how can I creat a circle in 2 dim and 3 dim?

how can I creat a circle in 2 dim and 3 dim like this:

I need to write a function that gets 2 radious and back those plot.

[Torsten]

https://de.mathworks.com/matlabcentral/answers/95230-how-do-i-plot-a-toroid-in-matlab

[Dan Kanyas]

thank you!

Answer 1

[DGM]

You can always try this:

https://www.mathworks.com/matlabcentral/fileexchange/58413-plot-superquadratic-surfaces

These are convenient tools with syntax similar to ellipsoid() or sphere(). The output is a set of matrices that can be fed directly to surf() or mesh(). These are fully generalized and support independent axis orders. For a simple circular toroid with circular section:

center = [0 0 0];
radius = [1 1 1 3];
order = [2 2]; 
npoints = 100;

[x y z] = supertoroid(center,radius,order,npoints);
surf(x,y,z)
shading flat
axis equal
colormap(parula)
view(-16,27)
camlight

or for a toroid with superelliptic profile and section:

radius = [1 1 2 3];
order = [5 3];