linux: 
$ perl -le'print -3 ** (1/3)'
-1.44224957030741

[download]
ActivePerl: 
>perl -le"print -3 ** (1/3)"
-1.44224957030741

[download]

Update: Oops, precedence problem 

$ perl -le'print( (-3) ** (1/3) )'
nan

[download]
>perl -e"print( (-3) ** (1/3) )"
-1.#IND

[download]

In reply to Re^2: root function by ikegami
in thread root function by Anonymous Monk

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