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tapply(1:n, fac, sum)
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tapply(1:n, fac, sum)
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tapply(1:n, fac, sum, default = 0) # maybe more desirable
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tapply(1:n, fac, sum, default = 0) # maybe more desirable
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tapply(1:n, fac, sum, simplify = FALSE)
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tapply(1:n, fac, sum, simplify = FALSE)
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tapply(1:n, fac, range)
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tapply(1:n, fac, range)
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tapply(1:n, fac, quantile)
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tapply(1:n, fac, quantile)
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tapply(1:n, fac, length) ## NA's
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tapply(1:n, fac, length) ## NAs
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tapply(1:n, fac, length, default = 0) # == table(fac)
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tapply(1:n, fac, length, default = 0) # == table(fac)
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\dontshow{stopifnot(all.equal(
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\dontshow{stopifnot(all.equal(
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  unname(unclass(table(fac))),
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  unname(unclass(table(fac))),
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  unname(        tapply(1:n, fac, length, default = 0))))}
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  unname(        tapply(1:n, fac, length, default = 0))))}
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## example of ... argument: find quarterly means
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## example of ... argument: find quarterly means