code: public static void fill( DMatrix5 a , double v  ) {
          a.a1 = v;
          a.a2 = v;
          a.a3 = v;
          a.a4 = v;
          a.a5 = v;
      }
docs: <p>
  Sets every element in the vector to the specified value.<br>
  <br>
  a<sub>i</sub> = value
  <p>
  
  @param a A vector whose elements are about to be set. Modified.
  @param v The value each element will have.