# Latest

**URL:** https://discourse.julialang.org/latest.md?page=70

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

**Page:** 71

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## [How to efficiently update a Sparse Matrix (Diagonal + Sparse) in-place inside a hot loop?](https://discourse.julialang.org/t/how-to-efficiently-update-a-sparse-matrix-diagonal-sparse-in-place-inside-a-hot-loop/134705)

<div class="topic-metadata">

**Author:** [@Matt\_jl](https://discourse.julialang.org/u/Matt_jl)\
**Replies:** 3\
**Last updated:** [December 23, 2025, 3:51pm UTC](https://discourse.julialang.org/t/how-to-efficiently-update-a-sparse-matrix-diagonal-sparse-in-place-inside-a-hot-loop/134705 "2025-12-23T15:51:57Z")

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Hi everyone, I am working on an iterative algorithm where I need to construct and solve a linear system inside a “hot loop”. Currently, my code allocates a new sparse matrix A at every iteration because of the operati…

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## [Dynare perfect foresight simulation - how do I access solution to endogenous variables?](https://discourse.julialang.org/t/dynare-perfect-foresight-simulation-how-do-i-access-solution-to-endogenous-variables/83905)

<div class="topic-metadata">

**Author:** [@geekbear](https://discourse.julialang.org/u/geekbear)\
**Replies:** 4\
**Last updated:** [December 23, 2025, 3:10pm UTC](https://discourse.julialang.org/t/dynare-perfect-foresight-simulation-how-do-i-access-solution-to-endogenous-variables/83905 "2025-12-23T15:10:51Z")

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I ran the example1pf.mod from Dynare.jl on GitHub. I know output is stored in the .jld2 file in the “output” folder. But how do I actually access the solution to endogenous variables so that I can use them, e.g. plotting…

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## [\[ANN\] Shakira Warm Spectrum - Julia VS Code theme](https://discourse.julialang.org/t/ann-shakira-warm-spectrum-julia-vs-code-theme/134710)

<div class="topic-metadata">

**Author:** [@karei](https://discourse.julialang.org/u/karei)\
**Replies:** 0\
**Last updated:** [December 23, 2025, 2:54pm UTC](https://discourse.julialang.org/t/ann-shakira-warm-spectrum-julia-vs-code-theme/134710 "2025-12-23T14:54:05Z")

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Hi everyone, I’ve just published a small VS Code theme extension that’s tailored for Julia syntax highlighting: Shakira Warm Spectrum Dark Shakira Julia Light Install VS Code Marketplace: search Shakira Warm Spe…

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## [GLMakie heatmap and certain input matrix sizes](https://discourse.julialang.org/t/glmakie-heatmap-and-certain-input-matrix-sizes/134704)

<div class="topic-metadata">

**Author:** [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Replies:** 2\
**Last updated:** [December 23, 2025, 10:44am UTC](https://discourse.julialang.org/t/glmakie-heatmap-and-certain-input-matrix-sizes/134704 "2025-12-23T10:44:09Z")

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Hi, I’m trying to do the following: using GLMakie m = randn(45825,3) r,c = size(m) fig = Figure() ax = Axis(fig\[1,1\]) h = heatmap!(ax,1:r,1:c,m) But I get this error in my heatmap call: UNSUPPORTED (log once): P…

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## [Makie theme with transparent background not working](https://discourse.julialang.org/t/makie-theme-with-transparent-background-not-working/134694)

<div class="topic-metadata">

**Author:** [@danieleavitabile](https://discourse.julialang.org/u/danieleavitabile)\
**Replies:** 5\
**Last updated:** [December 23, 2025, 10:22am UTC](https://discourse.julialang.org/t/makie-theme-with-transparent-background-not-working/134694 "2025-12-23T10:22:49Z")

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I would like to set once and for all the background of my axes and figures to be transparent. I thought I could do that as a theme in Makie.jl. The following minimal code fails to produce a transparent background using …

