| 1 | #include "f2c.h" |
| 2 | |
| 3 | #ifdef KR_headers |
| 4 | double log(), exp(), cos(), sin(), atan2(), f__cabs(); |
| 5 | VOID pow_zz(r,a,b) doublecomplex *r, *a, *b; |
| 6 | #else |
| 7 | #undef abs |
| 8 | #include "math.h" |
| 9 | extern double f__cabs(double,double); |
| 10 | void pow_zz(doublecomplex *r, doublecomplex *a, doublecomplex *b) |
| 11 | #endif |
| 12 | { |
| 13 | double logr, logi, x, y; |
| 14 | |
| 15 | logr = log( f__cabs(a->r, a->i) ); |
| 16 | logi = atan2(a->i, a->r); |
| 17 | |
| 18 | x = exp( logr * b->r - logi * b->i ); |
| 19 | y = logr * b->i + logi * b->r; |
| 20 | |
| 21 | r->r = x * cos(y); |
| 22 | r->i = x * sin(y); |
| 23 | } |