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mappers.cc
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1996-09-28
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// mappers.cc -*- C++ -*-
/*
Copyright (C) 1992, 1993 John W. Eaton
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, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <float.h>
#include <Complex.h>
#include "missing-math.h"
#include "variables.h"
#include "mappers.h"
#include "error.h"
#include "utils.h"
#include "defun.h"
#if defined (_AIX) && defined (__GNUG__)
#undef finite
#define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX)
#endif
#ifndef M_LOG10E
#define M_LOG10E 0.43429448190325182765
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#if defined (HAVE_LGAMMA) && ! defined (SIGNGAM_DECLARED)
extern int signgam;
#endif
// Double -> double mappers.
double
arg (double x)
{
if (x < 0.0)
return M_PI;
else
return 0.0;
}
double
conj (double x)
{
return x;
}
double
fix (double x)
{
int tmp;
tmp = (int) x;
return (double) tmp;
}
double
imag (double x)
{
return 0.0;
}
double
real (double x)
{
return x;
}
double
round (double x)
{
return D_NINT (x);
}
double
signum (double x)
{
double tmp = 0.0;
if (x < 0.0)
tmp = -1.0;
else if (x > 0.0)
tmp = 1.0;
return tmp;
}
double
xerf (double x)
{
#if defined (HAVE_ERF)
return erf (x);
#else
error ("erf(x) not available on this system");
#endif
}
double
xerfc (double x)
{
#if defined (HAVE_ERFC)
return erfc (x);
#else
error ("erfc(x) not available on this system");
#endif
}
double
xisnan (double x)
{
#if defined (HAVE_ISNAN)
return (double) isnan (x);
#else
return 0;
#endif
}
double
xfinite (double x)
{
#if defined (HAVE_FINITE)
return (double) finite (x);
#elif defined (HAVE_ISINF) && defined (HAVE_ISNAN)
return (double) (! isinf (x) && ! isnan (x));
#else
return (double) (x > -DBL_MAX && x < DBL_MAX);
#endif
}
double
xgamma (double x)
{
#if defined (HAVE_LGAMMA)
double y = lgamma (x);
return signgam * exp (y);
#else
error ("gamma(x) not available on this system");
#endif
}
double
xisinf (double x)
{
#if defined (HAVE_ISINF)
return (double) isinf (x);
#elif defined (HAVE_FINITE) && defined (HAVE_ISNAN)
return (double) (! (finite (x) || isnan (x)));
#else
return (double) (x == DBL_MAX || x == -DBL_MAX);
#endif
}
double
xlgamma (double x)
{
#if defined (HAVE_LGAMMA)
return lgamma (x);
#else
error ("lgamma (x) not available on this system");
#endif
}
// Complex -> double mappers.
double
xisnan (const Complex& x)
{
#if defined (HAVE_ISNAN)
double rx = real (x);
double ix = imag (x);
return (double) (isnan (rx) || isnan (ix));
#else
return 0;
#endif
}
double
xfinite (const Complex& x)
{
double rx = real (x);
double ix = imag (x);
return (double) (! ((int) xisinf (rx) || (int) xisinf (ix)));
}
double
xisinf (const Complex& x)
{
return (double) (! (int) xfinite (x));
}
// Complex -> complex mappers.
Complex
acos (const Complex& x)
{
static Complex i (0, 1);
Complex retval = -i * log (x + sqrt (x*x - 1.0));
return retval;
}
Complex
acosh (const Complex& x)
{
Complex retval = log (x + sqrt (x*x - 1.0));
return retval;
}
Complex
asin (const Complex& x)
{
static Complex i (0, 1);
Complex retval = -i * log (i*x + sqrt (1.0 - x*x));
return retval;
}
Complex
asinh (const Complex& x)
{
Complex retval = log (x + sqrt (x*x + 1.0));
return retval;
}
Complex
atan (const Complex& x)
{
static Complex i (0, 1);
Complex retval = i * log ((i + x) / (i - x)) / 2.0;
return retval;
}
Complex
atanh (const Complex& x)
{
static Complex i (0, 1);
Complex retval = log ((1 + x) / (1 - x)) / 2.0;
return retval;
}
Complex
ceil (const Complex& x)
{
int re = (int) ceil (real (x));
int im = (int) ceil (imag (x));
return Complex (re, im);
}
Complex
fix (const Complex& x)
{
int re = (int) real (x);
int im = (int) imag (x);
return Complex (re, im);
}
Complex
floor (const Complex& x)
{
int re = (int) floor (real (x));
int im = (int) floor (imag (x));
return Complex (re, im);
}
Complex
log10 (const Complex& x)
{
return M_LOG10E * log (x);
}
Complex
round (const Complex& x)
{
double re = D_NINT (real (x));
double im = D_NINT (imag (x));
return Complex (re, im);
}
