MATLAB绘图 加入条件

MATLAB如何画图，这个限制条件当x=Le时，y=D0/2如何加入到代码中% Define variables:

%input
a = 16.3045;
D0 = 16.3002;
L0 = 2a;
Le=;
%
x = 0:0.1:32.6009;
m = (10L0Le-8Le^2-2L0^2)./(L0^2-2L0Le);
y = (x-L00.5*(2+m)).(L0x-x.^2)./((Le-L00.5(2+m)).(L0Le-Le.^2))D00.5;
plot(x,y);
grid on, axis equal;
axis([-10, 45, -10, 20]);