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  \item{x}{a list or data frame to be stacked or unstacked.}
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  \item{x}{a list or data frame to be stacked or unstacked.}
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  \item{select}{an expression, indicating which variable(s) to select from a
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  \item{select}{an expression, indicating which variable(s) to select from a
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    data frame.}
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    data frame.}
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  \item{form}{a two-sided formula whose left side evaluates to the
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  \item{form}{a two-sided formula whose left side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    indicator of the groups to create.  Defaults to \code{formula(x)}
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    indicator of the groups to create.  Defaults to \code{\link{formula}(x)}
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    in the data frame method for \code{unstack}.}
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    in the data frame method for \code{unstack}.}
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  \item{\dots}{further arguments passed to or from other methods.}
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  \item{\dots}{further arguments passed to or from other methods.}
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}
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}
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\details{
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\details{
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  The \code{stack} function is used to transform data available as
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  The \code{stack} function is used to transform data available as
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  be used in an analysis of variance model or other linear model.  The
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  be used in an analysis of variance model or other linear model.  The
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  \code{unstack} function reverses this operation.
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  \code{unstack} function reverses this operation.
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  Note that \code{stack} applies to \emph{vectors} (as determined by
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  Note that \code{stack} applies to \emph{vectors} (as determined by
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  \code{\link{is.vector}}): non-vector columns (e.g., factors) will be
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  \code{\link{is.vector}}): non-vector columns (e.g., factors) will be
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  ignored (with a warning as from \R 2.15.0).  Where vectors of
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  ignored.  Where vectors of different types are selected they are
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  different types are selected they are concatenated by
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  concatenated by \code{\link{unlist}} whose help page explains how the
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  \code{\link{unlist}} whose help page explains how the type of the
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  type of the result is chosen.
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  result is chosen.
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  These functions are generic: the supplied methods handle data frames
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  These functions are generic: the supplied methods handle data frames
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  and objects coercible to lists by \code{\link{as.list}}.
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  and objects coercible to lists by \code{\link{as.list}}.
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}
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}
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