
error ("intrlv: ELEMENTS must be a vector");
endif
if (isvector (data))
if (length (elements) != length (data) || any (sort (elements) != 1:length (data)))
error ("intrlv: ELEMENTS must be a permutation of DATA indices");
endif
intrlvd = data(elements);
else
if (length (elements) != size (data, 1) || any (sort (elements) != 1:size (data, 1)))
error ("intrlv: ELEMENTS must be a permutation of DATA indices");
endif
intrlvd = data(elements,:);
endif
endfunction
%% Test input validation
%!error intrlv ()
%!error intrlv (1)
%!error intrlv (1, 2, 3)
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