col
Column and Row Identification in a Matrix
Description
Return a matrix filled with integers, where each element corresponds to the number of its column or row.
Usage
col(x, as.factor = FALSE)
row(x, as.factor = FALSE)
.col(dim)
.row(dim)
Arguments
| x |
a matrix. Missing values (NAs) are allowed.
|
| as.factor |
a logical value. If FALSE (the default), the output is an integer matrix. If TRUE, the outpus
is a factor matrix.
|
| dim |
a vector of two nonnegative integers giving the dimensions of a matrix.
|
Value
col(x) and row(x) return an integer with the same dimensions
as the x matrix, but where each element contains the
number of the column or row of which it is a member.
col(x, as.factor=TRUE) and row(x, as.factor=TRUE) return
a factor with the same dimensions as x. Instead of the column or row
number in each entry, the column or row name is used (or, if there
are no column or row names, the column or row number as a string).
.col(dim) and .row(dom) return the same thing as
col(array(1, dim=dim)) and row(array(1, dim=dim)), respectively.
- col: the value of the col(x)[i,j]-th element
is the same for all of the col(x)[,j] elements.
- row: the value of the row(x)[i,j]-th element
is the same for all of the row(x)[i,] elements.
See Also
Examples
x <- matrix(101:106, nrow=3, ncol=2,
dimnames=list(Rows=paste0("R",1:3), Cols=paste0("C",1:2)))
col(x)
col(x, as.factor = TRUE)
row(x)
.row(dim(x))