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% File src/library/utils/man/stack.Rd
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% File src/library/utils/man/stack.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2016 R Core Team
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% Copyright 1995-2017 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{stack}
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\name{stack}
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\alias{stack}
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\alias{stack}
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\alias{stack.default}
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\alias{stack.default}
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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 with a warning.  Where vectors of different types are selected
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  different types are selected they are concatenated by
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  \code{\link{unlist}} whose help page explains how the type of the
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  they are concatenated by \code{\link{unlist}} whose help page explains
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  result is chosen.
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  how the type of the 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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