Add a useful package (from Source forge) for octave

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

diff --git a/octave_packages/communications-1.1.1/helintrlv.m b/octave_packages/communications-1.1.1/helintrlv.m
new file mode 100644 (file)
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+++ b/octave_packages/communications-1.1.1/helintrlv.m
@@ -0,0 +1,71 @@
+## 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} =} helintrlv (@var{data}, @var{col}, @var{ngrp},@var{stp})
+## @var{col}-by-@var{ngrp}.
+## @seealso{heldeintrlv}
+## @end deftypefn
+
+function [outdata,outstate] = helintrlv(data,col,ngrp,stp,init_state)
+
+       if (nargin < 4  ||nargin>5)
+               error('usage : interlvd = helintrlv(data,col,ngrp,stp)');
+       end
+
+       if(~isscalar(col) || ~isscalar(ngrp))
+               error("col and ngrp must be integers");
+       end
+       
+       if( col ~= floor(col)|| ngrp ~= floor(ngrp))
+               error("col and ngrp must be integers");
+       end
+
+       didTranspose=0;
+       if ( isvector(data) && columns(data) > rows(data) )
+               data = data.';
+               didTranspose=1;
+       end
+
+       s = size(data);
+
+       if s(1) ~= col*ngrp
+               error("The length of data must be equals to ngrp*col");
+       end
+
+       if nargin==4
+               init_state = zeros(stp*col*(col-1)/2,s(2));
+       end
+
+       outstate =[];
+       # for each column
+       for k = 1:s(2)
+               tmp = reshape( data(:,k) , ngrp, col );
+               instate = init_state(:,k);
+               outstateCol=[];
+               for k1=2:col
+                       curStepSize = (k1-1)*stp;
+                       tmpCol= [instate(1:curStepSize) ;tmp(:,k1)];
+                       tmp(:,k1) = tmpCol(1:ngrp);
+                       outstateCol=[outstateCol;tmpCol(end+1-curStepSize:end)];
+                       instate = instate(curStepSize+1:end);
+               end
+               outdata(:,k) = reshape(tmp.',s(1),1);
+               outstate =  [outstate outstateCol];
+       end
+
+       if didTranspose
+               outdata = outdata.';
+       end