Mercurial > hg > octave-lyh
diff scripts/strings/dec2base.m @ 3789:2a257be5e488
[project @ 2001-02-09 04:12:30 by jwe]
author | jwe |
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date | Fri, 09 Feb 2001 04:12:31 +0000 |
parents | |
children | c1c532a0acb2 |
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new file mode 100644 --- /dev/null +++ b/scripts/strings/dec2base.m @@ -0,0 +1,84 @@ +## Copyright (C) 2000 Daniel Calvelo +## +## This file is part of Octave. +## +## Octave 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, or (at your option) +## any later version. +## +## Octave 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 Octave; see the file COPYING. If not, write to the Free +## Software Foundation, 59 Temple Place - Suite 330, Boston, MA +## 02111-1307, USA. + +## -*- texinfo -*- +## @deftypefn {Function File} {} dec2base (@var{n}, @var{b}) +## Return a string of symbols in base @var{b} corresponding to the +## the nonnegative integer @var{n}. +## +## @example +## dec2base (123, 3) +## @result{} "11120" +## @end example +## +## If @var{n} is a vector, return a string matrix with one row per value, +## padded with leading zeros to the width of the largest value. +## +## If @var{b} is a string then the characters of @var{b} are used as +## the symbols for the digits of @var{n}. Space (' ') may not be used +## as a symbol. +## +## @example +## dec2base (123, "aei") +## @result{} "eeeia" +## @end example +## @end deftypefn +## +## @seealso{base2dec, dec2bin, bin2dec, hex2dec, dec2hex} + +## Author: Daniel Calvelo <> +## Adapted-by: Paul Kienzle <pkienzle@kienzle.powernet.co.uk> + +function out = dec2base (d, base) + + if (nargin != 2) + usage("dec2base (n, base)"); + endif + + if (prod (size (d)) != length (d)) + error("dec2base: cannot convert matrices."); + elseif (any (d < 0 | d != fix (d))) + error("dec2base: can only convert non-negative integers.") + endif + + symbols = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + if (isstr (base)) + symbols = base; + base = length (symbols); + if any (diff (sort (toascii (symbols))) == 0) + error ("dec2base: symbols representing digits must be unique."); + endif + elseif (! is_scalar (base)) + error ("dec2base: cannot convert from several bases at once."); + elseif (base < 2 || base > length (symbols)) + error ("dec2base: base must be between 2 and 36 or a string of symbols"); + endif + + ## determine number of digits required to handle all numbers + maxLen = floor (log (max (max (d), 1)) ./ log (base)) + 1; + + ## determine digits for each number + power = ones (length (d), 1) * (base .^ (maxLen-1 : -1 : 0)); + d = d(:) * ones (1, maxLen); + digits = floor (rem (d, base*power) ./ power); + + ## convert digits to symbols + out = reshape (symbols (digits+1), size (digits)); + +endfunction