[R] cube root

From: Branimir K. Hackenberger <hack_at_biologija.unios.hr>
Date: Sun, 17 Apr 2011 07:51:21 +0200


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?)  

Thx!!!    

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