# Latest

**URL:** https://discourse.julialang.org/latest.md?page=86

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

**Page:** 87

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## [Modelling toolkit for simulating aerodynamics?](https://discourse.julialang.org/t/modelling-toolkit-for-simulating-aerodynamics/133739)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 1\
**Last updated:** [November 9, 2025, 4:26pm UTC](https://discourse.julialang.org/t/modelling-toolkit-for-simulating-aerodynamics/133739 "2025-11-09T16:26:14Z")

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Not so clear to me: What is the domain of MTK where using MTK to create models is a good choice? In particular, we have a package for modelling aerodynamic forces and moments of 3D wings: GitHub - OpenSourceAWE/VortexSt…

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## [Symbolics.jl: \`simplify\` is inconsistent when changing the number of terms](https://discourse.julialang.org/t/symbolics-jl-simplify-is-inconsistent-when-changing-the-number-of-terms/133751)

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**Author:** [@JaydevSR](https://discourse.julialang.org/u/JaydevSR)\
**Replies:** 3\
**Last updated:** [November 9, 2025, 4:15pm UTC](https://discourse.julialang.org/t/symbolics-jl-simplify-is-inconsistent-when-changing-the-number-of-terms/133751 "2025-11-09T16:15:31Z")

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I am using simplify for the below terms: for which I get the following result: As you can see that depending on the number of terms in the expressions, it gives inconsistent results. For some terms it’s able to c…

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## [Will Julia exits only after all threads get their tasks done?](https://discourse.julialang.org/t/will-julia-exits-only-after-all-threads-get-their-tasks-done/133744)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 4\
**Last updated:** [November 9, 2025, 3:58pm UTC](https://discourse.julialang.org/t/will-julia-exits-only-after-all-threads-get-their-tasks-done/133744 "2025-11-09T15:58:26Z")

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From this link Can the threads in the :interactive pool also undertake heavy computing tasks? - #9 by WalterMadelim I find that this behavior is puzzling: Define this file s.jl function bzwt(t) tdue = time\_ns(…

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## [Integrating symbolic functions?](https://discourse.julialang.org/t/integrating-symbolic-functions/102545)

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**Author:** [@GregVernon](https://discourse.julialang.org/u/GregVernon)\
**Replies:** 18\
**Last updated:** [November 9, 2025, 3:29pm UTC](https://discourse.julialang.org/t/integrating-symbolic-functions/102545 "2025-11-09T15:29:33Z")

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I’m trying to perform indefinite and/or definite integrals using Symbolics.Integral(), but I can’t seem to find documentation on how to use it (though, most of Symbolics.jl methods appear undocumented). Currently, thro…

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## [How to visualize infinite lines with Makie.jl?](https://discourse.julialang.org/t/how-to-visualize-infinite-lines-with-makie-jl/100325)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 9\
**Last updated:** [November 8, 2025, 10:56pm UTC](https://discourse.julialang.org/t/how-to-visualize-infinite-lines-with-makie-jl/100325 "2025-11-08T22:56:32Z")

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Say I have an infinite line passing through the points (0,0,0) and (1,1,1) in 3D. How to visualize this line in Makie so that it is always visible no matter the level of zoom?

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## [Decompression of large files](https://discourse.julialang.org/t/decompression-of-large-files/132191)

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**Author:** [@mdotend](https://discourse.julialang.org/u/mdotend)\
**Replies:** 11\
**Last updated:** [November 8, 2025, 6:40pm UTC](https://discourse.julialang.org/t/decompression-of-large-files/132191 "2025-11-08T18:40:51Z")

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Hey there, I am currently trying to work with dumps of reddit data which is alot of compressed json data in the zst format (e.g. 11GB for one month of submissions). When I try to read lines from that data I get an unspe…

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## [Building Julia on Mac: python not found](https://discourse.julialang.org/t/building-julia-on-mac-python-not-found/133731)

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**Author:** [@Eben60](https://discourse.julialang.org/u/Eben60)\
**Replies:** 3\
**Last updated:** [November 8, 2025, 9:46am UTC](https://discourse.julialang.org/t/building-julia-on-mac-python-not-found/133731 "2025-11-08T09:46:33Z")

