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 }