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

#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
0c9e74ab TL	1	#include "complex"
	2
	3	pow_zz(r,a,b)
	4	dcomplex r, a, *b;
	5	{
	6	double logr, logi, x, y;
	7	double log(), exp(), cos(), sin(), atan2(), cabs();
	8
	9	logr = log( cabs(a->dreal, a->dimag) );
	10	logi = atan2(a->dimag, a->dreal);
	11
	12	x = exp( logr * b->dreal - logi * b->dimag );
	13	y = logr * b->dimag + logi * b->dreal;
	14
	15	r->dreal = x * cos(y);
	16	r->dimag = x * sin(y);
	17	}