code: public static void divide( DMatrix2 a , double alpha , DMatrix2 b ) {
          b.a1 = a.a1/alpha;
          b.a2 = a.a2/alpha;
      }
docs: <p>
  Performs an element by element scalar division.  Scalar denominator.<br>
  <br>
  b<sub>i</sub> = a<sub>i</sub> /&alpha;
  </p>
  
  @param alpha the amount each element is divided by.
  @param a The vector whose elements are to be divided.  Not modified.
  @param b Where the results are stored. Modified.