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wyjjf

гæ (ÕýʽдÊÖ)

[½»Á÷] matlab±à³ÌÌáʾ¡°???Undefined function or variable 'ODE45_main'. ÒÑÓÐ1È˲ÎÓë

ÊéÖа¸Àý
µÚÒ»¸öODE45_fun.m
function dy=ODE45_fun(t,y)
a=1;b=1;c=9;

dy(1)=-a*y(1)+y(3)*y(2);
dy(2)=-b*(y(1)+y(3));
dy(3)=c*y(2)-y(3)-3*y(2)*y(1);

dx=[dx(1);dx(2);dx(3)];

µÚ2¸öODE45_main.m
tspan=[0,100];
y0=[0;0;10^(-10)];
[t,y]=ode45('ODE45_fun',tspan,y0);
data=[t,y];
save ODE45_data.txt data-ascii
plot3(y(:,1),y(:,2),y(:,2))
grid on
title('Lorenz ·½³Ì')

>> ODE45_main

½á¹û£º  ??? Undefined function or variable 'ODE45_main'.
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xiegangmai

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Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
ÄãµÄÁ½¸öÎļþ²»ÔÚMatlabµÄ¹¤×÷Ŀ¼Ï°ɡ£

³ÌÐòÖÐÓÐÁ½¸ö´íÎó£º
1. ODE45_fun.mÖУ¬dx=[dx(1);dx(2);dx(3)]; Òª¸ÄΪ£ºdy=[dy(1);dy(2);dy(3)];

2. ODE45_main.mÖУ¬save ODE45_data.txt data-asciiÒª¸ÄΪ£ºsave ODE45_data.txt data -ascii
»ò
save('ODE45_data.txt','data','-ascii')
Ã÷µÂºñѧ¡¢ÇóÊÇ´´ÐÂ
2Â¥2015-03-13 16:24:59
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wyjjf

гæ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by xiegangmai at 2015-03-13 16:24:59
ÄãµÄÁ½¸öÎļþ²»ÔÚMatlabµÄ¹¤×÷Ŀ¼Ï°ɡ£

³ÌÐòÖÐÓÐÁ½¸ö´íÎó£º
1. ODE45_fun.mÖУ¬dx=; Òª¸ÄΪ£ºdy=;

2. ODE45_main.mÖУ¬save ODE45_data.txt data-asciiÒª¸ÄΪ£ºsave ODE45_data.txt data -ascii
»ò
save ...

лл
3Â¥2015-03-14 17:14:14
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