# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=16

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**Page:** 17

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## [How to solve or optimize a mixed problem?](https://discourse.julialang.org/t/how-to-solve-or-optimize-a-mixed-problem/134465)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 2\
**Last updated:** [December 17, 2025, 9:44pm UTC](https://discourse.julialang.org/t/how-to-solve-or-optimize-a-mixed-problem/134465 "2025-12-17T21:44:24Z")

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I have the following problem: a wind farm uncontrolled input: time and location-dependent wind speed control input: time-dependent induction factor set values: time-dependent power demand output: total power For simpl…

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## [Makie - trouble using both a slider and textbox to change a number](https://discourse.julialang.org/t/makie-trouble-using-both-a-slider-and-textbox-to-change-a-number/73276)

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**Author:** [@JoshL](https://discourse.julialang.org/u/JoshL)\
**Replies:** 1\
**Last updated:** [December 17, 2025, 8:29pm UTC](https://discourse.julialang.org/t/makie-trouble-using-both-a-slider-and-textbox-to-change-a-number/73276 "2025-12-17T20:29:34Z")

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I’m running into some issues trying to use Makie to visualize some of my data using Julia 1.6.0. I’ve created a toy example below that illustrates the problem. In the example, I have a number between 0 and 1, and I want …

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## [Matrix multiplication fails with Reactant and Lux](https://discourse.julialang.org/t/matrix-multiplication-fails-with-reactant-and-lux/134612)

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**Author:** [@weltenbummler](https://discourse.julialang.org/u/weltenbummler)\
**Replies:** 2\
**Last updated:** [December 17, 2025, 4:34pm UTC](https://discourse.julialang.org/t/matrix-multiplication-fails-with-reactant-and-lux/134612 "2025-12-17T16:34:06Z")

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Hello, I have this simple script: using LinearAlgebra using Reactant using Lux dev = reactant\_device() #dev = cpu\_device() A = dev(rand(Float32, 2, 2)) B = dev(rand(Float32, 2, 3)) A \* B # ERROR: conversion to point…

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## [Failed to precompile CUDA](https://discourse.julialang.org/t/failed-to-precompile-cuda/134255)

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**Author:** [@WuSiren](https://discourse.julialang.org/u/WuSiren)\
**Replies:** 14\
**Last updated:** [December 16, 2025, 10:59pm UTC](https://discourse.julialang.org/t/failed-to-precompile-cuda/134255 "2025-12-16T22:59:21Z")

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julia\> using CUDA ┌ Warning: Circular dependency detected. Precompilation will be skipped for: │ SparseArraysExt \[85068d23-b5fb-53f1-8204-05c2aba6942f\] │ AtomixCUDAExt \[13011619-4c7c-5ef0-948f-5fc81565cd05\] │ Linea…

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## [Zoom, translate, rotate and save](https://discourse.julialang.org/t/zoom-translate-rotate-and-save/134526)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 3\
**Last updated:** [December 13, 2025, 2:38pm UTC](https://discourse.julialang.org/t/zoom-translate-rotate-and-save/134526 "2025-12-13T14:38:10Z")

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I also want to create many 3D plots. I will zoom and rotate each to same extent and then save them. How to do it? How to translate and rotate by code? What is range of value that we can supply in zoom!() line end? usi…

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## [Markovian SDDP: is a finite and concrete scenario tree necessary?](https://discourse.julialang.org/t/markovian-sddp-is-a-finite-and-concrete-scenario-tree-necessary/134317)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 12\
**Last updated:** [December 13, 2025, 3:27am UTC](https://discourse.julialang.org/t/markovian-sddp-is-a-finite-and-concrete-scenario-tree-necessary/134317 "2025-12-13T03:27:14Z")

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(I kinda forget these knowledge) I asked chatGPT this question is it a prerequisite to restrict the number of uncertainty realizations in each stage to be finite, if I adopt a Markov-SDDP algorithm to tackle a multist…

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## [Saving Makie plot as is on the screen?](https://discourse.julialang.org/t/saving-makie-plot-as-is-on-the-screen/24276)

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**Author:** [@cserteGT3](https://discourse.julialang.org/u/cserteGT3)\
**Replies:** 8\
**Last updated:** [December 12, 2025, 9:02pm UTC](https://discourse.julialang.org/t/saving-makie-plot-as-is-on-the-screen/24276 "2025-12-12T21:02:02Z")

