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}
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}
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\value{
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\value{
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  If \code{FUN} is not \code{NULL}, it is passed to
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  If \code{FUN} is not \code{NULL}, it is passed to
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  \code{\link{match.fun}}, and hence it can be a function or a symbol or
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  \code{\link{match.fun}}, and hence it can be a function or a symbol or
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  character string naming a function.
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  character string naming a function.
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  When \code{FUN} is present, \code{tapply} calls \code{FUN} for each
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  When \code{FUN} is present, \code{tapply} calls \code{FUN} for each
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  cell that has any data in it.  If \code{FUN} returns a single atomic
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  cell that has any data in it.  If \code{FUN} returns a single atomic
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  value for each such cell (e.g., functions \code{mean} or \code{var})
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  value for each such cell (e.g., functions \code{mean} or \code{var})
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  and when \code{simplify} is \code{TRUE}, \code{tapply} returns a
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  and when \code{simplify} is \code{TRUE}, \code{tapply} returns a
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  multi-way \link{array} containing the values, and \code{NA} for the
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  multi-way \link{array} containing the values, and \code{NA} for the