ordschur function

Ordered schur decomposition

ordschur Orders a schur decomposition

ordschur(Ui, Si, idx)

Arguments

• Ui: Square upper-triangular matrix matrix from schur decomposition. If Ui is not given it is set to the identity matrix.
• Si: Orthogonal matrix from schur decomposition
• idx: array index

Returns

Returns a list of ordered (U, S)

Details

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)