File: first.R

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first <- function(x, n=1, ...) head(x, n=n, ...)
last  <- function(x, n=1, ...) tail(x, n=n, ...)

"first<-" <- function(x, n=1, ..., value)
{
  x[1:n] <- value[1:n]
  x
}

"last<-" <- function(x, n=1, ..., value)
{
  index <- seq(length(x)-n+1, length(x))
  x[index] <- value[1:n]
  x
}