# Latest

**URL:** https://discourse.julialang.org/latest.md?page=116

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

**Page:** 117

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## [HDR pixels: tuples vs. StaticArrays](https://discourse.julialang.org/t/hdr-pixels-tuples-vs-staticarrays/131929)

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**Author:** [@rmfritz](https://discourse.julialang.org/u/rmfritz)\
**Replies:** 13\
**Last updated:** [August 29, 2025, 9:26pm UTC](https://discourse.julialang.org/t/hdr-pixels-tuples-vs-staticarrays/131929 "2025-08-29T21:26:09Z")

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I’m working with an HDR pixel type, which at the moment I am representing as a tuple. I can make a case for using an SVector or MVector instead, so I wobble back and forth between leaving the code as it is and switching …

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## [Adjacent elements of a Vertex in Meshes.jl](https://discourse.julialang.org/t/adjacent-elements-of-a-vertex-in-meshes-jl/131900)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 2\
**Last updated:** [August 29, 2025, 9:13pm UTC](https://discourse.julialang.org/t/adjacent-elements-of-a-vertex-in-meshes-jl/131900 "2025-08-29T21:13:37Z")

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How to get the adjacent elements of a vertex in Meshes.jl ? using Meshes, CoordRefSystems ,GLMakie r = Float32\[1.6, 1.754088, 1.9230156, 2.1082115, 2.311243, 2.5338273, 2.7778475, 3.0453684, 3.3386526, 3.6601818, 4.01…

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## [Using control flow in Reactant](https://discourse.julialang.org/t/using-control-flow-in-reactant/131946)

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**Author:** [@dameka](https://discourse.julialang.org/u/dameka)\
**Replies:** 4\
**Last updated:** [August 29, 2025, 6:20pm UTC](https://discourse.julialang.org/t/using-control-flow-in-reactant/131946 "2025-08-29T18:20:58Z")

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I’ve got some expensive code I’m running that I’d like to compile with Reactant. There is some control flow that’s not playing nice with Reactant. I’ve got an MWE producing a different error than my main code, but I’m ho…

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## [I want Best Practices for Working With Python & Julia Together](https://discourse.julialang.org/t/i-want-best-practices-for-working-with-python-julia-together/131700)

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**Author:** [@Olivia](https://discourse.julialang.org/u/Olivia)\
**Replies:** 16\
**Last updated:** [August 29, 2025, 5:58pm UTC](https://discourse.julialang.org/t/i-want-best-practices-for-working-with-python-julia-together/131700 "2025-08-29T17:58:04Z")

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Hi everyone, I am enjoying how fast & expressive it feels compared to some other languages I have used before. I still rely a lot on Python for certain libraries & workflows. I have been exploring ways to combine the t…

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## [Lessons learnt and thoughts on deploying Julia and sysimages on AWS](https://discourse.julialang.org/t/lessons-learnt-and-thoughts-on-deploying-julia-and-sysimages-on-aws/130669)

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**Author:** [@ConnectedSystems](https://discourse.julialang.org/u/ConnectedSystems)\
**Replies:** 1\
**Last updated:** [August 29, 2025, 1:57pm UTC](https://discourse.julialang.org/t/lessons-learnt-and-thoughts-on-deploying-julia-and-sysimages-on-aws/130669 "2025-08-29T13:57:17Z")

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I have spent a portion of my time on and off over the past two weeks trying to build docker containers with sysimages to deploy on AWS. Over that time I have run into various issues and thought it worthwhile writing up m…

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## [Viewer for VS Code (Notebook Alternative)](https://discourse.julialang.org/t/viewer-for-vs-code-notebook-alternative/131878)

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**Author:** [@Alex1](https://discourse.julialang.org/u/Alex1)\
**Replies:** 4\
**Last updated:** [August 29, 2025, 1:34pm UTC](https://discourse.julialang.org/t/viewer-for-vs-code-notebook-alternative/131878 "2025-08-29T13:34:44Z")

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When julia used with multiple files and VS Code. What are options to render plots, doc, formulas? Basically just some sort of renderer like Notebook Viewer? For many years and currently I use my own reporting - basical…

