# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=14

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 15

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## [Reset model parameters Flux.jl](https://discourse.julialang.org/t/reset-model-parameters-flux-jl/35021)

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**Author:** [@luboshanus](https://discourse.julialang.org/u/luboshanus)\
**Replies:** 3\
**Last updated:** [January 15, 2026, 4:05pm UTC](https://discourse.julialang.org/t/reset-model-parameters-flux-jl/35021 "2026-01-15T16:05:48Z")

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Hi, I’d like to ask how to reset model parameters without saving initial parameters of the model such as init\_theta = Flux.params(model) and then loading them to the model when reseting. I would like to use built in Flu…

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## [Probit marginal effects](https://discourse.julialang.org/t/probit-marginal-effects/124773)

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**Author:** [@hendri54](https://discourse.julialang.org/u/hendri54)\
**Replies:** 1\
**Last updated:** [January 15, 2026, 3:33pm UTC](https://discourse.julialang.org/t/probit-marginal-effects/124773 "2026-01-15T15:33:26Z")

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I am looking for a package that can estimate probit regressions and calculate marginal effects. GLM.jl can estimate the regression, but (to my knowledge) not calculate the marginal effects. Effects.jl appears to only app…

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## [Ternary plots in GMT.jl](https://discourse.julialang.org/t/ternary-plots-in-gmt-jl/63181)

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**Author:** [@joa-quim](https://discourse.julialang.org/u/joa-quim)\
**Replies:** 14\
**Last updated:** [January 14, 2026, 6:11pm UTC](https://discourse.julialang.org/t/ternary-plots-in-gmt-jl/63181 "2026-01-14T18:11:49Z")

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The ternary plots topic has been raised here several times. I’ve added ternary plots to GMT.jl. Unfortunately it’s still not yet possible to slant the ticks, which helps a lot in reading the graphs, as that it will have …

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## [ModelingToolkit complex system of equations](https://discourse.julialang.org/t/modelingtoolkit-complex-system-of-equations/113370)

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**Author:** [@ograsdijk](https://discourse.julialang.org/u/ograsdijk)\
**Replies:** 4\
**Last updated:** [January 14, 2026, 2:47pm UTC](https://discourse.julialang.org/t/modelingtoolkit-complex-system-of-equations/113370 "2026-01-14T14:47:30Z")

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A few years ago I had a similar problem regarding a system of complex equations and I had found a workaround: ModelingToolkit matrix form system of equations and complex values. As far as I can tell complex symbolics ar…

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## [Can anyone tell me why this figure is appearing in the corner?](https://discourse.julialang.org/t/can-anyone-tell-me-why-this-figure-is-appearing-in-the-corner/135014)

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**Author:** [@Mervyn\_Larrier](https://discourse.julialang.org/u/Mervyn_Larrier)\
**Replies:** 3\
**Last updated:** [January 14, 2026, 5:05am UTC](https://discourse.julialang.org/t/can-anyone-tell-me-why-this-figure-is-appearing-in-the-corner/135014 "2026-01-14T05:05:08Z")

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I’m new to GLMakie; I typically use CairoMakie. While the code runs and the plot does appear, it appears at the bottom left corner of the window, invariably. Can anyone tell me why? It feels like it might be something ob…

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## [New ROOT.jl release, v0.4.0](https://discourse.julialang.org/t/new-root-jl-release-v0-4-0/135036)

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**Author:** [@grasph](https://discourse.julialang.org/u/grasph)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 8:48pm UTC](https://discourse.julialang.org/t/new-root-jl-release-v0-4-0/135036 "2026-01-13T20:48:26Z")

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Dear all, Version 0.4.0 of ROOT.jl, presented at the ROOT users’ workshop was released Today in the General registry. This version, originally planned for November and delayed due to an issue when using Julia 1.12 prev…

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## [How to plot the parallelized example in "Parallelized Morris and Sobol Sensitivity Analysis of an ODE"](https://discourse.julialang.org/t/how-to-plot-the-parallelized-example-in-parallelized-morris-and-sobol-sensitivity-analysis-of-an-ode/135034)