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I noticed that if I plot something with Makie, then zoom-pan in the GUI, then I save with Makie.save(), the originally plotted “version” will be saved. I understand this behaviour. But, is there a way to save the plot a…

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## [Issue with Binomial distribution and recent ForwardDiff versions](https://discourse.julialang.org/t/issue-with-binomial-distribution-and-recent-forwarddiff-versions/134347)

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**Author:** [@Pablo\_Marchant](https://discourse.julialang.org/u/Pablo_Marchant)\
**Replies:** 2\
**Last updated:** [December 12, 2025, 3:57pm UTC](https://discourse.julialang.org/t/issue-with-binomial-distribution-and-recent-forwarddiff-versions/134347 "2025-12-12T15:57:48Z")

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Hi, recently I noticed some code I’ve been using broke after updating Forward Diff. The issue came from sampling with Turing using a binomial likelihood. Digging into it it boiled down to this: using ForwardDiff using …

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## [Retrieve current solution when termination\_status is TIME\_LIMIT](https://discourse.julialang.org/t/retrieve-current-solution-when-termination-status-is-time-limit/134464)

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**Author:** [@marilena](https://discourse.julialang.org/u/marilena)\
**Replies:** 7\
**Last updated:** [December 12, 2025, 10:02am UTC](https://discourse.julialang.org/t/retrieve-current-solution-when-termination-status-is-time-limit/134464 "2025-12-12T10:02:56Z")

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Hello to the community! I am using Julia v1.9.3 , with packages JuMP v1.23.2 and Gurobi v1.3.1. I am solving an LP using Barrier, and I specify a time limit. gurobi\_env = Gurobi.Env() Solver = optimizer\_with\_attributes…

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## [Is ParametricOptInterface needed to define and use parameters in JuMP?](https://discourse.julialang.org/t/is-parametricoptinterface-needed-to-define-and-use-parameters-in-jump/134498)

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**Author:** [@zdenek\_hurak](https://discourse.julialang.org/u/zdenek_hurak)\
**Replies:** 4\
**Last updated:** [December 11, 2025, 11:12pm UTC](https://discourse.julialang.org/t/is-parametricoptinterface-needed-to-define-and-use-parameters-in-jump/134498 "2025-12-11T23:12:58Z")

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I feel puzzled when it comes to the role of ParametricOptInterface.jl (POI). I think I understand its general mission (in fact the motivating tutorial example Rolling horizon problems · JuMP directed me to it). But it ap…

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## [Learning a mapping from an image to an ODE](https://discourse.julialang.org/t/learning-a-mapping-from-an-image-to-an-ode/134456)

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**Author:** [@csvance](https://discourse.julialang.org/u/csvance)\
**Replies:** 4\
**Last updated:** [December 10, 2025, 6:00pm UTC](https://discourse.julialang.org/t/learning-a-mapping-from-an-image-to-an-ode/134456 "2025-12-10T18:00:06Z")

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I have trained a CNN to map an image to a sequence of feature vectors f\_v and I want to learn a function du(u, f\_v) that maps the feature vectors to an ODE. For each image I know how to compute both the function and firs…

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## [OrdinaryDiffEq with a mass\_matrix and jac\_prototype](https://discourse.julialang.org/t/ordinarydiffeq-with-a-mass-matrix-and-jac-prototype/134462)

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**Author:** [@bmxam](https://discourse.julialang.org/u/bmxam)\
**Replies:** 4\
**Last updated:** [December 10, 2025, 5:13pm UTC](https://discourse.julialang.org/t/ordinarydiffeq-with-a-mass-matrix-and-jac-prototype/134462 "2025-12-10T17:13:08Z")

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Hi everyone, Short story : see the MWE below. Using OrdinaryDiffEq, I’m trying to solve an ODE involving a mass\_matrix that (may) evolve depending on the solution, the time, the parameters. So I set up a SciMLOperators…

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## [How to setup Julia properly on Lxplus so that Julia Extension in VS Code works](https://discourse.julialang.org/t/how-to-setup-julia-properly-on-lxplus-so-that-julia-extension-in-vs-code-works/134254)

