[R] using as.numeric() without generating warning message

[Gabor Grothendieck]

Try this:

suppressWarnings(as.numeric("A"))

On Fri, Apr 9, 2010 at 7:22 PM, Andrew Yee <yee at 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
>
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