a*conj(a)

C = P + (a)*(a)'; % size of C is 3 rows and 1 column
D = a*y ; % size of D is 3 rows and 3 columns
E = C'/D

P =
      4.6027 + 0.0000i  -2.2047 - 0.0234i   1.1325 + 0.0227i
     -2.2047 + 0.0234i   1.8646 + 0.0000i  -0.6243 + 0.0022i
      1.1325 - 0.0227i  -0.6243 - 0.0022i   2.1434 - 0.0000i



  a =

    -7.0000 - 7.0000i
    7.0000 + 7.0000i
     -7.0000 - 7.0000i

y = -0.467823107174307 + 1.330265738712274i

C = P + (a)*(a)';
D = a*y ;
E = C.'/D