# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=19

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**Page:** 20

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## [Using MTK when I \*import\* ModelingToolkit?](https://discourse.julialang.org/t/using-mtk-when-i-import-modelingtoolkit/133681)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 42\
**Last updated:** [November 13, 2025, 9:18am UTC](https://discourse.julialang.org/t/using-mtk-when-i-import-modelingtoolkit/133681 "2025-11-13T09:18:20Z")

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I have some ModelingToolkit model that works when importing via using. Because of a name conflict, I need to import MTK as import ModelingToolkit as mtk instead. The following code works with using.... What modifications…

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## [Adaptation of Julia for production and execution in trading](https://discourse.julialang.org/t/adaptation-of-julia-for-production-and-execution-in-trading/66628)

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**Author:** [@AMJ](https://discourse.julialang.org/u/AMJ)\
**Replies:** 8\
**Last updated:** [November 13, 2025, 7:45am UTC](https://discourse.julialang.org/t/adaptation-of-julia-for-production-and-execution-in-trading/66628 "2025-11-13T07:45:51Z")

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Came across this topic in algotrading subreddit, I was surprised not to see even one mention of Julia. It would be understanding if it’s a big fund as they usually have their own infrastructure in C++ wrapped in python b…

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## [Operator-split chemistry solve in GPU-resident CFD code using DiffEqGPU](https://discourse.julialang.org/t/operator-split-chemistry-solve-in-gpu-resident-cfd-code-using-diffeqgpu/133687)

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**Author:** [@ColinTowery](https://discourse.julialang.org/u/ColinTowery)\
**Replies:** 5\
**Last updated:** [November 12, 2025, 7:57pm UTC](https://discourse.julialang.org/t/operator-split-chemistry-solve-in-gpu-resident-cfd-code-using-diffeqgpu/133687 "2025-11-12T19:57:24Z")

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Hi, I’m looking to see if there is any way I could solve an ensemble of ODEs similar to using the low-level API of EnsembleGPUKernel in DiffEqGPU, but where the ensemble trajectories are pulled from a multi-dimensional …

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## [How to correctly use Lux and Training API with reactant?](https://discourse.julialang.org/t/how-to-correctly-use-lux-and-training-api-with-reactant/133799)

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**Author:** [@rkube](https://discourse.julialang.org/u/rkube)\
**Replies:** 3\
**Last updated:** [November 12, 2025, 6:04pm UTC](https://discourse.julialang.org/t/how-to-correctly-use-lux-and-training-api-with-reactant/133799 "2025-11-12T18:04:09Z")

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Hi, I’m trying to train neural networks with Lux, Reactant, and the Training API and am confused about how to tie it together. When I’m compiling a model with reactant, should I still use the TrainState API? I tried …

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## [Latest CUDA.jl version 5.8.3 fails to install on NVIDIA Jetson Orin with Jetpack 6.2.1+b38](https://discourse.julialang.org/t/latest-cuda-jl-version-5-8-3-fails-to-install-on-nvidia-jetson-orin-with-jetpack-6-2-1-b38/132059)

<div class="topic-metadata">

**Author:** [@rovitotv](https://discourse.julialang.org/u/rovitotv)\
**Replies:** 6\
**Last updated:** [November 12, 2025, 10:07am UTC](https://discourse.julialang.org/t/latest-cuda-jl-version-5-8-3-fails-to-install-on-nvidia-jetson-orin-with-jetpack-6-2-1-b38/132059 "2025-11-12T10:07:59Z")

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Greetings, I am trying to install CUDA.jl on a NVIDIA Jetson Orin. The installation fails with many errors captured below. I would NOT like to use CUDA via artifact and use CUDA installed on the system but when I add …

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## [Quantile Random Forest in Julia?](https://discourse.julialang.org/t/quantile-random-forest-in-julia/133383)

