MATLAB: Plotting 3D for three columns of data

3dsurface

I want to do a 3D plot based on 3 columns of data (X,Y and Z) . X column show positions, y column show speed and z column show emissions. So the result will shows emissions as colors on x(position)-y(speed) axis. Now I have this in 3D but I want a surface output with colours as emission value.

Best Answer

How about using scatteredInterpolant function?

The following is an example:

D = xlsread('LMS.xlsx');
F = scatteredInterpolant(D(:,1),D(:,2),D(:,3));
[xq,yq] = meshgrid(linspace(0,3,20),linspace(0,45,20));
zq = F(xq,yq);
figure
surf(xq,yq,zq)
hold on
scatter3(D(:,1),D(:,2),D(:,3),'r','filled')
colorbar

Related Solutions

MATLAB: 2D color or surface plot based on 3 columns of data

Ideally you should have a perfect grid and them you can do this kind of plot. In your case, however, you have only scattered values and some grid points are outside your domain, which means that to plot the whole domain you would have to extrapolate the data and even get very wrong results.

A better solution is to interpolate only between the points you have and then plot the result. You can do this by first triangulating the points and the use the trisurf function to do the plot. An example code can be seen below:

A = xlsread('LMS.xlsx');
T = delaunay(A(:,1),A(:,2)); % Triangulation
trisurf(T,A(:,1),A(:,2),A(:,3))
xlabel('x')
ylabel('y')
colorbar
shading interp
view(2)

MATLAB: Create 4D surface plot from x, y, z and c column vectors

scatteredInterpolant or TriScatteredInterp. Then evaluate at a regular grid. Then you can isosurface() or slice()

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Related Solutions

MATLAB: 2D color or surface plot based on 3 columns of data

MATLAB: Create 4D surface plot from x, y, z and c column vectors

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