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\alias{as.data.frame.model.matrix}
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\alias{as.data.frame.model.matrix}
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\alias{as.data.frame.numeric}
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\alias{as.data.frame.numeric}
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\alias{as.data.frame.ordered}
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\alias{as.data.frame.ordered}
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\alias{as.data.frame.ts}
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\alias{as.data.frame.ts}
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\alias{as.data.frame.vector}
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\alias{as.data.frame.vector}
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\alias{as.data.frame.array}
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\title{
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\title{
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  Coerce to a Data Frame
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  Coerce to a Data Frame
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}
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}
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\description{
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\description{
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  If a list is supplied, each element is converted to a column in the
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  If a list is supplied, each element is converted to a column in the
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  data frame.  Similarly, each column of a matrix is converted separately.
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  data frame.  Similarly, each column of a matrix is converted separately.
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  This can be overridden if the object has a class which has
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  This can be overridden if the object has a class which has
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  a method for \code{as.data.frame}: two examples are
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  a method for \code{as.data.frame}: two examples are
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  matrices of class \code{"\link[stats]{model.matrix}"} (which are included as a
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  matrices of class \code{"\link[stats]{model.matrix}"} (which are
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  single column) and list objects of class \code{"\link{POSIXlt}"} which are
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  included as a single column) and list objects of class
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  \code{"\link{POSIXlt}"} which are coerced to class
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  coerced to class \code{"\link{POSIXct}"}
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  \code{"\link{POSIXct}"}.
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  As from \R 1.9.0 arrays can be converted.  One-dimensional arrays are
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  treated like vectors and two-dimensional arrays like matrices.  Arrays
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  with more than two dimensions are converted to matrices by
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  \sQuote{flattening} all dimensions after the first and creating
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  suitable column labels.
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  Character variables are converted to factor columns unless protected
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  Character variables are converted to factor columns unless protected
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  by \code{\link{I}}.
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  by \code{\link{I}}.
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  If a data frame is supplied, all classes preceding \code{"data.frame"}
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  If a data frame is supplied, all classes preceding \code{"data.frame"}