# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=4

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

**Page:** 5

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## [SciML: Issues using \`GaussAdjoint\` on an \`EnsembleProblem\` with callbacks](https://discourse.julialang.org/t/sciml-issues-using-gaussadjoint-on-an-ensembleproblem-with-callbacks/137503)

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**Author:** [@LucasGrasso](https://discourse.julialang.org/u/LucasGrasso)\
**Replies:** 11\
**Last updated:** [June 21, 2026, 8:30pm UTC](https://discourse.julialang.org/t/sciml-issues-using-gaussadjoint-on-an-ensembleproblem-with-callbacks/137503 "2026-06-21T20:30:04Z")

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Hello there, I am rather new to Julia, and I am trying to implement a Neural ODE model that relies on event callbacks to terminate integration. I am using the GaussAdjoint, given that it supports callbacks and that it w…

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## [How can I keep a GLMakie window open?](https://discourse.julialang.org/t/how-can-i-keep-a-glmakie-window-open/137713)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 1\
**Last updated:** [June 20, 2026, 3:54pm UTC](https://discourse.julialang.org/t/how-can-i-keep-a-glmakie-window-open/137713 "2026-06-20T15:54:42Z")

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I switched from PythonPlot to GLMakie, and in PythonPlot, I could do: plt.show(block=true) at the end of a script that is run from the command line (not from the REPL) to keep the plot window open until the user closes…

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## [Nested submodels slow down Turing ~7x (Mooncake AD)](https://discourse.julialang.org/t/nested-submodels-slow-down-turing-7x-mooncake-ad/137679)

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**Author:** [@simonsteiger](https://discourse.julialang.org/u/simonsteiger)\
**Replies:** 5\
**Last updated:** [June 20, 2026, 2:30pm UTC](https://discourse.julialang.org/t/nested-submodels-slow-down-turing-7x-mooncake-ad/137679 "2026-06-20T14:30:36Z")

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I just discovered that nesting several submodels in Turing.jl seems to considerably slow down sampling (I only tried Mooncake.jl so far). The code below shows this with the eight schools dataset. I’ve deliberately made …

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## [Dyad 3.0 slower Transient Analysis](https://discourse.julialang.org/t/dyad-3-0-slower-transient-analysis/137148)

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**Author:** [@gruemelmonster](https://discourse.julialang.org/u/gruemelmonster)\
**Replies:** 12\
**Last updated:** [June 19, 2026, 5:19pm UTC](https://discourse.julialang.org/t/dyad-3-0-slower-transient-analysis/137148 "2026-06-19T17:19:26Z")

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Hi I just got greeted in VSCode with a message that made me update to Dyad 3.0… After using the AI to update my models I now realized that the TransientAnalysis is now much slower that before. (5min instead of 3min mayb…

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## [Update initialization guesses on an existing problem without rebuilding?](https://discourse.julialang.org/t/update-initialization-guesses-on-an-existing-problem-without-rebuilding/137694)

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**Author:** [@Bart\_van\_de\_Lint](https://discourse.julialang.org/u/Bart_van_de_Lint)\
**Replies:** 0\
**Last updated:** [June 19, 2026, 11:06am UTC](https://discourse.julialang.org/t/update-initialization-guesses-on-an-existing-problem-without-rebuilding/137694 "2026-06-19T11:06:55Z")

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I have a DAE built with ModelingToolkit. Between solves I re-initialize from a new operating point. For variables that have an initial constraint\*I can update them in place via the Initial parameter: prob.ps\[Initial(x)\]…

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## [Invalid Shapes error on creating ODEProblem from MTK system](https://discourse.julialang.org/t/invalid-shapes-error-on-creating-odeproblem-from-mtk-system/137671)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 2\
**Last updated:** [June 18, 2026, 8:00pm UTC](https://discourse.julialang.org/t/invalid-shapes-error-on-creating-odeproblem-from-mtk-system/137671 "2026-06-18T20:00:21Z")