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**Author:** [@Aditya747S](https://discourse.julialang.org/u/Aditya747S)\
**Replies:** 4\
**Last updated:** [December 9, 2025, 1:11pm UTC](https://discourse.julialang.org/t/how-to-setup-julia-properly-on-lxplus-so-that-julia-extension-in-vs-code-works/134254 "2025-12-09T13:11:30Z")

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I have recently started using julia in lxplus and was wondering how to properly set it up. For example, is there a way to use the julia extension in lxplus, in order to run my julia files I currently have to give command…

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## [CUDA test failure](https://discourse.julialang.org/t/cuda-test-failure/134371)

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**Author:** [@aklocker](https://discourse.julialang.org/u/aklocker)\
**Replies:** 8\
**Last updated:** [December 9, 2025, 12:57pm UTC](https://discourse.julialang.org/t/cuda-test-failure/134371 "2025-12-09T12:57:47Z")

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Hi, I’m new to Julia and GPU computing. I installed CUDA and ran \]test CUDA to check it is working. When I do this I get the following errors: Info: Testing using device 0 (NVIDIA GH200 120GB). To change this, specify…

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## [Correctness Issue in NeuralOperators.jl: Mode truncation in SpectralConv excludes negative low-frequency modes](https://discourse.julialang.org/t/correctness-issue-in-neuraloperators-jl-mode-truncation-in-spectralconv-excludes-negative-low-frequency-modes/134403)

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**Author:** [@Azamat](https://discourse.julialang.org/u/Azamat)\
**Replies:** 2\
**Last updated:** [December 9, 2025, 8:26am UTC](https://discourse.julialang.org/t/correctness-issue-in-neuraloperators-jl-mode-truncation-in-spectralconv-excludes-negative-low-frequency-modes/134403 "2025-12-09T08:26:17Z")

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I was looking at the mode truncation logic in NeuralOperators.jl and have a question about correctness. Link: NeuralOperators.jl/src/transform.jl at 39f8a3c6dc974e711c8de8a8fde804e096098157 · SciML/NeuralOperators.jl · …

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## [Using Neural ODEs to learn a family of ODEs (with Automatic Differentiation)](https://discourse.julialang.org/t/using-neural-odes-to-learn-a-family-of-odes-with-automatic-differentiation/134348)

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**Author:** [@leespen1](https://discourse.julialang.org/u/leespen1)\
**Replies:** 13\
**Last updated:** [December 9, 2025, 1:59am UTC](https://discourse.julialang.org/t/using-neural-odes-to-learn-a-family-of-odes-with-automatic-differentiation/134348 "2025-12-09T01:59:34Z")

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I am running into issues when trying to use reverse-mode automatic differentiation via Zygote when trying to solve families of Given u(t), we can train a neural ODE to find the underlying ODE du/dt = f(u, t). For examp…

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## [ANN: JuMP-dev 2025 videos](https://discourse.julialang.org/t/ann-jump-dev-2025-videos/134442)

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**Author:** [@odow](https://discourse.julialang.org/u/odow)\
**Replies:** 0\
**Last updated:** [December 8, 2025, 7:50pm UTC](https://discourse.julialang.org/t/ann-jump-dev-2025-videos/134442 "2025-12-08T19:50:52Z")

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Dear all, The JuMP-dev 2025 videos are now on YouTube. Check them out here: https://www.youtube.com/playlist?list=PLP8iPy9hna6RLvzHeEVCwkUkZV3aChElQ Cheers, Oscar

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## [Is there an equivalent to Optim.jl's only\_fg! in Optimization.jl?](https://discourse.julialang.org/t/is-there-an-equivalent-to-optim-jls-only-fg-in-optimization-jl/134320)

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**Author:** [@anthony-meza](https://discourse.julialang.org/u/anthony-meza)\
**Replies:** 1\
**Last updated:** [December 8, 2025, 7:48pm UTC](https://discourse.julialang.org/t/is-there-an-equivalent-to-optim-jls-only-fg-in-optimization-jl/134320 "2025-12-08T19:48:54Z")

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Optim.jl implements an only\_fg! function that allows calculations made in the objective function, f, to be passed to the gradient, g. By constructing an fg! function, you can avoid redundant calculations that are require…

