3D plot of an ellipsoid

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Hi, I have to plot the following function on a 3d graph, it should be an ellipsoid. theta_ is a 1x3 vector and COV a 3x3 matrix
RC=@(x,y,z) (theta_-[x y z])*inv(COV)*(theta_-[x y z])'-5;

Accepted Answer

John D'Errico
John D'Errico on 12 Oct 2021
Edited: John D'Errico on 12 Oct 2021
theta_ = [1 2 3];
COV = cov(rand(10,3)); % picking some arbitrary values for theta_ and COV...
RC=@(x,y,z) (theta_-[x y z])*inv(COV)*(theta_-[x y z])'-5;
fimplicit3(RC)
Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.
axis equal
box on
xlabel x
ylabel y
zlabel z

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