Hello, I have been trying to surf two parallel circles but data dimensions don't match and I don't know why. Any help would be nice. Thank you, Omar

radius = 1; center = [0 0]; theta = linspace(0,2*pi); X = center(1)+radius.*cos(theta); X=[X;X]; Y = center(2)+radius.*sin(theta); Y=[Y;Y]; Z = zeros(size(X));Z=[Z;Z];Z(2,:)=1;surf(X,Y,Z); hold on;

Answer 1

[elias GR]

Furthermore, surf is not the right command to do what you want. Try the following instead:

fill3(X(1,:),Y(1,:),Z(1,:),'r')
hold on
fill3(X(2,:),Y(2,:),Z(2,:),'b')

[Omar Rashed]

Thanks, I realised surf was wrong as well after it gave me a hollow cylinder. But I didn't get two circles when I used your answer, it gave me one, even after correcting the last line

[Omar Rashed]

Never mind, I found the issue, thank you so much

Answer 2

[Massimo Zanetti]

You doubled Z, delete the

Z=[Z;Z];

line and everything will be fine.

Answer 3

[elias GR]

Erase Z=[Z;Z]; This is not needed because X already have 2 rows and size(X)=[2 100]