matlab程序应用练习题2016(2)

?1??bx?x1?x2,x3??2??axx ?x （1） 2?a,3?x2?,x3??3??x1x2?cx a=学号后两位；c=28；b=8/3; x初始值取0，时间自定，可取100s。 syms x1 x2 x3; S=dsolve('Dx=-2*x2+2*x3','Dy=28*x2-x3-x1*x2','Dz=-8/3*x1+x2*x3','x(0)=0','y(0)=0','z(0)=1','x3'); x=S.x y=S.y z=S.z hold on; ezplot(x); ezplot(y); ezplot(z); 第 6 页，共 6 页