A = [1,2,3,4,5,6]
A =
     1     2     3     4     5     6

    B = [1;2;3;4]
B =
     1
     2
     3
     4

    dot(A,A)
ans =
    91

    dot(B,B)
ans =
    30

    A*A'
ans =
    91

    B'*B
ans =
    30

    A = linspace(1,6,6)
A =
     1     2     3     4     5     6

    B = (1./(A'*A))^2
B =
    1.0000    0.2500    0.1111    0.0625    0.0400    0.0278
    0.2500    0.0625    0.0278    0.0156    0.0100    0.0069
    0.1111    0.0278    0.0123    0.0069    0.0044    0.0031
    0.0625    0.0156    0.0069    0.0039    0.0025    0.0017
    0.0400    0.0100    0.0044    0.0025    0.0016    0.0011
    0.0278    0.0069    0.0031    0.0017    0.0011    0.0008