In R, you can get the size or length of an array using the length() function. Here are some examples:
Example 1: Getting the size of a vector
# Create a vector
vec <- c(1, 2, 3, 4, 5)
# Get the size of the vector
length(vec)
Output:
[1] 5
Example 2: Getting the size of a matrix
# Create a matrix
mat <- matrix(1:6, nrow = 2, ncol = 3)
# Get the size of the matrix
length(mat)
Output:
[1] 6
Example 3: Getting the size of a 3D array
# Create a 3D array
arr <- array(1:24, dim = c(2, 3, 4))
# Get the size of the 3D array
length(arr)
Output:
[1] 24
In all these examples, the length() function returns the number of elements in the array.