1 #include <u.h> 2 #include <libc.h> 3 #include "map.h" 4 5 void 6 ccubrt(double zr, double zi, double *wr, double *wi) 7 { 8 double r, theta; 9 theta = atan2(zi,zr); 10 r = cubrt(hypot(zr,zi)); 11 *wr = r*cos(theta/3); 12 *wi = r*sin(theta/3); 13 } 14