How to use a cloud of points to interpolate the value at a given point?

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Tyler
Tyler 2018-10-24
评论： Tyler 2018-10-25
I have a point cloud matrix A with columns 1,2,3,4 equal to X,Y,Z (locations) and Value
I have a point B (xq,yq,zq) that i want to evaluate using the point cloud A.
I have tried using
vq = griddata(A(:,1),A(:,2),A(:,3),A(:,4),B(1),B(2),B(3))
with the error: ??? Error using ==> griddata at 72 METHOD must be one of 'linear','cubic','nearest', or 'v4'.
and vq = griddata(A(:,1),A(:,2),A(:,3),A(:,4),B(1),B(2),B(3),'linear') with the error: ??? Error using ==> griddata Too many input arguments.
i tried creating vectors for the query point (B), where i just filled below with some zeros to see if that would work, but it did not.
Any idea how i can accomplish this? Is griddata the right function?

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回答（1 个）

John D'Errico
John D'Errico 2018-10-24
编辑：John D'Errico 2018-10-24
You were close.
griddata is there for problems of the form z(x,y), thus two independent variables. You have three. That is why griddata gave a hiccup, since you tried to pass in too many arguments.
Use scatteredInterpolant instead, a function designed to work on higher dimensional problems.
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Tyler
Tyler 2018-10-25
Is scatteredInterpolant available in 2010b, or does it require an additional license / toolbox? I tried to use it without success

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