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I have been running into this problem in many situations and am at a loss to figure it out. It always seems to occur with ifelse() statements, abs(), and the like. Unfortunately I have to have a lot of these types of sta…

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## [Backtesting framework](https://discourse.julialang.org/t/backtesting-framework/47351)

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**Author:** [@bicepjai](https://discourse.julialang.org/u/bicepjai)\
**Replies:** 48\
**Last updated:** [June 17, 2026, 5:03pm UTC](https://discourse.julialang.org/t/backtesting-framework/47351 "2026-06-17T17:03:12Z")

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There seems to be no maintained package for trading backtesting framework like a framewokr in python called backtrader I did come across dysonance/Strategems.jl JuliaQuant/TradingLogic.jl Anyone in the process of cre…

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## [Gridap use for finite element modelling for electrochemical electrode modelling](https://discourse.julialang.org/t/gridap-use-for-finite-element-modelling-for-electrochemical-electrode-modelling/135377)

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**Author:** [@algoking](https://discourse.julialang.org/u/algoking)\
**Replies:** 1\
**Last updated:** [June 17, 2026, 12:35pm UTC](https://discourse.julialang.org/t/gridap-use-for-finite-element-modelling-for-electrochemical-electrode-modelling/135377 "2026-06-17T12:35:11Z")

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Hi everyone, I am currently transitioning our lab’s electrochemical modeling workflow from COMSOL to Gridap.jl. My goal is to move away from proprietary licenses and leverage the flexibility of the Julia ecosystem. The…

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## [Projection of Gradient of Tensor object](https://discourse.julialang.org/t/projection-of-gradient-of-tensor-object/135467)

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**Author:** [@Ankan\_Man](https://discourse.julialang.org/u/Ankan_Man)\
**Replies:** 3\
**Last updated:** [June 17, 2026, 12:31pm UTC](https://discourse.julialang.org/t/projection-of-gradient-of-tensor-object/135467 "2026-06-17T12:31:26Z")

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Hi all. I am having an issue with projecting the derivative of a tensor on a sphere. This is the term in the weak form. Let P be the projector ( P = I - nxn). How to properly do the projection. Please help term = ∇(q) ⊙…

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## [MTK: @parameters vs. kwargs -- what is good practice?](https://discourse.julialang.org/t/mtk-parameters-vs-kwargs-what-is-good-practice/137633)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 8\
**Last updated:** [June 16, 2026, 11:32am UTC](https://discourse.julialang.org/t/mtk-parameters-vs-kwargs-what-is-good-practice/137633 "2026-06-16T11:32:03Z")

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What is good practice when it comes to use of @parameters and kwargs in “component types”? To make my question concrete, consider the following “component type” (is that the proper term? – this is not meant as a “seriou…

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## [Splited ODE system in ModelingToolkit](https://discourse.julialang.org/t/splited-ode-system-in-modelingtoolkit/101258)

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**Author:** [@sabbraxcaddabra](https://discourse.julialang.org/u/sabbraxcaddabra)\
**Replies:** 4\
**Last updated:** [June 15, 2026, 10:45pm UTC](https://discourse.julialang.org/t/splited-ode-system-in-modelingtoolkit/101258 "2026-06-15T22:45:06Z")

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I have a simple system of equations: dx\_dt = k \* x + l \* y dy\_dt = n \* x + m \* y and I want to compute right side functions separately: dx\_dt = f1(t, x, y) + f2(t, x, y) dy\_dt = f3(t, x, y) + f4(t, x, y) Example is s…

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## [Makie | ComputeGraph code example?](https://discourse.julialang.org/t/makie-computegraph-code-example/137629)

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**Author:** [@Audrius-St](https://discourse.julialang.org/u/Audrius-St)\
**Replies:** 2\
**Last updated:** [June 15, 2026, 6:00pm UTC](https://discourse.julialang.org/t/makie-computegraph-code-example/137629 "2026-06-15T18:00:25Z")

