How can I perform multivariable polynomial curve fitting?

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Karen Hejazi 2021-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/876168-how-can-i-perform-multivariable-polynomial-curve-fitting

回答： Matt J 2021-7-11

Hey!

I am looking to perform a polynomial curve fit on a set of data so that I get a multivariable polynomial.

I have successfully been able to fit a curve on 2 independent variables using curve fitiing tool. In my case, that was "efficiency as a function of flow rate and head."

I want to be able to perform a fit that gives me a function for something like, "efficiency as a function of flow rate, head and angle." Any ideas?

Thank you!

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Karen Hejazi 2021-7-11

i mean that now i have 3 independent variables.

Scott MacKenzie 2021-7-11

You can't use the curve fitting tool to build a model with >2 independent variables. But, see this ANSWER for an alternative approach (which I haven't tried but looks reasonably simple).

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