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  The functions \code{cbind} and \code{rbind} are generic, with methods
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  The functions \code{cbind} and \code{rbind} are generic, with methods
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  for data frames.  The data frame method will be used if an argument is
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  for data frames.  The data frame method will be used if an argument is
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  a data frame and the rest are vectors or matrices.  There can be other
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  a data frame and the rest are vectors or matrices.  There can be other
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  methods; in particular, there is one for time series objects.
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  methods; in particular, there is one for time series objects.
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  Data frames can be \code{cbind}-ed with matrices, in which case
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  each matrix forms a single column in the result, unlike calling
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  \code{\link{data.frame}}.
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  The \code{rbind} data frame method takes the classes of the columns
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  The \code{rbind} data frame method takes the classes of the columns
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  from the first
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  from the first
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  data frame.  Factors have their levels expanded as necessary (in
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  data frame.  Factors have their levels expanded as necessary (in
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  the order of the levels of the levelsets of the factors encountered)
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  the order of the levels of the levelsets of the factors encountered)
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  and the result is an ordered factor if and only if all the components
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  and the result is an ordered factor if and only if all the components