# Latest

**URL:** https://discourse.julialang.org/latest.md?page=90

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

**Page:** 91

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## [Issue: PDMats.jl matrices losing positive-definiteness with Optim.jl autodiff](https://discourse.julialang.org/t/issue-pdmats-jl-matrices-losing-positive-definiteness-with-optim-jl-autodiff/133421)

<div class="topic-metadata">

**Author:** [@fibrebundl](https://discourse.julialang.org/u/fibrebundl)\
**Replies:** 19\
**Last updated:** [October 29, 2025, 4:13pm UTC](https://discourse.julialang.org/t/issue-pdmats-jl-matrices-losing-positive-definiteness-with-optim-jl-autodiff/133421 "2025-10-29T16:13:12Z")

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I’m optimizing a covariance recovery problem and want to use PDMats.jl to ensure positive-definiteness. However, when using Optim.jl’s autodiff, the matrices created with PDMats aren’t maintaining their PD characteristic…

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## [Pointers in Julia documentation](https://discourse.julialang.org/t/pointers-in-julia-documentation/119571)

<div class="topic-metadata">

**Author:** [@martin\_sanchez](https://discourse.julialang.org/u/martin_sanchez)\
**Replies:** 12\
**Last updated:** [October 29, 2025, 3:23pm UTC](https://discourse.julialang.org/t/pointers-in-julia-documentation/119571 "2025-10-29T15:23:58Z")

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Hi, I was trying to implement some algorithms and data structures such as linked list, for which I need pointers. I wanted to know why is the use of pointers so obscured. I have not really found any formal explanation of…

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## [\[ANN\] EvoTrees.jl v0.18 release](https://discourse.julialang.org/t/ann-evotrees-jl-v0-18-release/133446)

<div class="topic-metadata">

**Author:** [@jeremiedb](https://discourse.julialang.org/u/jeremiedb)\
**Replies:** 6\
**Last updated:** [October 29, 2025, 3:20pm UTC](https://discourse.julialang.org/t/ann-evotrees-jl-v0-18-release/133446 "2025-10-29T15:20:39Z")

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This work behind the latest EvoTrees.jl release was mainly from SciML’s small grant project to improve GPU performance: Improve training performance of GPU backend Project Extension by AdityaPandeyCN · Pull Request #174 …

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## [Documenter build fails on CI with "OpenSSL\_jll … not installed" error](https://discourse.julialang.org/t/documenter-build-fails-on-ci-with-openssl-jll-not-installed-error/133505)

<div class="topic-metadata">

**Author:** [@Xing\_Shi\_Cai](https://discourse.julialang.org/u/Xing_Shi_Cai)\
**Replies:** 1\
**Last updated:** [October 29, 2025, 12:21pm UTC](https://discourse.julialang.org/t/documenter-build-fails-on-ci-with-openssl-jll-not-installed-error/133505 "2025-10-29T12:21:12Z")

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Hi all — '’m hitting a puzzling failure building docs on Julia 1.12 where stdlib JLLs fail to load during precompilation. It happens in GitLab CI. Here’s the error julia --project=docs -e 'using Pkg; Pkg.develop(Packa…

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## [How to use sklearn in julia](https://discourse.julialang.org/t/how-to-use-sklearn-in-julia/133493)

<div class="topic-metadata">

**Author:** [@Monicate](https://discourse.julialang.org/u/Monicate)\
**Replies:** 3\
**Last updated:** [October 29, 2025, 9:28am UTC](https://discourse.julialang.org/t/how-to-use-sklearn-in-julia/133493 "2025-10-29T09:28:30Z")

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Hello, when installing a package I got the error: The Python package sklearn could not be imported by pyimport. Usually this means that you did not install sklearn in the Python version being used by PyCall. So I inst…

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## ["comprehension" seems like an awkward word choice](https://discourse.julialang.org/t/comprehension-seems-like-an-awkward-word-choice/132781)

<div class="topic-metadata">

**Author:** [@Tigerbyte](https://discourse.julialang.org/u/Tigerbyte)\
**Replies:** 16\
**Last updated:** [October 29, 2025, 8:43am UTC](https://discourse.julialang.org/t/comprehension-seems-like-an-awkward-word-choice/132781 "2025-10-29T08:43:43Z")

