1\name{all.is.numeric}
2\alias{all.is.numeric}
3\title{Check if All Elements in Character Vector are Numeric}
4\description{
5Tests, without issuing warnings, whether all elements of a character
6vector are legal numeric values, or optionally converts the vector to a
7numeric vector.  Leading and trailing blanks in \code{x} are ignored.
8}
9\usage{
10all.is.numeric(x, what = c("test", "vector"), extras=c('.','NA'))
11}
12\arguments{
13  \item{x}{a character vector}
14  \item{what}{specify \code{what="vector"} to return a numeric vector if
15	it passes the test, or the original character vector otherwise}
16  \item{extras}{a vector of character strings to count as numeric
17	values, other than \code{""}.}
18}
19\value{a logical value if \code{what="test"} or a vector otherwise}
20\author{Frank Harrell}
21\seealso{\code{\link{as.numeric}}}
22\examples{
23all.is.numeric(c('1','1.2','3'))
24all.is.numeric(c('1','1.2','3a'))
25all.is.numeric(c('1','1.2','3'),'vector')
26all.is.numeric(c('1','1.2','3a'),'vector')
27all.is.numeric(c('1','',' .'),'vector')
28}
29\keyword{character}
30