contrib/libf2c/libF77/z_log.c

   1 #include "f2c.h"
   2
   3 #ifdef KR_headers
   4 double log(), f__cabs(), atan2();
   5 VOID z_log(r, z) doublecomplex *r, *z;
   6 #else
   7 #undef abs
   8 #include "math.h"
   9 extern double f__cabs(double, double);
  10 void z_log(doublecomplex *r, doublecomplex *z)
  11 #endif
  12 {
  13         double zi = z->i, zr = z->r;
  14         r->i = atan2(zi, zr);
  15         r->r = log( f__cabs( zr, zi ) );
  16         }