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★ ★ ★ ★ nono2009(金幣+2):鼓勵應(yīng)助。 2010-06-22 07:46:55 qhlu788(金幣+8): 2010-06-22 09:03:16 zzuwangshilei(金幣+2):幫助他人解決問題 2010-06-22 19:47:15
function ydot=DyDt(t,y)
ydot=[y(2);(y(4)^2*sin(y(3)-y(1))-y(2)^2*sin(y(3)-y(1))*cos(y(3)-y(1))...
-2*sin(y(1))+cos(t)*2*cos(y(1))+cos(y(3)-y(1))*sin(y(3))-cos(t)*...
cos(y(3))*cos(y(3)-y(1)))/(2-cos(y(3)-y(1))^2);y(4);(1/2*y(4)^2*...
sin(y(3)-y(1))*cos(y(3)-y(1))-sin(y(1))*cos(y(3)-y(1))+cos(t)*cos(y(1))...
*cos(y(3)-y(1))-y(2)^2*sin(y(3)-y(1))+sin(y(3))-cos(t)*cos(y(3)))...
/(1/2*cos(y(3)-y(1))^2-1)];
clear all
tspan=[0,100];
y0=[1;0;1;0];
[tt,yy]=ode45(@DyDt,tspan,y0);
subplot(2,1,1)
plot(tt,yy(:,1),tt,yy(:,3),'r:')
legend('\theta_{1}','\theta_{2}')
grid on
ttt=tt(1:10);
yyy=yy(1:10,1);
yyyy=yy(1:10,3);
subplot(2,1,2)
plot(ttt,yyy,ttt,yyyy,'r:')
grid on
legend('\theta_{1}','\theta_{2}')
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