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## [Julia -p N --project=... does not work](https://discourse.julialang.org/t/julia-p-n-project-does-not-work/134682)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 3\
**Last updated:** [December 23, 2025, 8:09am UTC](https://discourse.julialang.org/t/julia-p-n-project-does-not-work/134682 "2025-12-23T08:09:40Z")

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I was expecting the --project switch to apply to all processes, but apparently it does not. Is this a bug, or something by design? (I can work around this with @everywhere Pkg.activate(...), that is not the issue. I enc…

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## [JETLS warnings](https://discourse.julialang.org/t/jetls-warnings/134700)

<div class="topic-metadata">

**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 2\
**Last updated:** [December 23, 2025, 5:55am UTC](https://discourse.julialang.org/t/jetls-warnings/134700 "2025-12-23T05:55:35Z")

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I have the following code: local pos\_B, pos\_C, pos\_D for i in 1:4 particle=particles\[i\] x, y, z = particle\[1\], particle\[2\], particle\[3\] if i==2 pos\_B = SVector(x,y,z) …

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## [How to set nan\_color in Makie volume plot](https://discourse.julialang.org/t/how-to-set-nan-color-in-makie-volume-plot/134698)

<div class="topic-metadata">

**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 0\
**Last updated:** [December 22, 2025, 10:25pm UTC](https://discourse.julialang.org/t/how-to-set-nan-color-in-makie-volume-plot/134698 "2025-12-22T22:25:06Z")

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I want to set the nan\_color to :white or may be :green. How to do it? using GLMakie xmin, xmax, ymin, ymax, zmin, zmax = -3, 3, -3, 3, 1, 8; field = fill(NaN32, 50,50,50); fig = Figure() ax::LScene = LScene(fig\[1,1\]) vo…

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## [Bayesian Optimization with Julia](https://discourse.julialang.org/t/bayesian-optimization-with-julia/75143)

<div class="topic-metadata">

**Author:** [@xspeng](https://discourse.julialang.org/u/xspeng)\
**Replies:** 6\
**Last updated:** [December 22, 2025, 9:08pm UTC](https://discourse.julialang.org/t/bayesian-optimization-with-julia/75143 "2025-12-22T21:08:34Z")

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Hi, anyone knows how to use bayesian optimization to get the minimum value of a blackbox function, I read the manual of BayesianOptimization.jl https://github.com/jbrea/BayesianOptimization.jl but it’s not easy to unde…

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## [Silly question that's been bugging me about package naming](https://discourse.julialang.org/t/silly-question-thats-been-bugging-me-about-package-naming/134688)

<div class="topic-metadata">

**Author:** [@DoktorMike](https://discourse.julialang.org/u/DoktorMike)\
**Replies:** 4\
**Last updated:** [December 22, 2025, 5:31pm UTC](https://discourse.julialang.org/t/silly-question-thats-been-bugging-me-about-package-naming/134688 "2025-12-22T17:31:00Z")

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So in Package Naming Rules it’s clear that package names should contain .jl suffix. Package names already have a .jl extension, which communicates to users that Package.jl is a Julia package. Yet, the example of usin…

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## [Julia LSP in neovim 0.11](https://discourse.julialang.org/t/julia-lsp-in-neovim-0-11/129048)

<div class="topic-metadata">

**Author:** [@aris](https://discourse.julialang.org/u/aris)\
**Replies:** 7\
**Last updated:** [December 22, 2025, 7:26pm UTC](https://discourse.julialang.org/t/julia-lsp-in-neovim-0-11/129048 "2025-12-22T19:26:33Z")

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Hello everyone, Neovim 0.11 seems to have introduced some changes in the way lsp is configured, and it seems the julials install from Mason does not work out of the box at the moment (lsp quits returning 1 instead of 0,…

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## [Are there any examples of DiscreteProblem usage?](https://discourse.julialang.org/t/are-there-any-examples-of-discreteproblem-usage/134618)

<div class="topic-metadata">

**Author:** [@teacup775](https://discourse.julialang.org/u/teacup775)\
**Replies:** 3\
**Last updated:** [December 22, 2025, 4:58pm UTC](https://discourse.julialang.org/t/are-there-any-examples-of-discreteproblem-usage/134618 "2025-12-22T16:58:45Z")

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I have searched extensively online and cannot find anywhere a simple example of a set up for a discrete problem. A simply want an example of usage and set up.