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In Julia, an item like: \[ xx for x in 1:5 \] is called a “comprehension” and results in a Vector as in: julia\> \[xx for x in 1:5\] 5-element Vector{Int64}: 1 4 9 16 25 Not even sure what the word “comprehension” …

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## [ERROR: LoadError: ArgumentError: Package FixConda does not have Pkg in its dependencies](https://discourse.julialang.org/t/error-loaderror-argumenterror-package-fixconda-does-not-have-pkg-in-its-dependencies/133457)

<div class="topic-metadata">

**Author:** [@Monicate](https://discourse.julialang.org/u/Monicate)\
**Replies:** 4\
**Last updated:** [October 29, 2025, 7:37am UTC](https://discourse.julialang.org/t/error-loaderror-argumenterror-package-fixconda-does-not-have-pkg-in-its-dependencies/133457 "2025-10-29T07:37:22Z")

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Hello, I’m trying to install a package using Pkg.add(PackageSpec(url="https://bitbucket.org/etjekant/fixconda/src/master/")) Which yields the following error: ERROR: LoadError: ArgumentError: Package FixConda does not…

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## [How to use LocalRegistry in my package registered in GeneralRegistry](https://discourse.julialang.org/t/how-to-use-localregistry-in-my-package-registered-in-generalregistry/133494)

<div class="topic-metadata">

**Author:** [@AdamWysokinski](https://discourse.julialang.org/u/AdamWysokinski)\
**Replies:** 4\
**Last updated:** [October 29, 2025, 6:52am UTC](https://discourse.julialang.org/t/how-to-use-localregistry-in-my-package-registered-in-generalregistry/133494 "2025-10-29T06:52:16Z")

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Hi, I’ve created a LocalRegistry (LR) and added two packages to it (AdamWysokinski/NeuroAnalyzer\_registry: Packages required for NeuroAnalyzer - Codeberg.org). One package is not in the GeneralRegistry (GR) and another …

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## [ERROR: Method overwriting is not permitted during Module precompilation](https://discourse.julialang.org/t/error-method-overwriting-is-not-permitted-during-module-precompilation/133482)

<div class="topic-metadata">

**Author:** [@Monicate](https://discourse.julialang.org/u/Monicate)\
**Replies:** 2\
**Last updated:** [October 28, 2025, 10:01pm UTC](https://discourse.julialang.org/t/error-method-overwriting-is-not-permitted-during-module-precompilation/133482 "2025-10-28T22:01:19Z")

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I’m trying to install a number of packages ( Denice\_van\_Herwerden / jhrmstoolbox.jl — Bitbucket) but I get ERROR: Method overwriting is not permitted during Module precompilation. Use \_\_precompile\_\_(false) to opt-out of…

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## [Julia significantly slower than Matlab for simple sin(x) loop – am I doing something wrong?](https://discourse.julialang.org/t/julia-significantly-slower-than-matlab-for-simple-sin-x-loop-am-i-doing-something-wrong/133317)

<div class="topic-metadata">

**Author:** [@GateOfShadows](https://discourse.julialang.org/u/GateOfShadows)\
**Replies:** 8\
**Last updated:** [October 28, 2025, 10:00pm UTC](https://discourse.julialang.org/t/julia-significantly-slower-than-matlab-for-simple-sin-x-loop-am-i-doing-something-wrong/133317 "2025-10-28T22:00:46Z")

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Hi everyone, I recently did some benchmark testing between Julia and Matlab, focusing on basic for-loops and vectorized numerical operations. To my surprise, Julia performed significantly worse than Matlab in some very …

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## [Multi agent orchestration for Julia code generation: Best tooling / practices?](https://discourse.julialang.org/t/multi-agent-orchestration-for-julia-code-generation-best-tooling-practices/133488)

<div class="topic-metadata">

**Author:** [@Bill\_Holmes](https://discourse.julialang.org/u/Bill_Holmes)\
**Replies:** 1\
**Last updated:** [October 28, 2025, 8:53pm UTC](https://discourse.julialang.org/t/multi-agent-orchestration-for-julia-code-generation-best-tooling-practices/133488 "2025-10-28T20:53:39Z")

