** Schur decomposition. **

** [U,T] = SCHUR(X) produces a Schur matrix T and a unitary **

** matrix U so that X = U*T*U' and U'*U = EYE (U). **

** By itself, SCHUR(X) returns T. **

** If X is complex, the Complex Schur Form is returned in matrix T. **

** The Complex Schur Form is upper triangular with the eigenvalues **

** of X on the diagonal. **

** If X is real, the Real Schur Form is returned. The Real Schur **

** Form has the real eigenvalues on the diagonal and the complex **

** eigenvalues in 2-by-2 blocks on the diagonal. **

** See RSF2CSF to convert from Real to Complex Schur form. **

** **