[R] cube root

[Sascha Vieweg]

On 11-04-17 07:51, Branimir K. Hackenberger wrote:

> This is some interesting:
>
>> -8^(1/3)
>
> [1] -2
>
>> x=(-8:8)
>
>> y=x^(1/3)
>
>> y
>
> [1]      NaN      NaN      NaN      NaN      NaN      NaN      NaN      NaN
> 0.000000 1.000000
>
> [11] 1.259921 1.442250 1.587401 1.709976 1.817121 1.912931 2.000000
>
> So, can anybody explain this?! (Why is x[1]^(1/3)=y[1]=NaN, but
> -8^(1/3)=-2?)

-8^(1/3) == (-8)^(1/3) # NA
-8^(1/3) == -(8^(1/3)) # TRUE

> Thx!!!

You're welcome.

-- 
Sascha Vieweg, saschaview at gmail.com