Mercurial > octave-nkf
view src/DLD-FUNCTIONS/typecast.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 | 954b6f69f51d |
children | eb63fbe60fab |
line wrap: on
line source
/* Copyright (C) 2007 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 <string> #include "oct.h" template <class LT, class RT> /* static */ void typecast (const Array<RT>& x, Array<LT>& y) { octave_idx_type n = x.length (); size_t ns = sizeof (RT); size_t ms = sizeof (LT); if (n * ns % ms != 0) error ("typecast: incorrect number of input values to make output value"); else { octave_idx_type m = n * ns / ms; dim_vector dv = x.dims (); for (octave_idx_type i = 0; i < dv.length(); i++) if (dv(i) == n) { dv(i) = m; break; } y.resize (dv); const unsigned char *xp = reinterpret_cast<const unsigned char *> (x.fortran_vec ()); unsigned char *yp = reinterpret_cast<unsigned char *>(y.fortran_vec ()); for (octave_idx_type i = 0; i < n * static_cast<octave_idx_type>(ns); i++) *yp++ = *xp++; } } template <class T> static octave_value typecast (const T& x, std::string type) { octave_value retval; if (type == "uint8") { uint8NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "uint16") { uint16NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "uint32") { uint32NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "uint64") { uint64NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "int8") { int8NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "int16") { int16NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "int32") { int32NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "int64") { int64NDArray y; typecast (x, y); retval = octave_value (y); } else if (type == "single") { FloatNDArray y; typecast (x, y); retval = octave_value (y); } else { NDArray y; typecast (x, y); retval = octave_value (y); } return retval; } DEFUN_DLD (typecast, args, , "-*- texinfo -*-\n\ @deftypefn {Loadable Function} {} typecast (@var{x}, @var{type})\n\ Convert from one datatype to another without changing the underlying\n\ data. The argument @var{type} defines the type of the return argument\n\ and must be one of 'uint8', 'uint16', 'uint32', 'uint64', 'int8', 'int16',\n\ 'int32', 'int64', 'single' or 'double'.\n\ \n\ An example of the use of typecast on a little-endian machine is\n\ \n\ @example\n\ @group\n\ @var{x} = uint16 ([1, 65535]);\n\ typecast (@var{x}, 'uint8')\n\ @result{} [ 0, 1, 255, 255]\n\ @end group\n\ @end example\n\ @seealso{cast, swapbytes}\n\ @end deftypefn") { int nargin = args.length (); octave_value retval; if (nargin != 2) print_usage (); else { std::string type = args (1).string_value (); if (! error_state) { std::transform (type.begin (), type.end (), type.begin (), tolower); if (type != "uint8" && type != "uint16" && type != "uint32" && type != "uint64" && type != "int8" && type != "int16" && type != "int32" && type != "int64" && type != "single" && type != "double") error ("typecast: unrecognized or invalid type"); else if (args(0).is_sparse_type () || args(0).is_complex_type ()) error ("typecast: sparse and complex types are invalid"); else { dim_vector dv = args(0).dims (); bool seen = false; for (octave_idx_type i = 0; i < dv.length(); i++) if (dv (i) != 1) { if (seen) { error ("typecast: argument must be a vector"); break; } else seen = true; } if (!error_state) { if (args(0).is_uint8_type ()) retval = typecast (args(0).uint8_array_value (), type); else if (args(0).is_uint16_type ()) retval = typecast (args(0).uint16_array_value (), type); else if (args(0).is_uint32_type ()) retval = typecast (args(0).uint32_array_value (), type); else if (args(0).is_uint64_type ()) retval = typecast (args(0).uint64_array_value (), type); else if (args(0).is_int8_type ()) retval = typecast (args(0).int8_array_value (), type); else if (args(0).is_int16_type ()) retval = typecast (args(0).int16_array_value (), type); else if (args(0).is_int32_type ()) retval = typecast (args(0).int32_array_value (), type); else if (args(0).is_int64_type ()) retval = typecast (args(0).int64_array_value (), type); else if (args(0).is_single_type ()) retval = typecast (args(0).float_array_value (), type); else retval = typecast (args(0).array_value (), type); } } } } return retval; }