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  \link{S4groupGeneric} for group generics for S4 methods.
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  \link{S4groupGeneric} for group generics for S4 methods.
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}
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}
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\examples{
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\examples{
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require(utils)
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require(utils)
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d.fr <- data.frame(x=1:9, y=stats::rnorm(9))
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d.fr <- data.frame(x = 1:9, y = stats::rnorm(9))
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class(1 + d.fr) == "data.frame" ##-- add to d.f. ...
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class(1 + d.fr) == "data.frame" ##-- add to d.f. ...
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methods("Math")
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methods("Math")
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methods("Ops")
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methods("Ops")
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methods("Summary")
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methods("Summary")