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## [Need help solving boundary value problem using SciML collocation, when I have unknown parameters in boundary conditions](https://discourse.julialang.org/t/need-help-solving-boundary-value-problem-using-sciml-collocation-when-i-have-unknown-parameters-in-boundary-conditions/134404)

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**Author:** [@ThermionicsGuy](https://discourse.julialang.org/u/ThermionicsGuy)\
**Replies:** 3\
**Last updated:** [December 8, 2025, 6:35pm UTC](https://discourse.julialang.org/t/need-help-solving-boundary-value-problem-using-sciml-collocation-when-i-have-unknown-parameters-in-boundary-conditions/134404 "2025-12-08T18:35:45Z")

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I have a nonlinear two-point boundary value problem consisting of five first-order differential equations. There are three boundary conditions at t=0 and two at t=1. Each boundary condition set also has one unknown param…

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## [Makie Axis xticks: passing (datetimes, labels) fails with MethodError](https://discourse.julialang.org/t/makie-axis-xticks-passing-datetimes-labels-fails-with-methoderror/134411)

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**Author:** [@lfenzo](https://discourse.julialang.org/u/lfenzo)\
**Replies:** 4\
**Last updated:** [December 8, 2025, 12:02pm UTC](https://discourse.julialang.org/t/makie-axis-xticks-passing-datetimes-labels-fails-with-methoderror/134411 "2025-12-08T12:02:26Z")

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Hello! I’m trying to change the DateTime xtick label intervals in my Makie plot by manually passing the xticks parameter to Axis as a tuple with two vectors: (datetimes, labels). According to the current xticks docs: T…

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## [Block/Tile-Based GPU Programming (not Scratch)](https://discourse.julialang.org/t/block-tile-based-gpu-programming-not-scratch/127731)

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**Author:** [@NonDairyNeutrino](https://discourse.julialang.org/u/NonDairyNeutrino)\
**Replies:** 3\
**Last updated:** [December 8, 2025, 5:20am UTC](https://discourse.julialang.org/t/block-tile-based-gpu-programming-not-scratch/127731 "2025-12-08T05:20:14Z")

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I just found that there’s this new (at least to me) GPU programming framework called “Block/Tile-Based”, whether it’s “block” or “tile” seems to depend on who you ask. The three I’ve just seen are OpenAI’s Triton, NVIDI…

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## [StackOverflowError when using PRIMA.jl on Ubuntu (works fine on macOS and Windows)](https://discourse.julialang.org/t/stackoverflowerror-when-using-prima-jl-on-ubuntu-works-fine-on-macos-and-windows/131012)

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**Author:** [@pclins](https://discourse.julialang.org/u/pclins)\
**Replies:** 5\
**Last updated:** [December 7, 2025, 3:29pm UTC](https://discourse.julialang.org/t/stackoverflowerror-when-using-prima-jl-on-ubuntu-works-fine-on-macos-and-windows/131012 "2025-12-07T15:29:12Z")

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Hi everyone, I’m running into a strange StackOverflowError when using Julia on Ubuntu. The same code runs without any issues on macOS and Windows. I’m using PRIMA.jl (via OptimizationPRIMA.jl) to optimize a function. M…

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## [How to extrapolate on non-uniform grid?](https://discourse.julialang.org/t/how-to-extrapolate-on-non-uniform-grid/134394)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 3\
**Last updated:** [December 7, 2025, 7:03am UTC](https://discourse.julialang.org/t/how-to-extrapolate-on-non-uniform-grid/134394 "2025-12-07T07:03:55Z")

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How to interpolate(actually extrapolate later) Bp values on r,θand ϕ grid? I have non-uniform grid of r,θand ϕ, where r is geometric series and θand ϕ have constant spacing. r = Float32\[1.677044, 1.8385518, 2.0156136, 2…

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## [Can ModelingToolkit be used with GPU arrays?](https://discourse.julialang.org/t/can-modelingtoolkit-be-used-with-gpu-arrays/134352)

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**Author:** [@pmc4](https://discourse.julialang.org/u/pmc4)\
**Replies:** 10\
**Last updated:** [December 6, 2025, 7:42pm UTC](https://discourse.julialang.org/t/can-modelingtoolkit-be-used-with-gpu-arrays/134352 "2025-12-06T19:42:39Z")

