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Doctorcbw

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woshilsh

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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
È»ºóhold on
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2Â¥2009-10-11 14:58:48
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Doctorcbw

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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£©£»
×÷ͼ³ÌÐòÈçÏ£º
%ode45_example.m
[t,x]=ode45(@ivpodefun,[0 1000],[0.0001;0.0001]);
axis([-50 50 -50 50]);
plot(x(:,1),x(:,2),'-')
ÎÒÏë¸Ä±ä³õʼµãµÄÖµ×÷ͼ£¬¼´
[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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Çó½Ì£¡°Ýл£¡£¡£¡
3Â¥2009-10-11 15:09:13
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woshilsh

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¡ï ¡ï ¡ï
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
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Doctorcbw

ľ³æ (Ö°Òµ×÷¼Ò)

²»ÐÐ Ö»»­³öÁ˵ÚÒ»¸öͼ£¡µÚ¶þͼÏÔʾ²»³öÀ´
5Â¥2009-10-11 15:35:45
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Doctorcbw

ľ³æ (Ö°Òµ×÷¼Ò)

t_final=100;
x0=[1.1;  -3.1;   1];
x3=[-10;-10.9;-12];


[t1,x1]=ode45('bss',[0,t_final],x0);

[t2,x2]=ode45('bss',[0,t_final],x3);


axis([-30 30 -50 75 -70 50 ])
plot3(x1(:,1),x1(:,2),x1(:,3),'-');hold on
plot3(x2(:,1),x2(:,2),x2(:,3),'*'); hold on
6Â¥2009-10-11 15:36:24
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Doctorcbw

ľ³æ (Ö°Òµ×÷¼Ò)

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7Â¥2009-10-11 15:36:46
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

woshilsh

ÈÙÓþ°æÖ÷ (Ö°Òµ×÷¼Ò)

ÓÅÐã°æÖ÷

ÒýÓûØÌû:
Originally posted by Doctorcbw at 2009-10-11 15:36:
Ö»ÄÜ»­³öµÚÒ»¸öͼ

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8Â¥2009-10-11 15:38:01
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Doctorcbw

ľ³æ (Ö°Òµ×÷¼Ò)

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9Â¥2009-10-11 15:38:30
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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