Mercurial > octave-nkf
view src/DLD-FUNCTIONS/hex2num.cc @ 8828:8463d1a2e544
Doc fixes.
* 2]$$. => 2].$$
* @var{extrapval} => @var{extrapval}.
* call helloworld.oct => called @file{helloworld.oct}
* @itemize => @table @code
* shows. => shows:
* save => @code{save}
* @ref{Breakpoints} => @pxref{Breakpoints}
* add @noindent following example
* which is computed => and compute it
* clarify wording
* remove comma
* good => well
* set => number
* by writing => with the command
* has the option of directly calling => can call
* [-like-] {+of the right size,+}
* solvers => routines
* handle => test for
* add introductory section
* add following
* {+the+} [0..bitmax] => [0,bitmax]
* of the => with
* number => value
* add usual
* Besides when doing comparisons, logical => Logical {+also+}
* array comparison => array, comparisons
* param => parameter
* works very similar => is similar
* strings, => strings
* most simple => simplest
* easier => more easily
* like => as
* called => called,
* clarify wording
* you should simply type => use
* clarify wording
* means => way
* equally => also
* [-way much-] {+way+}
* add with mean value parameter given by the first argument, @var{l}
* add Functions described as @dfn{mapping functions} apply the given
operation to each element when given a matrix argument.
* in this brief introduction => here
* It is worth noticing => Note
* add following
* means => ways
author | Brian Gough <bjg@network-theory.co.uk> |
---|---|
date | Fri, 20 Feb 2009 11:17:01 -0500 |
parents | d724487d2c4b |
children | eb63fbe60fab |
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/* Copyright (C) 2008 David Bateman 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 <http://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <algorithm> #include "defun-dld.h" #include "error.h" #include "gripes.h" #include "oct-obj.h" #include "utils.h" DEFUN_DLD (hex2num, args, , "-*- texinfo -*-\n\ @deftypefn {Loadable Function} {@var{n} =} hex2num (@var{s})\n\ Typecast the 16 character hexadecimal character matrix to an IEEE 754\n\ double precision number. If fewer than 16 characters are given the\n\ strings are right padded with '0' characters.\n\ \n\ Given a string matrix, @code{hex2num} treats each row as a separate\n\ number.\n\ \n\ @example\n\ hex2num ([\"4005bf0a8b145769\";\"4024000000000000\"])\n\ @result{} [2.7183; 10.000]\n\ @end example\n\ @seealso{num2hex, hex2dec, dec2hex}\n\ @end deftypefn") { int nargin = args.length (); octave_value retval; if (nargin != 1) print_usage (); else { const charMatrix cmat = args(0).char_matrix_value (); if (cmat.columns () > 16) error ("hex2num: expecting no more than a 16 character string"); else if (! error_state) { octave_idx_type nr = cmat.rows (); octave_idx_type nc = cmat.columns (); ColumnVector m (nr); for (octave_idx_type i = 0; i < nr; i++) { union { uint64_t ival; double dval; } num; for (octave_idx_type j = 0; j < nc; j++) { unsigned char ch = cmat.elem (i, j); if (isxdigit (ch)) { num.ival <<= 4; if (ch >= 'a') num.ival += static_cast<uint64_t> (ch - 'a' + 10); else if (ch >= 'A') num.ival += static_cast<uint64_t> (ch - 'A' + 10); else num.ival += static_cast<uint64_t> (ch - '0'); } else { error ("hex2num: illegal character found in string"); break; } } if (error_state) break; else { if (nc < 16) num.ival <<= (16 - nc) * 4; m(i) = num.dval; } } if (! error_state) retval = m; } } return retval; } /* %!assert (hex2num(['c00';'bff';'000';'3ff';'400']),[-2:2]') */ DEFUN_DLD (num2hex, args, , "-*- texinfo -*-\n\ @deftypefn {Loadable Function} {@var{s} =} num2hex (@var{n})\n\ Typecast a double precision number or vector to a 16 character hexadecimal\n\ string of the IEEE 754 representation of the number. For example\n\ \n\ @example\n\ num2hex ([-1, 1, e, Inf, NaN, NA]);\n\ @result{} \"bff0000000000000\n\ 3ff0000000000000\n\ 4005bf0a8b145769\n\ 7ff0000000000000\n\ fff8000000000000\n\ 7ff00000000007a2\"\n\ @end example\n\ @seealso{hex2num, hex2dec, dec2hex}\n\ @end deftypefn") { int nargin = args.length (); octave_value retval; if (nargin != 1) print_usage (); else { const ColumnVector v (args(0).vector_value ()); if (! error_state) { octave_idx_type nr = v.length (); charMatrix m (nr, 16); const double *pv = v.fortran_vec (); for (octave_idx_type i = 0; i < nr; i++) { union { uint64_t ival; double dval; } num; num.dval = *pv++; for (octave_idx_type j = 0; j < 16; j++) { unsigned char ch = static_cast<char> (num.ival >> ((15 - j) * 4) & 0xF); if (ch >= 10) ch += 'a' - 10; else ch += '0'; m.elem (i, j) = ch; } } retval = octave_value (m, true); } } return retval; } /* %!assert (num2hex (-2:2),['c000000000000000';'bff0000000000000';'0000000000000000';'3ff0000000000000';'4000000000000000']) */