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**Author:** [@kraqbi](https://discourse.julialang.org/u/kraqbi)\
**Replies:** 1\
**Last updated:** [January 13, 2026, 5:54pm UTC](https://discourse.julialang.org/t/how-to-plot-the-parallelized-example-in-parallelized-morris-and-sobol-sensitivity-analysis-of-an-ode/135034 "2026-01-13T17:54:12Z")

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Hello! I am trying GolbalSensitivity.jl for the first time, so please forgive me if this is a rookie mistake. I have trouble with the example in the doc : I reproduce the example until there : sobol\_result = gsa(f1,…

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## [Difference between tstops and d\_discontinuities](https://discourse.julialang.org/t/difference-between-tstops-and-d-discontinuities/126847)

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**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 3\
**Last updated:** [January 13, 2026, 2:30pm UTC](https://discourse.julialang.org/t/difference-between-tstops-and-d-discontinuities/126847 "2026-01-13T14:30:38Z")

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The docstring says: • tstops: Denotes extra times that the timestepping algorithm must step to. This should be used to help the solver deal with discontinuities and singularities, since stepping exactly at t…

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## [\[ANN\] Epicycle.jl Initial Release (Space Mission Design and Trajectory Optimization)](https://discourse.julialang.org/t/ann-epicycle-jl-initial-release-space-mission-design-and-trajectory-optimization/135025)

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**Author:** [@stevenhughes](https://discourse.julialang.org/u/stevenhughes)\
**Replies:** 1\
**Last updated:** [January 13, 2026, 2:03pm UTC](https://discourse.julialang.org/t/ann-epicycle-jl-initial-release-space-mission-design-and-trajectory-optimization/135025 "2026-01-13T14:03:32Z")

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Hi All, Here is a link to an Astro/Space Release announcement that I posted to Package Announcements. Posting link here in case you don’t watch that thread. \[ANN\] Epicycle.jl Initial Release - Space Mission Design and…

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## [To what extent can JuMP's macro identify input expression and generate optimized backend codes?](https://discourse.julialang.org/t/to-what-extent-can-jumps-macro-identify-input-expression-and-generate-optimized-backend-codes/134983)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 12\
**Last updated:** [January 13, 2026, 6:24am UTC](https://discourse.julialang.org/t/to-what-extent-can-jumps-macro-identify-input-expression-and-generate-optimized-backend-codes/134983 "2026-01-13T06:24:05Z")

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JuMP’s macros are like magic black boxes to me. I’ve learned that one should generally make use of @variable, @constraints and @objective when constructing a model from scratch. But I have some small but nontrivial quest…

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## [Accessing LScene and Figure attributes from Makie Recipes](https://discourse.julialang.org/t/accessing-lscene-and-figure-attributes-from-makie-recipes/126320)

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**Author:** [@tonygem96](https://discourse.julialang.org/u/tonygem96)\
**Replies:** 1\
**Last updated:** [January 12, 2026, 7:14pm UTC](https://discourse.julialang.org/t/accessing-lscene-and-figure-attributes-from-makie-recipes/126320 "2026-01-12T19:14:41Z")

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Is it possible to access figure level or LScene level attributes from a Makie recipe? For example, in the MWE below, myplot(::MyTypeA) defaults to an LScene. Can I control show\_axis=false from within the recipe? I under…

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## [ModelingToolkit compiler does not simplify as expected](https://discourse.julialang.org/t/modelingtoolkit-compiler-does-not-simplify-as-expected/134978)

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**Author:** [@PhysicsBender](https://discourse.julialang.org/u/PhysicsBender)\
**Replies:** 9\
**Last updated:** [January 12, 2026, 7:01am UTC](https://discourse.julialang.org/t/modelingtoolkit-compiler-does-not-simplify-as-expected/134978 "2026-01-12T07:01:56Z")

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I have noticed that the ModelingToolkit compiler does not simplify systems as expected, creating more unknowns and differential equations. At first I thought it was because it was finding linear systems that it was unabl…

