# Latest

**URL:** https://discourse.julialang.org/latest.md?page=65

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

**Page:** 66

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## [Julia vs code extension reports opening package not part of my current envirionment](https://discourse.julialang.org/t/julia-vs-code-extension-reports-opening-package-not-part-of-my-current-envirionment/135016)

<div class="topic-metadata">

**Author:** [@lewis](https://discourse.julialang.org/u/lewis)\
**Replies:** 2\
**Last updated:** [January 13, 2026, 9:34pm UTC](https://discourse.julialang.org/t/julia-vs-code-extension-reports-opening-package-not-part-of-my-current-envirionment/135016 "2026-01-13T21:34:37Z")

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When a VS Code is opened with a project in the file explorer and a workbook is opened in a tab that comes from a different directory than the current project the extension reports You opened a Julia package that is not p…

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## [New ROOT.jl release, v0.4.0](https://discourse.julialang.org/t/new-root-jl-release-v0-4-0/135036)

<div class="topic-metadata">

**Author:** [@grasph](https://discourse.julialang.org/u/grasph)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 8:48pm UTC](https://discourse.julialang.org/t/new-root-jl-release-v0-4-0/135036 "2026-01-13T20:48:26Z")

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Dear all, Version 0.4.0 of ROOT.jl, presented at the ROOT users’ workshop was released Today in the General registry. This version, originally planned for November and delayed due to an issue when using Julia 1.12 prev…

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## [How to retrieve the time of events in a modeling toolkit solution?](https://discourse.julialang.org/t/how-to-retrieve-the-time-of-events-in-a-modeling-toolkit-solution/135009)

<div class="topic-metadata">

**Author:** [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Replies:** 6\
**Last updated:** [January 13, 2026, 8:17pm UTC](https://discourse.julialang.org/t/how-to-retrieve-the-time-of-events-in-a-modeling-toolkit-solution/135009 "2026-01-13T20:17:28Z")

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I have a MTK system with a @continuous\_events block. Is there a way to retrieve when these events are triggered somewhere in the solution ? I could not find anything about this in Event Handling and Callback Functions · …

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## [Isosurface in Makie](https://discourse.julialang.org/t/isosurface-in-makie/70034)

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**Author:** [@marianoarnaiz](https://discourse.julialang.org/u/marianoarnaiz)\
**Replies:** 4\
**Last updated:** [January 13, 2026, 7:39pm UTC](https://discourse.julialang.org/t/isosurface-in-makie/70034 "2026-01-13T19:39:39Z")

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Hi everyone. I have a set of 3D data that i need to plot with some isosurface: X,Y,Z,DATA. I am trying to do some fancy isosurface plot with vertical slices of the data and some isosurface on top (from perspective). I…

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## [Julia segmentation core dump error](https://discourse.julialang.org/t/julia-segmentation-core-dump-error/125599)

<div class="topic-metadata">

**Author:** [@Sachin\_thorat](https://discourse.julialang.org/u/Sachin_thorat)\
**Replies:** 24\
**Last updated:** [January 13, 2026, 7:27pm UTC](https://discourse.julialang.org/t/julia-segmentation-core-dump-error/125599 "2026-01-13T19:27:32Z")

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I have tried multiple re-installs for julia. But found no luck. The julia exits with a warning “core dumped” after I try to install packages. Same results occurred with installed julia using curl and while using the tar …

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## [How to plot the parallelized example in "Parallelized Morris and Sobol Sensitivity Analysis of an ODE"](https://discourse.julialang.org/t/how-to-plot-the-parallelized-example-in-parallelized-morris-and-sobol-sensitivity-analysis-of-an-ode/135034)

<div class="topic-metadata">

**Author:** [@kraqbi](https://discourse.julialang.org/u/kraqbi)\
**Replies:** 1\
**Last updated:** [January 13, 2026, 5:54pm UTC](https://discourse.julialang.org/t/how-to-plot-the-parallelized-example-in-parallelized-morris-and-sobol-sensitivity-analysis-of-an-ode/135034 "2026-01-13T17:54:12Z")

