SciML/OrdinaryDiffEq.jl

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High performance ordinary differential equation (ODE) and differential-algebraic equation (DAE) solvers, including neural ordinary differential equations (neural ODEs) and scientific machine learning (SciML)

Stars: 683
Forks: 276
Open beginner issues: 0
Indexed issues: 386
Avg merge: 1d 5h
Merged PRs (30d): 198

Dominant language: Julia
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted hacktoberfest

Beginner friendly Everything

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386 open issues indexed

DelayDiffEq: callback save_positions decides the correctness of the history, not just the saved output Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

SciML/OrdinaryDiffEq.jl#4515 · Opened Sep 11, 2026
PDIRK QA fails on Julia 1.10: stale threading imports and documented SciMLBase reexports rejected Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

SciML/OrdinaryDiffEq.jl#4463 · Opened Sep 5, 2026
Wrapping PETSc TS behind the common interface Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

SciML/OrdinaryDiffEq.jl#4451 · 10 comments · Opened Aug 31, 2026
StochasticDiffEq: JumpProblem callback stored in kwargs fires twice Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4439 · Opened Aug 30, 2026
Intermittent "cannot resize array with shared data" in ode_cache_tests on Julia 1.10: LinearSolve's QR/SVD fallback reshapes cache.tmp Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

SciML/OrdinaryDiffEq.jl#4425 · Opened Aug 29, 2026
`MethodOfSteps(SDIRK2())` on Robertson DDE allocates indefinitely after first-step qmax change Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4389 · 4 comments · Opened Aug 26, 2026
Inaccurate ForwardDiff event-time derivative through a terminating ContinuousCallback Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

SciML/OrdinaryDiffEq.jl#4388 · 2 comments · Opened Aug 26, 2026
new_W_dt_cutoff not respected for linear problems Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

SciML/OrdinaryDiffEq.jl#4370 · Opened Aug 24, 2026
AutoSwitch composite with a FIRK stiff member errors: "type CompositeCache has no field iter" in stepsize_controller! Open

Difficulty 3/5 1-2 days Newbie friendliness 76/100

SciML/OrdinaryDiffEq.jl#4364 · 1 comment · Opened Aug 23, 2026
Solver statistics race when a solver threads its stage solves Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/OrdinaryDiffEq.jl#4349 · Opened Aug 23, 2026
Generalize `extrapolant/predictor` interface for next state prediction Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4331 · 2 comments · Opened Aug 21, 2026
OrdinaryDiffEqBDF Core: DAE out-of-place custom-jac test errors with lu_instance(::Nothing) on master Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

SciML/OrdinaryDiffEq.jl#4304 · Opened Aug 18, 2026
Mooncake gradient through SensitivityADPassThrough fails with a typeassert in get_concrete_problem Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#4294 · Opened Aug 17, 2026
Hairer4/Hairer42 with KrylovJL_GMRES fail on an index-1 DAE (Regression_I) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#4293 · 1 comment · Opened Aug 17, 2026
ROS3P, ROS3PR and ROS34PW1a: adaptivity does not respond to tolerance Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4291 · 7 comments · Opened Aug 17, 2026
ρ∞-Bathe method for structural dynamics Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4286 · Opened Aug 16, 2026
docs: catalog remaining public and developer interfaces Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

SciML/OrdinaryDiffEq.jl#4285 · Opened Aug 16, 2026
NonlinearSolveAlg silently fails with quasi-Newton inner solvers (Broyden, Klement) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4283 · 3 comments · Opened Aug 16, 2026
NonlinearSolve downgrade job: OrdinaryDiffEqCore floor 4.12 predates the get_differential_vars inference fix; 4.13 then hits the MatrixOperator diagnostics MethodError (#4244) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4278 · Opened Aug 15, 2026
Master sublibrary routes cannot resolve unregistered SciMLBase 3.46.2 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/OrdinaryDiffEq.jl#4249 · 2 comments · Opened Aug 14, 2026
QA: Extrapolation has a stale Sequential explicit import on master Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

SciML/OrdinaryDiffEq.jl#4237 · Opened Aug 13, 2026
QA: NonlinearSolve JET type-stability checks fail on master Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/OrdinaryDiffEq.jl#4238 · Opened Aug 13, 2026
Newton-Krylov instability diagnostics call matrix-only helper on JVPCache Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4218 · 2 comments · Opened Aug 11, 2026
SDIRK2 CSC/diag CuArray loses CPU/GPU agreement after guarded-Hegedüs boundary Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#4215 · Opened Aug 11, 2026
Adaptive tolerance for iterative inner linear solvers Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4207 · 2 comments · Opened Aug 11, 2026
`log_numerical_instability` crashes for ODEs with `ComponentVector` states Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