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## [PID sampling time in modelingtoolkit](https://discourse.julialang.org/t/pid-sampling-time-in-modelingtoolkit/134671)

<div class="topic-metadata">

**Author:** [@victor](https://discourse.julialang.org/u/victor)\
**Replies:** 3\
**Last updated:** [December 22, 2025, 4:36pm UTC](https://discourse.julialang.org/t/pid-sampling-time-in-modelingtoolkit/134671 "2025-12-22T16:36:06Z")

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Hi. I’ve built a modelingtoolkit model to simulate my process system. It uses PID controllers, the issue is that the control system has a sampling time of 1s. This has a huge effect on the parameters for the controller a…

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## [Project for Intermediates - Advance](https://discourse.julialang.org/t/project-for-intermediates-advance/134653)

<div class="topic-metadata">

**Author:** [@AkshayJ](https://discourse.julialang.org/u/AkshayJ)\
**Replies:** 9\
**Last updated:** [December 22, 2025, 4:34pm UTC](https://discourse.julialang.org/t/project-for-intermediates-advance/134653 "2025-12-22T16:34:52Z")

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Hi, I lead a large program management in a manufacturing setting. Have recently gone through Julia and I see a big potential in making Julia work for Manufacturing Problem statements. What intermediate/Advanced projects …

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## [Good subsystems in Julia internals for new contributors?](https://discourse.julialang.org/t/good-subsystems-in-julia-internals-for-new-contributors/134668)

<div class="topic-metadata">

**Author:** [@Ark\_Gupta](https://discourse.julialang.org/u/Ark_Gupta)\
**Replies:** 2\
**Last updated:** [December 22, 2025, 11:10am UTC](https://discourse.julialang.org/t/good-subsystems-in-julia-internals-for-new-contributors/134668 "2025-12-22T11:10:15Z")

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Hi everyone, I’m exploring contributing to Julia internals and recently submitted a small README PR. I’d like to continue contributing more meaningfully and deepen my understanding of the codebase. Are there particula…

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## [ANN: BufIO: New I/O interfaces for Julia](https://discourse.julialang.org/t/ann-bufio-new-i-o-interfaces-for-julia/132347)

<div class="topic-metadata">

**Author:** [@jakobnissen](https://discourse.julialang.org/u/jakobnissen)\
**Replies:** 6\
**Last updated:** [December 22, 2025, 10:16am UTC](https://discourse.julialang.org/t/ann-bufio-new-i-o-interfaces-for-julia/132347 "2025-12-22T10:16:34Z")

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I’m pleased to announce a new package BufIO.jl. Overview of BufIO.jl BufIO provides new and improved I/O interfaces for Julia inspired by Rust, and designed around exposing buffers to users in order to explicitly copy b…

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## [\`app status\` only lists most recently installed](https://discourse.julialang.org/t/app-status-only-lists-most-recently-installed/134672)

<div class="topic-metadata">

**Author:** [@NonDairyNeutrino](https://discourse.julialang.org/u/NonDairyNeutrino)\
**Replies:** 0\
**Last updated:** [December 21, 2025, 8:32pm UTC](https://discourse.julialang.org/t/app-status-only-lists-most-recently-installed/134672 "2025-12-21T20:32:23Z")

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Not much more than the title actually. I have added both JuliaC and JETLS apps, but only the more recent of the them shows when invoking pkg\> app status. ~ $ julia -e 'using Pkg; Pkg.Apps.status()' \[acedd4c2\] JuliaC v0…

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## [Meshscatter shapes](https://discourse.julialang.org/t/meshscatter-shapes/134662)

<div class="topic-metadata">

**Author:** [@mahmah](https://discourse.julialang.org/u/mahmah)\
**Replies:** 2\
**Last updated:** [December 21, 2025, 12:38pm UTC](https://discourse.julialang.org/t/meshscatter-shapes/134662 "2025-12-21T12:38:39Z")

