nyquist plot from frequency response data

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Aneesh Vasudev 2018-3-10

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评论： Star Strider 2018-3-10

Hi all,

I have a complex vector containing the response of a particular system to frequencies, given in another vector. How do make a bode plot? If I use the nyquist() function, I get the following warning message.

The numerator or denominator of this transfer function has complex-valued coefficients.

Therefore, I'm really not sure if the plot is correct or not.

Thanks

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Star Strider 2018-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/387529-nyquist-plot-from-frequency-response-data#answer_309434

See the documentation on Data Preparation (link) for the System Identification Toolbox.

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Aneesh Vasudev 2018-3-10

Thanks. used frd().

Star Strider 2018-3-10

As always, my pleasure.

I was not certain what option would be best for your data.

I recently solved a similar problem in How can ı get transfer function (link). That code may save you some time if you want to do something similar.

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