Number of Dimensions

Number of matrix or array dimensions.

ndims(x)

Arguments

x

a vector, matrix, array, or list

Details

Returns the number of dimensions as length(x).

For an empty object its dimension is 0, for vectors it is 1 (deviating from MATLAB), for matrices it is 2, and for arrays it is the number of dimensions, as usual. Lists are considered to be (one-dimensional) vectors.

Value

the number of dimensions in a vector, matrix, or array x.

See also

size

Note

The result will differ from Matlab when x is a vector.

Examples

ndims(c())                      # 0
#> [1] 0
ndims(as.numeric(1:8))          # 1
#> [1] 1
ndims(list(a=1, b=2, c=3))      # 1
#> [1] 1
ndims(matrix(1:12, 3, 4))       # 2
#> [1] 2
ndims(array(1:8, c(2,2,2)))     # 3
#> [1] 3