SciML/OrdinaryDiffEq.jl#4203 · 1 comment · Opened Aug 10, 2026
NonlinearSolveAlg DAE stage residual: daenlf/oopdaenlf do not match the _compute_rhs DAEFunction methods Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/OrdinaryDiffEq.jl#4198 · Opened Aug 9, 2026
NonlinearSolveAlg(LevenbergMarquardt) returns ReturnCode.Success with wrong answers (successor to #4125) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4197 · 1 comment · Opened Aug 9, 2026
ProbNumDiffEq downstream job uses Julia 1.10 for a Julia 1.12 test environment Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#4186 · 1 comment · Opened Aug 9, 2026
Downgrade sublibrary jobs resolve incompatible SciMLBase 3.43 / SciMLPublic 1.0.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

SciML/OrdinaryDiffEq.jl#4185 · 1 comment · Opened Aug 9, 2026
Rosenbrock23 drops SLArray labels in out-of-place stage broadcast Open

Difficulty 4/5 3-5 days Newbie friendliness 64/100

SciML/OrdinaryDiffEq.jl#4178 · Opened Aug 8, 2026
ESDIRK methods handle mass matrices incorrectly Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4173 · 4 comments · Opened Aug 8, 2026
Instability logging throws on in-place problems with an analytic Jacobian: get_fresh_jacobian calls out-of-place calc_J Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

SciML/OrdinaryDiffEq.jl#4155 · Opened Aug 8, 2026
Julia 1.10 QA JET fails for strict Rodas initialization on logging dispatch Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

SciML/OrdinaryDiffEq.jl#4143 · 1 comment · Opened Aug 5, 2026
Register OrdinaryDiffEqDifferentiation 3.3 floor (tier 1/3) Open

Difficulty 2/5 1-3 hours Newbie friendliness 57/100

SciML/OrdinaryDiffEq.jl#4086 · 44 comments · Opened Jul 31, 2026
Proposal: ValidatedDiffEq.jl — a validated/rigorous IVP solver (End-Cover / Taylor-Tube) Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

SciML/OrdinaryDiffEq.jl#3990 · Opened Jul 23, 2026
Minimum-compatible Rosenbrock graph exposes four AutoEnzyme convergence failures Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#3987 · Opened Jul 22, 2026
OrdinaryDiffEqNonlinearSolve QA fails on master with SciMLTesting 2.4 Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#3982 · 1 comment · Opened Jul 22, 2026
Add support for pre-step callbacks Open

Difficulty 5/5 Over a week Newbie friendliness 48/100

SciML/OrdinaryDiffEq.jl#3977 · 16 comments · Opened Jul 21, 2026
Rodas5P step size collapses (dt ≈ 2e-7, ~1M accepted steps) on a stiff mass-matrix ODE after OrdinaryDiffEqRosenbrock 2.4.2 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#3974 · 1 comment · Opened Jul 21, 2026
Downgrade Sublibraries: TaylorSeries unsatisfiable after DataStructures 0.19.6 (OrderedCollections 2.0.1 vs Symbolics 7.6.0 Latexify weakdep) Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

SciML/OrdinaryDiffEq.jl#3958 · 3 comments · Opened Jul 18, 2026
BDF coverage-mode inference regression is not isolated to the five NonlinearSolve/LinearSolve upgrades Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#3926 · Opened Jul 16, 2026
GPU DAE tests: 100% failure since GPU CI lane restored (#3813), likely Diagonal mass matrix scalar indexing Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

SciML/OrdinaryDiffEq.jl#3922 · 1 comment · Opened Jul 16, 2026
Split the verified stochastic QA repairs from closed PR #3861 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#3911 · Opened Jul 15, 2026
Document the StochasticDiffEqCore public API exposed by QA Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

SciML/OrdinaryDiffEq.jl#3910 · Opened Jul 15, 2026
Follow-up improvements for GaussLegendre Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

SciML/OrdinaryDiffEq.jl#3809 · 1 comment · Opened Jul 1, 2026
ExplicitImports: drive sublibrary QA checks to green (ei_broken markers) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#3776 · 2 comments · Opened Jun 25, 2026
RKMK Wrapper for Runge-Kutta Methods Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

SciML/OrdinaryDiffEq.jl#3764 · Opened Jun 17, 2026
OrdinaryDiffEqDefault_GPU: Autoswitch GPU @test_nowarn fails on GPUCompiler link_library!/link_libraries! deprecation warnings Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

SciML/OrdinaryDiffEq.jl#3649 · Opened May 18, 2026
DelayDiffEq Integrators+Interface tests fail on master after #3641 (SDIRK perform_step regression) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

SciML/OrdinaryDiffEq.jl#3648 · Opened May 18, 2026

SciML/OrdinaryDiffEq.jl

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