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## [Specifying objective coefficient when creating a JuMP variable](https://discourse.julialang.org/t/specifying-objective-coefficient-when-creating-a-jump-variable/134923)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 5\
**Last updated:** [January 12, 2026, 3:36am UTC](https://discourse.julialang.org/t/specifying-objective-coefficient-when-creating-a-jump-variable/134923 "2026-01-12T03:36:47Z")

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What about adding a kwarg option obj in JuMP.@variable so that we can specify objective coefficients? just like the existing lower\_bound? julia\> import JuMP julia\> model = JuMP.Model(); julia\> JuMP.set\_objective\_sense…

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## [How can I implement a vector of StaticArrays as a variable in MTK?](https://discourse.julialang.org/t/how-can-i-implement-a-vector-of-staticarrays-as-a-variable-in-mtk/134962)

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**Author:** [@pmc4](https://discourse.julialang.org/u/pmc4)\
**Replies:** 6\
**Last updated:** [January 11, 2026, 5:13pm UTC](https://discourse.julialang.org/t/how-can-i-implement-a-vector-of-staticarrays-as-a-variable-in-mtk/134962 "2026-01-11T17:13:01Z")

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Hi everyone. After trying for weeks I would like to ask the community if what I’m trying to do is possible or whether I have arrived to a dead end. I’ve reduced it to a MWE. The system I want to solve in ModelingToolkit…

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## [Pre-computing Groupings for DataFrames?](https://discourse.julialang.org/t/pre-computing-groupings-for-dataframes/134973)

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**Author:** [@nateybear](https://discourse.julialang.org/u/nateybear)\
**Replies:** 6\
**Last updated:** [January 10, 2026, 9:12pm UTC](https://discourse.julialang.org/t/pre-computing-groupings-for-dataframes/134973 "2026-01-10T21:12:05Z")

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Hi! I’m writing to check my understanding of a computational problem and see if I am approaching things correctly. I am writing estimation code that needs to traverse data in multiple different ways. The typical approac…

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## [Symposium “PIML Day: Methodological and theoretical advances in Physics-Informed Machine Learning" - Paris 15 April 2026](https://discourse.julialang.org/t/symposium-piml-day-methodological-and-theoretical-advances-in-physics-informed-machine-learning-paris-15-april-2026/134974)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 2\
**Last updated:** [January 10, 2026, 7:43pm UTC](https://discourse.julialang.org/t/symposium-piml-day-methodological-and-theoretical-advances-in-physics-informed-machine-learning-paris-15-april-2026/134974 "2026-01-10T19:43:53Z")

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Hello, I forward the announcement below: We are pleased to announce the symposium “PIML Day: Methodological and theoretical advances in Physics-Informed Machine Learning” on Wednesday, April 15, 2026. The event will ta…

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## [Feedback wanted: GPU-accelerated 2D elastic wave simulation (staggered-grid FD) in Julia](https://discourse.julialang.org/t/feedback-wanted-gpu-accelerated-2d-elastic-wave-simulation-staggered-grid-fd-in-julia/134869)

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**Author:** [@Wuheng10086](https://discourse.julialang.org/u/Wuheng10086)\
**Replies:** 10\
**Last updated:** [January 10, 2026, 3:16pm UTC](https://discourse.julialang.org/t/feedback-wanted-gpu-accelerated-2d-elastic-wave-simulation-staggered-grid-fd-in-julia/134869 "2026-01-10T15:16:09Z")

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Hi everyone, I’m currently working on a GPU-accelerated 2D elastic wave simulation code in Julia, based on staggered-grid finite-difference discretization. The original motivation is seismic forward modeling, but I’m …

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## [HiGHS OTHER\_ERROR](https://discourse.julialang.org/t/highs-other-error/134521)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 16\
**Last updated:** [January 8, 2026, 9:49pm UTC](https://discourse.julialang.org/t/highs-other-error/134521 "2026-01-08T21:49:17Z")

