    |                        | 
          |   A*u    B*v     C*w   |   
          |      3      3       3  | 
           -                      - 
 
   where the vectors (u , u , u ),  (v , v , v ),  and (w , w , w ) 
                       1   2   3      1   2   3          1   2   3 

   are unit vectors. This routine produces the matrix: 
     
     
           -                      - 
          |   a*u    a*u     a*u   |    
          |      1      2       3  | 
          |                        | 
   