<div class="topic-metadata">

**Author:** [@allixender](https://discourse.julialang.org/u/allixender)\
**Replies:** 1\
**Last updated:** [November 12, 2025, 4:42am UTC](https://discourse.julialang.org/t/quantile-random-forest-in-julia/133383 "2025-11-12T04:42:11Z")

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Hi there, I have played a bit with DecisionTree.jl and MJL.jl. Now I would like to get some uncertainty quantification for my RandomForest regressions. I have seen that Quantile Random Forest is an increasingly accepte…

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## [\`Initial guess is not an interior point\` in optimization methods](https://discourse.julialang.org/t/initial-guess-is-not-an-interior-point-in-optimization-methods/133727)

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**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 10\
**Last updated:** [November 12, 2025, 4:37am UTC](https://discourse.julialang.org/t/initial-guess-is-not-an-interior-point-in-optimization-methods/133727 "2025-11-12T04:37:47Z")

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I’m using Optim.jl via Optimization.jl and hitting Initial guess is not an interior point. I get that I could/should change my initial condition, but I’d like a general solution that works in general whenever a solution …

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## [Wrap my function in an MTK component](https://discourse.julialang.org/t/wrap-my-function-in-an-mtk-component/133767)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 7\
**Last updated:** [November 12, 2025, 2:22am UTC](https://discourse.julialang.org/t/wrap-my-function-in-an-mtk-component/133767 "2025-11-12T02:22:13Z")

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I am trying to wrap an arbitrary function in an MTK component and I am a bit lost in all the possibilities available these days. Right now I have: seconds\_to\_datetime(t, t0::DateTime) = t0 + Millisecond(round(Int, t \* …

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## [Partial Least Squares](https://discourse.julialang.org/t/partial-least-squares/133742)

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**Author:** [@eweiss](https://discourse.julialang.org/u/eweiss)\
**Replies:** 2\
**Last updated:** [November 11, 2025, 10:08pm UTC](https://discourse.julialang.org/t/partial-least-squares/133742 "2025-11-11T22:08:40Z")

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I want to experiment with partial least squares regressions. My research points to lalvim’s PartialLeastSquaresRegressor as the only package with PLSR, but when I run Example 1, PLSRegressor() isn’t found. If there is …

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## [How to pair together a Lines and a Band plot in Makie?](https://discourse.julialang.org/t/how-to-pair-together-a-lines-and-a-band-plot-in-makie/133800)

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**Author:** [@Abhro](https://discourse.julialang.org/u/Abhro)\
**Replies:** 2\
**Last updated:** [November 11, 2025, 10:08pm UTC](https://discourse.julialang.org/t/how-to-pair-together-a-lines-and-a-band-plot-in-makie/133800 "2025-11-11T22:08:19Z")

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I have two dataseries where each of them also has associated uncertainty. I’m plotting the uncertainty as a translucent envelope around the main line plot of the series. When using GLMakie/WGLMakie to interact with the …

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## [MTK & units](https://discourse.julialang.org/t/mtk-units/133795)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 1\
**Last updated:** [November 11, 2025, 6:14pm UTC](https://discourse.julialang.org/t/mtk-units/133795 "2025-11-11T18:14:21Z")

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In the past, I have more or less converted units manually, but have now started to use Unitful.jl – which also ties into Plots.jl and gives convenient typesetting of units along the axes. To me, there are at least 3 rea…

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## [Simulate ModelingToolkit system with different parameters](https://discourse.julialang.org/t/simulate-modelingtoolkit-system-with-different-parameters/133791)

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**Author:** [@JaviJR](https://discourse.julialang.org/u/JaviJR)\
**Replies:** 7\
**Last updated:** [November 11, 2025, 3:51pm UTC](https://discourse.julialang.org/t/simulate-modelingtoolkit-system-with-different-parameters/133791 "2025-11-11T15:51:08Z")

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Hi all, In the past day, I have been reading the documentation on efficiently simulating ModelingToolkit models with different parameters. However, I find the documentation somewhat complex, especially for new users. In…

