How would I go about plotting an ellipse?

So I have an ellipse (x^2/9)+(y^2/16)+(z^2/9)=1, how do I go about plotting the surface plot of this?

Answer 1

[Star Strider]

Another approach using https://www.mathworks.com/help/matlab/ref/isosurface.html*|isosurface|* (link):

elpsfcn = @(x,y,z) (x.^2/9)+(y.^2/16)+(z.^2/9); %=1

v = linspace(-5, 5, 150);
[X,Y,Z] = meshgrid(v);

elps = elpsfcn(X,Y,Z);

figure(1)
p = patch(isosurface(X,Y,Z,elps, 1), 'FaceColor','interp');
vn = get(p, 'Vertices');
cmv = colormap(jet(size(vn,1)));
set(p, 'FaceColor','interp', 'EdgeColor','none', 'FaceVertexCData',cmv)
grid on
view(60, 25)
axis equal
xlabel('X')
ylabel('Y')
zlabel('Z')

Answer 2

[Walter Roberson]

syms x y z
eq = (x^2/9)+(y^2/16)+(z^2/9)==1;
fimplicit3(eq);
axis equal