F08YUF Example Program Results

 Reordered Schur matrix A
                    1                 2                 3                 4
 1  ( 4.6904, 2.3452) (-2.1563, 0.1192) ( 1.9599,-0.5174) ( 1.8091,-1.2060)
 2  ( 0.0000, 0.0000) ( 2.0084,-1.0042) ( 0.9161,-0.2762) ( 1.8574,-0.5326)
 3  ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 1.6985, 1.6985) ( 0.1270, 0.7231)
 4  ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 6.0000,-2.0000)

 Reordered Schur matrix B
                    1                 2                 3                 4
 1  ( 2.3452, 0.0000) (-0.6181, 1.8237) ( 0.9290, 0.5409) ( 2.7136,-1.5076)
 2  ( 0.0000, 0.0000) ( 1.0042, 0.0000) ( 1.2251,-1.1857) ( 1.8541,-0.2929)
 3  ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 0.8492, 0.0000) ( 0.1435, 0.9053)
 4  ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 0.0000, 0.0000) ( 2.0000, 0.0000)

 Basis of left deflating invariant subspace
                    1                 2
 1  ( 0.9045, 0.3015) (-0.0033,-0.2397)
 2  ( 0.3015, 0.0000) ( 0.2497, 0.7157)
 3  ( 0.0000, 0.0000) ( 0.0549, 0.6042)
 4  ( 0.0000, 0.0000) ( 0.0000, 0.0000)

 Basis of right deflating invariant subspace
                    1                 2
 1  ( 0.7071, 0.0000) (-0.5607, 0.0000)
 2  ( 0.7071, 0.0000) ( 0.5607, 0.0000)
 3  ( 0.0000, 0.0000) ( 0.0552, 0.6067)
 4  ( 0.0000, 0.0000) ( 0.0000, 0.0000)

 Norm estimate of projection onto left  eigenspace for selected cluster
   8.90E+00

 Norm estimate of projection onto right eigenspace for selected cluster
   7.02E+00

 F-norm based upper bound on Difu
   2.18E-01

 F-norm based upper bound on Difl
   2.62E-01