A Tour of Go : Advanced Exercise: Complex cube roots

A Tour of Go系列。如有问题欢迎指出~

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这个也没什么好说的，就是试一下内建的复数运算。

Let's explore Go's built-in support for complex numbers via thecomplex64 and complex128 types. For cube roots, Newton's method amounts to repeating:

Find the cube root of 2, just to make sure the algorithm works. There is aPow function in the math/cmplx package.

代码:

 1 package main
 2 
 3 import (
 4     "fmt"
 5     "math/cmplx"
 6 )
 7 
 8 func Cbrt(x complex128) complex128 {
 9     z:=complex128(1)
10     for i:=0;i<10;i++{
11         z=z-(z*z*z-x)/(3*z*z)
12     }
13     return z
14 }
15 
16 func main() {
17     fmt.Println(Cbrt(2))
18     fmt.Println(cmplx.Pow(2,1.0/3))
19 }

将输出：

(1.2599210498948732+0i)
(1.259921049894873+0i)

注意一下cmplx.Pow的用法。

 

转载于:https://www.cnblogs.com/so-what/archive/2012/10/11/2720574.html