Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / communications-1.1.1 / helscanintrlv.m

diff --git a/octave_packages/communications-1.1.1/helscanintrlv.m b/octave_packages/communications-1.1.1/helscanintrlv.m
new file mode 100644 (file)
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+++ b/octave_packages/communications-1.1.1/helscanintrlv.m
@@ -0,0 +1,61 @@
+## 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