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A few questions concerning GLMakie meshscatter: how can I use some other shape instead of spheres? Where can I find what other kinds of shapes are a available? Can the orientation of these shapes be specified based on q…

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## [Testing Fixture library for Julia?](https://discourse.julialang.org/t/testing-fixture-library-for-julia/26703)

<div class="topic-metadata">

**Author:** [@00krishna](https://discourse.julialang.org/u/00krishna)\
**Replies:** 5\
**Last updated:** [December 21, 2025, 9:28am UTC](https://discourse.julialang.org/t/testing-fixture-library-for-julia/26703 "2025-12-21T09:28:06Z")

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Hey Folks. Is there a good “fixtures” library for unit testing in Julia? By fixtures I mean saving some data that I can use for different tests later. Here is my idea on using fixtures. I am not sure how most folks hand…

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## [Agents.jl periodic=true still gives space extent errors](https://discourse.julialang.org/t/agents-jl-periodic-true-still-gives-space-extent-errors/134605)

<div class="topic-metadata">

**Author:** [@BananaMaster3](https://discourse.julialang.org/u/BananaMaster3)\
**Replies:** 5\
**Last updated:** [December 21, 2025, 1:38am UTC](https://discourse.julialang.org/t/agents-jl-periodic-true-still-gives-space-extent-errors/134605 "2025-12-21T01:38:15Z")

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Hey all, I have a continuous, periodic space ABM. My ABM declaration looks like this: space2d = ContinuousSpace(extent; periodic=true, ); model = Agent…

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## [Discretised colors in 3D plot due to sampling](https://discourse.julialang.org/t/discretised-colors-in-3d-plot-due-to-sampling/134632)

<div class="topic-metadata">

**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 6\
**Last updated:** [December 20, 2025, 8:18pm UTC](https://discourse.julialang.org/t/discretised-colors-in-3d-plot-due-to-sampling/134632 "2025-12-20T20:18:09Z")

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I am getting discrete/pixelated colors in 3D plot due to sampling in field variable in MWE code below. Why it is discretized and how to solve it? using GLMakie r = Float32\[1.677044, 1.8385518, 2.0156136, 2.2097273, 2.42…

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## [\[ANN\] StructuralVibration.jl](https://discourse.julialang.org/t/ann-structuralvibration-jl/127978)

<div class="topic-metadata">

**Author:** [@Maucejo](https://discourse.julialang.org/u/Maucejo)\
**Replies:** 17\
**Last updated:** [December 20, 2025, 7:35pm UTC](https://discourse.julialang.org/t/ann-structuralvibration-jl/127978 "2025-12-20T19:35:26Z")

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Hi all, I am pleased to announce my first real contribution to the Julia environment. StructuralVibration.jl is intended to provide a set of tools for generating vibration data either to validate new numerical methods o…

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## [Genomic Annotation Package?](https://discourse.julialang.org/t/genomic-annotation-package/98255)

<div class="topic-metadata">

**Author:** [@hkhalil](https://discourse.julialang.org/u/hkhalil)\
**Replies:** 3\
**Last updated:** [December 20, 2025, 3:39pm UTC](https://discourse.julialang.org/t/genomic-annotation-package/98255 "2025-12-20T15:39:20Z")

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Hi everyone, I am new to Julia and BioJulia so this serves as an introduction as well! In my work, I make extensive use of R/Bioconductor and am excited to see the development of BioJulia and am looking to use Julia mor…

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## [Overdispersed alternative to multinomial](https://discourse.julialang.org/t/overdispersed-alternative-to-multinomial/134533)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 2\
**Last updated:** [December 20, 2025, 3:27pm UTC](https://discourse.julialang.org/t/overdispersed-alternative-to-multinomial/134533 "2025-12-20T15:27:25Z")

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I have a multilevel Bayesian model where (a\_i, b\_i, c\_i) = f(\\theta\_i) for each unit i = 1, \\dots, 1000, which are latent variables, f comes from a model. For each i, and j = 1, 2, 3, I observe (A\_{i,j}, B\_{i,j}, C\_{i,j…

