[unix-history] / usr / src / usr.bin / f77 / libF77 / pow_zz.c

/*
 *	"@(#)pow_zz.c	1.1"
 */

#include "complex"

pow_zz(r,a,b)
dcomplex *r, *a, *b;
{
double logr, logi, x, y;
double log(), exp(), cos(), sin(), atan2(), cabs();

logr = log( cabs(a->dreal, a->dimag) );
logi = atan2(a->dimag, a->dreal);

x = exp( logr * b->dreal - logi * b->dimag );
y = logr * b->dimag + logi * b->dreal;

r->dreal = x * cos(y);
r->dimag = x * sin(y);
}
Commit	Line	Data
595ea330 DW	1	/*
	2	* "@(#)pow_zz.c 1.1"
	3	*/
	4
	5	#include "complex"
	6
	7	pow_zz(r,a,b)
	8	dcomplex r, a, *b;
	9	{
	10	double logr, logi, x, y;
	11	double log(), exp(), cos(), sin(), atan2(), cabs();
	12
	13	logr = log( cabs(a->dreal, a->dimag) );
	14	logi = atan2(a->dimag, a->dreal);
	15
	16	x = exp( logr * b->dreal - logi * b->dimag );
	17	y = logr * b->dimag + logi * b->dreal;
	18
	19	r->dreal = x * cos(y);
	20	r->dimag = x * sin(y);
	21	}