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Hello! I am trying GolbalSensitivity.jl for the first time, so please forgive me if this is a rookie mistake. I have trouble with the example in the doc : I reproduce the example until there : sobol\_result = gsa(f1,…

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## [\[ANN\] MiniEvents.jl - efficient continuos-time, discrete-events agent-based models](https://discourse.julialang.org/t/ann-minievents-jl-efficient-continuos-time-discrete-events-agent-based-models/135033)

<div class="topic-metadata">

**Author:** [@mhinsch](https://discourse.julialang.org/u/mhinsch)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 4:48pm UTC](https://discourse.julialang.org/t/ann-minievents-jl-efficient-continuos-time-discrete-events-agent-based-models/135033 "2026-01-13T16:48:45Z")

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MiniEvents.jl allows for the easy definition and efficient execution of continuous-time, discrete-events agent-based models (ABMs). Usually ABMs are defined in terms of discrete time steps, where each agent performs a nu…

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## [Difference between tstops and d\_discontinuities](https://discourse.julialang.org/t/difference-between-tstops-and-d-discontinuities/126847)

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**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 3\
**Last updated:** [January 13, 2026, 2:30pm UTC](https://discourse.julialang.org/t/difference-between-tstops-and-d-discontinuities/126847 "2026-01-13T14:30:38Z")

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The docstring says: • tstops: Denotes extra times that the timestepping algorithm must step to. This should be used to help the solver deal with discontinuities and singularities, since stepping exactly at t…

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## [\[ANN\] Epicycle.jl Initial Release (Space Mission Design and Trajectory Optimization)](https://discourse.julialang.org/t/ann-epicycle-jl-initial-release-space-mission-design-and-trajectory-optimization/135025)

<div class="topic-metadata">

**Author:** [@stevenhughes](https://discourse.julialang.org/u/stevenhughes)\
**Replies:** 1\
**Last updated:** [January 13, 2026, 2:03pm UTC](https://discourse.julialang.org/t/ann-epicycle-jl-initial-release-space-mission-design-and-trajectory-optimization/135025 "2026-01-13T14:03:32Z")

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Hi All, Here is a link to an Astro/Space Release announcement that I posted to Package Announcements. Posting link here in case you don’t watch that thread. \[ANN\] Epicycle.jl Initial Release - Space Mission Design and…

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## [Why does GridSpace zero/ negative coordinates yields an Error but still adds the agents to the model](https://discourse.julialang.org/t/why-does-gridspace-zero-negative-coordinates-yields-an-error-but-still-adds-the-agents-to-the-model/135020)

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**Author:** [@Farouk](https://discourse.julialang.org/u/Farouk)\
**Replies:** 3\
**Last updated:** [January 13, 2026, 11:25am UTC](https://discourse.julialang.org/t/why-does-gridspace-zero-negative-coordinates-yields-an-error-but-still-adds-the-agents-to-the-model/135020 "2026-01-13T11:25:18Z")

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Hello guys, I have a question regarding Agents.jl GridSpace does it allow coordinates that are negative or zero like (0,0) or (-5,-1). In the test I’ve done (See code below) when I put a zero coordinates it returns an …

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## [JuliaCon 2026: Call for proposals](https://discourse.julialang.org/t/juliacon-2026-call-for-proposals/135021)

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**Author:** [@vchuravy](https://discourse.julialang.org/u/vchuravy)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 10:32am UTC](https://discourse.julialang.org/t/juliacon-2026-call-for-proposals/135021 "2026-01-13T10:32:55Z")

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JuliaCon 2026 Call for Proposals This Call for Proposals will close on 2026-03-07T22:59:00Z (UTC) See the full Call for Proposal to submit! We invite you to submit proposals to give a presentation at JuliaCon Global 2…

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## [To what extent can JuMP's macro identify input expression and generate optimized backend codes?](https://discourse.julialang.org/t/to-what-extent-can-jumps-macro-identify-input-expression-and-generate-optimized-backend-codes/134983)

<div class="topic-metadata">

**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 12\
**Last updated:** [January 13, 2026, 6:24am UTC](https://discourse.julialang.org/t/to-what-extent-can-jumps-macro-identify-input-expression-and-generate-optimized-backend-codes/134983 "2026-01-13T06:24:05Z")

