oblate and prolate figs

Please can you help me to plot oblate and prolate ( code of Matlap) as in image

and if you can writen code of x^2/a^2 +y^2/b^2=1, where a^2=5.5 and b^2=7.73

[Rik]

What did you try? I recall there is an example in the documentation.

[Mushtaq Al-Jubbori]

If you can provided me the code

[Rik]

doc sphere

Answer 1

[DGM]

See ellipsoid()

r = [1 1 2]; % radius [x y z]
c = [0 0 0]; % center [x y z]
npoints = 30;

% if no output arguments are requested, a surf plot is created
% otherwise, look at the documentation
ellipsoid(c(1),c(2),c(3),r(1),r(2),r(3),npoints);

colormap(parula)
axis equal

[Mushtaq Al-Jubbori]

very thanks

[Mushtaq Al-Jubbori]

How we can plot in 2D?

[Les Beckham]

doc view

[DGM]

As @Les Beckham says, view() can be used to control the camera position using different methods.

r = [1 1 2]; % radius [x y z]
c = [0 0 0]; % center [x y z]
npoints = 30;

% if no output arguments are requested, a surf plot is created
% otherwise, look at the documentation
ellipsoid(c(1),c(2),c(3),r(1),r(2),r(3),npoints);

colormap(parula)
axis equal

view([0 0 1]) % top-down along Z 

[Mushtaq Al-Jubbori]

please I need as fig

[DGM]

If all you need are 2D ellipses, then this simplifies.

% a and b are equal-length row vectors
a = linspace(2.7,2.3,4); % i'm just picking some numbers similar to the image
b = linspace(3.2,3.8,4);

npoints = 100; % pick a suitable number of points
th = linspace(0,2*pi,npoints);
x = a.*cos(th).';
y = b.*sin(th).';

hp = plot(x,y);
axis equal
grid on

leglabels = {'thing 1','thing 2','thing 3','thing 4'};
legend(hp,leglabels)

[Mushtaq Al-Jubbori]

very thanks