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Hello, Having read the Makie ComputeGraph documentation I find it a bit abstract for me to understand without a worked example. Searching through Julia Discourse I only found only found a few inconclusive discussions t…

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## [\[HTTP\] http tls handshake error with bit.ly redirects](https://discourse.julialang.org/t/http-http-tls-handshake-error-with-bit-ly-redirects/137595)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 3\
**Last updated:** [June 15, 2026, 5:28pm UTC](https://discourse.julialang.org/t/http-http-tls-handshake-error-with-bit-ly-redirects/137595 "2026-06-15T17:28:43Z")

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As from the title. using HTTP dataURL = "https://bit.ly/apress\_julia\_boston" data = @pipe HTTP.get(dataURL).body results in: ERROR: http tls handshake error: tls handshake failed: tls: certificate is not valid for …

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## [ANN: JuMP-dev 2026 talk recordings](https://discourse.julialang.org/t/ann-jump-dev-2026-talk-recordings/137627)

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**Author:** [@odow](https://discourse.julialang.org/u/odow)\
**Replies:** 0\
**Last updated:** [June 14, 2026, 10:27pm UTC](https://discourse.julialang.org/t/ann-jump-dev-2026-talk-recordings/137627 "2026-06-14T22:27:41Z")

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Hi all, Talk recordings from JuMP-dev 2026 are rolling out on this playlist. Check them out here: Cheers, Oscar

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## [Improved CFD solver?](https://discourse.julialang.org/t/improved-cfd-solver/135082)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 24\
**Last updated:** [June 14, 2026, 6:28pm UTC](https://discourse.julialang.org/t/improved-cfd-solver/135082 "2026-06-14T18:28:49Z")

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While there are a few CFD solvers in Julia, like ViscousFlow.jl and WaterLily.jl, the field of usage is somewhat limited: As far as I understand, WaterLily works well only for low Reynolds numbers. Is there anybody else …

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## [QCD paper using Julia](https://discourse.julialang.org/t/qcd-paper-using-julia/137620)

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**Author:** [@LeePhillips](https://discourse.julialang.org/u/LeePhillips)\
**Replies:** 0\
**Last updated:** [June 14, 2026, 3:25pm UTC](https://discourse.julialang.org/t/qcd-paper-using-julia/137620 "2026-06-14T15:25:23Z")

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“Numerical Hints for Dyon Condensation at θ=2π via Wilson-'t Hooft Loops in SU(2) Yang-Mills Theory” For those collecting science papers using Julia (or who have an interest in HEP theory). Uses the JuliaQCD package.

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## [Plotting polygons defined in degrees](https://discourse.julialang.org/t/plotting-polygons-defined-in-degrees/137556)

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**Author:** [@Mastomaki](https://discourse.julialang.org/u/Mastomaki)\
**Replies:** 14\
**Last updated:** [June 12, 2026, 9:26am UTC](https://discourse.julialang.org/t/plotting-polygons-defined-in-degrees/137556 "2026-06-12T09:26:26Z")

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I’m trying to plot the polygons from GADM.jl. I do the following: using GeoTables using GeoArtifacts using Countries using DataFrames using Meshes using GLMakie using GeoMakie \> gdf = GADM.get("FIN"; level=0) \> p = re…

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## [How to manage memory when using JuMP+Gurobi?](https://discourse.julialang.org/t/how-to-manage-memory-when-using-jump-gurobi/136807)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 10\
**Last updated:** [June 11, 2026, 9:18pm UTC](https://discourse.julialang.org/t/how-to-manage-memory-when-using-jump-gurobi/136807 "2026-06-11T21:18:30Z")

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Observe this usr@usr:~/julia\_projects/uc/Uc$ julia --project=. --threads=1,0 \_ \_ \_ \_(\_)\_ | Documentation: https://docs.julialang.org (\_) | (\_) (\_) | \_ \_ \_| |\_ \_\_ \_ | Type "…

