Create 3D Surf from table of data

Question

Camila Gill 2020-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/517640-create-3d-surf-from-table-of-data

回答： Star Strider 2020-4-13

fdm_trainingdata.m

在 MATLAB Online 中打开

Given data attached:

I am trying to create a 3D plot using 'surf' command. Here is my own attempt at the code:

x = trainingdata(:,1);
y = trainingdata(:,2);
[X,Y] = meshgrid(x,y);
z = trainingdata(:,3);
figure(1)
surf(X,Y,z);

Need matrices that are at least 18x18 in size.

I am having trouble with the 'z' term. I am not able to plot it because I don't understand how to format the 'z' matrix. This is the error message shown:

Error using surf (line 71)

Z must be a matrix, not a scalar or vector

Error in fdm_nn_CGill (line 65)

surf(X,Y,z);

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Answer 1

Star Strider 2020-4-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/517640-create-3d-surf-from-table-of-data#answer_425856

在 MATLAB Online 中打开

The data are gridded, so you simply need to use the reshape function to create matrices from them:

[~,ix] = unique(trainingdata(:,1));
rc = mean(diff(ix));
X = reshape(trainingdata(:,1),rc,[]);
Y = reshape(trainingdata(:,2),rc,[]);
Z = reshape(trainingdata(:,3),rc,[]);
figure
surf(layerthick, speed, Z)
grid on
xlabel('Layer Thickness')
ylabel('Speed')
zlabel('Dependent Variable')
view(50,30)