I’m trying to save the derivative values from an ODE using SavingCallback from DiffEqCallbacks.jl. Why is manual_du not the same as save_du.saveval in this code? Am I misunderstanding when these values are saved, or is this is an issue? using OrdinaryDiffEq, DiffEqCallbacks function f!(du, u, p, t)…

Wrong derivatives saved with SavingCallback

ChrisRackauckas January 4, 2023, 2:40am 2

It’s pulled from the interpolation so it’s only to tolerance. Lower the tolerance on the solve and it should converge.

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