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Hello all, I’m hoping to crowd source some information on best tooling and practices for multi-agent orchestration for production of Julia code. I am starting to get on the bandwagon of offloading relatively straitforwa…

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## [ModelingToolkit Symbolics maxiters not enough](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463)

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**Author:** [@AlirezaMiraliakbar](https://discourse.julialang.org/u/AlirezaMiraliakbar)\
**Replies:** 2\
**Last updated:** [October 28, 2025, 7:08pm UTC](https://discourse.julialang.org/t/modelingtoolkit-symbolics-maxiters-not-enough/133463 "2025-10-28T19:08:48Z")

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Hi, I am trying to model a chemical process with modeling toolkit and I have set 4 of my variables to irreducible = true. However, with doing this, I get the warning message from Symbolics that: Warning: Did not converg…

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## [Generate Package and Test](https://discourse.julialang.org/t/generate-package-and-test/133475)

<div class="topic-metadata">

**Author:** [@tduretz](https://discourse.julialang.org/u/tduretz)\
**Replies:** 4\
**Last updated:** [October 28, 2025, 5:24pm UTC](https://discourse.julialang.org/t/generate-package-and-test/133475 "2025-10-28T17:24:06Z")

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In have a question about package generation. Why does generate not also automatically generate the test folder as well as the necessary Project.toml and empty runtests.jl file ? I find it sometimes not trivial to add a …

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## [Using legacy C code with autodifferentiation](https://discourse.julialang.org/t/using-legacy-c-code-with-autodifferentiation/132548)

<div class="topic-metadata">

**Author:** [@marcobonici](https://discourse.julialang.org/u/marcobonici)\
**Replies:** 4\
**Last updated:** [October 28, 2025, 4:31pm UTC](https://discourse.julialang.org/t/using-legacy-c-code-with-autodifferentiation/132548 "2025-10-28T16:31:56Z")

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Hello, I am asking for some general guidance on the following task, There is a legacy code, written in C, that I would like to use directly in Julia. Ideally, I would like to be able to differentiate it as well (the co…

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## [JuliaCon Proceedings 2025](https://discourse.julialang.org/t/juliacon-proceedings-2025/133489)

<div class="topic-metadata">

**Author:** [@luraess](https://discourse.julialang.org/u/luraess)\
**Replies:** 0\
**Last updated:** [October 28, 2025, 4:31pm UTC](https://discourse.julialang.org/t/juliacon-proceedings-2025/133489 "2025-10-28T16:31:45Z")

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The Editorial Board of the Proceedings of the JuliaCon Conferences is excited to announce that submissions for 2025 contributions are open. We are currently accepting submissions for work presented at JuliaCon Global Pi…

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## [Automatic symbolic function barrier generation](https://discourse.julialang.org/t/automatic-symbolic-function-barrier-generation/133487)

<div class="topic-metadata">

**Author:** [@sablonl](https://discourse.julialang.org/u/sablonl)\
**Replies:** 0\
**Last updated:** [October 28, 2025, 4:00pm UTC](https://discourse.julialang.org/t/automatic-symbolic-function-barrier-generation/133487 "2025-10-28T16:00:10Z")

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Hi, I’m working with ModelingToolkit.jl and I have an issue with complex symbolic expressions, on which mtkcompile takes a lot of time. I discovered that I can hide expressions behind a function barrier using @register…

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## [VS CODE not launching SVG Picture](https://discourse.julialang.org/t/vs-code-not-launching-svg-picture/133477)

<div class="topic-metadata">

**Author:** [@Jason\_Palmer](https://discourse.julialang.org/u/Jason_Palmer)\
**Replies:** 7\
**Last updated:** [October 28, 2025, 3:29pm UTC](https://discourse.julialang.org/t/vs-code-not-launching-svg-picture/133477 "2025-10-28T15:29:04Z")

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I managed to install VS Code and the julia extension and am working through “think julia how to think like a computer scientist” am on page 36 where the turtle draws a line but when i execute the code no SVG page comes u…

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## [How does \`Base.@locals\` work?](https://discourse.julialang.org/t/how-does-base-locals-work/133483)

