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\name{all.is.numeric}
\alias{all.is.numeric}
\title{Check if All Elements in Character Vector are Numeric}
\description{
Tests, without issuing warnings, whether all elements of a character
vector are legal numeric values, or optionally converts the vector to a
numeric vector. Leading and trailing blanks in \code{x} are ignored.
}
\usage{
all.is.numeric(x, what = c("test", "vector", "nonnum"), extras=c('.','NA'))
}
\arguments{
\item{x}{a character vector}
\item{what}{specify \code{what="vector"} to return a numeric vector if
it passes the test, or the original character vector otherwise, the
default \code{"test"} to return \code{FALSE} if there are no
non-missing non-\code{extra} values of \code{x} or there is at least
one non-numeric value of \code{x}, or \code{"nonnum"} to return the
vector of non-\code{extra}, non-NA, non-numeric values of \code{x}.}
\item{extras}{a vector of character strings to count as numeric
values, other than \code{""}.}
}
\value{a logical value if \code{what="test"} or a vector otherwise}
\author{Frank Harrell}
\seealso{\code{\link{as.numeric}}}
\examples{
all.is.numeric(c('1','1.2','3'))
all.is.numeric(c('1','1.2','3a'))
all.is.numeric(c('1','1.2','3'),'vector')
all.is.numeric(c('1','1.2','3a'),'vector')
all.is.numeric(c('1','',' .'),'vector')
all.is.numeric(c('1', '1.2', '3a'), 'nonnum')
}
\keyword{character}
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