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}
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}
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\details{
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\details{
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  Both the extractor and replacement forms are generic and new methods
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  Both the extractor and replacement forms are generic and new methods
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  can be written for them.  The most important method for the replacement
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  can be written for them.  The most important method for the replacement
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  function is that for \code{\link{factor}}s.
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  function is that for \code{\link{factor}}s.
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  For the factor replacement method, a \code{NA} in \code{value}
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  For the factor replacement method, a \code{NA} in \code{value}
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  causes that level to be removed from the levels and the elements
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  causes that level to be removed from the levels and the elements
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  formerly with that level to be replaced by \code{NA}.
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  formerly with that level to be replaced by \code{NA}.
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  Note that for a factor, replacing the levels via
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  Note that for a factor, replacing the levels via