/*! @file slu_scomplex.h

 * \brief Header file for complex operations

 * 
 

 *  -- SuperLU routine (version 2.0) --

 * Univ. of California Berkeley, Xerox Palo Alto Research Center,

 * and Lawrence Berkeley National Lab.

 * November 15, 1997

 *

 * Contains definitions for various complex operations.

 * This header file is to be included in source files c*.c

 * 

 */

#ifndef __SUPERLU_SCOMPLEX /* allow multiple inclusions */

#define __SUPERLU_SCOMPLEX

#ifndef SCOMPLEX_INCLUDE

#define SCOMPLEX_INCLUDE

typedef struct { float r, i; } complex;

/* Macro definitions */

/*! \brief Complex Addition c = a + b */

#define c_add(c, a, b) { (c)->r = (a)->r + (b)->r; \

			 (c)->i = (a)->i + (b)->i; }

/*! \brief Complex Subtraction c = a - b */

#define c_sub(c, a, b) { (c)->r = (a)->r - (b)->r; \

			 (c)->i = (a)->i - (b)->i; }

/*! \brief Complex-Double Multiplication */

#define cs_mult(c, a, b) { (c)->r = (a)->r * (b); \

                           (c)->i = (a)->i * (b); }

/*! \brief Complex-Complex Multiplication */

#define cc_mult(c, a, b) { \

	float 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; \

    }

#define cc_conj(a, b) { \

        (a)->r = (b)->r; \

        (a)->i = -((b)->i); \

    }

/*! \brief Complex equality testing */

#define c_eq(a, b)  ( (a)->r == (b)->r && (a)->i == (b)->i )

#ifdef __cplusplus

extern "C" {

#endif

/* Prototypes for functions in scomplex.c */

void c_div(complex *, complex *, complex *);

double c_abs(complex *);     /* exact */

double c_abs1(complex *);    /* approximate */

void c_exp(complex *, complex *);

void r_cnjg(complex *, complex *);

double r_imag(complex *);

complex c_sgn(complex *);

complex c_sqrt(complex *);

#ifdef __cplusplus

  }

#endif

#endif

#endif  /* __SUPERLU_SCOMPLEX */