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  When \code{[} is used with a logical matrix, each value is coerced to
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  When \code{[} is used with a logical matrix, each value is coerced to
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  the type of the column in which it is to be placed.
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  the type of the column in which it is to be placed.
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  When  \code{[} and \code{[[} are used with two indices, the
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  When  \code{[} and \code{[[} are used with two indices, the
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  column will be coerced as necessary to accommodate the value.
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  column will be coerced as necessary to accommodate the value.
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  Note that when the replacement value is an array (including a matrix)
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  it is \emph{not} treated as a series of columns (as
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  \code{\link{data.frame}} and \code{\link{as.data.frame}} do) but
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  inserted as a single column.
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}
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}
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\section{Warning}{
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\section{Warning}{
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  Although the default for \code{drop} is \code{TRUE}, the default
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  Although the default for \code{drop} is \code{TRUE}, the default
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  behaviour  when only one \emph{row} is left is equivalent to
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  behaviour  when only one \emph{row} is left is equivalent to
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  specifying \code{drop = FALSE}.  To drop from a data frame to a list,
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  specifying \code{drop = FALSE}.  To drop from a data frame to a list,