create a matrix where the elements are the sums of the elements of an old matrix

Hello,

Consider a 100x1 matrix, namely A.

How can I create a new matrix B where

the 1st row of B is the sum of the 1st and 2nd row of A,

the 2nd row of B is the sum of the 3rd and 4th row of A,

the 3rd row of B is the sum of the 5th and 6th row of A,

etc.

Thank you.

Pavlos

Answer 1

[Wayne King]

You say matrix in your post, but then you give an example of a column vector (100x1). I'll assume you mean column vector.

    A = randn(100,1);
    B = filter([1 1],1,A);
    B = B(2:2:end);