Incremental summation of vector

If A = [1 2 3 4 5 6 7 8 9];

Then how to get B = [A(1)+A(2), A(2)+A(3), A(n-1)+A(n)]; with a single command or short code ??

Answer 1

[Walter Roberson]

A = [1 2 3 4 5 6 7 8 9]

A = 1×9

1 2 3 4 5 6 7 8 9

movsum(A,2)

ans = 1×9

1 3 5 7 9 11 13 15 17

[Kasim Shaikh]

Thank you for your answer. I have little concern here, i dont want the starting point (1) of this ans. how to avoid that ?? ans should be directly from 3 5 7 9 11 13 15 17

[Walter Roberson]

A = [1 2 3 4 5 6 7 8 9]

A = 1×9

1 2 3 4 5 6 7 8 9

movsum(A, 2, 'Endpoints', 'discard')

ans = 1×8

3 5 7 9 11 13 15 17

Answer 2

[Steven Lord]

The + operator can add vectors.

A = 1:10;
B = A(1:end-1)+A(2:end)

B = 1×9

3 5 7 9 11 13 15 17 19

[Walter Roberson]

... which is probably the answer expected for the homework ;-)