Mercurial > octave
view scripts/strings/dec2hex.m @ 31239:dd6b37f67db2
Accept negative inputs to -2^63 for dec2bin and dec2hex (bug #63089)
dec2bin.m: Accept negative inputs lower than -flintmax down to -2^63
Return 64-bit string in certain cases for Matlab compatibility
Activate BISTs commented out earlier
dec2hex.m: Remove repeated code and call dec2bin instead
Accept negative inputs lower than -flintmax down to -2^63
Update and activate BISTs commented out earlier
author | Arun Giridhar <arungiridhar@gmail.com> |
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date | Sun, 25 Sep 2022 06:22:25 -0400 |
parents | 5d3faba0342e |
children | 7018819318d1 |
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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 ## To avoid repeating a lot of code, including input validation, we call dec2bin. if (nargin == 2) d = dec2bin (d, len*4); else d = dec2bin (d); endif ## Left-pad with zeros to make the number of columns divisible by 4 n = mod (columns (d), 4); if (n > 0) d = [repmat("0", rows(d), 4-n), d]; endif d -= "0"; # convert to numeric d = d(:, 1:4:end) * 8 + d(:, 2:4:end) * 4 + d(:, 3:4:end) * 2 + d(:, 4:4:end); ## Elements of d are now in the range 0 to 15 hstr = "0123456789ABCDEF"(d+1); # convert to char and return 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") %!assert (dec2hex (-2^31 - 1), "FFFFFFFF7FFFFFFF") %!assert (dec2hex (-2^52), "FFF0000000000000") %!assert (dec2hex (-2^63), "8000000000000000") %!assert (dec2hex (int64 (-2) ^ 63), "8000000000000000") %!assert (dec2hex (int64 (-2) ^ 63 - 1), "8000000000000000") %!assert (dec2hex (int64 (-2) ^ 63 + 1), "8000000000000001") %!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 ()