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reedmullerenc.m

## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
## 
## 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 2 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} {}  reedmullerenc (@var{MSG},@var{R},@var{M})
##
## Definition type construction of Reed Muller code,
## of order @var{R}, length @math{2^M}. This function
## returns the generator matrix for the said order RM code.
## 
## Encodes the given message word/block, of column size k, 
## corresponding to the RM(@var{R},@var{M}), and outputs a
## code matrix @var{C}, on each row with corresponding codeword.
## The second return value is the @var{G}, which is generator matrix
## used for this code.
##
## @example
## @group
## MSG=[rand(10,11)>0.5];
## [C,G]=reedmullerenc(MSG,2,4);
##
## @end group
## @end example
## 
## @end deftypefn
## @seealso{reedmullerdec,reedmullergen}
function [C,G]=reedmullerenc(MSG,R,M)
      if ( nargin < 3 )
         print_usage();
      end
     G=reedmullergen(R,M);
     if ( columns(MSG) ~= rows(G) )
        error('MSG size must be corresponding to (R,M) message size');
     end
     C=zeros(rows(MSG),2.^M);
     for idx=1:rows(MSG)
         C(idx,:)=mod(MSG(idx,:)*G,2);
     end
     return
end

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