## [46726a]: inst / unaryenc.m Maximize Restore History

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53``` ```## Copyright (C) 2006 Muthiah Annamalai ## ## 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 . ## -*- texinfo -*- ## @deftypefn {Function File} {} unaryenc (@var{value}) ## ## This function encodes the decimal value. ## Useful if you are trying to perform golomb-rice coding ## value needs to be a number or row-vector. @var{value} ## is a non-negative number. ## ## Unary encoding of a +ve number N is done as follows, ## use N-ones followed by one zero. For instance, the ## unary coded value of 5 will be then (111110) in base2 ## which is 31x2 = 62. From this definition, decoding follows. ## ## @example ## @group ## message = [5 4 4 1 1 1] ## coded = unaryenc(message) ## @result{} [62 30 30 2 2 2] ## unarydec(coded) ## @result{} [5 4 4 1 1 1] ## @end group ## @end example ## @end deftypefn ## @seealso{unarydec} ## ## Optimal for exponential sequences ## pow(2,-n) kind of sequences this is optimal. ## function rval=unaryenc(val) if val==0 rval=val; return end rval=2.^(val)-1; % add somany 1's rval=rval*2; % append 0 end %!assert(unaryenc([5 4 4 1 1 1]), [62 30 30 2 2 2],1) ```