How to optimize the calculation of the mean between the elements of A and B efficiently?

hello, everything okay ?

if A=[a1 a2 a3 a4 a5 ..................an]

and B=[b1 b2 b3 b4 b5 ...............bn]

How to optimize the calculation of the mean between the elements of A and B efficiently?

for exemple

C=[(a1+b1)/2 (a2+b2)/2 (a3+b3)/2 ...................(an+bn)/2 ]

Answer 1

[David Hill]

C=(A+B)/2;