Initial condition estimation using tfest

Question

Maryam Abdollahi 2021-3-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/763236-initial-condition-estimation-using-tfest

评论： Maryam Abdollahi 2021-3-10

Hi,

I am trying to find initial condition information using tfest estimation. However, once I use "[sys_tf,ic] = tfest(data,np,nz);" I will get the error:

Error using tfest

Too many output arguments.

The given example in https://www.mathworks.com/help/ident/ug/apply-initial-conditions-when-simulating-identified-LTI-Models.html cannot be run either.

I cannot find the problem. I appreciate if anyone can help.

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Answer 1

Sindhu Karri 2021-3-9

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/763236-initial-condition-estimation-using-tfest#answer_642891

编辑：Sindhu Karri 2021-3-10

The output parameter for tfest function is sys till R202a and from R202b it has sys and ic as its output parameters.This difference in output arguments is causing the error. To fix it , upgrade to MATLAB latest version. Refer to below link to upgrade MATLAB

https://www.mathworks.com/help/install/ug/upgrade-matlab-release.html

Refer to below help document links of tfest function in R2020a and R2020b versions for better understanding

R2020a

R202b