How to Fit Tabular Data

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Christopher Dottellis 2021-1-19

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回答： Nitin Kapgate 2021-2-9

I have a table with two variables, x and y. For each x,y pair there is a z.

I'm trying to find a two variable function that can represent this table. I have been trying to use fit() but it says that the format of my vectors is off. So I did the example and looked at the three vectors loaded in.

load franke;
surffit = fit([x,y],z,'poly23','normalize','on')

I find that the vectors , x, y, and z are all the same dimension. However, in my mind z = f(x,y) should be a matrix of values with dimensions size(x) by size(y). What is this fit function actually fitting then?

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Christopher Dottellis 2021-1-19

To clarify, this data is sparse. Might it just be easier to create the function by hand?

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Answer 1

Nitin Kapgate 2021-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/720574-how-to-fit-tabular-data#answer_618837

'z' vector should be of the same size as 'x' and 'y' vectors. The fit function tries to approximately fit a curve or surface to the data using different fitting techniques (fit type) etc.

You can refer to this example that demonstrates how to fit a surface using variables in a MATLAB Table.