[R] cube root of a negative number

[sachinthaka.abeywardana at allianz.com.au]

hmm interesting. When I did -4^(1/3) got the correct answer, but then again
that's because it processes the negative later. i.e. -4^(1/2) gave me -2
instead of the 2i I expected. Also when I did (-4+0i)^(1/3) it gave me
0.793701+1.37473i. Possible bug?

Sachin

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