# Latest

**URL:** https://discourse.julialang.org/latest.md?page=40

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

**Page:** 41

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## [Multithreading performance in different Julia versions](https://discourse.julialang.org/t/multithreading-performance-in-different-julia-versions/136538)

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**Author:** [@songjhaha](https://discourse.julialang.org/u/songjhaha)\
**Replies:** 0\
**Last updated:** [April 3, 2026, 8:05am UTC](https://discourse.julialang.org/t/multithreading-performance-in-different-julia-versions/136538 "2026-04-03T08:05:40Z")

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I found an example performances quite diff in Julia 1.10 vs other version in MWE: # GC.enable\_logging(true) function myinterp1(X, V, Xq, method) complex.( \_myinterp1(X, real(V), Xq, method), \_myinterp1(X, imag(…

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## [\[ANN\] QRStudio.jl - Cross platform Julia desktop application for Barcode and QR code processing](https://discourse.julialang.org/t/ann-qrstudio-jl-cross-platform-julia-desktop-application-for-barcode-and-qr-code-processing/136537)

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**Author:** [@Rakesh](https://discourse.julialang.org/u/Rakesh)\
**Replies:** 0\
**Last updated:** [April 3, 2026, 7:05am UTC](https://discourse.julialang.org/t/ann-qrstudio-jl-cross-platform-julia-desktop-application-for-barcode-and-qr-code-processing/136537 "2026-04-03T07:05:00Z")

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I’m excited to announce the release of QRStudio.jl, Cross-platform desktop application for Barcode and QR code processing, providing a unified interface for detection, visualization, and generation workflows. Features S…

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## [Best practices for listing organizations (logos, users, contributors) on JuliaHealth site?](https://discourse.julialang.org/t/best-practices-for-listing-organizations-logos-users-contributors-on-juliahealth-site/136535)

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**Author:** [@kosuri-indu](https://discourse.julialang.org/u/kosuri-indu)\
**Replies:** 0\
**Last updated:** [April 3, 2026, 5:57am UTC](https://discourse.julialang.org/t/best-practices-for-listing-organizations-logos-users-contributors-on-juliahealth-site/136535 "2026-04-03T05:57:37Z")

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Hello everyone! :waving\_hand: I am actually working on adding a section to the JuliaHealth website to highlight organizations using or contributing to the ecosystem (e.g., researchers, users, developers). This is loose…

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## [Can I create a null JuMP.VariableRef?](https://discourse.julialang.org/t/can-i-create-a-null-jump-variableref/136492)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 5\
**Last updated:** [April 3, 2026, 1:33am UTC](https://discourse.julialang.org/t/can-i-create-a-null-jump-variableref/136492 "2026-04-03T01:33:50Z")

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I can pre-allocate a JuMP.AffExpr(0.). But can I create a dumb x = JuMP.VariableRef(undef)? Then I can write something like v = JuMP.Containers.@container(\[i=1:3\], x) for i = 1:3 if i !== 3 v\[i\] = JuMP.@var…

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## [\[ANN\] Vecchia.jl: linear-cost differentiable approximations for Gaussian log-likelihoods](https://discourse.julialang.org/t/ann-vecchia-jl-linear-cost-differentiable-approximations-for-gaussian-log-likelihoods/71915)

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**Author:** [@cgeoga](https://discourse.julialang.org/u/cgeoga)\
**Replies:** 7\
**Last updated:** [April 2, 2026, 11:15pm UTC](https://discourse.julialang.org/t/ann-vecchia-jl-linear-cost-differentiable-approximations-for-gaussian-log-likelihoods/71915 "2026-04-02T23:15:08Z")

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Hi all. I’ve just registered Vecchia.jl, which provides functionality for a very convenient class of approximations for the Gaussian log-likelihood (as of now, only mean-zero, although for some technical reasons this is …

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## [Human pose estimation?](https://discourse.julialang.org/t/human-pose-estimation/136513)

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**Author:** [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Replies:** 2\
**Last updated:** [April 2, 2026, 9:15pm UTC](https://discourse.julialang.org/t/human-pose-estimation/136513 "2026-04-02T21:15:04Z")

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Is there any package for human pose estimation written in Julia?

