dot product function in Matlab

Hello, I just tried to do in Matlab :

I=eye(3)

dot(I,I)

--> the result is [1 1 1]

To my understanding it clearly should be [0 0 0] !!! Why does it produce 1 1 1 ?

Best regards,

(P.S. It works correctly with other e.g. random matrices)

Answer 1

[Walter Roberson]

    dot(A,B), for N-D arrays A and B, returns the scalar product
    along the first non-singleton dimension of A and B. A and B must
    have the same size.

>> dot(I(:,1),I(:,1))
ans =
     1

[AD]

or sorry .. I made a mistake ... what I did was useless, I was projecting it on itself - so to speak.

projecting each vector on himself gives his own norm