求大虾们帮忙改正下matlab解方程程序错误

%设:
%y1=y
%y2=y'
%函数文件如下：
%%%%%%%%%%%%my_function.m%%%%%%%%%%%%%%%%%%%
function dy=my_function(t,y)
dy=zeros(2,1);
dy=[y(2);104*sin(pi*t/5)-201*y(1)/(1+10.6*sin(pi*t/5)*sin(pi*t/5))];
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear
ts=0:0.01:10;%范围
y0=[0,0];
[t,y]=ode45('my_function',ts,y0);
plot(t,y(:,1));
运行后出现：
?? Input argument "y" is undefined.

Error in ==> exam2_solve at 8
dy=[y(2);104*sin(pi*t/5)-201*y(1)/(1+10.6*sin(pi*t/5)*sin(pi*t/5))];

>> 该如何做呀？急用，大侠们速度帮下呀，先谢了！

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