How to sum two rows in a matrix?

Hi everyone,

Suppose I have a matrix:

a = [4 2 1;1 9 6;4 22 4;12 15 1;1 6 8;5 2 6];

I want to summing every two rows together and write in matrix b:

Such as:

b= [23; 58; 28]

details of calculation:

23 = a (1,:) + a (2,:)

58 = a (3,:) + a (4,:)

28 = a (5,:) + a (6,:)

Can anyone help me please?

Answer 1

[Azzi Abdelmalek]

a = [4 2 1;1 9 6;4 22 4;12 15 1;1 6 8;5 2 6]
b=sum(reshape(a',2*size(a,2),[]))

[Moe]

Thank you Azzi, just one transpose was needed in the last.

Answer 2

[Roger Stafford]

 b = sum(reshape(a.',2*size(a,2),[]),1).'; % Assume an even no. of rows

[Moe]

Thanks a lot Roger!