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## [Loading a library which depends on another library](https://discourse.julialang.org/t/loading-a-library-which-depends-on-another-library/131922)

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**Author:** [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)\
**Replies:** 2\
**Last updated:** [August 29, 2025, 12:23pm UTC](https://discourse.julialang.org/t/loading-a-library-which-depends-on-another-library/131922 "2025-08-29T12:23:09Z")

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I have a project that is a mixture between Julia and Lean. The Lean part builds a dynamic library at .lake/build/lib/libPlaceholder.{dylib,so}, which in turn depends on the system Lean installation at ~/.elan/toolchains/…

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## [Optimization Based Kalman Filters](https://discourse.julialang.org/t/optimization-based-kalman-filters/131937)

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**Author:** [@langestefan](https://discourse.julialang.org/u/langestefan)\
**Replies:** 6\
**Last updated:** [August 29, 2025, 12:19pm UTC](https://discourse.julialang.org/t/optimization-based-kalman-filters/131937 "2025-08-29T12:19:03Z")

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I was wondering if we have any reference implementations or packages that implement (convex) optimization based kalman filters. Such as discussed in this paper by Boyd: Real-Time Convex Optimization in Signal Processing …

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## [Is it possible to define '+' operator for string as '\*' do for them?](https://discourse.julialang.org/t/is-it-possible-to-define-operator-for-string-as-do-for-them/131835)

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**Author:** [@psalm1750](https://discourse.julialang.org/u/psalm1750)\
**Replies:** 12\
**Last updated:** [August 26, 2025, 1:29pm UTC](https://discourse.julialang.org/t/is-it-possible-to-define-operator-for-string-as-do-for-them/131835 "2025-08-26T13:29:30Z")

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I’d like to use ‘+’ operator for string concatenation. but it is ‘\*’ in Julia. If possible I’d like to define ‘+’ as alias of ‘\*’ if opland are strings. because some insufficient definition cause some side effect. Th…

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## [Large execution time jumps](https://discourse.julialang.org/t/large-execution-time-jumps/131924)

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**Author:** [@harri37](https://discourse.julialang.org/u/harri37)\
**Replies:** 2\
**Last updated:** [August 29, 2025, 9:26am UTC](https://discourse.julialang.org/t/large-execution-time-jumps/131924 "2025-08-29T09:26:36Z")

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Hello everyone, I am working on building a computer algebra library in Julia and have encountered some strange behavior in how the execution time increases when I multiply polynomials. Essentially the code will execute…

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## [\[ANN\] Introducing LLMAccess: A Simple Julia Wrapper for LLM REST APIs](https://discourse.julialang.org/t/ann-introducing-llmaccess-a-simple-julia-wrapper-for-llm-rest-apis/123664)

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**Author:** [@Xing\_Shi\_Cai](https://discourse.julialang.org/u/Xing_Shi_Cai)\
**Replies:** 6\
**Last updated:** [August 29, 2025, 9:20am UTC](https://discourse.julialang.org/t/ann-introducing-llmaccess-a-simple-julia-wrapper-for-llm-rest-apis/123664 "2025-08-29T09:20:21Z")

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I would like to share a little project I’ve been working on called LLMAccess. It’s a simple Julia package designed to simplify interactions with various Large Language Model (LLM) APIs by wrapping around their existing R…

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## [Lost in documentation deployment on Github](https://discourse.julialang.org/t/lost-in-documentation-deployment-on-github/131668)

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**Author:** [@nicolas](https://discourse.julialang.org/u/nicolas)\
**Replies:** 3\
**Last updated:** [August 29, 2025, 7:29am UTC](https://discourse.julialang.org/t/lost-in-documentation-deployment-on-github/131668 "2025-08-29T07:29:18Z")

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In 2021, I created the package GitHub - NicolasL-S/SpeedMapping.jl: General fixed point mapping acceleration and optimization in Julia I finally got some time to update it. I created a branch “MajorRefactor” to make all…

