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  The functions return \code{FALSE} if the method or class is not
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  The functions return \code{FALSE} if the method or class is not
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  sealed (including the case that it is not defined); \code{TRUE} if
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  sealed (including the case that it is not defined); \code{TRUE} if
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  it is.
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  it is.
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}
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}
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\references{
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\references{
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 Chambers, John M. (2008)
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  \bibshow{R:Chambers:2008}
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 \emph{Software for Data Analysis: Programming with R}
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  Springer.  (For the R version.)
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  (For the R version.)
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 Chambers, John M. (1998)
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  \bibshow{R:Chambers:1998}
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 \emph{Programming with Data}
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 Springer (For the original S4 version.)
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  (For the original S4 version.)
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}
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}
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\examples{
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\examples{
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## these are both TRUE
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## these are both TRUE
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isSealedMethod("+", c("numeric", "character"))
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isSealedMethod("+", c("numeric", "character"))
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isSealedClass("matrix")
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isSealedClass("matrix")