Remove a "plane" from my 3d plot
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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 commentaires
Ravi Narasimhan
le 14 Oct 2021
Modifié(e) : Ravi Narasimhan
le 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.
Réponse acceptée
DGM
le 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")
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