/usr/share/octave/packages/communications-1.1.1/helscanintrlv.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 | ## Copyright (C) 2010 Mark Borgerding <mark@borgerding.net>
##
## 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{outdata} =} helscanintrlv (@var{data}, @var{nrows}, @var{ncols},@var{Nshift})
## @var{nrows}-by-@var{ncols}.
## @seealso{helscandeintrlv}
## @end deftypefn
function outdata = helscanintrlv(data,Nrows,Ncols,Nshift)
if(nargin ~= 4 )
error('usage : interlvd = helscanintrlv(data,Nrows,Ncols,Nshift)');
end
if(~isscalar(Nrows) || ~isscalar(Ncols))
error("Nrows and Ncols must be integers");
end
if( Nrows ~= floor(Nrows)|| Ncols ~= floor(Ncols))
error("Nrows and Ncols must be integers");
end
didTranspose=0;
if ( isvector(data) && columns(data) > rows(data) )
data = data.';
didTranspose=1;
end
s = size(data);
if size(data,1) ~= Nrows*Ncols
error("The length of data must be equals to Ncols*Nrows");
end
# create the interleaving indices
idx0 = 0:Nrows*Ncols-1;
idxMod = rem(idx0,Ncols);
idxFlr = idx0 - idxMod;
inds = 1+rem(idxFlr + idxMod * Ncols * Nshift + idxMod,Nrows*Ncols);
# for each column
for k = 1:s(2)
outdata(:,k) = data(inds,k);
end
if didTranspose
outdata = outdata.';
end
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