Combine two columns into one by first two rows A two rows B and so on

Hi, I want to combine two columns A and B (both 4x1) into one column C by using first the first two rows of A, then the first two rows of B, then the second two rows of A and so on.

A=[1,2,3,4]';
B=[-5,-6,-7,-8]';

I tried

N = size(A,1)+size(B,1) ;
C = zeros(N,1) ;
C(1:2:end) = A ;
C(2:2:end) = B ;

But not working.

Answer should be

C=[1;2;-5;-6;3;4;-7;-8]

Answer 1

[Roger Stafford]

C = reshape([reshape(A,2,[]);reshape(B,2,[])],[],1);

This depends on the lengths of the column vectors A and B being the same multiple of 2.