如何在F#中获得多维数据集根 [英] How can I get the cube root in F#

问题描述

我试图在F#中获得多维数据集根.但这是我的问题.

I tried to get the cube root in F#. But here is my problem.

let x5 = ((float 64) ** (1.0/3.0));;
val x5 : float = 4.0

int x5;; //expected 4
val it : int = 3

结果应为4，而不是3.

The result should be 4, not 3.

怎么了?

推荐答案

没什么错，问题是x5的值比4.0 小. 您可能会清楚地看到使用fsi可以节省多少:

Nothing is wrong, the thing is that the value of your x5 is a bit less, than 4.0. You may explicitly see how much less using fsi:

let x5 = ((float 64) ** (1.0/3.0))
let err = 4.0 - x5;;

val x5 : float = 4.0
val err : float = 4.440892099e-16

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