my_arrray = array(c(100,100,100),c(3,3,2))
my_arrray

print('apply squre root on first matrix of array')
my_arrray[,,1] = sqrt(my_arrray[, , 1])
my_arrray

print('2nd columns of 1st matrix power of 3')
my_arrray[,2,1] = my_arrray[,2,1]**3
my_arrray

print('multiply 1st matrix with 2nd matrix element wise')
my_arrray[,,1]*my_arrray[,,2]

print('divide by 5 for any element of 2nd matrix')
my_arrray[1,3,2] = my_arrray[1,3,2]/5
my_arrray[,,2]