Surface plot generation for a 3-variable function

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Manu M
Manu M 2019-4-8
回答： VBBV 2023-6-3
Greetings, Could you please advise how to generate a surface plot for a 3- variable function. (The meshgrid and function are working properly but the surf() function keeps throwing out error and no graph appears)
u=1000:4:3000;
v=400:1.6:1200;
w=0.25:0.001:0.75;
[x,y,z]=meshgrid(u,v,w);
g=x*x+y*y-z*z;
surf(u,v,g)
Thanks!
Also Could you let me know how to plot surf(u,w,g) and surf (v,w,g) in separate graphs.

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回答（2 个）

Walter Roberson
Walter Roberson 2019-4-8
surf can only be used for rectangular (2d) data arrays.
For 3d data arrays your choices include
  • isosurface
  • slice
  • volumeviewer or underlying functionality can be called directly in very recent releases
  • vol3d v2 from File Exchange
  • scatter3 and encode the value by color or size
VBBV
VBBV 2023-6-3
Ran in:
Try to use a for loop to plot the resulting expression in 3rd dimension as shown below since surf function plots 2D matrices only
u=100:5:300;
v=40:1.6:120;
w=0.25:0.1:0.75;
[x,y,z]=meshgrid(u,v,w);
g=x.^2+y.^2-z.^2;
hold on
for k = 1:length(size(z,3))
surf(u,v,g(:,:,k))
end
colorbar
shading interp
view(3)
grid

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