plotting sphere and rectangle mesh

need help on plotting something like this :

any idea ?

Answer 1

[Azzi Abdelmalek]

sphere(20)
axis square

You can get the coordinates x,y and z

[x,y,z]=sphere(20)

You can plot a sphere

surf(x,y,z)

[cob]

thank but it is not the same figure.

[cob]

i do know ho to plot the sphere , i dont know how to plot this black square inside this sphere

[Azzi Abdelmalek]

ii=-1:0.1:1
jj=-1:0.1:1
[ii1,jj1]=meshgrid(ii,jj)
surf(ii,jj,zeros(size(ii1)))
hold on
sphere(20)

[cob]

Thanks a lot , i did a little modification base on your code : x = -2:0.1:2;

y = -2:0.1:2;

[X,Y] = meshgrid(x,y);

surf(x,y,zeros(size(X)),'Facecolor','black');

hold on

sphere(25);

axis square

legend('the square',' the ball of 20','Location','SouthWest');