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What does this mean? Is it infeasible, is it solved? Thx Running HiGHS 1.12.0 (git hash: 755a8e027a): Copyright (c) 2025 HiGHS under MIT licence terms LP has 4246 rows; 3330 cols; 15361 nonzeros Coefficient ranges: Ma…

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## [SymbolicIntegration: can I do definite integrals?](https://discourse.julialang.org/t/symbolicintegration-can-i-do-definite-integrals/134951)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 3\
**Last updated:** [January 8, 2026, 1:29pm UTC](https://discourse.julialang.org/t/symbolicintegration-can-i-do-definite-integrals/134951 "2026-01-08T13:29:13Z")

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Does SymbolicIntegration.jl support definite integrals? Including to +/- infinity? If so, what is the syntax for specifying integration bounds?

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## [BSD on ARM](https://discourse.julialang.org/t/bsd-on-arm/134811)

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**Author:** [@phma](https://discourse.julialang.org/u/phma)\
**Replies:** 3\
**Last updated:** [January 6, 2026, 8:24pm UTC](https://discourse.julialang.org/t/bsd-on-arm/134811 "2026-01-06T20:24:21Z")

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I’ve been developing a system in Julia for someone, and we’re hoping to set up a network of actual devices within the next year. Some of these devices will have ARM processors. We may want to use BSD for licensing reason…

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## [ParallelStencil Question](https://discourse.julialang.org/t/parallelstencil-question/134915)

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**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 2\
**Last updated:** [January 6, 2026, 7:48pm UTC](https://discourse.julialang.org/t/parallelstencil-question/134915 "2026-01-06T19:48:22Z")

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Does ParallelStencil.jl support staggered grid implementations?

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## [How to use MTK as one block in a co-simulation](https://discourse.julialang.org/t/how-to-use-mtk-as-one-block-in-a-co-simulation/134895)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 8\
**Last updated:** [January 6, 2026, 1:33pm UTC](https://discourse.julialang.org/t/how-to-use-mtk-as-one-block-in-a-co-simulation/134895 "2026-01-06T13:33:04Z")

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How could I use this model using ModelingToolkit import ModelingToolkit: t\_nounits as t, D\_nounits as D @variables x(t)=0 u(t)=0 y(t) @parameters k = 1 eqs = \[D(x) ~ -k \* (x + u) y ~ x\] @named sys = System(eqs, …

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## [Hessian of a vector-valued in-place function with ForwardDiff.jl](https://discourse.julialang.org/t/hessian-of-a-vector-valued-in-place-function-with-forwarddiff-jl/134904)

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**Author:** [@Yuricst](https://discourse.julialang.org/u/Yuricst)\
**Replies:** 2\
**Last updated:** [January 6, 2026, 8:13am UTC](https://discourse.julialang.org/t/hessian-of-a-vector-valued-in-place-function-with-forwarddiff-jl/134904 "2026-01-06T08:13:07Z")

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I am looking to compute the Hessian of a vector-valued in-place function that looks like function eom!(dx, x, p, t) dx\[1:3\] = x\[4:6\] dx\[4:6\] = -p\[1\] / norm(x\[1:3\])^3 \* x\[1:3\] end using ForwardDiff.jl but I am s…

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## [NODE Training - Performance w/ Lux vs torchdiffeq](https://discourse.julialang.org/t/node-training-performance-w-lux-vs-torchdiffeq/134860)

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**Author:** [@csvance](https://discourse.julialang.org/u/csvance)\
**Replies:** 6\
**Last updated:** [January 5, 2026, 7:13pm UTC](https://discourse.julialang.org/t/node-training-performance-w-lux-vs-torchdiffeq/134860 "2026-01-05T19:13:34Z")

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So I’ve been training a neural ODE in Python using PyTorch and torchdiffeq. I was going to start with Julia and Lux but I ended up needing to train some upstream stuff (pretrained CNN backbones and custom PyTorch layers)…

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## [Arbitrary/High-precision optimisation of NLP](https://discourse.julialang.org/t/arbitrary-high-precision-optimisation-of-nlp/133973)