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## [Cannot install OrdinaryDiffEq in Julia 1.10.11](https://discourse.julialang.org/t/cannot-install-ordinarydiffeq-in-julia-1-10-11/136518)

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**Author:** [@dmitry-kabanov](https://discourse.julialang.org/u/dmitry-kabanov)\
**Replies:** 16\
**Last updated:** [April 2, 2026, 4:50pm UTC](https://discourse.julialang.org/t/cannot-install-ordinarydiffeq-in-julia-1-10-11/136518 "2026-04-02T16:50:06Z")

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Hi, I was trying to install a new Julia (well, old) version to find a bug. So, I have used juliaup add 1.10 which results in the installation of the version 1.10.11. I have started that version with julia +1.10 --projec…

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## [Doctoral Researcher, Interdisciplinary Music Research, University of Jyväskylä, Finland](https://discourse.julialang.org/t/doctoral-researcher-interdisciplinary-music-research-university-of-jyvaskyla-finland/136514)

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**Author:** [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Replies:** 0\
**Last updated:** [April 2, 2026, 6:36am UTC](https://discourse.julialang.org/t/doctoral-researcher-interdisciplinary-music-research-university-of-jyvaskyla-finland/136514 "2026-04-02T06:36:17Z")

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Doctoral Researcher - Interdisciplinary Music Research (MUSICOTAS Project) The Department of Music, Art and Culture Studies of the University of Jyväskylä is currently seeking to recruit a Doctoral Researcher for a 3-yea…

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## [How to add a secondary y-axis (right-side axis) for a waterfall plot in Makie?](https://discourse.julialang.org/t/how-to-add-a-secondary-y-axis-right-side-axis-for-a-waterfall-plot-in-makie/136458)

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**Author:** [@arafune](https://discourse.julialang.org/u/arafune)\
**Replies:** 10\
**Last updated:** [April 2, 2026, 4:58am UTC](https://discourse.julialang.org/t/how-to-add-a-secondary-y-axis-right-side-axis-for-a-waterfall-plot-in-makie/136458 "2026-04-02T04:58:06Z")

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Hi everyone, I am trying to create a waterfall plot (stacked line plot) in Makie.jl as shown in the attached image (Fig1.jpg). I already know how to apply offsets to the lines to create the waterfall effect. However, I…

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## [How does the package manager decide which packages to prioritize when updating?](https://discourse.julialang.org/t/how-does-the-package-manager-decide-which-packages-to-prioritize-when-updating/136512)

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**Author:** [@johnb](https://discourse.julialang.org/u/johnb)\
**Replies:** 0\
**Last updated:** [April 1, 2026, 8:04pm UTC](https://discourse.julialang.org/t/how-does-the-package-manager-decide-which-packages-to-prioritize-when-updating/136512 "2026-04-01T20:04:10Z")

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I noticed today that I was using two packages which conflicted such that only one could be fully updated at a time. If I ran \]up, package A would be updated and package B was left not updated, but I had to manually add p…

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## [Renaming an existing package with changed capitalization](https://discourse.julialang.org/t/renaming-an-existing-package-with-changed-capitalization/136511)

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**Author:** [@becker0210](https://discourse.julialang.org/u/becker0210)\
**Replies:** 2\
**Last updated:** [April 1, 2026, 6:22pm UTC](https://discourse.julialang.org/t/renaming-an-existing-package-with-changed-capitalization/136511 "2026-04-01T18:22:07Z")

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Our organization is considering rebranding our software tool suite (several application interfaces and code-bases) which has been around for a long time (15+ years) and the name and capitalization is reflected in the cur…

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## [Filtering stack trace](https://discourse.julialang.org/t/filtering-stack-trace/136489)

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**Author:** [@Lincoln\_Hannah](https://discourse.julialang.org/u/Lincoln_Hannah)\
**Replies:** 2\
**Last updated:** [April 1, 2026, 5:38pm UTC](https://discourse.julialang.org/t/filtering-stack-trace/136489 "2026-04-01T17:38:14Z")

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Can I set a filter so the error message stack trace only shows lines from my .jl files? Not base Julia or downloaded packages. Or could you add a link at the top of the error message to the line in the stack trace that…