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JuMP’s macros are like magic black boxes to me. I’ve learned that one should generally make use of @variable, @constraints and @objective when constructing a model from scratch. But I have some small but nontrivial quest…

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## [Julia v1.13.0-beta1 is now available](https://discourse.julialang.org/t/julia-v1-13-0-beta1-is-now-available/135013)

<div class="topic-metadata">

**Author:** [@ararslan](https://discourse.julialang.org/u/ararslan)\
**Replies:** 0\
**Last updated:** [January 13, 2026, 3:12am UTC](https://discourse.julialang.org/t/julia-v1-13-0-beta1-is-now-available/135013 "2026-01-13T03:12:34Z")

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Julia version 1.13.0-beta1, the first beta pre-release in the upcoming 1.13 series of releases, is now available. Check out the NEWS.md file to see what will be new in 1.13. Binaries are available via JuliaUp and for man…

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## [Strange performance issue with using parsed commandline parameters in calculation](https://discourse.julialang.org/t/strange-performance-issue-with-using-parsed-commandline-parameters-in-calculation/135010)

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**Author:** [@Michael\_Wang](https://discourse.julialang.org/u/Michael_Wang)\
**Replies:** 6\
**Last updated:** [January 12, 2026, 10:29pm UTC](https://discourse.julialang.org/t/strange-performance-issue-with-using-parsed-commandline-parameters-in-calculation/135010 "2026-01-12T22:29:10Z")

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Hi. I am running into a strange performance issue when using parameters obtained from ArgParse.jl (also noted this in Performance issue when using parsed\_args in computation. · Issue #139 · carlobaldassi/ArgParse.jl · G…

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## [This month in Julia world - 2025-12](https://discourse.julialang.org/t/this-month-in-julia-world-2025-12/134979)

<div class="topic-metadata">

**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 12\
**Last updated:** [January 12, 2026, 8:20pm UTC](https://discourse.julialang.org/t/this-month-in-julia-world-2025-12/134979 "2026-01-12T20:20:20Z")

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A monthly newsletter, mostly on julia internals, digestible for casual observers. A biased, incomplete, editorialized list of what a clique of us found interesting this month, with contributions from the community. If y…

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## [Julia weird behavior with array passing between Julia and Python](https://discourse.julialang.org/t/julia-weird-behavior-with-array-passing-between-julia-and-python/135005)

<div class="topic-metadata">

**Author:** [@dmitry-kabanov](https://discourse.julialang.org/u/dmitry-kabanov)\
**Replies:** 4\
**Last updated:** [January 12, 2026, 7:43pm UTC](https://discourse.julialang.org/t/julia-weird-behavior-with-array-passing-between-julia-and-python/135005 "2026-01-12T19:43:40Z")

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Hi, I work on a project where users can use numerical solvers in a cross-language manner. In this project, arrays are passed as pointers to the actual data and re-wrapped in different languages according to their shap…

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## [Accessing LScene and Figure attributes from Makie Recipes](https://discourse.julialang.org/t/accessing-lscene-and-figure-attributes-from-makie-recipes/126320)

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**Author:** [@tonygem96](https://discourse.julialang.org/u/tonygem96)\
**Replies:** 1\
**Last updated:** [January 12, 2026, 7:14pm UTC](https://discourse.julialang.org/t/accessing-lscene-and-figure-attributes-from-makie-recipes/126320 "2026-01-12T19:14:41Z")

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Is it possible to access figure level or LScene level attributes from a Makie recipe? For example, in the MWE below, myplot(::MyTypeA) defaults to an LScene. Can I control show\_axis=false from within the recipe? I under…

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## [Issue: Passing \`scenekw\` Arguments in Makie Recipes](https://discourse.julialang.org/t/issue-passing-scenekw-arguments-in-makie-recipes/131945)

<div class="topic-metadata">

**Author:** [@prittjam](https://discourse.julialang.org/u/prittjam)\
**Replies:** 4\
**Last updated:** [January 12, 2026, 7:13pm UTC](https://discourse.julialang.org/t/issue-passing-scenekw-arguments-in-makie-recipes/131945 "2026-01-12T19:13:45Z")