<div class="topic-metadata">

**Author:** [@mhauru](https://discourse.julialang.org/u/mhauru)\
**Replies:** 1\
**Last updated:** [October 28, 2025, 3:25pm UTC](https://discourse.julialang.org/t/how-does-base-locals-work/133483 "2025-10-28T15:25:08Z")

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Base.@locals has this very curious implementation: macro locals() return Expr(:locals) end How does this work? Is locals some sort of special node type in the AST? I can’t find it documented. I don’t need to know …

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## [ANN: OSMGeocoder.jl](https://discourse.julialang.org/t/ann-osmgeocoder-jl/133478)

<div class="topic-metadata">

**Author:** [@joshday](https://discourse.julialang.org/u/joshday)\
**Replies:** 0\
**Last updated:** [October 28, 2025, 1:51pm UTC](https://discourse.julialang.org/t/ann-osmgeocoder-jl/133478 "2025-10-28T13:51:33Z")

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Announcing OSMGeocoder.jl! This package enables geocoding through OpenStreetMap’s Nominatim API. Searches are cached in a SQLite database stored in your scratch space. It is already available in the general registry. …

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## [Build failure for 1.12.1 on Debian unstable](https://discourse.julialang.org/t/build-failure-for-1-12-1-on-debian-unstable/133468)

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**Author:** [@Dylan\_Thurston](https://discourse.julialang.org/u/Dylan_Thurston)\
**Replies:** 4\
**Last updated:** [October 28, 2025, 1:24pm UTC](https://discourse.julialang.org/t/build-failure-for-1-12-1-on-debian-unstable/133468 "2025-10-28T13:24:09Z")

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Building Julia 1.12.1 from source on Debian unstable I get a build failure while compiling the embedded LLVM, with a complaint that uint32\_t is not defined. This is obviously an issue with failure to include standard hea…

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## [Typst and other alternatives to LaTeX](https://discourse.julialang.org/t/typst-and-other-alternatives-to-latex/121652)

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**Author:** [@kevbonham](https://discourse.julialang.org/u/kevbonham)\
**Replies:** 203\
**Last updated:** [October 28, 2025, 1:02pm UTC](https://discourse.julialang.org/t/typst-and-other-alternatives-to-latex/121652 "2025-10-28T13:02:33Z")

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Why not typst? See also Home · Typstry.jl (Sorry, I’ll see myself out :face\_with\_peeking\_eye:)

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## [GUI library, feedback wanted](https://discourse.julialang.org/t/gui-library-feedback-wanted/131699)

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**Author:** [@ErikBuer](https://discourse.julialang.org/u/ErikBuer)\
**Replies:** 8\
**Last updated:** [October 28, 2025, 12:58pm UTC](https://discourse.julialang.org/t/gui-library-feedback-wanted/131699 "2025-10-28T12:58:01Z")

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Hi everyone. For the last couple of months, I’ve been working on a GUI library in Julia, using OpenGL. The goal is to simplify the development of engineering and scientific applications. Aside from shaders, the whole p…

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## [Mooncake + GPU?](https://discourse.julialang.org/t/mooncake-gpu/133472)

<div class="topic-metadata">

**Author:** [@dubosipsl](https://discourse.julialang.org/u/dubosipsl)\
**Replies:** 1\
**Last updated:** [October 28, 2025, 11:50am UTC](https://discourse.julialang.org/t/mooncake-gpu/133472 "2025-10-28T11:50:23Z")

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Hello all, I would like to know what to expect regarding using Mooncake for reverse AD on GPUs, preferably via KernelAbstractions. I see there is a CUDA extension handling CuArrays. What works now, and what could work i…

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## [Molly.jl - Shear Viscosity Notebook - Questions](https://discourse.julialang.org/t/molly-jl-shear-viscosity-notebook-questions/133466)

<div class="topic-metadata">

**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 2\
**Last updated:** [October 28, 2025, 11:35am UTC](https://discourse.julialang.org/t/molly-jl-shear-viscosity-notebook-questions/133466 "2025-10-28T11:35:09Z")