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## [The output of Gurobi's solution isn't qualified as its own input in terms of feasibility](https://discourse.julialang.org/t/the-output-of-gurobis-solution-isnt-qualified-as-its-own-input-in-terms-of-feasibility/133785)

<div class="topic-metadata">

**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 8\
**Last updated:** [November 11, 2025, 7:20am UTC](https://discourse.julialang.org/t/the-output-of-gurobis-solution-isnt-qualified-as-its-own-input-in-terms-of-feasibility/133785 "2025-11-11T07:20:52Z")

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I write decomposition algorithms with the Gurobi solver, so occasionally I need to use Gurobi’s solution as data input to another model, which is also solved by Gurobi. But I find it annoying that the “$THE\_TITLE”. juli…

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## [Mixed integer problem](https://discourse.julialang.org/t/mixed-integer-problem/133624)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 17\
**Last updated:** [November 10, 2025, 10:37am UTC](https://discourse.julialang.org/t/mixed-integer-problem/133624 "2025-11-10T10:37:47Z")

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I attempt to define a mixed-integer optimization problem. To simplify the problem: I have 10 wind turbines. I have 10 boolean variables that indicate whether the turbine is operating at full or partial power. If it is o…

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## [Using dates as x axis in Makie.jl](https://discourse.julialang.org/t/using-dates-as-x-axis-in-makie-jl/133762)

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**Author:** [@elwwan](https://discourse.julialang.org/u/elwwan)\
**Replies:** 3\
**Last updated:** [November 10, 2025, 9:40am UTC](https://discourse.julialang.org/t/using-dates-as-x-axis-in-makie-jl/133762 "2025-11-10T09:40:06Z")

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Hello everyone, I am trying to plot brackets in Makie.jl while using dates as the x axis. Unfortunately it gives me an error since I can’t use Date() as an argument in bracket!(). Here is the code that causes the error…

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## [GPU memory issue on AMDGPU](https://discourse.julialang.org/t/gpu-memory-issue-on-amdgpu/133560)

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**Author:** [@Alexander-Barth](https://discourse.julialang.org/u/Alexander-Barth)\
**Replies:** 4\
**Last updated:** [November 10, 2025, 7:51am UTC](https://discourse.julialang.org/t/gpu-memory-issue-on-amdgpu/133560 "2025-11-10T07:51:57Z")

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I am trying to train a neural network and make inference using this neural network with Lux (1.22.1) AMDGPU (2.1.1) and julia (1.12.0). The AMDGPU version kernel driver is 6.3.6 (as reported by /sys/module/amdgpu/versio…

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## [Banded Jacobian of the constraints](https://discourse.julialang.org/t/banded-jacobian-of-the-constraints/133766)

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**Author:** [@Ceserik](https://discourse.julialang.org/u/Ceserik)\
**Replies:** 4\
**Last updated:** [November 10, 2025, 6:22am UTC](https://discourse.julialang.org/t/banded-jacobian-of-the-constraints/133766 "2025-11-10T06:22:04Z")

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Hello, I am using JuMP for solving optimal control of a car on a track. I am trying to reformulate my problem, to improve the sparsity pattern of jacobian of constraints and Hessian of Lagrangian. I have managed to get …

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## [Help refining an MINLP and selecting an optimiser to make solving faster / possible](https://discourse.julialang.org/t/help-refining-an-minlp-and-selecting-an-optimiser-to-make-solving-faster-possible/133758)

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**Author:** [@HarrisonWilde](https://discourse.julialang.org/u/HarrisonWilde)\
**Replies:** 4\
**Last updated:** [November 10, 2025, 12:00am UTC](https://discourse.julialang.org/t/help-refining-an-minlp-and-selecting-an-optimiser-to-make-solving-faster-possible/133758 "2025-11-10T00:00:06Z")

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I am building a problem that involves making choices on which of two levers (or both) to intervene on products in a portfolio to alter their characteristics in order to attain a target average “score” value derived from …

