MATLAB: How to mark a location on the X-Y plane while using surf

plotsurf

I am using surf to plot heat diffusion. I would also like to mark the location of the point source in the X-Y plane. I have tried using the 'plot' function with 'hold on' to mark the location with an 'x', then surf the heat, but my x's don't show up in the graph when I'm done. Is there a nice way to do both? Thanks!

Best Answer

To plot a specific point on a surf plot, you have to use hold, then use another 3D plotting routine to mark the plot the way you want to. Possibilities are: scatter3, stem3 (both my choices for the options they offer), as well as plot3.

The 2D plot function will put the z-value at zero.

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load(websave('data.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/508797/data.mat'))
Z(Z==0)=nan;
ax = surf(X,Y,Z,temp); colormap((hot(30))); colorbar;
caxis([mean(temp,'all','omitnan')-2.5*std(temp,[],'all','omitnan') mean(temp,'all','omitnan')+2.5*std(temp,[],'all','omitnan')]);
ax.LineStyle = 'none';ax.EdgeColor = 'flat';ax.FaceColor = 'flat';
xlim([-70 70])
ylim([-70 70])
zlim([-30 30])

Best Answer

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