Cube root example in GoLang tour #47

golang-tour-47.go

package main

import "fmt"
import "math/cmplx"

func Cbrt(x complex128) complex128 {
	z:=complex128(1.0)
        min_delta := float64(0.00000000001)
        delta := complex128(1.0)
        var iter int
        for iter = 0; cmplx.Abs(delta) > min_delta ; iter++{
                delta = (z*z*z - x)/(3*z*z)
                //fmt.Println(z,delta)
                z = z - delta
        }
        fmt.Println("iterations: ", iter)
        return z

}

func main() {
	var val complex128 = 123123; 
	fmt.Println(Cbrt(val))
	fmt.Println(cmplx.Pow(val,1.0/3.0))
	
}