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## [Changes in mtkcompile between v9.54 and v11.26](https://discourse.julialang.org/t/changes-in-mtkcompile-between-v9-54-and-v11-26/137536)

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**Author:** [@rveynde](https://discourse.julialang.org/u/rveynde)\
**Replies:** 3\
**Last updated:** [June 11, 2026, 1:05am UTC](https://discourse.julialang.org/t/changes-in-mtkcompile-between-v9-54-and-v11-26/137536 "2026-06-11T01:05:40Z")

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I am in the process of updating from MTK version 9.54 to 11.26 for my model. In general it looks like many things have sped up, which is great! There is one issue that I’m running into, namely that during mtkcompile I n…

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## [Is there a general guide to Julia's PDE solving utilities based on the properties of the PDE in question?](https://discourse.julialang.org/t/is-there-a-general-guide-to-julias-pde-solving-utilities-based-on-the-properties-of-the-pde-in-question/137545)

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**Author:** [@ducksoverip](https://discourse.julialang.org/u/ducksoverip)\
**Replies:** 2\
**Last updated:** [June 10, 2026, 7:30pm UTC](https://discourse.julialang.org/t/is-there-a-general-guide-to-julias-pde-solving-utilities-based-on-the-properties-of-the-pde-in-question/137545 "2026-06-10T19:30:56Z")

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As I continue my foray into Julia, I’d like to apply it more directly to my research by utilizing its PDE-solving capabilities to solve the radial Schrodinger equation for one and two-electron systems, with an eye toward…

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## [MTK mtkcompile "fully\_determined" kwarg unexpected behavior](https://discourse.julialang.org/t/mtk-mtkcompile-fully-determined-kwarg-unexpected-behavior/137408)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 3\
**Last updated:** [June 10, 2026, 5:19pm UTC](https://discourse.julialang.org/t/mtk-mtkcompile-fully-determined-kwarg-unexpected-behavior/137408 "2026-06-10T17:19:52Z")

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Hi all, I’m not sure if bug or not, but setting the fully\_determined keyword argument to true on mtkcompile results in a compilation error, whereas setting it to false results in what seems to be a valid system, with an…

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## [Speeding up antialiased non-linearity](https://discourse.julialang.org/t/speeding-up-antialiased-non-linearity/137456)

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**Author:** [@fps](https://discourse.julialang.org/u/fps)\
**Replies:** 2\
**Last updated:** [June 10, 2026, 7:30am UTC](https://discourse.julialang.org/t/speeding-up-antialiased-non-linearity/137456 "2026-06-10T07:30:54Z")

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Hi, I’m playing around with some guitar amplifier modeling and in the course of that I implemented the anti-derivative anti-aliased non-linearity of “Note on Alias Suppression in Digital Distortion”, Martin Vicanek in a…

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## [MTK libaries & initial values vs. initial guesses?](https://discourse.julialang.org/t/mtk-libaries-initial-values-vs-initial-guesses/137443)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 19\
**Last updated:** [June 9, 2026, 11:53pm UTC](https://discourse.julialang.org/t/mtk-libaries-initial-values-vs-initial-guesses/137443 "2026-06-09T23:53:39Z")

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In MTK libraries, should I include “hard-coded” initial values in components, or not? I’m toying with an alpha version of a library based on MTK, and have now come to the stage of testing whether I can linearize the com…

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## [Starting to learn about optimization](https://discourse.julialang.org/t/starting-to-learn-about-optimization/137481)

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**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 11\
**Last updated:** [June 9, 2026, 1:37pm UTC](https://discourse.julialang.org/t/starting-to-learn-about-optimization/137481 "2026-06-09T13:37:43Z")

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I’m considering tackling a problem that appears to have a fixed handful of cutoffs and a performance metric, so I started reading a bit about optimization with essentially zero initial knowledge (not sure ordinary least …

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## [StructuralIdentifiability.jl for more complicated systems](https://discourse.julialang.org/t/structuralidentifiability-jl-for-more-complicated-systems/137381)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 5\
**Last updated:** [June 9, 2026, 9:37am UTC](https://discourse.julialang.org/t/structuralidentifiability-jl-for-more-complicated-systems/137381 "2026-06-09T09:37:58Z")

