微分方程实验.rar_ODE45_shinning31q_微分方程_微分方程MATLAB_微分方程组

[t1,x]=ode45('shier1',[0 15],[25 2]); [t2,y]=ode45('shier2',[0 15],[25 2]); x1=x(:,1);x2=x(:,2); x3=x2./(x1+x2); y1=y(:,1);y2=y(:,2); y3=y2./(y1+y2); plot(t1,x3,'-',t2,y3,'*')