Why ode45 is not working??

8 ビュー (過去 30 日間)
Frane 2021 年 7 月 19 日
編集済み: Frane 2021 年 7 月 22 日
I've uploaded the two following files:
1. epas_steering_system.m is the main file, and it is the file where ode45 gives me an error,
2. epasFun.m is the function file.
My question is, does somebody know why ode45 won't work?
  35 件のコメント
Torsten 2021 年 7 月 21 日
According to the equations you posted, they seem to be implemented correctly in epasFun.
Of course, I can't tell whether they are correct or whether the parameters you chose make sense.
Frane 2021 年 7 月 22 日
I checked the parameters, they are okey; checked the equations, they are okey.
It could be something with the code itself (probably with the ode45 part). To be honest I don't know what, and I'm stuck at the moment.


回答 (1 件)

Tesfaye Girma
Tesfaye Girma 2021 年 7 月 21 日
you can try this approach if it worked for you
f = (t,y) [ 4.86*y(3) - 4.86*10^14*y(1)*y(2);
4.86*y(3) - 4.86*10^14*y(1)*y(2);
-4.86*y(3) + 4.86*10^14*y(1)*y(2) ];
opt = odeset('maxstep',1e-13);
tspan = [0 1e-11];
y0 = [1.48e-8; 6.7608e-3; 1];
[t,y] = ode45(f,tspan,y0,opt);
  3 件のコメント
Tesfaye Girma
Tesfaye Girma 2021 年 7 月 22 日
you are right thank you brother!!
Frane 2021 年 7 月 22 日
編集済み: Frane 2021 年 7 月 22 日
Where did you get this numbers that are multiplying y(1), y(2) and y(3) in f=(t,y), and the numbers from y0?
Did you try my code and added these numbers and it worked or?
And what should y(1), y(2) and y(3) represent?



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