code: public static void elementMult( DMatrix3 a , DMatrix3 b) {
          a.a1 *= b.a1;
          a.a2 *= b.a2;
          a.a3 *= b.a3;
      }
docs: <p>Performs an element by element multiplication operation:<br>
  <br>
  a<sub>i</sub> = a<sub>i</sub> * b<sub>i</sub> <br>
  </p>
  @param a The left vector in the multiplication operation. Modified.
  @param b The right vector in the multiplication operation. Not modified.