[R] The elegant way to test if a number is a whole number
dwinsemius at comcast.net
Thu Sep 8 21:42:54 CEST 2011
On Sep 8, 2011, at 3:35 PM, Alexander Engelhardt wrote:
> Am 08.09.2011 20:48, schrieb Marc Schwartz:
> > There was a post from Martin Maechler some years ago and I had to
> search a bit to find it. For these sorts of issues, I typically
> trust his judgement.
> > The post is here:
> > https://stat.ethz.ch/pipermail/r-help/2003-April/032471.html
> > His solution also handles complex numbers.
> For those too lazy to follow
> He is basically creating the function is.whole:
> is.whole <- function(x)
> is.numeric(x) && floor(x)==x
Are you sure? I thought the test would have been all.equal(x, round(x,
My reasoning was that 1.999999999999 should be considered 2 but floor
would make it 1.
> isTRUE(all.equal(x, floor(x)))
> all.equal(x, round(x,0))
> Seems like the most appropriate way now. I'll make it so!
> Thanks for your help :-)
> -- Alex
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
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