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}
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}
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\alias{nlevels}
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\alias{nlevels}
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\description{
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\description{
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  Return the number of levels which its argument has.
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  Return the number of levels which its argument has.
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}
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}
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\arguments{
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  \item{x}{an object, usually a factor.}
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}
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\details{
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\details{
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  If the argument is not a \code{\link{factor}}, \code{NA} is returned.
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  If the argument is not a \code{\link{factor}}, \code{NA} is returned.
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  The actual factor levels (if they exist) can be obtained
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  The actual factor levels (if they exist) can be obtained
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  with the \code{\link{levels}} function.
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  with the \code{\link{levels}} function.