| dim {base} | R Documentation |
Retrieve or set the dimension of an object.
dim(x) dim(x) <- values
The functions dim and dim<- are generic.
For an array (and hence in particular, for a matrix) they retrieve or
set the dim attribute of the object. It is always
integer or NULL.
dim has a method for data.frames, which returns
the length of the row.names attribute of x and the
length of x (the numbers of ``rows'' and ``columns'').
x <- 1:12 ; dim(x) <- c(3,4) x # simple versions of nrow and ncol could be defined as follows nrow0 <- function(x) dim(x)[1] ncol0 <- function(x) dim(x)[2]