MATLAB: Can somebody explain me this answer

Question

a=[1 2; 3 4]; a(3*ones(2)) ans= 2 2 2 2

Answer 1

The code copies the third element of a as 2 by 2 matrix, see the below example:

>> a
a =
     1     2
     3     4
>> a(:)
ans =
     1
     3
     2
     4
>> a([3,3;3,3])
ans =
     2     2
     2     2
>>