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lo-mappers.cc
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1997-07-10
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/*
Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Modified by Klaus Gebhardt, 1997 */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cfloat>
#include "lo-error.h"
#include "lo-ieee.h"
#include "lo-mappers.h"
#include "lo-utils.h"
#include "oct-cmplx.h"
#include "oct-math.h"
#include "f77-fcn.h"
#if defined (_AIX) && defined (__GNUG__)
#undef finite
#define finite(x) ((x) < DBL_MAX && (x) > -DBL_MAX)
#endif
extern "C"
{
double F77_FCN (derf, DERF) (const double&);
double F77_FCN (derfc, DERFC) (const double&);
double F77_FCN (dgamma, DGAMMA) (const double&);
int F77_FCN (dlgams, DLGAMS) (const double&, double&, double&);
}
#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
#if defined (HAVE_ISNAN)
return xisnan (x) ? octave_NaN : 0.0;
#else
return 0.0;
#endif
}
double
conj (double x)
{
return x;
}
double
fix (double x)
{
return x > 0 ? floor (x) : ceil (x);
}
double
imag (double x)
{
#if defined (HAVE_ISNAN)
return xisnan (x) ? octave_NaN : 0.0;
#else
return 0.0;
#endif
}
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;
#if defined (HAVE_ISNAN)
return xisnan (x) ? octave_NaN : tmp;
#else
return tmp;
#endif
}
double
xerf (double x)
{
#if defined (HAVE_ERF)
return erf (x);
#else
double y;
F77_YXFCN (derf, DERF, y, (x));
return y;
#endif
}
double
xerfc (double x)
{
#if defined (HAVE_ERFC)
return erfc (x);
#else
double y;
F77_YXFCN (derfc, DERFC, y, (x));
return y;
#endif
}
double
xisnan (double x)
{
#if defined (HAVE_ISNAN)
return (double) (isnan (x) != 0);
#else
return 0;
#endif
}
double
xfinite (double x)
{
#if defined (HAVE_FINITE)
return (double) (finite (x) != 0);
#elif defined (HAVE_ISINF) && defined (HAVE_ISNAN)
return (double) (! isinf (x) && ! isnan (x));
#else
return 1;
#endif
}
double
xgamma (double x)
{
double y;
F77_YXFCN (dgamma, DGAMMA, y, (x));
return y;
}
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 0;
#endif
}
double
xlgamma (double x)
{
double result;
double sgngam;
F77_FCN (dlgams, DLGAMS) (x, result, sgngam);
return result;
}
// 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);
return (real (x) * imag (x) < 0.0) ? i * acosh (x) : -i * acosh (x);
}
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)
{
return Complex (fix (real (x)), fix (imag (x)));
}
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;
}
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/