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% File src/library/base/man/Extract.data.frame.Rd
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% File src/library/base/man/Extract.data.frame.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2010 R Core Team
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% Copyright 1995-2013 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{Extract.data.frame}
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\name{Extract.data.frame}
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\alias{[.data.frame}
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\alias{[.data.frame}
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\alias{[[.data.frame}
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\alias{[[.data.frame}
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  description here.
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  description here.
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}
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}
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\value{
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\value{
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  For \code{[} a data frame, list or a single column (the latter two
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  For \code{[} a data frame, list or a single column (the latter two
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  only when dimensions have been dropped).  If matrix indexing is used for
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  only when dimensions have been dropped).  If matrix indexing is used for
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  extraction a matrix results.  If the result would be a data frame an
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  extraction a vector results.  If the result would be a data frame an
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  error results if undefined columns are selected (as there is no general
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  error results if undefined columns are selected (as there is no general
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  concept of a 'missing' column in a data frame).  Otherwise if a single
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  concept of a 'missing' column in a data frame).  Otherwise if a single
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  column is selected and this is undefined the result is \code{NULL}.
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  column is selected and this is undefined the result is \code{NULL}.
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  For \code{[[} a column of the data frame or \code{NULL}
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  For \code{[[} a column of the data frame or \code{NULL}