Fitting 3d data

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Bhar_tex
Bhar_tex 2018-3-1
评论： Torsten 2018-3-1
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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回答（1 个）

Torsten
Torsten 2018-3-1
I suggest you interpolate directly from the data:
https://de.mathworks.com/help/matlab/ref/scatteredinterpolant.html
Best wishes
Torsten.
  2 个评论
Bhar_tex
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
Torsten 2018-3-1
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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