Using equation from curve fitting toolbox as transfer function
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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 ?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/168501/image.jpeg)
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Accepted Answer
Birdman
on 20 Oct 2017
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.
4 Comments
Birdman
on 20 Oct 2017
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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