# Time-domain identification algorithm

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• #853
Ecook
Guest

Dear Aleksei,
Thank you for designing such a wonderful toolbox. Could you please tell how to choose between all the methods used in fotfid? There are many options in the time-domain identification tool, such as free identification, fix exponents etc, but the documentations or literatures are not found. Would you kindly show me the titles of the identification algorithms?
Thank you very much!

#855
Aleksei
Keymaster

The choice of options depends on the identification problem. Kindly consider this excerpt from the old documentation: https://fomcon.net/pub/temp_docs/fotfid_tool.pdf

In short: What type of model would you like to obtain? You can try obtaining a model with a commensurate order, in which case the model generation panel and “fix exponents” option may be useful. You can also identify integer-order models by fixing exponents with $\alpha_k, \beta_k\in\mathbb{Z}^{+}$.

The identification process involves constrained optimization, where the objective function is based on the model’s output error (see MATLAB’s Optimization toolbox documentation for lsqnonlin). That is, the output error is minimized in the least squares sense.

• This reply was modified 6 years, 11 months ago by Aleksei.
• This reply was modified 6 years, 11 months ago by Aleksei.
• This reply was modified 6 years, 11 months ago by Aleksei.
#866
Ecook
Guest

Thank you for your reply. Looking forward to more features in FOMCON toolbox

#868
Aleksei
Keymaster

You are welcome. Should you have a feature request for the toolbox feel free to file it. I will then take it into consideration for the next release.

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