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\name{is.single}
\title{Is an Object of Single Precision Type?}
\usage{is.single(x)}
\alias{is.single}
\description{
\code{is.single} reports an error. There are no single precision
values in R.
}
\arguments{
  \item{x}{object to be tested.}
}
\references{
  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
  \emph{The New S Language}.
  Wadsworth \& Brooks/Cole.
}
\keyword{classes}