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

[Bert Gunter]

Scratch my previous suggestion. Utter nonsense. 

Sigh... It's been a tough  week.

-- Bert

Bert Gunter
Genentech Nonclinical Biostatistics
 
 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Andrew Yee
Sent: Friday, April 09, 2010 4:23 PM
To: r-help at stat.math.ethz.ch
Subject: [R] using as.numeric() without generating warning message

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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