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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