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## [How to call ssyevd](https://discourse.julialang.org/t/how-to-call-ssyevd/133496)

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**Author:** [@billmclean](https://discourse.julialang.org/u/billmclean)\
**Replies:** 2\
**Last updated:** [November 9, 2025, 10:21pm UTC](https://discourse.julialang.org/t/how-to-call-ssyevd/133496 "2025-11-09T22:21:54Z")

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I am trying to figure out how to call rocsolver\_ssyevd to compute the eigenvalues of a symmetric matrix. If I run the code using AMDGPU import AMDGPU.rocBLAS: rocblas\_int, handle import AMDGPU.rocSOLVER: rocsolver\_ssye…

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## [Modelling toolkit for simulating aerodynamics?](https://discourse.julialang.org/t/modelling-toolkit-for-simulating-aerodynamics/133739)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 1\
**Last updated:** [November 9, 2025, 4:26pm UTC](https://discourse.julialang.org/t/modelling-toolkit-for-simulating-aerodynamics/133739 "2025-11-09T16:26:14Z")

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Not so clear to me: What is the domain of MTK where using MTK to create models is a good choice? In particular, we have a package for modelling aerodynamic forces and moments of 3D wings: GitHub - OpenSourceAWE/VortexSt…

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## [How to visualize infinite lines with Makie.jl?](https://discourse.julialang.org/t/how-to-visualize-infinite-lines-with-makie-jl/100325)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 9\
**Last updated:** [November 8, 2025, 10:56pm UTC](https://discourse.julialang.org/t/how-to-visualize-infinite-lines-with-makie-jl/100325 "2025-11-08T22:56:32Z")

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Say I have an infinite line passing through the points (0,0,0) and (1,1,1) in 3D. How to visualize this line in Makie so that it is always visible no matter the level of zoom?

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## [Decompression of large files](https://discourse.julialang.org/t/decompression-of-large-files/132191)

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**Author:** [@mdotend](https://discourse.julialang.org/u/mdotend)\
**Replies:** 11\
**Last updated:** [November 8, 2025, 6:40pm UTC](https://discourse.julialang.org/t/decompression-of-large-files/132191 "2025-11-08T18:40:51Z")

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Hey there, I am currently trying to work with dumps of reddit data which is alot of compressed json data in the zst format (e.g. 11GB for one month of submissions). When I try to read lines from that data I get an unspe…

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## [Has anyone tried implementing the LiMuon Optimizer?](https://discourse.julialang.org/t/has-anyone-tried-implementing-the-limuon-optimizer/132742)

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**Author:** [@DoktorMike](https://discourse.julialang.org/u/DoktorMike)\
**Replies:** 2\
**Last updated:** [November 7, 2025, 8:33pm UTC](https://discourse.julialang.org/t/has-anyone-tried-implementing-the-limuon-optimizer/132742 "2025-11-07T20:33:54Z")

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Has anyone tried implementing the LiMuon optimizer? I made an issue here in the Optimisers.jl package but thought I’d ask here as well if someone has implemented it elsewhere? Also any hands on experience with the metho…

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## [Issue with SS.solve using DynamicSS method in SteadyStateDiffEq](https://discourse.julialang.org/t/issue-with-ss-solve-using-dynamicss-method-in-steadystatediffeq/133712)

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**Author:** [@Bill\_Holmes](https://discourse.julialang.org/u/Bill_Holmes)\
**Replies:** 3\
**Last updated:** [November 7, 2025, 5:13pm UTC](https://discourse.julialang.org/t/issue-with-ss-solve-using-dynamicss-method-in-steadystatediffeq/133712 "2025-11-07T17:13:21Z")

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I have a quick question about using SteadyStateDiffEq.jl. I am getting error behavior when trying to use the DynamicSS method (following Steady State Solvers · DifferentialEquations.jl). Below is a MWE. I 1) define a sta…

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## [Wrapping CUDA.jl with juliacall](https://discourse.julialang.org/t/wrapping-cuda-jl-with-juliacall/133554)

