If you just want the nth root of X, use X^(1/n)
> x <- 256
> x^(1/8)
[1] 2
> x <- -256
> x^(1/8)
[1] NaN
It appears that you get the positive real root.
Is this all you wanted?
On 1-Nov-13, at 11:11 AM, Gary Dong wrote:
Dear R users,
I wonder if R has a default function that I can use to do
extraction of
roots.
Here is an example:
X N
2.5 5
3.4 7
8.9 9
6.4 1
2.1 0
1.1 2
I want to calculate Y = root(X)^N, where N represents the power.
what is
the easy way to do this?
Thank you!
Gary
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Don McKenzie
Pacific Wildland Fire Sciences Lab
US Forest Service
Affiliate Professor
School of Environmental and Forest Sciences
University of Washington
d...@uw.edu
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