Can I use different models to do a 2D fit?

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Jaime De La Mota Sanchis 2021-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/1464504-can-i-use-different-models-to-do-a-2d-fit

回答： Matt J 2021-10-1

采纳的回答： Matt J

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Hello everyone. I am currently working in a two-dimensional interpolation.

I can write

sfX = fit([positions(:,1), positions(:,2)],windX_in_the_node_vector,'poly34')

witout any issue. However, if I check the documentation, I see that the only other surface fit that can be used is 'lowess'. Is this true or can I use splines or other alternative interpolation methodologies?

Best regards.

Jaime.

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Answer 1

Matt J 2021-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/1464504-can-i-use-different-models-to-do-a-2d-fit#answer_799334

Yes, but you don't need the Curve Fitting Toolbox just tod surface interpolation. With interp2 (if you have gridded data) you can use any of the ones listed here,

https://www.mathworks.com/help/matlab/ref/interp2.html#btyq8s0-1-method

If you have scattered samples, then with griddata, you can use any of the methods here,

https://www.mathworks.com/help/matlab/ref/griddata.html#bvkwume-method