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view main/comm/inst/de2bi.m @ 9666:67d4cfc5eeb3 octave-forge
comm: update license to GPLv3+
author | carandraug |
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date | Tue, 13 Mar 2012 04:31:21 +0000 |
parents | 2de537641f94 |
children | 5856341fb43b |
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## Copyright (C) 2001 Laurent Mazet ## ## 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{b} = } de2bi (@var{d}) ## @deftypefnx {Function File} {@var{b} = } de2bi (@var{d},@var{n}) ## @deftypefnx {Function File} {@var{b} = } de2bi (@var{d},@var{n},@var{p}) ## @deftypefnx {Function File} {@var{b} = } de2bi (@var{d},@var{n},@var{p},@var{f}) ## ## Convert a non-negative integer to bit vector. ## ## The variable @var{d} must be a vector of non-negative integers. @dfn{de2bi} ## then returns a matrix where each row represents the binary representation ## of elements of @var{d}. If @var{n} is defined then the returned matrix ## will have @var{n} columns. This number of columns can be either larger ## than the minimum needed and zeros will be added to the msb of the ## binary representation or smaller than the minimum in which case the ## least-significant part of the element is returned. ## ## If @var{p} is defined then it is used as the base for the decomposition ## of the returned values. That is the elements of the returned value are ## between '0' and 'p-1'. ## ## The variable @var{f} defines whether the first or last element of @var{b} ## is considered to be the most-significant. Valid values of @var{f} are ## 'right-msb' or 'left-msb'. By default @var{f} is 'right-msb'. ## @end deftypefn ## @seealso{bi2de} ## 2001-02-02 ## initial release ## 2003-02-02 ## add orientation of b and help in texinfo function b = de2bi(d, n, p, f) if (nargin == 1) p = 2; n = floor ( log (max (max (d), 1)) ./ log (p) ) + 1; f = 'right-msb'; elseif (nargin == 2) p = 2; if (ischar(n)) f = n; n = floor ( log (max (max (d), 1)) ./ log (p) ) + 1; else f = 'right-msb'; endif elseif (nargin == 3) if (ischar(n)) f = n; n = p p = 2; elseif (ischar(p)) f = p; p = 2; else f = 'right-msb'; endif elseif (nargin == 3) if (ischar(n)) tmp = f f = n; n = p p = tmp; elseif (ischar(p)) tmp = f; f = p; p = tmp; endif else error ("usage: b = de2bi (d [, n [, p]])"); endif d = d(:); if ( any (d < 0) || any (d != floor (d)) ) error ("de2bi: only handles non-negative integers"); endif power = ones (length (d), 1) * (p .^ [0 : n-1] ); d = d * ones (1, n); b = floor (rem (d, p*power) ./ power); if (strcmp(f,'left-msb')) b = b(:,columns(b):-1:1); elseif (!strcmp(f,'right-msb')) error("de2bi: unrecognized flag"); endif endfunction