[v,w] = eig(D)
v =
   -0.2801    0.7408   -0.6106
   -0.9537   -0.2873    0.0889
   -0.1096    0.6072    0.7869
w =
    0.0913         0         0
         0    0.2266         0
         0         0    0.4178

    [x,y,z] = svd(D)
x =
   -0.6106   -0.7408   -0.2801
    0.0889    0.2873   -0.9537
    0.7869   -0.6072   -0.1096
y =
    0.4178         0         0
         0    0.2266         0
         0         0    0.0913
z =
   -0.6106   -0.7408   -0.2801
    0.0889    0.2873   -0.9537
    0.7869   -0.6072   -0.1096

    v*w/v
ans =
    0.2873   -0.0465   -0.0960
   -0.0465    0.1050   -0.0008
   -0.0960   -0.0008    0.3434

    x*y*z'
ans =
    0.2873   -0.0465   -0.0960
   -0.0465    0.1050   -0.0008
   -0.0960   -0.0008    0.3434