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  To add all the rows of a matrix (ie, a single \code{group}) use
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  To add all the rows of a matrix (ie, a single \code{group}) use
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  \code{\link{rowSums}}, which should be even faster.
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  \code{\link{rowSums}}, which should be even faster.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{tapply}}, \code{\link{aggregate}},\code{\link{rowSums}}
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  \code{\link{tapply}}, \code{\link[stats]{aggregate}}, \code{\link{rowSums}}
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}
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}
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\examples{
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\examples{
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x <- matrix(runif(100), ncol=5)
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x <- matrix(runif(100), ncol=5)
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group <- sample(1:8, 20, TRUE)
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group <- sample(1:8, 20, TRUE)
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xsum <- rowsum(x, group)
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xsum <- rowsum(x, group)