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This post concerns the tutorial at SINEQ Shear Viscosity. Q1: To what extend is the result obtained for the shear viscosity independent of the number of particles in the simulation? Q2: What happens in case that the nu…

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## [Improving performance of CUDA GPU kernel: LU factorization](https://discourse.julialang.org/t/improving-performance-of-cuda-gpu-kernel-lu-factorization/132971)

<div class="topic-metadata">

**Author:** [@Leo\_I](https://discourse.julialang.org/u/Leo_I)\
**Replies:** 17\
**Last updated:** [October 28, 2025, 10:37am UTC](https://discourse.julialang.org/t/improving-performance-of-cuda-gpu-kernel-lu-factorization/132971 "2025-10-28T10:37:38Z")

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I am learning GPU programming via CUDA.jl. I wish to implement an efficient LU factorization for matrices over a finite field (I implemented it as UInt8/UInt16/... with operations + mod and \* mod). For the sake of simpl…

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## [Error -146059294 in \`Base.cp\` when trying to copy large files](https://discourse.julialang.org/t/error-146059294-in-base-cp-when-trying-to-copy-large-files/132654)

<div class="topic-metadata">

**Author:** [@JosephPollacco](https://discourse.julialang.org/u/JosephPollacco)\
**Replies:** 9\
**Last updated:** [October 28, 2025, 8:43am UTC](https://discourse.julialang.org/t/error-146059294-in-base-cp-when-trying-to-copy-large-files/132654 "2025-10-28T08:43:33Z")

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Dear Julia community, I am having same problem that Base.cp fails for large file: I am using the latest version of Julia. Thanks, Joseph IOError: sendfile: Unknown system error -146059294 (Unknown system error -1460…

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## [These stack traces are still out of control](https://discourse.julialang.org/t/these-stack-traces-are-still-out-of-control/133447)

<div class="topic-metadata">

**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 5\
**Last updated:** [October 28, 2025, 7:28am UTC](https://discourse.julialang.org/t/these-stack-traces-are-still-out-of-control/133447 "2025-10-28T07:28:19Z")

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5 years ago, @Samuel\_Ainsworth posted These stack traces are out of control - General Usage - Julia Programming Language, and it’s still very much the case in the SciML ecosystem. I find it hard to believe that all t…

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## [Help replacing \`LScene\` by \`Axis3\`](https://discourse.julialang.org/t/help-replacing-lscene-by-axis3/133467)

<div class="topic-metadata">

**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 1\
**Last updated:** [October 27, 2025, 7:32pm UTC](https://discourse.julialang.org/t/help-replacing-lscene-by-axis3/133467 "2025-10-27T19:32:23Z")

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Consider a 100x100x50 grid in LScene: This is how it looks in Axis3(viewmode=:free, aspect=:data): It is somewhat “squeezed” compared to the previous visualization. Is there a way to reproduce the same perspecti…

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## [Postdoc offer: graph algorithms on GPU with Julia](https://discourse.julialang.org/t/postdoc-offer-graph-algorithms-on-gpu-with-julia/133465)

<div class="topic-metadata">

**Author:** [@gdalle](https://discourse.julialang.org/u/gdalle)\
**Replies:** 0\
**Last updated:** [October 27, 2025, 5:34pm UTC](https://discourse.julialang.org/t/postdoc-offer-graph-algorithms-on-gpu-with-julia/133465 "2025-10-27T17:34:59Z")

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Hi all :waving\_hand: I’m recruiting a postdoctoral researcher on a fully funded 2-year contract. The topic is developing and implementing new parallel graph algorithms in Julia, with applications to data-driven transpor…

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## [Makie recipes on a Errorline like plot](https://discourse.julialang.org/t/makie-recipes-on-a-errorline-like-plot/133456)

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**Author:** [@dmetivie](https://discourse.julialang.org/u/dmetivie)\
**Replies:** 2\
**Last updated:** [October 27, 2025, 5:31pm UTC](https://discourse.julialang.org/t/makie-recipes-on-a-errorline-like-plot/133456 "2025-10-27T17:31:50Z")

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Using the new Makie 0.24 recipe system, I want to create the StatsPlots.jl recipe for errorline (see original definition). Here is a simplified version of the plume errorline. This might be very simple but could not fi…

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