F07JNF Example Program Data
    4                                                    :Value of N
   16.0          41.0          46.0          21.0        :End of diagonal D
 ( 16.0, 16.0) ( 18.0, -9.0) (  1.0, -4.0)               :End of sub-diagonal E
 ( 64.0, 16.0) ( 93.0, 62.0) ( 78.0,-80.0) ( 14.0,-27.0) :End of vector b