Root
From NARS2000


R is a numeric array.  
Z is a floating point array whose values are the square root of the elements of R. 


L and R are numeric arrays.  
Z is a floating point array whose values are the L^{th} root of the elements of R. 
For example,
√⍳4 1 1.414213562 1.732050808 2 (3√⍳4)*3 1 2 3 4
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