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Cannot set defaults that contain differentiated variables #3344

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hersle opened this issue Jan 18, 2025 · 0 comments

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bug

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hersle commented Jan 18, 2025

using ModelingToolkit, OrdinaryDiffEq
using ModelingToolkit: t_nounits as t, D_nounits as D
@variables y(t)
@named sys = ODESystem([D(y) ~ 1], t; defaults = [y => D(y)])
sys = structural_simplify(sys)
dprob = ODEProblem(sys, [], (0.0, 1.0), [])

fails with

ERROR: Differential found in a non-differential system. Likely this is a bug in the construction of an initialization system. Please report this issue with a reproducible example. Offending equation: 0 ~ -y(t) + Differential(t)(y(t))

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hersle added the bug label

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