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

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pavlos
pavlos 2012-10-2
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

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Wayne King
Wayne King 2012-10-2
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);

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