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C/C++ Source or Header  |  1995-01-28  |  482b  |  24 lines
  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. }
  24.