X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?a=blobdiff_plain;f=octave_packages%2Fcommunications-1.1.1%2Fhelscanintrlv.m;fp=octave_packages%2Fcommunications-1.1.1%2Fhelscanintrlv.m;h=891a2329142de631bf628d37376f252099fa9b28;hb=c880e8788dfc484bf23ce13fa2787f2c6bca4863;hp=0000000000000000000000000000000000000000;hpb=1705066eceaaea976f010f669ce8e972f3734b05;p=CreaPhase.git

diff --git a/octave_packages/communications-1.1.1/helscanintrlv.m b/octave_packages/communications-1.1.1/helscanintrlv.m
new file mode 100644
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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