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Numerical integration "backwards" for ODE45

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Amirah Algethami
Amirah Algethami 2022-12-19
评论： Amirah Algethami 2022-12-19
Hi There;
I should apply Backword integration for system of differential equation by ODE45 solver in Matlab, it seems easy for some people, I want an example to understand how to make Backword integration. your answer appreciated.
Best
AA

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采纳的回答

Torsten
Torsten 2022-12-19
Ran in:
fun = @(t,y) y;
tspan = [0 1];
y0 = 1;
[Tf,Yf] = ode45(fun,tspan,y0);
tspan = [1 0];
y0 = exp(1);
[Tb,Yb] = ode45(fun,tspan,y0);
plot(Tf,Yf,Tb,Yb)

更多回答（1 个）

Fabio Freschi
Fabio Freschi 2022-12-19
you may be interested to read the comments to this post
https://www.mathworks.com/matlabcentral/answers/4592-numerical-integration-backwards
  3 个评论
显示 1更早的评论
Fabio Freschi
Fabio Freschi 2022-12-19
@Torsten already reported an example. I still warn you to pay attention to integrate backwards because in some cases you may have numerica blowup
Amirah Algethami
Amirah Algethami 2022-12-19
thanks , I hoping that not will happen with my equations.

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