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ChrisRackauckas avatar ChrisRackauckas commented on June 15, 2024

DifferentialEquations already does hybrid systems through its event handling interface (and the jump problems help here as well). In fact, the bouncing ball is the documentation example: http://docs.juliadiffeq.org/latest/features/callback_functions.html#ContinuousCallback-Examples-1

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Datseris avatar Datseris commented on June 15, 2024

Yeap that was exactly what I was looking at when I wrote this issue. The bouncy ball.

One would most likely make a new type, subtype of ContinuousDynamicalSystem that would work exactly like ContiniousDS with simply an extra field called "callback" or something.

The this would allow pretty clear and straight forward communication with DiffEq, since to establish this the only thing necessary is to have a ODEProblem(ds::DynamicalSystem) method.

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ChrisRackauckas avatar ChrisRackauckas commented on June 15, 2024

Or you just add a callback keyword to your ContiniousDS ?

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Datseris avatar Datseris commented on June 15, 2024

So that the field callback would always exist but by default would be initialized in e.g. nothing ? Does the ODE handle nothing? How is the representation of missing callbacks?

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ChrisRackauckas avatar ChrisRackauckas commented on June 15, 2024

It handles nothing by using no callbacks. That's the default.

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Datseris avatar Datseris commented on June 15, 2024

Yeap. Awesome, this seems like the best idea! To add an extra field to ContinuousDS!

But wait a moment. This does not allow the motion to turn fully discrete until another second callback, right?

I mean, a problem becoming fully discrete, then after some condition becomes continuous again?

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Datseris avatar Datseris commented on June 15, 2024

This issue was moved to JuliaDynamics/DynamicalSystemsBase.jl#5

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