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## [Unable to add an issue in LinearSolve.jl](https://discourse.julialang.org/t/unable-to-add-an-issue-in-linearsolve-jl/136508)

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**Author:** [@John\_Washbourne](https://discourse.julialang.org/u/John_Washbourne)\
**Replies:** 2\
**Last updated:** [April 1, 2026, 5:14pm UTC](https://discourse.julialang.org/t/unable-to-add-an-issue-in-linearsolve-jl/136508 "2026-04-01T17:14:23Z")

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I am unable to add an issue or question at GitHub - SciML/LinearSolve.jl: LinearSolve.jl: High-Performance Unified Interface for Linear Solvers in Julia. Easily switch between factorization and Krylov methods, add precon…

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## [Julia not using the most recent version of Gurobi](https://discourse.julialang.org/t/julia-not-using-the-most-recent-version-of-gurobi/65539)

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**Author:** [@ZHEN\_LIN](https://discourse.julialang.org/u/ZHEN_LIN)\
**Replies:** 10\
**Last updated:** [April 1, 2026, 3:24pm UTC](https://discourse.julialang.org/t/julia-not-using-the-most-recent-version-of-gurobi/65539 "2026-04-01T15:24:38Z")

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I have been using Gurobi 9.0.1 in Julia with JuMP. Now I have installed Gurobi 9.1.2, but the output of Gurobi in Julia indicates that it is still using 9.0.1. How do I make it use the most recent version of Gurobi? I c…

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## [Turing Inference with MTK ODEProblem](https://discourse.julialang.org/t/turing-inference-with-mtk-odeproblem/136506)

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**Author:** [@bieniekmat](https://discourse.julialang.org/u/bieniekmat)\
**Replies:** 0\
**Last updated:** [April 1, 2026, 3:08pm UTC](https://discourse.julialang.org/t/turing-inference-with-mtk-odeproblem/136506 "2026-04-01T15:08:43Z")

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Hi, I am using Turing inference which draws uncertain parameters and then passes them on to the simulate kernel function. The kernel takes a pre-crated ODEProblem and applies the new parameters. The code works but is rea…

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## [PythonPlot not showing anything](https://discourse.julialang.org/t/pythonplot-not-showing-anything/136478)

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**Author:** [@Ferran\_Mazzanti](https://discourse.julialang.org/u/Ferran_Mazzanti)\
**Replies:** 5\
**Last updated:** [April 1, 2026, 12:39pm UTC](https://discourse.julialang.org/t/pythonplot-not-showing-anything/136478 "2026-04-01T12:39:36Z")

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Hi, I’ve just installed julia 1.12.5 on a new ubuntu box. First thing I tried was to install PythonPlot, and then on the repl using PythonPlot plot(rand(1000),randn(1000)) displays nothing at all. In old Pyplot.jl th…

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## [\[ANN\] NaturallyUnitful.jl Natural Units for Physicists](https://discourse.julialang.org/t/ann-naturallyunitful-jl-natural-units-for-physicists/24456)

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**Author:** [@Mason](https://discourse.julialang.org/u/Mason)\
**Replies:** 12\
**Last updated:** [April 1, 2026, 12:24pm UTC](https://discourse.julialang.org/t/ann-naturallyunitful-jl-natural-units-for-physicists/24456 "2026-04-01T12:24:33Z")

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NaturallyUnitful.jl is a little package I made for conveniently switching to so called ‘natural units’ where one sets ħ = c = ϵ₀ = kb = 1. It’s built on top of the wonderful Unitful.jl and in fact re-exports it so that u…

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## [CI Failing due to not having a package installed](https://discourse.julialang.org/t/ci-failing-due-to-not-having-a-package-installed/136463)

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**Author:** [@Mitch\_Phillipson](https://discourse.julialang.org/u/Mitch_Phillipson)\
**Replies:** 4\
**Last updated:** [April 1, 2026, 10:47am UTC](https://discourse.julialang.org/t/ci-failing-due-to-not-having-a-package-installed/136463 "2026-04-01T10:47:23Z")

