Mercurial > octave
view scripts/strings/dec2hex.m @ 31221:f5755dbacd8d
maint: merge stable to default
author | Pantxo Diribarne <pantxo.diribarne@gmail.com> |
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date | Wed, 31 Aug 2022 22:04:02 +0200 |
parents | 5d3faba0342e |
children | dd6b37f67db2 |
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######################################################################## ## ## Copyright (C) 1996-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 3 of the License, 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, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{hstr} =} dec2hex (@var{d}) ## @deftypefnx {} {@var{hstr} =} dec2hex (@var{d}, @var{len}) ## Return a string representing the conversion of the integer @var{d} to a ## hexadecimal (base16) number. ## ## If @var{d} is negative, return the hexadecimal equivalent of the two's ## complement binary value of @var{d}. ## If @var{d} is a matrix or cell array, return a string matrix with one row ## for each element in @var{d}, padded with leading zeros to the width of the ## largest value. ## ## The optional second argument, @var{len}, specifies the minimum number of ## digits in the result. ## ## Examples: ## ## @example ## @group ## dec2hex (2748) ## @result{} "ABC" ## ## dec2hex (-2) ## @result{} "FE" ## @end group ## @end example ## ## @seealso{hex2dec, dec2base, dec2bin} ## @end deftypefn function hstr = dec2hex (d, len) if (nargin == 0) print_usage (); endif if (iscell (d)) d = cell2mat (d); endif ## Create column vector for algorithm (output is always col. vector anyways) d = d(:); lt_zero_idx = (d < 0); if (any (lt_zero_idx)) ## FIXME: Need an algorithm that works with larger values such as int64. if (any (d(lt_zero_idx) < -2^52)) error ("dec2hex: negative inputs cannot be less than -flintmax () / 2"); elseif (any (d(lt_zero_idx) < intmin ("int32"))) d(lt_zero_idx) += flintmax (); elseif (any (d < intmin ("int16"))) d(lt_zero_idx) += double (intmax ("uint32")) + 1; elseif (any (d < intmin ("int8"))) d(lt_zero_idx) += double (intmax ("uint16"))+ 1; else d(lt_zero_idx) += double (intmax ("uint8")) + 1; endif endif if (nargin == 1) hstr = dec2base (d, 16); else hstr = dec2base (d, 16, len); endif endfunction %!assert (dec2hex (2748), "ABC") %!assert (dec2hex (2748, 5), "00ABC") %!assert (dec2hex ([2748, 2746]), ["ABC"; "ABA"]) %!assert (dec2hex ({2748, 2746}), ["ABC"; "ABA"]) %!assert (dec2hex ({2748, 2746}, 4), ["0ABC"; "0ABA"]) ## Test negative inputs %!assert (dec2hex (-3), "FD") %!assert (dec2hex (-3, 1), "FD") %!assert (dec2hex (-3, 3), "0FD") %!assert (dec2hex (-2^7 -1), "FF7F") %!assert (dec2hex (-2^15 -1), "FFFF7FFF") ## FIXME: Matlab returns longer string that begins with 'F' %!assert (dec2hex (-2^31 -1), "1FFFFF7FFFFFFF") ## FIXME: Matlab returns longer string that begins with 'FFF' %!assert (dec2hex (-2^52), "10000000000000") ## FIXME: Uncomment when support for int64 is added %!#assert (dec2hex (-2^63), %! "1000000000000000000000000000000000000000000000000000000000000000") %!#test %! assert (dec2hex (int64 (-2^63)), %! "1000000000000000000000000000000000000000000000000000000000000000"); %!#test %! assert (dec2hex (int64 (-2^63) -1), %! "1000000000000000000000000000000000000000000000000000000000000000"); %!#test %! assert (dec2hex (int64 (-2^63) +1), %! "1000000000000000000000000000000000000000000000000000000000000001"); %!assert (dec2hex ([-1, -2; -3, -4]), ["FF"; "FD"; "FE"; "FC"]) %!assert (dec2hex ([1, 2; 3, -4]), ["01"; "03"; "02"; "FC"]) %!assert (dec2hex ({1, 2; 3, -4}), ["01"; "03"; "02"; "FC"]) ## Test input validation %!error <Invalid call> dec2hex () %!error <negative inputs cannot be less than> dec2hex (- flintmax ())