Fitting 3d data

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data - Copy.txt

I have a nonlinear 3D data. Can someone help in providing me a function that fits my data? I would like to use that function for interpolation/extrapolation. Appreciate your help.

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Answer 1

Torsten 2018-3-1

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I suggest you interpolate directly from the data:

https://de.mathworks.com/help/matlab/ref/scatteredinterpolant.html

Best wishes

Torsten.

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Bhar_tex 2018-3-1

I am confused how to use function, F (= scatteredInterpolant(x,y,z)) for interpolation. i.e., if I have xnew,ynew and how can I predict corresponding znew using this F?

Torsten 2018-3-1

在 MATLAB Online 中打开

Put your first column in vector x, your second column in vector y and your third column in vector z.

Then call

F = scatteredInterpolant(x,y,z);

For a query point (xq,yq)

zq = F(xq,yq)

gives you the interpolated z-value.

Best wishes

Torsten.

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Fitting 3d data

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