dim {base}

R Documentation

Dimensions of an Object

Description

Retrieve or set the dimension of an object.

Usage

dim(x)
dim(x) <- values

Arguments

x	an R object, for example a matrix, array or data frame.

Details

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”).

See Also

ncol, nrow and dimnames.

Examples

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]

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