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\name{dataframeHelpers}
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\name{dataframeHelpers}
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\title{Data Frame Auxiliary Functions}
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\title{Data Frame Auxiliary Functions}
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\alias{row.names}
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\alias{row.names.data.frame}
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\alias{row.names.default}
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\alias{row.names<-}
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\alias{row.names<-.data.frame}
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\alias{row.names<-.default}
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\alias{xpdrows.data.frame}
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\alias{xpdrows.data.frame}
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\description{
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\description{
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  Auxiliary functions for use with data frames.
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  Auxiliary functions for use with data frames.
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}
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}
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\usage{
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\usage{
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row.names(x)
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row.names(x) <- value
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xpdrows.data.frame(x, old.rows, new.rows)
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xpdrows.data.frame(x, old.rows, new.rows)
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}
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}
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\arguments{
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\arguments{
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  \item{x}{object of class \code{data.frame}.}
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  \item{x}{object of class \code{data.frame}.}
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  \item{value}{a vector with the same length as the number of rows of
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    \code{x}, to be coerced to character.  Duplicated or missing values
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    are not allowed.}
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  \item{old.rows, new.rows}{row names for old and new rows.}
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  \item{old.rows, new.rows}{row names for old and new rows.}
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}
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}
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\value{
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\details{
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  \code{row.names} can be used to set and retrieve the row names of a
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  data frame, similarly to \code{\link{rownames}} for arrays (and
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  it is a generic function that calls \code{rownames} for an
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  array argument).}
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  \code{xpdrows.data.frame} is an auxiliary function which expands the
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  \code{xpdrows.data.frame} is an auxiliary function which expands the
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  rows of a data frame.  It is used by the data frame methods of
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  rows of a data frame.  It is used by the data frame methods of
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  \code{[<-} and \code{[[<-} (which perform subscripted assignments on a
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  \code{[<-} and \code{[[<-} (which perform subscripted assignments on a
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  data frame), and not intended to be called directly.
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  data frame), and not intended to be called directly.
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}
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}
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\references{
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  Chambers, J. M. (1992)
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  \emph{Data for models.}
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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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}
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\seealso{
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\seealso{
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  \code{\link{data.frame}}
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  \code{\link{[.data.frame}}
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}
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}
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\keyword{classes}
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\keyword{methods}
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\keyword{internal}