R(15), Array
Array can only store numeric elements.
We use function array() to create an array.
CREATE
array() functions take vector as inputs and create array using the values in parameter dim.
array(vector, dim)
# Create two vectors of different lengths.
vector1 <- c(5,9,3)
vector2 <- c(10,11,12,13,14,15)
# Take these vectors as input to the array.
result <- array(c(vector1,vector2),dim = c(3,3,2))
print(result)
NAME
dimnames can be used to name the rows, columns, and matrices.
# Create two vectors of different lengths.
vector1 <- c(5,9,3)
vector2 <- c(10,11,12,13,14,15)
column.names <- c("COL1","COL2","COL3")
row.names <- c("ROW1","ROW2","ROW3")
matrix.names <- c("Matrix1","Matrix2")
# Take these vectors as input to the array.
result <- array(c(vector1,vector2),dim = c(3,3,2),dimnames = list(row.names,column.names,matrix.names))
VISIT
use the indexes like array visiting.
OPERATION
Operations are carried out by visiting the elements of matrices, because an array is a multi-dimensional matrix.
Apply()
We can use function apply() to carry out the calculation of matrix elements.
apply(x, margin, fun)
- x: an array
- margin: the name of dataset
- fun: the function applied