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Hello, everyone. I’m trying to solve a complex system using ModelingToolkit, which involves an array variable. One of the equations is quite heavy computationally and I was trying to pass this array as an argument, then …

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## [2 Y Axes in Algebra of Graphics](https://discourse.julialang.org/t/2-y-axes-in-algebra-of-graphics/68968)

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**Author:** [@junder873](https://discourse.julialang.org/u/junder873)\
**Replies:** 4\
**Last updated:** [December 6, 2025, 11:47am UTC](https://discourse.julialang.org/t/2-y-axes-in-algebra-of-graphics/68968 "2025-12-06T11:47:41Z")

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I have been trying to figure out how to make two separate y-axes for a plot in Algebra of Graphics. This seems possible in Makie, julia - Double y-axis on left and right side of plot in Makie.jl - Stack Overflow (though …

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## [NonlinearSolve.jl : mimic SimpleNewtonRaphson with NewtonRaphson](https://discourse.julialang.org/t/nonlinearsolve-jl-mimic-simplenewtonraphson-with-newtonraphson/134280)

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**Author:** [@bmxam](https://discourse.julialang.org/u/bmxam)\
**Replies:** 5\
**Last updated:** [December 5, 2025, 2:50pm UTC](https://discourse.julialang.org/t/nonlinearsolve-jl-mimic-simplenewtonraphson-with-newtonraphson/134280 "2025-12-05T14:50:57Z")

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Hi everyone, I’m trying to solve a non-linear equation using a Newton-Raphson method using NonlinearSolve.jl . I have my own implementation of a basic Newton-Raphson algorithm, and the SimpleNewtonRaphson algorithm does…

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## [Is \`callback\` really compatible with NonlinearProblem?](https://discourse.julialang.org/t/is-callback-really-compatible-with-nonlinearproblem/134332)

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**Author:** [@bmxam](https://discourse.julialang.org/u/bmxam)\
**Replies:** 4\
**Last updated:** [December 5, 2025, 12:07pm UTC](https://discourse.julialang.org/t/is-callback-really-compatible-with-nonlinearproblem/134332 "2025-12-05T12:07:45Z")

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Hi everyone, According to the documentation (Nonlinear Problems · NonlinearSolve.jl), “if you set a callback in the problem, then that callback will be added in every solve call”. So I tried to add a callback but nothin…

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## [Seeking faster method for finding top eigenvalues of large dense matrices](https://discourse.julialang.org/t/seeking-faster-method-for-finding-top-eigenvalues-of-large-dense-matrices/134231)

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**Author:** [@Udonge](https://discourse.julialang.org/u/Udonge)\
**Replies:** 18\
**Last updated:** [December 4, 2025, 1:49pm UTC](https://discourse.julialang.org/t/seeking-faster-method-for-finding-top-eigenvalues-of-large-dense-matrices/134231 "2025-12-04T13:49:11Z")

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Hello everyone, I am new to the Julia language, and I’ve encountered a performance issue with an eigenvalue computation. Please feel free to point out any confusing statements or beginner mistakes! I need to compute th…

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## [Running external c-code function in MTK model](https://discourse.julialang.org/t/running-external-c-code-function-in-mtk-model/134265)

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**Author:** [@JulianMs](https://discourse.julialang.org/u/JulianMs)\
**Replies:** 7\
**Last updated:** [December 4, 2025, 8:59am UTC](https://discourse.julialang.org/t/running-external-c-code-function-in-mtk-model/134265 "2025-12-04T08:59:08Z")

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Hi community, I am new to Julia and in particular MTK. My goal is to simulate a battery cell and couple it with external C-code to run an extended Kalman filter for SOC estimation at a fixed sampling rate. Somehow thi…

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## [Laplacian regularisation for GLMs](https://discourse.julialang.org/t/laplacian-regularisation-for-glms/134154)

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**Author:** [@grero](https://discourse.julialang.org/u/grero)\
**Replies:** 10\
**Last updated:** [December 4, 2025, 2:59am UTC](https://discourse.julialang.org/t/laplacian-regularisation-for-glms/134154 "2025-12-04T02:59:52Z")

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I would like to use GLM to approximate an integer variable as following a Poisson distribution where the rate parameter is determined by a the independent variable X. X lives in a non-Euclidean space, and so using vanill…

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