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5Â¥2009-10-11 15:35:45
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ÓàÔó³É(½ð±Ò+1,VIP+0):ÐÁ¿àÁË£¡ 10-11 15:01
Doctorcbw(½ð±Ò+10,VIP+0): 10-11 15:39
ÏÈ´òÓ¡³öÒ»¸ö
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2Â¥2009-10-11 14:58:48
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ÒÔÏÂÊÇÊäÈëÒ»¸ö΢·Ö·½³Ì:
%ivpodefun.m
function dxdt=ivpodefun(t,x)
dxdt   =zeros(2,1);
dxdt(1)=x(2);
dxdt(2)=-x(1)+x(1)^3-2*x(2£©£»
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%ode45_example.m
[t,x]=ode45(@ivpodefun,[0 1000],[0.0001;0.0001]);
axis([-50 50 -50 50]);
plot(x(:,1),x(:,2),'-')
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[t,x]=ode45(@ivpodefun,[0 1000],[-0.0001;-0.0001]);
axis([-50 50 -50 50]);
plot(x(:,1),x(:,2),'-')

[t,x]=ode45(@ivpodefun,[0 1000],[-0.0001;0.0001]);
axis([-50 50 -50 50]);
plot(x(:,1),x(:,2),'-')

[t,x]=ode45(@ivpodefun,[0 1000],[0.0001;-0.0001]);
axis([-50 50 -50 50]);
plot(x(:,1),x(:,2),'-')
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3Â¥2009-10-11 15:09:13
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woshilsh

ÈÙÓþ°æÖ÷ (Ö°Òµ×÷¼Ò)

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Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
ÓàÔó³É(½ð±Ò+2,VIP+0):Ö§³ÖÓ¦Öú£¡ 10-11 16:38
[t1,x1]=ode45(@ivpodefun,[0 1000],[0.0001;0.0001]);

[t2,x2]=ode45(@ivpodefun,[0 1000],[-0.0001;-0.0001]);

[t3,x3]=ode45(@ivpodefun,[0 1000],[-0.0001;0.0001]);

[t,x]=ode45(@ivpodefun,[0 1000],[0.0001;-0.0001]);

axis([-50 50 -50 50]);
plot(x1(:,1),x1(:,2),'-') £»hold on
plot(x2(:,1),x2(:,2),'*'); hold on.....ÏÂÃæµÄÒ»Ñù

[ Last edited by woshilsh on 2009-10-11 at 15:26 ]
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4Â¥2009-10-11 15:23:02
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