freebsd-dev/contrib/libf2c/libF77/pow_zz.c

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1999-09-18 10:51:31 +00:00
#include "f2c.h"
#ifdef KR_headers
double log(), exp(), cos(), sin(), atan2(), f__cabs();
VOID pow_zz(r,a,b) doublecomplex *r, *a, *b;
#else
#undef abs
#include <math.h>
extern double f__cabs(double,double);
void pow_zz(doublecomplex *r, doublecomplex *a, doublecomplex *b)
#endif
{
double logr, logi, x, y;
logr = log( f__cabs(a->r, a->i) );
logi = atan2(a->i, a->r);
x = exp( logr * b->r - logi * b->i );
y = logr * b->i + logi * b->r;
r->r = x * cos(y);
r->i = x * sin(y);
}