Re: [R] R: to the power

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Tue 12 Jul 2005 - 23:51:36 EST

On 7/12/2005 9:29 AM, Robin Hankin wrote:
> Hi
>
> I find that one often needs to keep reals real and complexes complex.
>
> Try this:
>
> "cuberooti" <-
> function (x)
> {
> if (is.complex(x)) {
> return(sqrt(x + (0+0i)))
> }
> sign(x)* abs(x)^(1/3)
> }
>
>
> best wishes
>
> [see that (0+0i) sitting there!]

I don't understand this.

  1. I don't think you meant to use sqrt() there, did you??
  2. What effect does the 0+0i have? x has already been determined to be complex.

Duncan Murdoch



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