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Hi all, I am looking at StructuralIdentifiability.jl along with ModelingToolkit.jl to see what I can do with it. Ideally, I would use it to first find out which parameters in my models are actually identifiable, and then…

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## [Trouble using @compact along reactant.jl](https://discourse.julialang.org/t/trouble-using-compact-along-reactant-jl/137497)

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**Author:** [@yjr](https://discourse.julialang.org/u/yjr)\
**Replies:** 4\
**Last updated:** [June 8, 2026, 5:27pm UTC](https://discourse.julialang.org/t/trouble-using-compact-along-reactant-jl/137497 "2026-06-08T17:27:30Z")

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Hello, I’m trying to set a simple network as described by the code below, but when I compiled it to GPU using reactant.jl it works if the sequence dimension (2nd dimension) is smaller than 100, but if I grow it bigger i…

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## [\[ANN\] Training course “Julia for HPC” in Stuttgart, Germany on Sep 29-Oct 2, 2026](https://discourse.julialang.org/t/ann-training-course-julia-for-hpc-in-stuttgart-germany-on-sep-29-oct-2-2026/137435)

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**Author:** [@carstenbauer](https://discourse.julialang.org/u/carstenbauer)\
**Replies:** 2\
**Last updated:** [June 8, 2026, 12:07pm UTC](https://discourse.julialang.org/t/ann-training-course-julia-for-hpc-in-stuttgart-germany-on-sep-29-oct-2-2026/137435 "2026-06-08T12:07:30Z")

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For the fifth year in a row (see e.g. here or here or here) I’m pleased to annouce that there will be another opportunity to learn more about using Julia for high-performance computing this fall! In collaboration with t…

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## [Makie | volumeslices!: combining synchronized rotation, etc. with sliders and toggles](https://discourse.julialang.org/t/makie-volumeslices-combining-synchronized-rotation-etc-with-sliders-and-toggles/137488)

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**Author:** [@Audrius-St](https://discourse.julialang.org/u/Audrius-St)\
**Replies:** 0\
**Last updated:** [June 8, 2026, 4:30am UTC](https://discourse.julialang.org/t/makie-volumeslices-combining-synchronized-rotation-etc-with-sliders-and-toggles/137488 "2026-06-08T04:30:20Z")

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Hello, I adapted the following code to synchronize rotations, translations, and zoom between two 3D LScene volumeslices! as in the MNWE code below: https://discourse.julialang.org/t/makie-linking-cameras-in-multiple-3d…

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## [How to insert an interactive condition inside a Makie recipe?](https://discourse.julialang.org/t/how-to-insert-an-interactive-condition-inside-a-makie-recipe/137482)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 6\
**Last updated:** [June 7, 2026, 6:04pm UTC](https://discourse.julialang.org/t/how-to-insert-an-interactive-condition-inside-a-makie-recipe/137482 "2026-06-07T18:04:27Z")

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The following MWE is self-explanatory: using GLMakie import Makie # define recipe with condition "showlines" Makie.@recipe(MyPlot, x, y) do scene Makie.Attributes(; showlines=true ) end # toggle between scatte…

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## [How to call multiple Makie recipes for heterogeneous collections?](https://discourse.julialang.org/t/how-to-call-multiple-makie-recipes-for-heterogeneous-collections/137483)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 2\
**Last updated:** [June 7, 2026, 4:29pm UTC](https://discourse.julialang.org/t/how-to-call-multiple-makie-recipes-for-heterogeneous-collections/137483 "2026-06-07T16:29:52Z")

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The MWE is self-explanatory: using GLMakie import Makie # type hierarchy abstract type G end struct G1 \<: G end struct G2 \<: G end # define recipe for vector of G Makie.@recipe(MyPlot, gs) do scene Makie.Attributes(…

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