how to create a state-space model without disturbance

Kshitij Singh answered . 2025-06-30 19:47:10

The difference between the output of the model and the actual (measured) output is, in general, not going to be zero. So, there will be an error e such that:

 e = ymeasured-ymodel,

where

 ymodel = Cx + Du

which means:

 ymeasured = Cx + Du + e

When you set K = 0 in the idss model, the parameters you get by minimizing |e||| are the ODE coefficients you are interested in. Furthermore, using

 [A, B, C, D] = ssdata(model)

you can extract out the state-space coefficients of the output-reproducing model: xdot = Ax + Bu; y = Cx+du

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