col

Mengembalikan matriks bilangan bulat yang menunjukkan nomor kolomnya dalam objek mirip matriks, atau faktor label kolom.

Syntax

R Copy

col(x, as.factor = FALSE)
.col(dim)

Arguments

Parameter	Deskripsi
x	a matrix-like object, that is one with a two-dimensional dim.
dim	a matrix dimension, i.e., an integer valued numeric vector of length two (with non-negative entries).
as.factor	a logical value indicating whether the value should be returned as a factor of column labels (created if necessary) rather than as numbers.

Return Value

Matriks bilangan bulat (atau faktor) dengan dimensi yang sama dengan x dan elemen ke-ijnya sama dengan j (atau label kolom ke-j).

Contoh

Example

R Copy

# NOT RUN {
# extract an off-diagonal of a matrix
ma <- matrix(1:12, 3, 4)
ma[row(ma) == col(ma) + 1]

# create an identity 5-by-5 matrix more slowly than diag(n = 5):
x <- matrix(0, nrow = 5, ncol = 5)
x[row(x) == col(x)] <- 1

(i34 <- .col(3:4))
stopifnot(identical(i34, .col(c(3,4)))) # 'dim' maybe "double"
# }

See Also

row to get rows; slice.index for a general way to get slice indices in an array.