Using equation from curve fitting toolbox as transfer function

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RAN
RAN 2017년 10월 20일
댓글: Birdman 2017년 10월 20일
Hello,
I think this question has been asked multiple times in different ways, but I still could not find the answer to my problem. I have a numerical dataset x and y, where y/x = transfer_function. Using curve fitting toolbox I plotted the y vs x. Using the spline function I have a good fit to the data. Now transfer_function in this case is spline function. I would like to use this function as a transfer function in my Matlab script such that change in x values should give me corresponding y values. How do I use the output of cftool as a transfer function ?
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Birdman
Birdman 2017년 10월 20일
Can you share the x and y datas as a mat file?
RAN
RAN 2017년 10월 20일
Unfortunately I cannot share the data files. But as you can see that there is a function for f(x) in the results pane. I am just not sure how to use that as a transfer function in my matlab script.

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Birdman
Birdman 2017년 10월 20일
To use it as a transfer function, you need to obtain a model from input/output data. To do that, you can use the SYSTEM IDENTIFICATION TOOLBOX, where you can obtain a model in s-domain at a order that you define. That is the only way I can help.
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RAN
RAN 2017년 10월 20일
the 'untitled fit 1' is the data in variable f
Birdman
Birdman 2017년 10월 20일
If we talk about a transfer function, than it has to be in s-domain. The f variable behaves like a equation which firs the IO data.

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