[R] extraction of roots in R
dmck at u.washington.edu
Fri Nov 1 19:32:05 CET 2013
If you want complex roots, there is a post by Ravi Varadhan from
2010, a reprint of which I found quickly by a google search at
On 1-Nov-13, at 11:20 AM, Don McKenzie wrote:
> If you just want the nth root of X, use X^(1/n)
> > x <- 256
> > x^(1/8)
>  2
> > x <- -256
> > x^(1/8)
>  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
>> 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!
>> [[alternative HTML version deleted]]
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> and provide commented, minimal, self-contained, reproducible code.
> 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
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-
> and provide commented, minimal, self-contained, reproducible code.
Pacific Wildland Fire Sciences Lab
US Forest Service
School of Environmental and Forest Sciences
University of Washington
dmck at uw.edu
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