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**Author:** [@chrissm23](https://discourse.julialang.org/u/chrissm23)\
**Replies:** 4\
**Last updated:** [November 7, 2025, 9:09am UTC](https://discourse.julialang.org/t/wrapping-cuda-jl-with-juliacall/133554 "2025-11-07T09:09:08Z")

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Hello everyone! I’m trying to make a Python wrapper using PythonCall.jl for a Julia package that uses CUDA.jl. The package initializes random integers from a UnitRange using the CPU’s Random.rand into a Matrix and then …

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## [R in Julia on Android works great :-) (Screenshot)](https://discourse.julialang.org/t/r-in-julia-on-android-works-great-screenshot/133719)

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**Author:** [@Mike\_Stein](https://discourse.julialang.org/u/Mike_Stein)\
**Replies:** 2\
**Last updated:** [November 6, 2025, 11:12pm UTC](https://discourse.julialang.org/t/r-in-julia-on-android-works-great-screenshot/133719 "2025-11-06T23:12:40Z")

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Having fun with Julia and R setup in Termux on Android with RCall julia library and being able to toggle in between them. For some reason not able to install.packages in R in Julia but not a big deal since can just inst…

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## [Electric Field Simulation Cyclotron](https://discourse.julialang.org/t/electric-field-simulation-cyclotron/133708)

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**Author:** [@mpirke](https://discourse.julialang.org/u/mpirke)\
**Replies:** 0\
**Last updated:** [November 6, 2025, 12:48pm UTC](https://discourse.julialang.org/t/electric-field-simulation-cyclotron/133708 "2025-11-06T12:48:57Z")

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Hi there! I recently gave a tutorial for a physics course, where we discussed how a cyclotron works. Often one reads that in the gap between the electrodes the electric field is uniform, similar to a plate capacitor and…

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## [Basic Molly questions](https://discourse.julialang.org/t/basic-molly-questions/133282)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 35\
**Last updated:** [November 6, 2025, 10:33am UTC](https://discourse.julialang.org/t/basic-molly-questions/133282 "2025-11-06T10:33:29Z")

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I’m playing around with Molly.jl. Not really my field, but some colleagues worked with molecule simulations in the 1990s, so I have been exposed to the basic ideas. I also simulated a set of 5 Argon molecules in 2D, boxe…

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## [How to reinit NonlinearSolve.jl problem/integrator?](https://discourse.julialang.org/t/how-to-reinit-nonlinearsolve-jl-problem-integrator/109536)

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**Author:** [@jamblejoe](https://discourse.julialang.org/u/jamblejoe)\
**Replies:** 5\
**Last updated:** [November 5, 2025, 11:47pm UTC](https://discourse.julialang.org/t/how-to-reinit-nonlinearsolve-jl-problem-integrator/109536 "2025-11-05T23:47:14Z")

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Consider f(u, p) = u .\* u .- p u0 = @SVector\[1.0, 1.0\] prob = NonlinearProblem(f, u0, \[1\]) solver = solve(prob) How do I reinitialize the problem or the underlying integrator/cache with new u0 and p?

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## [Trouble using ParametricOptInterface when a parameter appears inside a min() expression in JuMP](https://discourse.julialang.org/t/trouble-using-parametricoptinterface-when-a-parameter-appears-inside-a-min-expression-in-jump/133661)

<div class="topic-metadata">

**Author:** [@leo.ch.97](https://discourse.julialang.org/u/leo.ch.97)\
**Replies:** 2\
**Last updated:** [November 4, 2025, 7:03pm UTC](https://discourse.julialang.org/t/trouble-using-parametricoptinterface-when-a-parameter-appears-inside-a-min-expression-in-jump/133661 "2025-11-04T19:03:27Z")

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Hi everyone! I’m trying to extend a large (mixed-integer) linear model to handle Parameters, using the ParametricOptInterface.jl package. However, I’m running into an issue when a parameter is used inside a min() funct…

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