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how can I condition my ode solver

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Noya Linder
Noya Linder 2023-6-15
编辑： Torsten 2023-6-16
I use an ode solver here
[t, R] = ode78(@odefun, tspan, r0);
but I don't want it to run until the final t, I want it to run until R is at a certain value, and I have no idea how to go about doing that.

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回答（1 个）

Torsten
Torsten 2023-6-15
移动：Torsten 2023-6-15
Use the Event Facility of the ODE integrators:
https://uk.mathworks.com/help/matlab/math/ode-event-location.html
  2 个评论
Noya Linder
Noya Linder 2023-6-16
And what happens if the "position" is not exactly zero? How can I specify tolerance to the value which will result in a termination?
Torsten
Torsten 2023-6-16
编辑：Torsten 2023-6-16
ode78 checks where the expression (R - certain value) changes sign. This is the position where R reaches the specified value. There is no need to specify a tolerance.

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