thisarray <- c(1:24)

​

# Access all the items from the first row from matrix one

multiarray <- array(thisarray, dim = c(4, 3, 2))

multiarray[c(1),,1]

​

# Access all the items from the first column from matrix one

multiarray <- array(thisarray, dim = c(4, 3, 2))

multiarray[,c(1),1]

​