draw a sphere in matlab

To draw a sphere in MATLAB, you can use the built-in function sphere. Here is an example code:

main.m
% set the radius of the sphere
r = 5;

% set the number of points to create the sphere
npoints = 30;

% create the sphere
[x, y, z] = sphere(npoints);

% scale the sphere by the radius
x = r * x;
y = r * y;
z = r * z;

% plot the sphere
figure;
surf(x, y, z);
axis equal;
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In this code, we first set the radius of the sphere and the number of points to create the sphere. We then use the sphere function to create the sphere, and scale it to the desired radius. Finally, we plot the sphere using the surf function, and set the aspect ratio to be equal along all three axes using the axis equal command.