want to plot ellipses with different a and b values in x^2/a^2 + y^2/b^2 = 1 in Matlab 3d plot

would like to plot x^2/a^2 + y^2/b^2 = R^2 in 3D space for different values of R2

[Saran P]

Yes....in the x,y and R2 axes...something like elliptical paraboloid...

Answer 1

[Matt J]

Simplie enough.

a=0.1;b=0.15;

fsurf(@(x,y) x.^2/a^2+y.^2/b^2) ; 

Answer 2

[Torsten]

a = 0.1;
b = 0.15;
f = @(x,y,R) (x/a).^2 + (y/b).^2 - R.^2;
fimplicit3(f)