Mercurial > forge
view main/comm/inst/shannonfanoenco.m @ 2801:4d910c2b101f octave-forge
Fixing copyright statement as David requested.
author | gnumuthu |
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date | Wed, 06 Dec 2006 14:46:18 +0000 |
parents | 932c17e43b4a |
children | 73fa4496fb07 |
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## Copyright (C) 2006 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, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## ## -*- texinfo -*- ## @deftypefn {Function File} {} shannonfanoenco (@var{hcode},@var{dict}) ## ## Returns the Shannon Fano encoded signal using @var{dict}. ## This function uses a @var{dict} built from the @code{shannonfanodict} ## and uses it to encode a signal list into a shannon fano code. ## Restrictions include a signal set that strictly belongs in the ## @code{range [1,N]} with @code{N=length(dict)}. Also dict can only be ## from the @code{shannonfanodict()} routine. ## An example use of @code{shannonfanoenco} is ## ## @example ## @group ## hd=shannonfanodict(1:4,[0.5 0.25 0.15 0.10]) ## shannonfanoenco(1:4,hd) # [ 0 1 0 1 1 0 1 1 1 0] ## @end group ## @end example ## @end deftypefn ## @seealso{shannonfanodeco, shannonfanodict} ## function sf_code=shannonfanoenco(sig,dict) if nargin < 2 error('usage: huffmanenco(sig,dict)'); end if (max(sig) > length(dict)) || ( min(sig) < 1) error("signal has elements that are outside alphabet set ... Cannot encode."); end sf_code=[dict{sig}]; return end %! %! assert(shannonfanoenco(1:4, shannonfanodict(1:4,[0.5 0.25 0.15 0.10])),[ 0 1 0 1 1 0 1 1 1 0],0) %!