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Hello, I have a package running a suite of tests on a few different Julia versions and OSs. I am getting a strange error on Julia-nightly - Windows-latest: ERROR: LoadError: ArgumentError: Package DataFrames \[a93c6f00-…

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## [Enzyme/Reactant: second-order AD (Laplacian) not working with Lux on GPU](https://discourse.julialang.org/t/enzyme-reactant-second-order-ad-laplacian-not-working-with-lux-on-gpu/136444)

<div class="topic-metadata">

**Author:** [@Ferran\_Mazzanti](https://discourse.julialang.org/u/Ferran_Mazzanti)\
**Replies:** 5\
**Last updated:** [April 1, 2026, 6:39am UTC](https://discourse.julialang.org/t/enzyme-reactant-second-order-ad-laplacian-not-working-with-lux-on-gpu/136444 "2026-04-01T06:39:23Z")

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Hi all, I’m implementing VMC (Variational Monte Carlo) for quantum many-body systems in the continuum, where I need to compute the Laplacian ∇²logψ/ψ of a neural network wavefunction. I’m trying to use Lux + Reactant +…

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## [Interactive line plots in documentation](https://discourse.julialang.org/t/interactive-line-plots-in-documentation/135537)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 9\
**Last updated:** [April 1, 2026, 5:15am UTC](https://discourse.julialang.org/t/interactive-line-plots-in-documentation/135537 "2026-04-01T05:15:16Z")

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What are options for embedding interactive line plots in a Documenter.jl page? I think it has to be some kind of JS. Export HTML with Bokeh.jl and embed it via an iframe. Bokeh.doc\_standalone\_html Export HTML with Plo…

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## [\[ANN\] UseAll.jl – Temporarily Demodularize Julia Code](https://discourse.julialang.org/t/ann-useall-jl-temporarily-demodularize-julia-code/136432)

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**Author:** [@PatrickHaecker](https://discourse.julialang.org/u/PatrickHaecker)\
**Replies:** 20\
**Last updated:** [April 1, 2026, 3:56am UTC](https://discourse.julialang.org/t/ann-useall-jl-temporarily-demodularize-julia-code/136432 "2026-04-01T03:56:57Z")

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I hereby announce the public release of UseAll.jl providing @useall which is effectively a small tool to ease REPL-based worflows by pulling the content of modules/packages into the current namespace. This simplifies de…

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## [Julia Pittsburgh Meetup](https://discourse.julialang.org/t/julia-pittsburgh-meetup/136486)

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**Author:** [@adolgert](https://discourse.julialang.org/u/adolgert)\
**Replies:** 0\
**Last updated:** [March 31, 2026, 11:15pm UTC](https://discourse.julialang.org/t/julia-pittsburgh-meetup/136486 "2026-03-31T23:15:30Z")

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Hi Pittsburgh Julians! I am reaching out to announce our next meeting, on April 7th, at 5 PM, in WEH 2327 (Wean Hall on Carnegie Mellon University campus). This is an informal meetup with no scheduled speaker. We have a…

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## [Why AIs tools can't find my book about Julia?](https://discourse.julialang.org/t/why-ais-tools-cant-find-my-book-about-julia/136466)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 8\
**Last updated:** [March 31, 2026, 7:36pm UTC](https://discourse.julialang.org/t/why-ais-tools-cant-find-my-book-about-julia/136466 "2026-03-31T19:36:00Z")

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So, I wrote a book about the julia syntax & its ecosystem, now in its 2nd edition. Sure, there are many better, more deep, or more specialized books… but honestly there are also a lot of low-quality books (that I have …

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## [Associativity / Commutativity for Boolean operations in SymbolicUtils.jl](https://discourse.julialang.org/t/associativity-commutativity-for-boolean-operations-in-symbolicutils-jl/136468)

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**Author:** [@logic](https://discourse.julialang.org/u/logic)\
**Replies:** 5\
**Last updated:** [March 31, 2026, 5:11pm UTC](https://discourse.julialang.org/t/associativity-commutativity-for-boolean-operations-in-symbolicutils-jl/136468 "2026-03-31T17:11:58Z")

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I’m working on a Boolean Algebra Rewriter with SymbolicUtils.jl, and I’ve noticed that for some reason, associativity and commutativity are not being properly applied for Boolean operations, which makes defining rules pa…