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I am unable to pass scenekw arguments through a Makie recipe such that the LScene is constructed correctly. Regardless of what I try, the result is always a perspective view with axes. My understanding is that Makie re…

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## [Adding a sensor breaks MTK model](https://discourse.julialang.org/t/adding-a-sensor-breaks-mtk-model/134964)

<div class="topic-metadata">

**Author:** [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Replies:** 5\
**Last updated:** [January 12, 2026, 4:59pm UTC](https://discourse.julialang.org/t/adding-a-sensor-breaks-mtk-model/134964 "2026-01-12T16:59:37Z")

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For some reason, adding a ForceSensor from ModelingToolkitStandardLibrary breaks the following model. using ModelingToolkit import ModelingToolkit: connect, t\_nounits as t, D\_nounits as D using ModelingToolkitStandardLi…

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## [\[ANN\] Glossaries.jl](https://discourse.julialang.org/t/ann-glossaries-jl/134991)

<div class="topic-metadata">

**Author:** [@kellertuer](https://discourse.julialang.org/u/kellertuer)\
**Replies:** 10\
**Last updated:** [January 12, 2026, 3:22pm UTC](https://discourse.julialang.org/t/ann-glossaries-jl/134991 "2026-01-12T15:22:23Z")

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When you are writing documentation for a package, it might happen that you are repeating yourself when a certain parameter appears in several functions when a certain field appears in several structs when keywords are …

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## [\`AstroFITS\` a new package for easy access to FITS files](https://discourse.julialang.org/t/astrofits-a-new-package-for-easy-access-to-fits-files/135001)

<div class="topic-metadata">

**Author:** [@emmt](https://discourse.julialang.org/u/emmt)\
**Replies:** 1\
**Last updated:** [January 12, 2026, 2:26pm UTC](https://discourse.julialang.org/t/astrofits-a-new-package-for-easy-access-to-fits-files/135001 "2026-01-12T14:26:36Z")

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I am happy to announce AstroFITS, a new official package (formerly EasyFITS) for easy access to FITS files widely used in astronomy to store data. The ideas leading to AstroFITS were to be produce code that makes clear …

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## [\[ANN\] MiniObserve.jl](https://discourse.julialang.org/t/ann-miniobserve-jl/135002)

<div class="topic-metadata">

**Author:** [@mhinsch](https://discourse.julialang.org/u/mhinsch)\
**Replies:** 0\
**Last updated:** [January 12, 2026, 1:52pm UTC](https://discourse.julialang.org/t/ann-miniobserve-jl/135002 "2026-01-12T13:52:14Z")

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MiniObserve makes it easy to declare a set of variables to extract from a complex object (such as a simulation model) and write them to a CSV file or append them to a DataFrame. Simulation models often have to keep trac…

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## [Cartesian Indices Sequence on the GPU](https://discourse.julialang.org/t/cartesian-indices-sequence-on-the-gpu/134998)

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**Author:** [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)\
**Replies:** 0\
**Last updated:** [January 12, 2026, 8:24am UTC](https://discourse.julialang.org/t/cartesian-indices-sequence-on-the-gpu/134998 "2026-01-12T08:24:05Z")

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I have an array of integers i, e.g. \[3,1,2\], and I want to map them to Cartesian indices \[(1, 3), (2, 1), (3, 2)\]. On the CPU, the easy way of creating this array is CartesianIndex.(enumerate(i)). However this does not …

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## [ModelingToolkit compiler does not simplify as expected](https://discourse.julialang.org/t/modelingtoolkit-compiler-does-not-simplify-as-expected/134978)

<div class="topic-metadata">

**Author:** [@PhysicsBender](https://discourse.julialang.org/u/PhysicsBender)\
**Replies:** 9\
**Last updated:** [January 12, 2026, 7:01am UTC](https://discourse.julialang.org/t/modelingtoolkit-compiler-does-not-simplify-as-expected/134978 "2026-01-12T07:01:56Z")

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I have noticed that the ModelingToolkit compiler does not simplify systems as expected, creating more unknowns and differential equations. At first I thought it was because it was finding linear systems that it was unabl…

