Remove a "plane" from my 3d plot
10 views (last 30 days)
Show older comments
When I plot the surface it results into the surface itself but there is something weird in the middle of the surface, I mean it's kind like it is in the xy plane, I do not know how to remove it, here is my code:
clear
figure, hold on
[x,y]=meshgrid(-50:50)
xlabel ("x");
ylabel ("y");
zlabel ("z")
z=sqrt(9*(y.^2)-9*(x.^2))
w=-sqrt(9*(y.^2)-9*(x.^2))
surf(x,y,real(z))
surf(x,y,real(w))
zlim([-150,150])
3 Comments
Ravi Narasimhan
on 14 Oct 2021
Edited: Ravi Narasimhan
on 14 Oct 2021
You could perhaps set any value of real(z) or real(w) = 0 to NaN (Not a Number) using the find function. Those items wouldn't display on the surface plot, leaving a space between the top and bottom halves. It would look like
z(find(real(z) == 0)) = NaN;
The find function returns the indices where real(z) == 0 and the z(find(...)) = NaN sets those positions in the z array to NaN
You'd tweak it accordingly for w.
Accepted Answer
DGM
on 14 Oct 2021
You could try to clip off the excess points with NaN and be left with a gap in the surface at the joint, or you could just avoid the problem entirely.
Consider this:
N = 50;
th = linspace(0,2*pi,N);
r = linspace(-50,50,N).';
[x z y] = pol2cart(th,r,r);
z = z*3; % your example stretches on z
h = surf(x,y,z);
set(h,'facealpha',0.8,'edgealpha',0.5)
axis equal
xlabel ("x");
ylabel ("y");
zlabel ("z")
0 Comments
More Answers (0)
See Also
Categories
Find more on Surface and Mesh Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!