| array {base} | R Documentation |
Creates or tests for arrays.
array(data = NA, dim = length(data), dimnames = NULL) as.array(x, ...) is.array(x)
data |
a vector (including a list) giving data to fill the array. |
dim |
the dim attribute for the array to be created, that is a vector of length one or more giving the maximal indices in each dimension. |
dimnames |
either NULL or the names for the
dimensions. This is a list with one component for each dimension,
either NULL or a character vector of the length given by
dim for that dimension. The list can be named, and the list names
will be used as names for the dimensions. If the list is shorter
than the number of dimensions, it is extended by NULLs to the
length required |
x |
an R object. |
... |
additional arguments to be passed to or from methods. |
array returns an array with the extents specified in dim
and naming information in dimnames. The values in data are
taken to be those in the array with the leftmost subscript moving
fastest. If there are too few elements in data to fill the array,
then the elements in data are recycled. If data has
length zero, NA of an appropriate type is used for atomic
vectors (0 for raw vectors) and NULL for lists.
as.array is a generic function for coercing to arrays. The
default method does so by attaching a dim attribute to
it. It also attaches dimnames if x has
names. The sole purpose of this is to make it possible
to access the dim[names] attribute at a later time.
is.array returns TRUE or FALSE depending on
whether its argument is an array (i.e., has a dim attribute of
positive length) or not. It is generic: you can write methods to handle
specific classes of objects, see InternalMethods.
is.array is a primitive function so any argument name is
ignored.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
dim(as.array(letters)) array(1:3, c(2,4)) # recycle 1:3 "2 2/3 times" # [,1] [,2] [,3] [,4] #[1,] 1 3 2 1 #[2,] 2 1 3 2