Array
  • store data in more than two dimensions
    • Create Array
    # create a 3d array
A = array(1:12, dim = c(2, 3, 2))
print(A)

# create a 3d empty array
B = array(0, dim = c(2, 3, 2))
print(B)
    Accesing
    # create a 3d array
A = array(1:12, dim = c(2, 3, 2))

print(A[, , 2]) # second matrix
print(A[1, , 1]) # first row of the first matrix
    Operations
    # create a 3d array
A = array(1:12, dim = c(2, 3, 2))
print(A)

B = apply(A, c(1), sum) # all rows
B = apply(A, c(2), sum) # all column
B = apply(A, c(3), sum) # all matrices
B = apply(A, c(1, 2), sum) # sum of element along all matrices direction
print(B)