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## [Restart an existing MCMC chain at the same point it was paused](https://discourse.julialang.org/t/restart-an-existing-mcmc-chain-at-the-same-point-it-was-paused/131901)

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**Author:** [@ghadgeabhi](https://discourse.julialang.org/u/ghadgeabhi)\
**Replies:** 2\
**Last updated:** [August 29, 2025, 5:44am UTC](https://discourse.julialang.org/t/restart-an-existing-mcmc-chain-at-the-same-point-it-was-paused/131901 "2025-08-29T05:44:12Z")

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In my workflow, I want to be able look at the metrics of a MCMC chain, so I want run it for a certain amount of iteration. I want to then be able to continue the same chain for more iterations. How could this be done wi…

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## [Adding rows to data frame](https://discourse.julialang.org/t/adding-rows-to-data-frame/131925)

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**Author:** [@SergeantMike](https://discourse.julialang.org/u/SergeantMike)\
**Replies:** 2\
**Last updated:** [August 29, 2025, 1:37am UTC](https://discourse.julialang.org/t/adding-rows-to-data-frame/131925 "2025-08-29T01:37:47Z")

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I have a dataset that looks like this: Elapsed Days Insects Collected on that day 1 0 2 3 4 25 5 21 6 14 8 2 and I have a second dataset that is similar but is missing different days Elapsed Da…

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## [Using Reactant with Lux and Enzyme to speed up training in physics context](https://discourse.julialang.org/t/using-reactant-with-lux-and-enzyme-to-speed-up-training-in-physics-context/131898)

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**Author:** [@dameka](https://discourse.julialang.org/u/dameka)\
**Replies:** 16\
**Last updated:** [August 28, 2025, 8:56pm UTC](https://discourse.julialang.org/t/using-reactant-with-lux-and-enzyme-to-speed-up-training-in-physics-context/131898 "2025-08-28T20:56:28Z")

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I am training a neural network in a physical context on observables; crucially, the network is producing values which are passed through some physics calculations before being compared to the training data. My code works…

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## [Financing Projects of Value to the Community](https://discourse.julialang.org/t/financing-projects-of-value-to-the-community/131857)

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**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 4\
**Last updated:** [August 28, 2025, 8:14pm UTC](https://discourse.julialang.org/t/financing-projects-of-value-to-the-community/131857 "2025-08-28T20:14:14Z")

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A recent post caught my attention. TBH, I was disappointed that the BonitoBook was even being considered, not because I don’t like the product, but because the developers have done such an excellent job in the plotting …

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## [What is the partial order used for multiple dispatch?](https://discourse.julialang.org/t/what-is-the-partial-order-used-for-multiple-dispatch/131911)

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**Author:** [@rveltz](https://discourse.julialang.org/u/rveltz)\
**Replies:** 5\
**Last updated:** [August 28, 2025, 8:14pm UTC](https://discourse.julialang.org/t/what-is-the-partial-order-used-for-multiple-dispatch/131911 "2025-08-28T20:14:35Z")

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In the docs, one can find that a paragraph on multiple dispatch but the dispatching algorithm is not described. My question is: given two tuples args1, args2 of arguments (or types), what is the partial order \< which is…

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## [Cursed Custom Infix Operators](https://discourse.julialang.org/t/cursed-custom-infix-operators/131915)

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**Author:** [@mrufsvold](https://discourse.julialang.org/u/mrufsvold)\
**Replies:** 2\
**Last updated:** [August 28, 2025, 4:44pm UTC](https://discourse.julialang.org/t/cursed-custom-infix-operators/131915 "2025-08-28T16:44:32Z")

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Reading this StackExchange page on custom infix operators got me thinking about Julia’s special casing for infix operators and if there was any way to get that kind of expressiveness. Regular macros won’t work since you …

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## [Which files to backup in .julia?](https://discourse.julialang.org/t/which-files-to-backup-in-julia/131906)

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**Author:** [@hadrien.theveneau](https://discourse.julialang.org/u/hadrien.theveneau)\
**Replies:** 6\
**Last updated:** [August 28, 2025, 4:00pm UTC](https://discourse.julialang.org/t/which-files-to-backup-in-julia/131906 "2025-08-28T16:00:36Z")

