在Matlab下输入：edit zhidao_rk4_3.m，然后将下面两行百分号之间的内容，复制进去，保存橘物卖
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function y=zhidao_rk4_3(t,x)
a=0.01;
b=0.02;
y=[x(1)-a*x(1)*x(2);-x(2)+b*x(1)*x(2)];
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在Matlab下圆逗面输入：
t_end=15;
x0=[20;20];
[t,x]=ode45('zhidao_rk4_3',[0,t_end],x0);
plot(t,x);
legend('野兔','狐狸'蚂橘)
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