Issues · SciML/ModelingToolkit.jl · GitHub

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`Float64(::ForwardDiff.Dual{..})` error when differentiating over SCCNonlinearProblem

#4456

· SebastianM-C opened

on Apr 16, 2026

MTK: vectors with mixed initial values and guesses

#4448

· B-LIE opened

on Apr 13, 2026

Why "Cyclic Guesses" error message when creating ODEProblem?

#4446

· B-LIE opened

on Apr 10, 2026

Unexpected "Symbol is not present in the system"

#4441

· baggepinnen opened

on Apr 10, 2026

Does a very large number of observed variables (3207 vs 1188 equations) significantly increase ODEProblem memory?

#4435

· aizuo-chen opened

on Apr 9, 2026

`reinit!` dominates runtime and allocations in integrator update loop

#4409

· jClugstor opened

on Mar 24, 2026

collect_scoped_vars! silently skips array-typed equations (symtype <: Number check)

#4392

· xtalax opened

on Mar 13, 2026

`sol[sym]` throws for observed expressions combining `@discretes` and continuous states

#4381

· martincornejo opened

on Mar 9, 2026

Fails to solve numeric problem, which is successfully generated

#4377

· B-LIE opened

on Mar 5, 2026

TTFX: Upstream invalidation fixes to reduce compilation time by ~40k invalidations

#4358

· ChrisRackauckas-Claude opened

on Feb 26, 2026

Adding SciMLLogging Integration

#4357

· jClugstor opened

on Feb 26, 2026

Repeated optimization (differentiation?) of a System keeps incurring type inference / compilation time

#4351

· cstjean opened

on Feb 24, 2026