[MATLAB基础] 请教哪里错了？！

[jhfamily]

h=16;
r0=50;
syms s;
ftuicheng=150*pi/180;%推程角
faiyuan=30*pi/180;%远休止角
fhuicheng=120*pi/180;%回程角
faijin=60*pi/180;%近休止角
fai=0i/180:2*pi;
if (fai>=0)&(fai<=ftuicheng)
s=h*((fai/ftuicheng)-(sin(2*pi*fai/ftuicheng)/(2*pi)));
elseif (fai>ftuicheng)&(fai<=(ftuicheng+faiyuan))
s=16;
elseif (fai>(ftuicheng+faiyuan))&(fai<=(ftuicheng+faiyuan+fhuicheng))
s=h-10*h*(fai-ftuicheng-faiyuan).^3/(fhuicheng)^3+15*h*(fai-fuicheng-faiyuan).^4/(fhuicheng)^4-6*h*(fai-ftuicheng-faiyuan).^5/(fhuicheng)^5;
elseif (fai>(ftuicheng+faiyuan+fhuicheng))&(fai<=2*pi)
s=0;
end
x=(r0+s).*sin(fai);
y=(r0+s).*cos(fai);
plot(x,y,'linewidth',2)
title('凸轮轮廓')
xlabel('mm')
ylabel('mm')
axis equal

??? Error using ==> plot
Not enough input arguments.