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## [How to debug a silent crash?](https://discourse.julialang.org/t/how-to-debug-a-silent-crash/136383)

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**Author:** [@AwesomeQuest](https://discourse.julialang.org/u/AwesomeQuest)\
**Replies:** 8\
**Last updated:** [March 31, 2026, 3:35pm UTC](https://discourse.julialang.org/t/how-to-debug-a-silent-crash/136383 "2026-03-31T15:35:07Z")

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I’m writing a script which calls a C library and the program is just stopping prematurely with no output. How do I debug this? A little context: I’m passing a Julia function as a callback to the SimpleBLE C library th…

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## [Equivalent of numpy.gradient in Julia](https://discourse.julialang.org/t/equivalent-of-numpy-gradient-in-julia/93172)

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**Author:** [@fdekerme](https://discourse.julialang.org/u/fdekerme)\
**Replies:** 24\
**Last updated:** [March 31, 2026, 10:52am UTC](https://discourse.julialang.org/t/equivalent-of-numpy-gradient-in-julia/93172 "2026-03-31T10:52:42Z")

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Hello, :grin: I need to calculate the gradient of a 3 dimensional matrix. Is there today in 2023 an equivalent of numpy.gradient in Julia?(numpy.gradient — NumPy v1.24 Manual) This question had already been asked, but …

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## [\[ANN\] Easier release automation with "Release Please" CI tool](https://discourse.julialang.org/t/ann-easier-release-automation-with-release-please-ci-tool/136452)

<div class="topic-metadata">

**Author:** [@MilesCranmer](https://discourse.julialang.org/u/MilesCranmer)\
**Replies:** 17\
**Last updated:** [March 31, 2026, 9:07am UTC](https://discourse.julialang.org/t/ann-easier-release-automation-with-release-please-ci-tool/136452 "2026-03-31T09:07:39Z")

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Release Please + Julia I made a Julia fork of Release Please. It has been useful enough that I thought it is worth sharing! For context, Release Please is a release automation tool. For every commit to a GitHub reposi…

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## [PythonPlot.streamplot error](https://discourse.julialang.org/t/pythonplot-streamplot-error/136365)

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**Author:** [@Wen-Wei\_Tseng](https://discourse.julialang.org/u/Wen-Wei_Tseng)\
**Replies:** 2\
**Last updated:** [March 31, 2026, 8:56am UTC](https://discourse.julialang.org/t/pythonplot-streamplot-error/136365 "2026-03-31T08:56:52Z")

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Hello, I was trying to generate a stream plot using PythonPlot.jl like this example: Julia\_Examples/pyplot\_streamplot.jl at master · gizmaa/Julia\_Examples · GitHub However, I was encounter an error while running the fol…

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## [Setindex! for sparse arrays](https://discourse.julialang.org/t/setindex-for-sparse-arrays/136414)

<div class="topic-metadata">

**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 5\
**Last updated:** [March 31, 2026, 3:48am UTC](https://discourse.julialang.org/t/setindex-for-sparse-arrays/136414 "2026-03-31T03:48:55Z")

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The question that follows was raised earlier at e.g. performance-enhancement-for-setindex-for-sparse-array. I remain confused regarding the use of sparse(Is,Js,As,\[n,n\]). profview shows that computation time is spend in…

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## [Improving the speed for the forward solve of a Universal Differential Equation (UDE)](https://discourse.julialang.org/t/improving-the-speed-for-the-forward-solve-of-a-universal-differential-equation-ude/130583)

<div class="topic-metadata">

**Author:** [@Ashima\_Kalathingal](https://discourse.julialang.org/u/Ashima_Kalathingal)\
**Replies:** 21\
**Last updated:** [March 30, 2026, 5:24pm UTC](https://discourse.julialang.org/t/improving-the-speed-for-the-forward-solve-of-a-universal-differential-equation-ude/130583 "2026-03-30T17:24:00Z")

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Hello everyone, I have a UDE here, and I am trying to improve its speed during the forward solve so that the optimization is also faster. Right now optimization part is very slow. Here is a working code you can try out …

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