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## [Specifying objective coefficient when creating a JuMP variable](https://discourse.julialang.org/t/specifying-objective-coefficient-when-creating-a-jump-variable/134923)

<div class="topic-metadata">

**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 5\
**Last updated:** [January 12, 2026, 3:36am UTC](https://discourse.julialang.org/t/specifying-objective-coefficient-when-creating-a-jump-variable/134923 "2026-01-12T03:36:47Z")

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What about adding a kwarg option obj in JuMP.@variable so that we can specify objective coefficients? just like the existing lower\_bound? julia\> import JuMP julia\> model = JuMP.Model(); julia\> JuMP.set\_objective\_sense…

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## [Package naming guidelines](https://discourse.julialang.org/t/package-naming-guidelines/7140)

<div class="topic-metadata">

**Author:** [@John\_Gibson](https://discourse.julialang.org/u/John_Gibson)\
**Replies:** 57\
**Last updated:** [January 11, 2026, 10:22pm UTC](https://discourse.julialang.org/t/package-naming-guidelines/7140 "2026-01-11T22:22:44Z")

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For 1.0 I would like to see all major packages adhere to the Guidelines for Naming Packages, especially spelling out acronyms in package names unless they’re completely obvious and unambigous. E.g. SVD would be ok as a p…

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## [Using @assert in another macro](https://discourse.julialang.org/t/using-assert-in-another-macro/134990)

<div class="topic-metadata">

**Author:** [@densmojd](https://discourse.julialang.org/u/densmojd)\
**Replies:** 2\
**Last updated:** [January 11, 2026, 7:19pm UTC](https://discourse.julialang.org/t/using-assert-in-another-macro/134990 "2026-01-11T19:19:19Z")

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I’m attempting to use @assert in the definition of another macro, and I cannot get the message associated with the AssertionError to be formed correctly. Here’s an MWE: macro my\_assert(arg) return :(@assert $(esc(a…

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## [Reflections on Developer Experience After Building a Large Julia Codebase](https://discourse.julialang.org/t/reflections-on-developer-experience-after-building-a-large-julia-codebase/134732)

<div class="topic-metadata">

**Author:** [@cuihantao](https://discourse.julialang.org/u/cuihantao)\
**Replies:** 33\
**Last updated:** [January 11, 2026, 6:24pm UTC](https://discourse.julialang.org/t/reflections-on-developer-experience-after-building-a-large-julia-codebase/134732 "2026-01-11T18:24:18Z")

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I want to share my experience developing a Julia codebase for an project on high-performance simulation. It is from the experience of porting a ~80k line Python research code to Julia. Strictly speaking, it is not a “por…

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## [How can I implement a vector of StaticArrays as a variable in MTK?](https://discourse.julialang.org/t/how-can-i-implement-a-vector-of-staticarrays-as-a-variable-in-mtk/134962)

<div class="topic-metadata">

**Author:** [@pmc4](https://discourse.julialang.org/u/pmc4)\
**Replies:** 6\
**Last updated:** [January 11, 2026, 5:13pm UTC](https://discourse.julialang.org/t/how-can-i-implement-a-vector-of-staticarrays-as-a-variable-in-mtk/134962 "2026-01-11T17:13:01Z")

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Hi everyone. After trying for weeks I would like to ask the community if what I’m trying to do is possible or whether I have arrived to a dead end. I’ve reduced it to a MWE. The system I want to solve in ModelingToolkit…

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## [Not resolving .jl links if https://juliaregistries.github.io doesn't have it](https://discourse.julialang.org/t/not-resolving-jl-links-if-https-juliaregistries-github-io-doesnt-have-it/134989)

<div class="topic-metadata">

**Author:** [@Syx\_Pek](https://discourse.julialang.org/u/Syx_Pek)\
**Replies:** 4\
**Last updated:** [January 11, 2026, 2:02pm UTC](https://discourse.julialang.org/t/not-resolving-jl-links-if-https-juliaregistries-github-io-doesnt-have-it/134989 "2026-01-11T14:02:13Z")

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I’ve noticed that discourse has been eagerly putting links to https://juliaregistries.github.io for anything of the form \[A-Za-z\]+\\.jl. However, it is a bit too eager in doing so in many places where the project is share…

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