How to make my surface plot have symmetric centre in origo?

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Aldo
Aldo 2017-6-28
编辑： Aldo 2017-6-28
I have a code(I think it's easier to see what I mean if you plot it):
% Convex
N = 100; % Even number of points
H = 0.02; % Height.
[x,y,z] = cylinder(-0.02:0.02,N);
x = x(:,1:ceil(N/2)+2);
x(:,end) = x(:,1);
y = y(:,1:ceil(N/2)+2);
y(:,end) = y(:,1);
y=y+(0.02+0.001); % Distance from z=0
z = -z(:,1:ceil(N/2)+2);
z(:,end) = z(:,1);
z(2,:) = -z(2,:)*H;
surf(x,z,y)
hold on
%concave
N = 100;
H = 0.02;
[x,y,z] = cylinder(-0.02:0.02,N);
x = x(:,1:ceil(N/2)+2);
x(:,end) = x(:,1);
y = y(:,1:ceil(N/2)+2);
y(:,end) = y(:,1);
y=y+(0.02+0.001);
z = z(:,1:ceil(N/2)+2);
z(:,end) = z(:,1);
z(2,:) = -z(2,:)*H;
surf(-x,-z,-y) % Difference concave/convex
axis equal
ylim([-0.04 0.04])
xlim([-0.04 0.04])
zlim([-0.04 0.04])
xlabel('x')
ylabel('y')
zlabel('z')
hold off
How can I make this centre in the middle of the y-axes, and grow in both directions if I change the height("H")?
Any tips are greatly appreciated!

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