dim: Dimensions of an Object
In robertzk/monadicbase: The R Base Package

Description Usage Arguments Details Value References See Also Examples

Retrieve or set the dimension of an object.

1 2	dim(x) dim(x) <- value

`x`	an R object, for example a matrix, array or data frame.
`value`	For the default method, either `NULL` or a numeric vector, which is coerced to integer (by truncation).

The functions dim and dim<- are internal generic primitive functions.

dim has a method for data.frames, which returns the lengths of the row.names attribute of x and of x (as the numbers of rows and columns respectively).

For an array (and hence in particular, for a matrix) dim retrieves the dim attribute of the object. It is NULL or a vector of mode integer.

The replacement method changes the "dim" attribute (provided the new value is compatible) and removes any "dimnames" and "names" attributes.

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

ncol, nrow and dimnames.

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]