col
From base v3.3
by Rcore Rcore@Rproject.org
Column Indexes
Returns a matrix of integers indicating their column number in a matrixlike object, or a factor of column labels.
 Keywords
 array
Usage
col(x, as.factor = FALSE)
Arguments
 x
 a matrixlike object, that is one with a twodimensional
dim
.  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.
Value

An integer (or factor) matrix with the same dimensions as x and whose
ijth element is equal to j (or the jth column label).
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
row
to get rows.
Examples
library(base)
# extract an offdiagonal of a matrix
ma < matrix(1:12, 3, 4)
ma[row(ma) == col(ma) + 1]
# create an identity 5by5 matrix
x < matrix(0, nrow = 5, ncol = 5)
x[row(x) == col(x)] < 1
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