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Nonlinear material model fit

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Hello there,
I have a few model functions, for example: y=2(x^2-1/x)(C1+C2/x).
I need to fit the parameters for a table of tension test data.Also, i would like to use different error functions, not just least root means square. How can i solve that?
Don't even know how to go about it.


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Accepted Answer

Image Analyst
Image Analyst on 22 Nov 2019
fitnlm() is one of my favorite MATLAB functions. See my attached demos where I use fitnlm() to fit a variety of different functions. I think you'll be able to figure out how to make changes. If you can't, then attach some sample data and I'll modify the demo for you.


Kálmán Németh
Kálmán Németh on 22 Nov 2019
Thank you, however i have some questions.
Can i somehow prescribe for the parameters to be positive values or between some value? Also can i modify the error function used in this method?
Image Analyst
Image Analyst on 23 Nov 2019
If you can, I don't know how.

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