extraction of roots in R
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 [[alternative HTML version deleted]]
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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 dmck at uw.edu