Nothing
left <- function(x, n=6L) UseMethod("left")
right <- function(x, n=6L) UseMethod("left")
left.data.frame <- function(x, n=6)
{
stopifnot(length(n) == 1L)
n <- if (n < 0L)
max(ncol(x) + n, 0L)
else min(n, ncol(x))
x[, seq_len(n), drop = FALSE]
}
left.matrix <- left.data.frame
right.data.frame <- function (x, n = 6L, ...)
{
stopifnot(length(n) == 1L)
ncx <- ncol(x)
n <- if (n < 0L)
max(ncx + n, 0L)
else min(n, ncx)
x[, seq.int(to = ncx, length.out = n), drop = FALSE]
}
right.matrix <- function (x, n = 6L, addcolnums = TRUE, ...)
{
stopifnot(length(n) == 1L)
ncx <- ncol(x)
n <- if (n < 0L)
max(ncx + n, 0L)
else min(n, ncx)
sel <- seq.int(to = ncx, length.out = n)
ans <- x[, sel, drop = FALSE]
if (addcolnums && is.null(colnames(x)))
colnames(ans) <- paste0("[", sel, ",]")
ans
}
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