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  zero-row arguments.  (If that leaves none, it returns the first
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  zero-row arguments.  (If that leaves none, it returns the first
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  argument with columns otherwise a zero-column zero-row data frame.)
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  argument with columns otherwise a zero-column zero-row data frame.)
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  It then takes the classes of the columns from the
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  It then takes the classes of the columns from the
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  first data frame, and matches columns by name (rather than by
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  first data frame, and matches columns by name (rather than by
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  position).  Factors have their levels expanded as necessary (in the
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  position).  Factors have their levels expanded as necessary (in the
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  order of the levels of the levelsets of the factors encountered) and
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  order of the levels of the level sets of the factors encountered) and
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  the result is an ordered factor if and only if all the components were
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  the result is an ordered factor if and only if all the components were
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  ordered factors.  (The last point differs from S-PLUS.)  Old-style
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  ordered factors.  (The last point differs from S-PLUS.)  Old-style
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  categories (integer vectors with levels) are promoted to factors.
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  categories (integer vectors with levels) are promoted to factors.
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  Note that for result column \code{j}, \code{\link{factor}(., exclude = X(j))}
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  Note that for result column \code{j}, \code{\link{factor}(., exclude = X(j))}