% Mex file wrapper around LAPACK Schur reordering routine dtrsen
% Input:
%  Q, T:   real Schur form
%  select: indices of eigenvalues for selected subspace
% Output:
%  Q,  T:  sorted real Schur form
%  WR, WI: real and imaginary parts of the eigenvalues
%  s:      lower bound on reciprocal condition number of cluster
%  sep:    estimated reciprocal condition number on invariant subspace

% dbindel, 03 Oct 2002