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control.modal_form — Python Control Systems Library 0.10.2 documentation

control.modal_form
control.modal_form(xsys, condmax=None, sort=False)[source]

Convert a system into modal canonical form.

Parameters:
xsysStateSpace object

System to be transformed, with state x.

condmaxNone or float, optional

An upper bound on individual transformations. If None, use bdschur default.

sortbool, optional

If False (default), Schur blocks will not be sorted. See bdschur for sort order.

Returns:
zsysStateSpace object

System in modal canonical form, with state z.

T(M, M) ndarray

Coordinate transformation: z = T * x.

Examples

>>> Gs = ct.tf2ss([1], [1, 3, 2])
>>> Gc, T = ct.modal_form(Gs)  # default reachable
>>> Gc.A                                                    
array([[-2.,  0.],
       [ 0., -1.]])

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