gsl_complex.h

一个复数运算的例子

/* complex/gsl_complex.h
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman, Brian Gough
 * 
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __GSL_COMPLEX_H__
#define __GSL_COMPLEX_H__

#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif

__BEGIN_DECLS


/* two consecutive built-in types as a complex number */
typedef double *       gsl_complex_packed ;
typedef float *        gsl_complex_packed_float  ;
typedef long double *  gsl_complex_packed_long_double ;

typedef const double *       gsl_const_complex_packed ;
typedef const float *        gsl_const_complex_packed_float  ;
typedef const long double *  gsl_const_complex_packed_long_double ;


/* 2N consecutive built-in types as N complex numbers */
typedef double *       gsl_complex_packed_array ;
typedef float *        gsl_complex_packed_array_float  ;
typedef long double *  gsl_complex_packed_array_long_double ;

typedef const double *       gsl_const_complex_packed_array ;
typedef const float *        gsl_const_complex_packed_array_float  ;
typedef const long double *  gsl_const_complex_packed_array_long_double ;


/* Yes... this seems weird. Trust us. The point is just that
   sometimes you want to make it obvious that something is
   an output value. The fact that it lacks a 'const' may not
   be enough of a clue for people in some contexts.
 */
typedef double *       gsl_complex_packed_ptr ;
typedef float *        gsl_complex_packed_float_ptr  ;
typedef long double *  gsl_complex_packed_long_double_ptr ;

typedef const double *       gsl_const_complex_packed_ptr ;
typedef const float *        gsl_const_complex_packed_float_ptr  ;
typedef const long double *  gsl_const_complex_packed_long_double_ptr ;


typedef struct
  {
    long double dat[2];
  }
gsl_complex_long_double;

typedef struct
  {
    double dat[2];
  }
gsl_complex;

typedef struct
  {
    float dat[2];
  }
gsl_complex_float;

#define GSL_REAL(z)     ((z).dat[0])
#define GSL_IMAG(z)     ((z).dat[1])
#define GSL_COMPLEX_P(zp) ((zp)->dat)
#define GSL_COMPLEX_P_REAL(zp)  ((zp)->dat[0])
#define GSL_COMPLEX_P_IMAG(zp)  ((zp)->dat[1])
#define GSL_COMPLEX_EQ(z1,z2) (((z1).dat[0] == (z2).dat[0]) && ((z1).dat[1] == (z2).dat[1]))

#define GSL_SET_COMPLEX(zp,x,y) do {(zp)->dat[0]=(x); (zp)->dat[1]=(y);} while(0)
#define GSL_SET_REAL(zp,x) do {(zp)->dat[0]=(x);} while(0)
#define GSL_SET_IMAG(zp,y) do {(zp)->dat[1]=(y);} while(0)

#define GSL_SET_COMPLEX_PACKED(zp,n,x,y) do {*((zp)+2*(n))=(x); *((zp)+(2*(n)+1))=(y);} while(0)

__END_DECLS

#endif /* __GSL_COMPLEX_H__ */