MATLAB: What’s the answer and what’s mean ?? about matrices

Question

a = [ 3 4 ; 5 6 ]

b = [ 1 0 ; 0 1 ]

g = a|b ——> what's the answer and what's mean ??

Answer 1

g=[1 1;1 1]

mean of matrix is the sum of each column divied by number of elements in it

so in this case mean of matrix is a 1*2 matrix