Complex
signum (const Complex& x)
{
return x / abs (x);
}
Complex
tan (const Complex& x)
{
Complex retval = sin (x) / cos (x);
return retval;
}
Complex
tanh (const Complex& x)
{
Complex retval = sinh (x) / cosh (x);
return retval;
}
void
install_mapper_functions (void)
{
DEFUN_MAPPER ("abs", Sabs, 0, 0.0, 0.0, fabs, abs, 0,
"abs (X): compute abs (X) for each element of X");
DEFUN_MAPPER ("acos", Sacos, 1, -1.0, 1.0, acos, 0, acos,
"acos (X): compute acos (X) for each element of X");
DEFUN_MAPPER ("acosh", Sacosh, 1, 1.0, DBL_MAX, acosh, 0, acosh,
"acosh (X): compute acosh (X) for each element of X");
DEFUN_MAPPER ("angle", Sangle, 0, 0.0, 0.0, arg, arg, 0,
"angle (X): compute arg (X) for each element of X");
DEFUN_MAPPER ("arg", Sarg, 0, 0.0, 0.0, arg, arg, 0,
"arg (X): compute arg (X) for each element of X");
DEFUN_MAPPER ("asin", Sasin, 1, -1.0, 1.0, asin, 0, asin,
"asin (X): compute asin (X) for each element of X");
DEFUN_MAPPER ("asinh", Sasinh, 0, 0.0, 0.0, asinh, 0, asinh,
"asinh (X): compute asinh (X) for each element of X");
DEFUN_MAPPER ("atan", Satan, 0, 0.0, 0.0, atan, 0, atan,
"atan (X): compute atan (X) for each element of X");
DEFUN_MAPPER ("atanh", Satanh, 1, -1.0, 1.0, atanh, 0, atanh,
"atanh (X): compute atanh (X) for each element of X");
DEFUN_MAPPER ("ceil", Sceil, 0, 0.0, 0.0, ceil, 0, ceil,
"ceil (X): round elements of X toward +Inf");
DEFUN_MAPPER ("conj", Sconj, 0, 0.0, 0.0, conj, 0, conj,
"conj (X): compute complex conjugate for each element of X");
DEFUN_MAPPER ("cos", Scos, 0, 0.0, 0.0, cos, 0, cos,
"cos (X): compute cos (X) for each element of X");
DEFUN_MAPPER ("cosh", Scosh, 0, 0.0, 0.0, cosh, 0, cosh,
"cosh (X): compute cosh (X) for each element of X");
DEFUN_MAPPER ("erf", Serf, 0, 0.0, 0.0, xerf, 0, 0,
"erf (X): compute erf (X) for each element of X");
DEFUN_MAPPER ("erfc", Serfc, 0, 0.0, 0.0, xerfc, 0, 0,
"erfc (X): compute erfc (X) for each element of X");
DEFUN_MAPPER ("exp", Sexp, 0, 0.0, 0.0, exp, 0, exp,
"exp (X): compute exp (X) for each element of X");
DEFUN_MAPPER ("finite", Sfinite, 0, 0.0, 0.0, xfinite, xfinite, 0,
"finite (X): return 1 for finite elements of X");
DEFUN_MAPPER ("fix", Sfix, 0, 0.0, 0.0, fix, 0, fix,
"fix (X): round elements of X toward zero");
DEFUN_MAPPER ("floor", Sfloor, 0, 0.0, 0.0, floor, 0, floor,
"floor (X): round elements of X toward -Inf");
DEFUN_MAPPER ("gamma", Sgamma, 0, 0.0, 0.0, xgamma, 0, 0,
"gamma (X): compute gamma (X) for each element of X");
DEFUN_MAPPER ("isinf", Sisinf, 0, 0.0, 0.0, xisinf, xisinf, 0,
"isinf (X): return 1 for elements of X infinite");
DEFUN_MAPPER ("imag", Simag, 0, 0.0, 0.0, imag, imag, 0,
"imag (X): return imaginary part for each elements of X");
DEFUN_MAPPER ("isnan", Sisnan, 0, 0.0, 0.0, xisnan, xisnan, 0,
"isnan (X): return 1 where elements of X are NaNs");
DEFUN_MAPPER ("lgamma", Slgamma, 0, 0.0, 0.0, xlgamma, 0, 0,
"lgamma (X): compute log gamma (X) for each element of X");
DEFUN_MAPPER ("log", Slog, 1, 0.0, DBL_MAX, log, 0, log,
"log (X): compute log (X) for each element of X");
DEFUN_MAPPER ("log10", Slog10, 1, 0.0, DBL_MAX, log10, 0, log10,
"log10 (X): compute log10 (X) for each element of X");
DEFUN_MAPPER ("real", Sreal, 0, 0.0, 0.0, real, real, 0,
"real (X): return real part for each element of X");
DEFUN_MAPPER ("round", Sround, 0, 0.0, 0.0, round, 0, round,
"round (X): round elements of X to nearest integer");
DEFUN_MAPPER ("sign", Ssign, 0, 0.0, 0.0, signum, 0, signum,
"sign (X): apply signum function to elements of X");
DEFUN_MAPPER ("sin", Ssin, 0, 0.0, 0.0, sin, 0, sin,
"sin (X): compute sin (X) for each element of X");
DEFUN_MAPPER ("sinh", Ssinh, 0, 0.0, 0.0, sinh, 0, sinh,
"sinh (X): compute sinh (X) for each element of X");
DEFUN_MAPPER ("sqrt", Ssqrt, 1, 0.0, DBL_MAX, sqrt, 0, sqrt,
"sqrt (X): compute sqrt (X) for each element of X");
DEFUN_MAPPER ("tan", Stan, 0, 0.0, 0.0, tan, 0, tan,
"tan (X): compute tan (X) for each element of X");
DEFUN_MAPPER ("tanh", Stanh, 0, 0.0, 0.0, tanh, 0, tanh,
"tanh (X): compute tanh (X) for each element of X");
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; page-delimiter: "^/\\*" ***
;;; End: ***
*/