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**Author:** [@arnerob](https://discourse.julialang.org/u/arnerob)\
**Replies:** 13\
**Last updated:** [January 5, 2026, 4:59pm UTC](https://discourse.julialang.org/t/arbitrary-high-precision-optimisation-of-nlp/133973 "2026-01-05T16:59:15Z")

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I have solved a non-linear program with JuMP and IPopt. I want to refine the solution, but am limited by the Float64 precision. Therefore, I tried MadNLP and ExaModels, as they say that they support AbstarctFloat, see h…

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## [Incremental portfolio analytics (OnlinePortfolioAnalytics.jl)](https://discourse.julialang.org/t/incremental-portfolio-analytics-onlineportfolioanalytics-jl/113590)

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**Author:** [@FemtoTrader](https://discourse.julialang.org/u/FemtoTrader)\
**Replies:** 1\
**Last updated:** [January 5, 2026, 4:36pm UTC](https://discourse.julialang.org/t/incremental-portfolio-analytics-onlineportfolioanalytics-jl/113590 "2026-01-05T16:36:07Z")

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Hi, Sharing OnlinePortfolioAnalytics https://femtotrader.github.io/OnlinePortfolioAnalytics.jl/ This project aims to provide users with functionality for performing quantitative portfolio analytics via online algorithm…

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## [Creating efficient MOI wrapper for different cones and ordering them by types](https://discourse.julialang.org/t/creating-efficient-moi-wrapper-for-different-cones-and-ordering-them-by-types/130031)

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**Author:** [@yuwenchen95](https://discourse.julialang.org/u/yuwenchen95)\
**Replies:** 4\
**Last updated:** [January 5, 2026, 4:19pm UTC](https://discourse.julialang.org/t/creating-efficient-moi-wrapper-for-different-cones-and-ordering-them-by-types/130031 "2026-01-05T16:19:12Z")

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I’m considering to create a MOI wrapper for CuClarabel, where users can input different types of cones in arbitrary order while the MOI wrapper is able to order them in a predefined order and then pass it to CuClarabel. …

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## [Machine Learning and Deep Learning Course with Julia](https://discourse.julialang.org/t/machine-learning-and-deep-learning-course-with-julia/134890)

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**Author:** [@rajgoel](https://discourse.julialang.org/u/rajgoel)\
**Replies:** 1\
**Last updated:** [January 5, 2026, 4:13pm UTC](https://discourse.julialang.org/t/machine-learning-and-deep-learning-course-with-julia/134890 "2026-01-05T16:13:47Z")

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I created a course on Machine Learning and Deep Learning that is using Julia and Flux.jl in particular. I wanted the course to be mathematically precise while providing concise implementations that match the notation use…

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## [GPU support for Turing modeling with system of ODEs](https://discourse.julialang.org/t/gpu-support-for-turing-modeling-with-system-of-odes/77410)

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**Author:** [@vembha](https://discourse.julialang.org/u/vembha)\
**Replies:** 8\
**Last updated:** [January 5, 2026, 7:38am UTC](https://discourse.julialang.org/t/gpu-support-for-turing-modeling-with-system-of-odes/77410 "2026-01-05T07:38:43Z")

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Hello, I am trying to perform Bayesian analysis on a Turing model with an ecological ODE system embedded; consider it to be a complex variant of a Lotka-Volterra model. As of now, the code is running perfectly fine with…

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## [A tight formulation of a specific kind of convex PWL curve](https://discourse.julialang.org/t/a-tight-formulation-of-a-specific-kind-of-convex-pwl-curve/134822)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 3\
**Last updated:** [January 5, 2026, 3:56am UTC](https://discourse.julialang.org/t/a-tight-formulation-of-a-specific-kind-of-convex-pwl-curve/134822 "2026-01-05T03:56:25Z")

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I’ve read some piecewise linear (PWL)-related stuff from JuMP’s doc. It appears that I haven’t seen the particular formulation below, which I think is worth mentioning. It’s from the generation cost curve of generators …

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