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