A = [1,2,3,4,5]; B = [3,4,5,6,7]; C = [-1,-3,-5,-7,-9]; D(1,5) = 0; for m = 5:-1:1 D(1,m) = A(1,m) - B(1,m) C(1,m); A(1,m) = 2*D(1,m); end A C D