dssdata - Extract descriptor state-space data
Syntax
[A,B,C,D,E] = dssdata(sys)
[A,B,C,D,E,Ts] = dssdata(sys)
Description
[A,B,C,D,E] = dssdata(sys) returns the
values of the A, B, C, D, and E matrices for the descriptor state-space
model sys (see dss). dssdata equals ssdata for regular state-space models
(i.e., when E=I).
If sys has internal delays, A, B, C, D are
obtained by first setting all internal delays to zero (creating a
zero-order Padé approximation). For some systems, setting delays
to zero creates singular algebraic loops, which result in either improper
or ill-defined, zero-delay approximations. For these systems, dssdata cannot
display the matrices and returns an error. This error does not imply
a problem with the model sys itself.
[A,B,C,D,E,Ts] = dssdata(sys) also returns
the sample time Ts.
You can access other properties of sys using get or direct structure-like referencing
(e.g., sys.Ts).
For arrays of SS models with variable order, use the syntax
[A,B,C,D,E] = dssdata(sys,'cell')
to extract the state-space matrices of each model as separate
cells in the cell arrays A, B, C, D, and E.
See Also
dss, get, getdelaymodel, ltimodels, ltiprops, ssdata
 | dss | | esort |  |
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