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Why doesn't my state-space model iterate?

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João Luís Agostinho Soares Pinto
评论： Star Strider 2022-5-18
I am trying to obtain a State-Space model utilizing the function ssest and having a previous model (sys901_0N) as an initial one. When I run the code, although the number of iterations is set to 100 it only runs through it once, obtaining the same model as the inital one that was set.
How could I overcome this?
ssest = ssest(h,sys901_0N,opt)
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João Luís Agostinho Soares Pinto
João Luís Agostinho Soares Pinto 2022-5-18
h is already defined, it is a set of measurements.
H.H is my y measurement and H.f is my x measurement in frequency
h=idfrd(H.H,H.f,0,'FrequencyUnit','Hz');

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回答（1 个）

Star Strider
Star Strider 2022-5-18
The iterations are defined inside the function. See the documentation section on Display to see the progress of the estimation.
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  2 个评论
João Luís Agostinho Soares Pinto
João Luís Agostinho Soares Pinto 2022-5-18
I have the display option but it appears me "Termination condition: No improvement along the search direction with line search.." and I don't know what could be provoking this
Star Strider
Star Strider 2022-5-18
The previous system you are using to define the new system cannot be improved upon, at least with respect to the conditions the algorithm uses.
Frequency response (idfrd) estimations are more limited in the available options and results than time-domain (iddata) estimates.

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