Thanks for the tip!

Andrew

On Fri, Apr 9, 2010 at 8:04 PM, Gabor Grothendieck
<ggrothendieck@gmail.com>wrote:

> Try this:
>
> suppressWarnings(as.numeric("A"))
>
> On Fri, Apr 9, 2010 at 7:22 PM, Andrew Yee <yee@post.harvard.edu> wrote:
> > I'm interested in testing whether or not a character string is numeric or
> > not as follows:
> >
> > is.na(as.numeric('3')) # returns F
> > is.na(as.numeric('A')) # I'd like this to return T without issuing a
> warning
> > about NAs introduced by coercion.
> >
> > I guess you could suppress the warning with options(warn=-1), but I was
> > wondering if there's an alternative.  Or perhaps an alternative that
> doesn't
> > use as.numeric()?
> >
> > Thanks,
> > Andrew
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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