how to use the nthroot function in R

user_11139447 0
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I am trying to use the nthroot function from the pracma package. However, whenever I run it I get an error:

Error in nthroot(x, 5) : could not find function "nthroot"

I tried installing the pracma package but that didn't help either. Could anyone give me any ideas on why this isn't working?

nth-root r
2 Answers

nthroot handles negatives, e.g. returning nthroot(-2,3) == -1.259921, rather than NA

To define this yourself:

nthroot = function(x,n) {
  (abs(x)^(1/n))*sign(x)
}
user_153637320

Just do

x ^ (1 / n)

Where n is the root.

user_45753310
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