Hi,
I want to apply ^ operator to a vector but it is applied to some of the 
elements correctly and to some others, it generates NaN. Why is it not able to 
calculate -6.108576e-05^(1/3) even though it exists?


 tmp
[1] -6.108576e-05  4.208762e-05  3.547092e-05  7.171101e-04 -1.600269e-03
> tmp^(1/3)
[1]        NaN 0.03478442 0.03285672 0.08950802        NaN
> -6.108576e-05^(1/3)
[1] -0.03938341

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