MATLAB: Invalid expression when i click run

invalid expression

I havent had to use matlab before. When i type out the code I was given it won't run because of an invalid expression. i can't figure out my mistep
 close all
clear all
t=0;
theta0=pi()/3;
L=.5;
lam=6;
for n=1:161
    t(n+1) =t(n)+.02;
    theta(n)=theta0*sin(lam*t(n));
    omega(n)=lam*theta0*cos(lam*t(n));
    alpha(n)=-lam^2*theta(n);
    xA(n)=t(n);
    yA(n)=t(n)^(3)/18;
    xB(n)=xA(n)+L*sin(theta(n));
    yB(n)=yA(n)-L*cos(theta(n));
    uA(n)=1;
    vA(n)=t(n)^(2)/6;
    uB(n)=uA(n)+L*omega(n)*cos(theta(n));
    vB(n)=vA(n)+L*omega(n)*sin(theta(n));
    axA(n)=0;
    ayA(n)=t(n)/3;
    axB(n)=L*alpha(n)*cos(theta(n))-L*omega(n)^2*sin(theta(n));
    ayB(n)=ayA(n)+L*alpha(n)*sin(theta(n))+L*omega(n)^2*cos(theta(n));
end;
for n=1:161
    line([xA(n) xB(n)]),[yA(n) yB(n)]);
end

Best Answer

   t=0; 
   theta0=pi/3; %error was NOT here
   L=.5; 
   lam=6; 
   for n=1:161 
       t(n+1) =t(n)+.02; theta(n)=theta0*sin(lam*t(n)); 
       omega(n)=lam*theta0*cos(lam*t(n)); alpha(n)=-lam^2*theta(n); 
       xA(n)=t(n); 
       yA(n)=t(n)^(3)/18; 
       xB(n)=xA(n)+L*sin(theta(n)); 
       yB(n)=yA(n)-L*cos(theta(n)); 
       uA(n)=1; 
       vA(n)=t(n)^(2)/6; 
       uB(n)=uA(n)+L*omega(n)*cos(theta(n)); 
       vB(n)=vA(n)+L*omega(n)*sin(theta(n)); 
       axA(n)=0; 
       ayA(n)=t(n)/3; 
axB(n)=L*alpha(n)*cos(theta(n))-L*omega(n)^2*sin(theta(n)); 
ayB(n)=ayA(n)+L*alpha(n)*sin(theta(n))+L*omega(n)^2*cos(theta(n)); 
 end; 
       line(xA, xB,'r') %error was here

       hold on
       line(yA,yB','g') %error was here
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