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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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  separate columns in a data frame or list into a single column that can
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  separate columns in a data frame or list into a single column that can
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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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}
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}
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\value{
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\value{
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  \code{unstack} produces a list of columns according to the formula
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  \code{unstack} produces a list of columns according to the formula
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  \code{form}.  If all the columns have the same length, the resulting
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  \code{form}.  If all the columns have the same length, the resulting
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  list is coerced to a data frame.
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  list is coerced to a data frame.
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  \item{ind}{a factor indicating from which vector in \code{x} the
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  \item{ind}{a factor indicating from which vector in \code{x} the
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    observation originated}
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    observation originated}
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}
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}
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\author{Douglas Bates}
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\author{Douglas Bates}
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\seealso{
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\seealso{
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  \code{\link{lm}}
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  \code{\link{lm}}, \code{\link{reshape}}
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}
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}
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\examples{
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\examples{
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data(PlantGrowth)
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data(PlantGrowth)
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formula(PlantGrowth)         # check the default formula
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formula(PlantGrowth)         # check the default formula
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pg <- unstack(PlantGrowth)   # unstack according to this formula
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pg <- unstack(PlantGrowth)   # unstack according to this formula