Why ode45 is not working??

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Frane
Frane on 19 Jul 2021
Edited: Frane on 22 Jul 2021
Hello,
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?
Thanks.
  35 Comments
Frane
Frane on 22 Jul 2021
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.

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Answers (1)

Tesfaye Girma
Tesfaye Girma on 21 Jul 2021
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);
subplot(311)
plot(t,y(:,1))
subplot(312)
plot(t,y(:,2))
subplot(313)
plot(t,y(:,3))
  3 Comments
Frane
Frane on 22 Jul 2021
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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