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- %THETA(SS) A structure for defining general linar state-space models
- %TH is a matrix that contains information about a model structure in
- %coded form. The THETA(SS)-structure is used by the commands PEM, TH2ARX,
- %TH2PAR, TH2SS, IDSIM, PRESENT, THINIT, FIXPAR, UNFIXPAR, TH2TF.
- %It is created by the commands MS2TH, MF2TH, ARX, IV4 and ARX2TH, and
- %it is modified by the commands PEM, THINIT, FIXPAR and UNFIXPAR
- %The first row of THETA(SS) contains in order, [determinamt of innnovations
- %covariance, sampling interval, # of inputs, # of outputs, # of estimated
- %parameters, size of auxiliary argument(1|2),name of m-file that
- %generates the state space models]
- %The second row contains: [Akaike's FPE criterion,date & time when
- %generated,command by which generated, coded number for cont/discr model]
- %The third row contains the values of the nominal (estimated) parameters.
- %The next d rows contains the covariance matrix of the parameters.
- %Below this we have the auxiliary arguments, used by the m-file that
- %generates the structure, and finally, the bottom left contains the
- %covariance matrix of the innovations.
- %The THETA-format is unpacked by
- %PRESENT: writes the information on the screen
- %TH2SS, TH2TF, TRF, ZP: gives the state-space matrices, transfer functions,
- % freq function and zeros/poles
- %TH2PAR: returns the nominal parameters and their covariance matrix
- %TH2ARX: gives the matrices of an ARX-representation
-