code: public static void divRow(Matrix A, int i, int start, int to, double c)
      {
          for(int j = start; j < to; j++)
              A.set(i, j, A.get(i, j)/c);
      }
docs: Updates the values of row <tt>i</tt> in the given matrix to be A[i,:] = A[i,:] / c
  
  @param A the matrix to perform he update on
  @param i the row to update
  @param start the first index of the row to update from (inclusive)
  @param to the last index of the row to update (exclusive)
  @param c the constant to divide each element by