This example finds the generalized Schur factorization of the matrix pair $\left(A,B\right)$, where and such that the eigenvalues of $\left(A,B\right)$ for which $\left|\lambda \right|<6$ correspond to the top left diagonal elements of the generalized Schur form, $\left(S,T\right)$. Estimates of the condition numbers for the selected eigenvalue cluster and corresponding deflating subspaces are also returned.

Note that the block size (NB) of $64$ assumed in this example is not realistic for such a small problem, but should be suitable for large problems.