Actually, I want to extract the negative root, but I take it the issues are
the same.
> -----Original Message-----
>From: P.J.Wells
>Sent: 19 September 2001 18:56
>To: 'S-plus list'
>Subject: roots of negative numbers
>
>How can I get S-Plus to do (something like) the following?
>
>#take a negative number
>
>>test_ -x
>
>#take its square root
>
>>root.test_test^(1/n)
>
>#get positive root
>
>>root.test
>>-[x^(1/n)]
>
>#e.g.
>
>>test_ -9
>>root.test_test^(1/2)
>>root.test
>>-3
>
>Julian Wells
>OU Business School
>The Open University
>Walton Hall
>Milton Keynes
>MK7 6AA
>United Kingdom
>+44 1908 654658
>
>
>
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