How to convert y data for equal intervals of x, z to z data for equal intervals of x, y
显示 更早的评论
x and z are tables of size 100x100 using meshgrid.
Values outside the required range of z are treated as NaN.
The y value is the result of the calculation using x and z.
If the result of the calculation for z is a complex number, NaN is processed.
What code should I use to find z for equally spaced x, y?
An error occurs when trying to do 3D interpolation.
I attached the variable as an attachment.
I would greatly appreciate your help.
1 个评论
Madheswaran
2024-11-12
@Yunjai Could you also post the minimal version of code you were trying to run and the error you were facing?
采纳的回答
Rescaling is important when doing scatering interpolation. Avoid unstable extrapolation
load example.mat
XYZ = [X(:), Y(:), Z(:)];
XYZ = rmmissing(XYZ,1);
[minx, maxx] = bounds(X, "all");
[miny, maxy] = bounds(Y, "all");
XN = (XYZ(:,1)-minx)/(maxx-minx);
YN = (XYZ(:,2)-miny)/(maxy-miny);
F = scatteredInterpolant(YN, XN, XYZ(:,3) , 'linear', 'none');
[XNG, YNG] = deal(linspace(0, 1));
ZG = F({YNG, XNG});
XG = minx + XNG*(maxx-minx);
YG = miny + YNG*(maxy-miny);
figure
surf(XG, YG, ZG);
shading interp
hold on
contourf(XG, YG, ZG, 'Zlocation',-1.3)
colorbar
plot3(X(:),Y(:),Z(:),'.b')
view(15,50)
1 个评论
Bruno Luong
2024-11-12
移动：Bruno Luong
2024-11-12
If you want exptrapolation I recommend using either the legacy griddata 'v4' or John d'Erric Inpaint_NaNs
更多回答（1 个）
load example.mat
XYZ = [X(:), Y(:), Z(:)];
XYZ = rmmissing(XYZ,1);
F = scatteredInterpolant(XYZ(:,1), XYZ(:,2), XYZ(:,3));
[minx, maxx] = bounds(X, "all");
[miny, maxy] = bounds(Y, "all");
[XG, YG] = ndgrid(linspace(minx, maxx), linspace(miny, maxy));
ZG = F(XG, YG);
surf(XG, YG, ZG);
shading interp
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