ordschur Orders a schur decomposition
ordschur(Ui, Si, idx)Square upper-triangular matrix matrix from schur decomposition. If Ui is not given it is set to the identity matrix.
Orthogonal matrix from schur decomposition
array index
Returns a list of ordered (U, S)
ordschur finds an orthogonal matrix, U so that the eigenvalues
appearing on the diagonal of Si are ordered according to the
increasing values of the array index where the i-th element
of index corresponds to the eigenvalue appearing as the
element Si[i,i].
ordschur could also be used in this syntax: ordschur(Si, idx)