Curve Fitting a Transfer Function

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Michael Harris
Michael Harris 2015-7-13
评论： Michael Harris 2015-7-14
I have a transfer function in the frequency domain and I am looking to curve fit it into a numerator and a denominator for a system. Is there a specific function that I can use to do so if there are both poles and zeros in the transfer function? I have the standard student version toolboxes as well as the system ID toolboxes.

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Sebastian Castro
Sebastian Castro 2015-7-14
In System Identification Toolbox, there is a "tfest" function. Notice that one way to call it is by specifying the data, as well as the number of poles (np) and zeros (nz):
http://www.mathworks.com/help/ident/ref/tfest.html
http://www.mathworks.com/help/ident/ug/how-to-estimate-transfer-function-models-at-the-command-line.html
>> sys = tfest(data,np,nz)
- Sebastian
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Michael Harris
Michael Harris 2015-7-14
Thank you Sebastian. I had attempted to use the tfest command previously and the system that I was getting was not even close to a good approximation of my transfer function. The system I was given was just an exponential decay function with no distinct poles or zeros. Do you have any suggestions as to how I can get the tfest command to give me better results?

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