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## [Makie textbox. cut & paste](https://discourse.julialang.org/t/makie-textbox-cut-paste/104625)

<div class="topic-metadata">

**Author:** [@bjarthur](https://discourse.julialang.org/u/bjarthur)\
**Replies:** 4\
**Last updated:** [December 20, 2025, 8:11am UTC](https://discourse.julialang.org/t/makie-textbox-cut-paste/104625 "2025-12-20T08:11:42Z")

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with GLMakie on a mac i can’t paste text into a Textbox. nor can i select text that’s already there so that i could subsequently copy or delete it. none of Textbox’s attributes give me hope that any of this is possible…

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## [Truncation error in ITensors SVD](https://discourse.julialang.org/t/truncation-error-in-itensors-svd/134559)

<div class="topic-metadata">

**Author:** [@diffeqslvr](https://discourse.julialang.org/u/diffeqslvr)\
**Replies:** 2\
**Last updated:** [December 19, 2025, 10:14pm UTC](https://discourse.julialang.org/t/truncation-error-in-itensors-svd/134559 "2025-12-19T22:14:05Z")

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I am trying to understand the truncation error when performing an SVD using ITensors. According to ITensor Examples · ITensors.jl, the truncation error is defined as sum\_{discarded n} lambda\_n^2 / sum\_{n} lambda\_n^2, whe…

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## [How to obtain the pvalues of the coefficients in GLM.jl?](https://discourse.julialang.org/t/how-to-obtain-the-pvalues-of-the-coefficients-in-glm-jl/9531)

<div class="topic-metadata">

**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 5\
**Last updated:** [December 19, 2025, 9:50pm UTC](https://discourse.julialang.org/t/how-to-obtain-the-pvalues-of-the-coefficients-in-glm-jl/9531 "2025-12-19T21:50:09Z")

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I have fitted a model using DataFrames df = DataFrame( x = 2\*y + 1 + rand(100), y = rand(100) ) using GLM mdl = lm(@formula(y~x), df) now I can see the pvalues of the coefficients. How do I obtain the pvalues and s…

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## [Does writing in parallel block the whole process?](https://discourse.julialang.org/t/does-writing-in-parallel-block-the-whole-process/134620)

<div class="topic-metadata">

**Author:** [@NonDairyNeutrino](https://discourse.julialang.org/u/NonDairyNeutrino)\
**Replies:** 4\
**Last updated:** [December 19, 2025, 8:37pm UTC](https://discourse.julialang.org/t/does-writing-in-parallel-block-the-whole-process/134620 "2025-12-19T20:37:43Z")

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Say I have a large piece of data data that I want to write or serialize (for speed) to a file file with serialize("path/to/file", data). Done naively, this will block the rest of the program from executing. So it’s simp…

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## [\`BinaryBuilder.jl\` steps after successful (manual) build](https://discourse.julialang.org/t/binarybuilder-jl-steps-after-successful-manual-build/134647)

<div class="topic-metadata">

**Author:** [@cgeoga](https://discourse.julialang.org/u/cgeoga)\
**Replies:** 2\
**Last updated:** [December 19, 2025, 8:37pm UTC](https://discourse.julialang.org/t/binarybuilder-jl-steps-after-successful-manual-build/134647 "2025-12-19T20:37:18Z")

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Hello, I have a piece of code that is in Rust that I want to make a dep of a Julia package. I have produced a build\_tarballs.jl for the library that runs successfully and have checked that the resulting jll library work…

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## [Julia 1.12.4 testing period](https://discourse.julialang.org/t/julia-1-12-4-testing-period/134641)

<div class="topic-metadata">

**Author:** [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)\
**Replies:** 0\
**Last updated:** [December 19, 2025, 1:56pm UTC](https://discourse.julialang.org/t/julia-1-12-4-testing-period/134641 "2025-12-19T13:56:40Z")

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The release-1.12 branch on the Julia repository now contains the set of commits we’re planning to tag as v1.12.4. The list of commits included since v1.12.4 is available here. As a patch release, it should be non-breakin…

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