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Hi everyone, I regularly backup my WSL2 home directory, and I realized that the .julia folder is rather big. Is there any parts of this folder which I can skip ? Many thanks, Have a nice day, P.S: Here the folder siz…

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## [CPLEX Root node processing (before b&c) CPU Time extremely higher than JuMP Time Limit](https://discourse.julialang.org/t/cplex-root-node-processing-before-b-c-cpu-time-extremely-higher-than-jump-time-limit/109920)

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**Author:** [@K5Julien](https://discourse.julialang.org/u/K5Julien)\
**Replies:** 2\
**Last updated:** [August 28, 2025, 3:57pm UTC](https://discourse.julialang.org/t/cplex-root-node-processing-before-b-c-cpu-time-extremely-higher-than-jump-time-limit/109920 "2025-08-28T15:57:00Z")

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I have recently switched from Gurobi to CPLEX and am very surprised I found several instances where all ticks and CPU time is spent at Root node processing and more disconcerting the total time (before B&C and root node)…

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## [Formatting difference between VS Code and JuliaFormatter](https://discourse.julialang.org/t/formatting-difference-between-vs-code-and-juliaformatter/131910)

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**Author:** [@hildebrandecon](https://discourse.julialang.org/u/hildebrandecon)\
**Replies:** 1\
**Last updated:** [August 28, 2025, 2:31pm UTC](https://discourse.julialang.org/t/formatting-difference-between-vs-code-and-juliaformatter/131910 "2025-08-28T14:31:39Z")

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Hi, I noticed that when using JuliaFormatter v2.1.6 with VS Code and a local project environment (Project.toml), there is a difference in how spaces are handled in indexing expressions, even without a .JuliaFormatter.to…

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## [Slow compilation with SecondOrderODEProblem](https://discourse.julialang.org/t/slow-compilation-with-secondorderodeproblem/131749)

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**Author:** [@sijo](https://discourse.julialang.org/u/sijo)\
**Replies:** 3\
**Last updated:** [August 28, 2025, 1:55pm UTC](https://discourse.julialang.org/t/slow-compilation-with-secondorderodeproblem/131749 "2025-08-28T13:55:37Z")

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Is the following expected? (DifferentialEquations 7.16 in Julia 1.11.6) using DifferentialEquations function OneDimSpring2!(ddu, du, u, p, t) ddu\[1\] = 1.0 + 1.0/u\[1\]^2 end du0 = \[0.0\] u0 = \[2.0\] tspan = (0.0, 50.0…

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## [Customized xticklabels with GeoMakie?](https://discourse.julialang.org/t/customized-xticklabels-with-geomakie/131886)

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**Author:** [@sablonl](https://discourse.julialang.org/u/sablonl)\
**Replies:** 2\
**Last updated:** [August 28, 2025, 1:23pm UTC](https://discourse.julialang.org/t/customized-xticklabels-with-geomakie/131886 "2025-08-28T13:23:29Z")

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I’d like to plot some maps using GeoMakie.jl, but I would like to modify the default xticks. I tried several approaches : via a formatter xtickformat or via manually annotating the figure. None of those works… The attri…

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## [Simple diagrams in docs](https://discourse.julialang.org/t/simple-diagrams-in-docs/131884)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 7\
**Last updated:** [August 28, 2025, 11:32am UTC](https://discourse.julialang.org/t/simple-diagrams-in-docs/131884 "2025-08-28T11:32:47Z")

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I would like to include a simple diagram (= boxes connected by arrows) in the docs of a Julia package, generated by Documenter.jl as usual. I am not sure what my best option is. I can just write it in whatever markup I…

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## [Will my variable be modified in a \`do\` block? Very subtle to anticipate](https://discourse.julialang.org/t/will-my-variable-be-modified-in-a-do-block-very-subtle-to-anticipate/131124)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 13\
**Last updated:** [July 28, 2025, 11:28am UTC](https://discourse.julialang.org/t/will-my-variable-be-modified-in-a-do-block-very-subtle-to-anticipate/131124 "2025-07-28T11:28:09Z")

