/***********************************************************************
 * 
 *  LUSH Lisp Universal Shell
 *    Copyright (C) 2002 Leon Bottou, Yann Le Cun, AT&T Corp, NECI.
 *  Includes parts of TL3:
 *    Copyright (C) 1987-1999 Leon Bottou and Neuristique.
 *  Includes selected parts of SN3.2:
 *    Copyright (C) 1991-2001 AT&T Corp.
 * 
 *  This program 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 of the License, or
 *  (at your option) any later version.
 * 
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA
 * 
 ***********************************************************************/

/***********************************************************************
 * $Id: fltlib.h,v 1.2 2003/09/26 03:54:56 profshadoko Exp $
 **********************************************************************/

#ifndef FLTLIB_H
#define FLTLIB_H

#ifndef DEFINE_H
#include "define.h"
#endif

#ifdef __cplusplus
extern "C" { 
#ifndef __cplusplus
}
#endif
#endif

/* 'real' is the natural floating point type */
#define real double

/* 'flt' is a fast single precision floating point type */
#define flt  float

/* Constants */
#define Fzero 	((flt)0.0)
#define Fone	((flt)1.0)
#define Ftwo	((flt)2.0)
#define Fminus	((flt)-1.0)
#define Fhalf	((flt)0.5)
/* ... double precision */
#define Dzero 	((double)0.0)
#define Done	((double)1.0)
#define Dtwo	((double)2.0)
#define Dminus	((double)-1.0)
#define Dhalf	((double)0.5)

/* Compatibility */
#define Ftor(x) ((real)(x))
#define Ftod(x) ((double)(x))
#define rtoF(x) ((flt)(x))
#define dtoF(x) ((flt)(x))


/* Standard Math routines */
#define Fsqrt(x)	((flt)sqrt((double)x))
#define Finv(x)		((flt)(1.0/(double)x))
#define Fsin(x)		((flt)sin((double)x))
#define Fcos(x)		((flt)cos((double)x))
#define Ftan(x)		((flt)tan((double)x))
#define Fasin(x)	((flt)asin((double)x))
#define Facos(x)	((flt)acos((double)x))
#define Fatan(x)	((flt)atan((double)x))
#define Fexp(x)         ((flt)exp((double)x))
#define Fexpm1(x)       ((flt)expm1((double)x))
#define Flog(x)         ((flt)log((double)x))
#define Flog1p(x)       ((flt)log1p((double)x))
#define Fsinh(x)        ((flt)sinh((double)x))
#define Fcosh(x)        ((flt)cosh((double)x))
#define Ftanh(x)        ((flt)tanh((double)x))
#define Fatanh(x)       ((flt)atanh((double)x))
/* ... double precision */
#define Dsqrt(x)	((double)sqrt((double)x))
#define Dinv(x)		((double)(1.0/(double)x))
#define Dsin(x)		((double)sin((double)x))
#define Dcos(x)		((double)cos((double)x))
#define Dtan(x)		((double)tan((double)x))
#define Dasin(x)	((double)asin((double)x))
#define Dacos(x)	((double)acos((double)x))
#define Datan(x)	((double)atan((double)x))
#define Dexp(x)         ((double)exp((double)x))
#define Dexpm1(x)       ((double)expm1((double)x))
#define Dlog(x)         ((double)log((double)x))
#define Dlog1p(x)       ((double)log1p((double)x))
#define Dsinh(x)        ((double)sinh((double)x))
#define Dcosh(x)        ((double)cosh((double)x))
#define Dtanh(x)        ((double)tanh((double)x))
#define Datanh(x)       ((double)atanh((double)x))


/* Piecewise functions */
#define Ffloor(x)       ((flt)floor((double)x))
#define Fabs(x)         (((x)<Fzero)?-(x):(x))
#define Fsgn(x)         (((x)<Fzero)?Fminus:Fone)
#define Fpiece(x)       (((x)<Fminus)?Fminus:(((x)<Fone)?x:Fone))
#define Frect(x)        ((((x)>Fminus)&&((x)<Fone))?Fone:Fzero)
/* ... double precision */
#define Dfloor(x)       ((double)floor((double)x))
#define Dabs(x)         (((x)<Dzero)?-(x):(x))
#define Dsgn(x)         (((x)<Dzero)?Dminus:Done)
#define Dpiece(x)       (((x)<Dminus)?Dminus:(((x)<Done)?x:Done))
#define Drect(x)        ((((x)>Dminus)&&((x)<Done))?Done:Dzero)

/* Rational approximation of TANH, SIGMOIDS */
/* Declarations for EXP(-|X|), EXP(-X2)     */
LUSHAPI flt FQtanh(flt x);
LUSHAPI flt FQDtanh(flt x);
LUSHAPI flt FQstdsigmoid(flt x);
LUSHAPI flt FQDstdsigmoid(flt x);
LUSHAPI flt FQexpmx(flt x);
LUSHAPI flt FQDexpmx(flt x);
LUSHAPI flt FQexpmx2(flt x);
LUSHAPI flt FQDexpmx2(flt x);

/* Spline interpolation */
LUSHAPI void Fsplinit(int size, flt *parm);
LUSHAPI flt Fspline(flt x, int size, flt *parm);
LUSHAPI flt Fdspline(flt x, int size, flt *parm);

/* Random functions */
LUSHAPI flt Frand(void);
LUSHAPI flt Fgauss(void);
LUSHAPI void Fseed(int x);

/* Rational approximation of TANH, SIGMOIDS */
/* Declarations for EXP(-|X|), EXP(-X2)     */
LUSHAPI real DQtanh(real x);
LUSHAPI real DQDtanh(real x);
LUSHAPI real DQstdsigmoid(real x);
LUSHAPI real DQDstdsigmoid(real x);
LUSHAPI real DQexpmx(real x);
LUSHAPI real DQDexpmx(real x);
LUSHAPI real DQexpmx2(real x);
LUSHAPI real DQDexpmx2(real x);

/* Spline interpolation */
LUSHAPI void Dsplinit(int size, real *parm);
LUSHAPI real Dspline(real x, int size, real *parm);
LUSHAPI real Ddspline(real x, int size, real *parm);

/* Random functions */
LUSHAPI real Drand(void);
LUSHAPI real Dgauss(void);
LUSHAPI void Dseed(int x);


/* ------------------------------------------------------- */

#ifdef __cplusplus
}
#endif
#endif
