m = fftm_norm(4);
norm(m(1,:))

ans =

     1

norm(m(2,:))

ans =

     1

norm(m(3,:))

ans =

     1

norm(m(4,:))

ans =

     1

dot(m(1,:), m(2,:))

ans =

        0 -5.7212e-018i

dot(m(1,:), m(3,:))

ans =

        0 -6.1232e-017i

dot(m(1,:), m(4,:))

ans =

  8.3267e-017 -1.0043e-016i

dot(m(2,:), m(3,:))

ans =

        0 -5.7212e-018i

dot(m(2,:), m(4,:))

ans =

        0 -6.1232e-017i

dot(m(3,:), m(4,:))

ans =

        0 -5.7212e-018i

diary off