Ellipsoid plot_ wireframe view
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Vikas Saroha
el 26 de Ag. de 2019
Comentada: Vikas Saroha
el 26 de Ag. de 2019
Hello, I have plotted ellipsoids using 'surf' command at some fixed points. It looks like solid. But i want to see three axis of it as shown in figure attached. Please suggest.
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Bruno Luong
el 26 de Ag. de 2019
Editada: Bruno Luong
el 26 de Ag. de 2019
[Q,~] = qr(randn(3));
h = rand(3,1);
h1 = h(1);
h2 = h(2);
h3 = h(3);
% If your principal axis are (3x1) P1, P2, P3 and half length are (scalars) h1, h2, h3
% Q = [P1(:), P2(:), P3(:)];
Q = Q .* ([h1, h2, h3]./sqrt(sum(Q.^2,1)));
n = 21;
[x,y,z]=sphere(n);
xyz = Q*[x(:) y(:) z(:)]';
x = reshape(xyz(1,:),[n n]+1);
y = reshape(xyz(2,:),[n n]+1);
z = reshape(xyz(3,:),[n n]+1);
close all
hold on
surf(x,y,z,'EdgeColor',0.6+[0 0 0],'FaceColor','none');
for k=1:3
plot3([0 Q(1,k)],[0 Q(2,k)],[0 Q(3,k)],'r','LineWidth',2);
end
axis equal
This is a slight modification of my answer in this thread
3 comentarios
Bruno Luong
el 26 de Ag. de 2019
Error occuring or not depends on your MATLAB version, this command is correct for R2016b and later.
If you use previous you should replace with
Q = bsxfun(@times, Q, ([h1, h2, h3]./sqrt(sum(Q.^2,1))))
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