Documentation of ssmodel

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SSMODEL        In case of a userwritten model structure definition, this
           should have the format

   [A,B,C,D,K,X0] = username(PARAMETERS,T,AUX)

           i.e. for any values of the parameters the program
           returns the discrete time state-space matrices.

           AUX is a matrix of auxiliary parameters to be
           used to manipulating the model structure without
           having to rewrite 'username'.
           T is the sampling interval.
           For an underlying continuous-time parametrization the
           conversion to discrete-time should be inhibited if T<0.
           That is, "if T>0, [a,b]=c2d(a,b,T);end" should be used
           in 'username'. (c2d here is a function that transforms from
           continuous to discrete time.) This feature is utilized in
           PRESENT, TH2SS, TH2FF, TH2ZP and several other routines.

Listing of script ssmodel

%   L. Ljung
%   Copyright (c) 1986-98 by The MathWorks, Inc.
%   $Revision: 2.3 $  $Date: 1997/12/02 03:44:26 $