Is it possible to create a surface plot from scattered points?
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Good morning,
I find myself with a scatter of x and y points and would like to show them on a graph. The order of the points is random and not defined by a function. I would like to know if there is a code to turn these points into a grid so I can show my graph more clearly.
extracted from my code and current plot
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1055385/image.jpeg)
position_x = Data_x
position_y = Data_y
Von_mises = Data_Von_mises
scatter(position_x, position_y, 1, Von_mises, '.')
colormap ('jet')
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Star Strider
il 6 Lug 2022
Another approach —
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1055560/Datas_xymises.txt', 'VariableNamingRule','preserve')
L = size(T1,1);
xv = linspace(min(T1{:,1}), max(T1{:,1}), fix(L/100));
yv = linspace(min(T1{:,2}), max(T1{:,2}), fix(L/100));
[Xm,Ym] = ndgrid(xv, yv);
Zm = griddata(T1{:,1}, T1{:,2}, T1{:,3}, Xm, Ym)
figure
surfc(Xm, Ym, Zm, 'EdgeColor','none')
colormap(turbo)
figure
surfc(Xm, Ym, Zm, 'EdgeColor','none')
colormap(turbo)
view(0,90)
.
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Più risposte (2)
John D'Errico
il 5 Lug 2022
Modificato: John D'Errico
il 5 Lug 2022
We don't have your data. But there are mltiple solutions you can use.
First is my gridfit. You can download it from the file exchange, for free use. The nice thing is gridfit will take only one line of code, but you would need to download it.
Next, you can use tools like scatteredInterpolant, then interpolating a grid of points through your data set. Compute the lattice of points using meshgrid, then just call scatteredInterpolant.
Again, since I lack your data, I can't show them in use here.
Chunru
il 5 Lug 2022
Modificato: Chunru
il 5 Lug 2022
a= readmatrix("https://www.mathworks.com/matlabcentral/answers/uploaded_files/1055560/Datas_xymises.txt")
whos
position_x = a(:, 1);
position_y = a(:, 2);
Von_mises = a(:, 3);
F = scatteredInterpolant(position_x, position_y, Von_mises);
x1 = min(position_x):0.1:max(position_x);
y1 = min(position_y):0.1:max(position_y);
[xq, yq] = meshgrid(x1, y1);
zq = F(xq, yq);
imagesc(x1, y1, zq)
colormap ('jet')
figure
surf(x1, y1, zq, 'EdgeColor', 'none')
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