docs: public static void scale( double alpha , DMatrix5 a , DMatrix5 b ) {
          b.a1 = a.a1*alpha;
          b.a2 = a.a2*alpha;
          b.a3 = a.a3*alpha;
          b.a4 = a.a4*alpha;
          b.a5 = a.a5*alpha;
      }