| row {base} | R Documentation |
Returns a matrix of integers indicating their row number in the matrix.
row(x, as.factor = FALSE)
x |
a matrix. |
as.factor |
a logical value indicating whether the value should be returned as a factor rather than as numeric. |
An integer matrix with the same dimensions as x and whose
ij-th element is equal to i.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
col to get columns.
x <- matrix(1:12, 3, 4) # extract the diagonal of a matrix dx <- x[row(x) == col(x)] dx # create an identity 5-by-5 matrix x <- matrix(0, nr = 5, nc = 5) x[row(x) == col(x)] <- 1 x