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I notice this difference julia\> Threads.nthreads() 4 julia\> my\_lock = Threads.ReentrantLock() ReentrantLock(nothing, 0x00000000, 0x00, Base.GenericCondition{Base.Threads.SpinLock}(Base.IntrusiveLinkedList{Task}(nothing…

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## [Parameter estimation in mathematical models of common functions (sine, cos, exp and other special functions)](https://discourse.julialang.org/t/parameter-estimation-in-mathematical-models-of-common-functions-sine-cos-exp-and-other-special-functions/130325)

<div class="topic-metadata">

**Author:** [@Geegee](https://discourse.julialang.org/u/Geegee)\
**Replies:** 15\
**Last updated:** [August 28, 2025, 10:25am UTC](https://discourse.julialang.org/t/parameter-estimation-in-mathematical-models-of-common-functions-sine-cos-exp-and-other-special-functions/130325 "2025-08-28T10:25:44Z")

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Hello all glad to have arrived here. I have recently picked up Julia, but am quite excited about it! I have many data sets that follow the same model but the parameters change widely from dataset to dataset. In our la…

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## [Can you find where this asynchronous program get stuck at?](https://discourse.julialang.org/t/can-you-find-where-this-asynchronous-program-get-stuck-at/131907)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 2\
**Last updated:** [August 28, 2025, 9:45am UTC](https://discourse.julialang.org/t/can-you-find-where-this-asynchronous-program-get-stuck-at/131907 "2025-08-28T09:45:13Z")

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I wrote a weird test function function test() function taskbody(k, x, j, e) sleep(0.5 \* j) println("At k = $k, j = $j, x = $x") @lock mylock i+=1 notify(e) end my\_lock = Threa…

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## [Performance of \`exp(A)\` for 9x9 anti-Hermitian matrix: Julia vs. PyTorch vs. MATLAB (CPU & GPU)](https://discourse.julialang.org/t/performance-of-exp-a-for-9x9-anti-hermitian-matrix-julia-vs-pytorch-vs-matlab-cpu-gpu/131696)

<div class="topic-metadata">

**Author:** [@draftman9](https://discourse.julialang.org/u/draftman9)\
**Replies:** 29\
**Last updated:** [August 28, 2025, 2:25am UTC](https://discourse.julialang.org/t/performance-of-exp-a-for-9x9-anti-hermitian-matrix-julia-vs-pytorch-vs-matlab-cpu-gpu/131696 "2025-08-28T02:25:07Z")

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Hi everyone, I’m a Ph.D. student in physics. A core part of my research involves simulating the time evolution of quantum systems, which boils down to frequently calculating the matrix exponential U = exp(A). For these…

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## [Poll: What do you use: Distributed or MPI?](https://discourse.julialang.org/t/poll-what-do-you-use-distributed-or-mpi/131741)

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**Author:** [@linwaytin](https://discourse.julialang.org/u/linwaytin)\
**Replies:** 14\
**Last updated:** [August 27, 2025, 10:57pm UTC](https://discourse.julialang.org/t/poll-what-do-you-use-distributed-or-mpi/131741 "2025-08-27T22:57:51Z")

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Julia’s default multi-processing system, Distributed, is based on a different paradigm than the de facto standard MPI in HPC. I’m really wondering the numbers of people using the two different types of distributed compu…

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## [Mapping over multidimensional array with eachslice](https://discourse.julialang.org/t/mapping-over-multidimensional-array-with-eachslice/131880)

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**Author:** [@Geegee](https://discourse.julialang.org/u/Geegee)\
**Replies:** 5\
**Last updated:** [August 27, 2025, 4:55pm UTC](https://discourse.julialang.org/t/mapping-over-multidimensional-array-with-eachslice/131880 "2025-08-27T16:55:10Z")

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I have a data opject Array{Float64, 3} where I want to map 2nd and 3rd dimension a function that accepts some static arguments and takes a Vector{Float64} from the data object. I tried to do this with eachslice(data, …

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