dcomplex.h

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/* $Id: dcomplex.h,v 1.2 2000/08/19 23:32:38 garloff Exp $ */


/*
 * -- SuperLU routine (version 1.1) --
 * Univ. of California Berkeley, Xerox Palo Alto Research Center,
 * and Lawrence Berkeley National Lab.
 * November 15, 1997
 *
 */
#ifndef __SUPERLU_DCOMPLEX /* allow multiple inclusions */
#define __SUPERLU_DCOMPLEX

/* 
 * This header file is to be included in source files z*.c
 */
#ifndef DCOMPLEX_INCLUDE
#define DCOMPLEX_INCLUDE

typedef struct { double r, i; } doublecomplex;


/* Macro definitions */

/* Complex Addition c = a + b */
#define z_add(c, a, b) { (c)->r = (a)->r + (b)->r; \
                         (c)->i = (a)->i + (b)->i; }

/* Complex Subtraction c = a - b */
#define z_sub(c, a, b) { (c)->r = (a)->r - (b)->r; \
                         (c)->i = (a)->i - (b)->i; }

/* Complex-Double Multiplication */
#define zd_mult(c, a, b) { (c)->r = (a)->r * (b); \
                           (c)->i = (a)->i * (b); }

/* Complex-Complex Multiplication */
#define zz_mult(c, a, b) { \
        double cr, ci; \
        cr = (a)->r * (b)->r - (a)->i * (b)->i; \
        ci = (a)->i * (b)->r + (a)->r * (b)->i; \
        (c)->r = cr; \
        (c)->i = ci; \
    }

/* Complex equality testing */
#define z_eq(a, b)  ( (a)->r == (b)->r && (a)->i == (b)->i )


#ifdef __cplusplus
extern "C" {
#endif

/* Prototypes for functions in dcomplex.c */
void z_div(doublecomplex *, doublecomplex *, doublecomplex *);
double z_abs(doublecomplex *);     /* exact */
double z_abs1(doublecomplex *);    /* approximate */
void z_exp(doublecomplex *, doublecomplex *);
void d_cnjg(doublecomplex *r, doublecomplex *z);
double d_imag(doublecomplex *);


#ifdef __cplusplus
  }
#endif

#endif

#endif  /* __SUPERLU_DCOMPLEX */

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