Stephen, You don't really need one - since the nth root of x is the same as x raised to the 1/n power :)
So something akin to
if N <> 0 then
Y := Power (X, 1 / N);
Hth
Glenn Crouch, mailto:[EMAIL PROTECTED]
ESB Consultancy, http://www.esbconsult.com
Home of ESBPCS, ESB Calculators, ESBStats and ESBPDF Analysis
Kalgoorlie-Boulder, Western Australia
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