求大神指点啊。。。

%r=1,s=6,K=2,L=4,b=1/5,c=7/20
[url]http://%f1=@(m,n)m*(1-m/2)-(1/5)*m*n[/url]
[url]http://%f2=@(m,n)n*(1-n/2)-(7/20)*m*n[/url]
[url]http://f=@(m,n[/url]) [m*(1-m/2)-1/5*m*n n*(1-n/2)-7/20*m*n];
a=0;b=50;N=1000;h=0.05;
y(1,:)=[1 1];
for i=2:N+1
y(i,:)=y(i-1,:)+h.*f(y(i-1,1),y(i-1,2));
%y(i,1)=y(i-1,1)+h*f(y(i-1,1),y(i-1,2))
%y(i,2)+y(i-1,2)+h*f(y(i-1,1),y(i-1,2))
x(i,:)=y(i-1,:)+h.*f(y(i,1),y(i,2));
end
plot(x(:,1),x(:,2))
twoSpecComp
Subscripted assignment dimension mismatch.
Error in twoSpecComp (line 6)
y(1,:)=[1 1];