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}
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}
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\arguments{
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\arguments{
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  \item{frame}{a data frame whose components are logical vectors,
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  \item{frame}{a data frame whose components are logical vectors,
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    factors or numeric vectors.}
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    factors or numeric vectors.}
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}
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}
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\details{
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  Suppling a data frame with columns which are not numerical or logical
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  is an error.  A warning is given if any non-factor column as a class,
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  as then information can be lost.
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}
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\seealso{
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\seealso{
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  \code{\link{as.matrix}},
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  \code{\link{as.matrix}},
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  \code{\link{data.frame}},
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  \code{\link{data.frame}},
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  \code{\link{matrix}}.
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  \code{\link{matrix}}.
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}
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}
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  Chambers, J. M. (1992)
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  Chambers, J. M. (1992)
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  \emph{Data for models.}
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  \emph{Data for models.}
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  Chapter 3 of \emph{Statistical Models in S}
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  Chapter 3 of \emph{Statistical Models in S}
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  eds J. M. Chambers and T. J. Hastie, Wadsworth \& Brooks/Cole.
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  eds J. M. Chambers and T. J. Hastie, Wadsworth \& Brooks/Cole.
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}
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}
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\examples{
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DF <- data.frame(a=1:3, b=letters[10:12],
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                 c=seq(as.Date("2004-01-01"), by = "week", len = 3))
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data.matrix(DF[1:2])
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data.matrix(DF) # gives a warning and quotes dates as #days since 1970.
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}
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\keyword{array}
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\keyword{array}