a<- 50  
> p1<-20
> p2<-30  
> c1<-5  
> c2<-6  
> em<-3  
> en<-2  
> e1<-1  
> e2<-2
> d<-12  
> pc<-1  
> θ<-0.5   
> E<-1000  
> r<-0.01
> B<-seq(0,4000,len = 65)
> u1=35
> u2=15
> Y11<-{(B-c2*(u2+d*((1+θ)*e2-θ*e1)))*p2*c1*((1+θ)*e1-θ*e2)+p1*c2^2*((1+θ)*e2-θ*e1)*(u1+d*((1+θ)*e1-θ*e2))}/(p1*c2^2*((1+θ)*e2-θ*e1)+p2*c1^2*((1+θ)*e1-θ*e2))
> Y21<-{B-c2*(u2+d*((1+θ)*e2-θ*e1))-c1*(u1+d*((1+θ)*e1-θ*e2))}*p1*c2*((1+θ)*e2-θ*e1)/{p1*c2^2*((1+θ)*e2-θ*e1)+p2*c1^2*((1+θ)*e1-θ*e2)}               
> plot(B,y11,type = "l",ylim = c(0, 10000),col = "black",lty = 1)
Error in xy.coords(x, y, xlabel, ylabel, log) :
  'x' and 'y' lengths differ
哪里出了问题