Define a new fitting function
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Hello everyone!
I need to define a new fitting function that is not in the matlab library. I've already tried to use the "fit App" but then I wasn't able to save the function and so re-use it. Now I'm trying in this way but it doesn't work.
model_1 = fittype('a*netOD_red+b*(netOD_red)^3','independent','netOD_red','dependent','dose')
fit_model_1 = fit(netOD_red, dose, model_1)
where my X vector is "netOD_red" and my Y vector is "dose".
The function I want to use is Y= a*X+b*(X)^3
Can someone help me? Thank you
2 个评论
Steven Lord
2019-5-14
Can you clarify what "it doesn't work" means?
Does MATLAB throw an error? If so what is the full and exact text of the error message you receive -- all the text displayed in red?
Does MATLAB issue a warning? If so what is the full and exact text of the warning message you receive -- all the text displayed in orange?
Does MATLAB give you a different result than you expected? If so can you show us a (small) data set and the code you use to obtain the answer (the code in your original message only shows how you created the fit -- show us how you used that fit to get the numeric result) and explain what you expected?
This information may help us understand what went wrong and/or what you're trying to do.
Ilaria Pintus
2019-5-15
采纳的回答
Steven Lord
2019-5-15
1 个投票
Is your data stored as row vectors? If so, transpose them (using the .' operator) to be column vectors in your call to fit.
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