MATLAB: Combining two different matrices of different sizes

Question

I want to combine two different matrices with a different number of columns so that the output has the lower number of columns. I also want the columns that were "modified" to have the average value of what they were modified. I think these examples clarify what I'm trying to say:

For example, for matrices that are multiples of each other:

 A=[5 6]
 B=[1 2 3 4]
I would combine these matrices so
 C=[5 6; 1.5 3.5]

Now if the matrices aren't multiples of each other, then it would combine to whichever value it finds fit, for example:

 A=[5 6]
 B=[1 2 3 4 5]
Then the output is:
 C=[5 6; 2 4.5] (The first 3 values were averaged)

Thanks

Answer 1

A=[5 6] 
B=[1 2 3 4 5]
m=numel(B);
m1=ceil(m/2)
C=[A;mean(B(1:m1)) mean(B(m1+1:end))]