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Running make results in xcode-select: Failed to locate 'python', requesting installation of command line developer tools. command line developer tools had been installed, but on getting prompt I downloaded it (again) t…

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## [Do zero ao Julia](https://discourse.julialang.org/t/do-zero-ao-julia/133743)

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**Author:** [@lmiq](https://discourse.julialang.org/u/lmiq)\
**Replies:** 2\
**Last updated:** [November 8, 2025, 7:26am UTC](https://discourse.julialang.org/t/do-zero-ao-julia/133743 "2025-11-08T07:26:28Z")

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I thought this project deserves some advertising. These are undergraduate students from the Statistics course of University of Campinas (Brazil), which are gathering lots of information, interviews, case studies, etc, ab…

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## [Type instability in a simple function](https://discourse.julialang.org/t/type-instability-in-a-simple-function/133736)

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**Author:** [@atthom](https://discourse.julialang.org/u/atthom)\
**Replies:** 5\
**Last updated:** [November 8, 2025, 5:09am UTC](https://discourse.julialang.org/t/type-instability-in-a-simple-function/133736 "2025-11-08T05:09:00Z")

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I try as much as possible to remove type instabilities, as suggested in Julia’s Performance Tips. I wasn’t able to find the trick on this function, although it’s quite simple. function parameters() TARGET = Int\[88,…

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## [Can the threads in the :interactive pool also undertake heavy computing tasks?](https://discourse.julialang.org/t/can-the-threads-in-the-interactive-pool-also-undertake-heavy-computing-tasks/133725)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 7\
**Last updated:** [November 8, 2025, 1:15am UTC](https://discourse.julialang.org/t/can-the-threads-in-the-interactive-pool-also-undertake-heavy-computing-tasks/133725 "2025-11-08T01:15:17Z")

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(From a related issue Unsticky Tasks stick to threadpool since 1.10, causing issues since 1.12 · Issue #59936 · JuliaLang/julia · GitHub But here I’m not referring to the functional API Task, instead, I’m talking about @…

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## [Has anyone tried implementing the LiMuon Optimizer?](https://discourse.julialang.org/t/has-anyone-tried-implementing-the-limuon-optimizer/132742)

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**Author:** [@DoktorMike](https://discourse.julialang.org/u/DoktorMike)\
**Replies:** 2\
**Last updated:** [November 7, 2025, 8:33pm UTC](https://discourse.julialang.org/t/has-anyone-tried-implementing-the-limuon-optimizer/132742 "2025-11-07T20:33:54Z")

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Has anyone tried implementing the LiMuon optimizer? I made an issue here in the Optimisers.jl package but thought I’d ask here as well if someone has implemented it elsewhere? Also any hands on experience with the metho…

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## [Contains vs occursin](https://discourse.julialang.org/t/contains-vs-occursin/133737)

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**Author:** [@Queenvictoria](https://discourse.julialang.org/u/Queenvictoria)\
**Replies:** 2\
**Last updated:** [November 7, 2025, 8:22pm UTC](https://discourse.julialang.org/t/contains-vs-occursin/133737 "2025-11-07T20:22:39Z")

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Is there any functional difference between contains and occursin? Is it up to preference?

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## [How to visualize NaNs in an array?](https://discourse.julialang.org/t/how-to-visualize-nans-in-an-array/133738)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 7\
**Last updated:** [November 7, 2025, 7:04pm UTC](https://discourse.julialang.org/t/how-to-visualize-nans-in-an-array/133738 "2025-11-07T19:04:03Z")

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I have a 2D array of size 150x150, and for debugging purposes, I want to see in the REPL where the NaNs are in this array. How would you do that?

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## [Issue with SS.solve using DynamicSS method in SteadyStateDiffEq](https://discourse.julialang.org/t/issue-with-ss-solve-using-dynamicss-method-in-steadystatediffeq/133712)

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**Author:** [@Bill\_Holmes](https://discourse.julialang.org/u/Bill_Holmes)\
**Replies:** 3\
**Last updated:** [November 7, 2025, 5:13pm UTC](https://discourse.julialang.org/t/issue-with-ss-solve-using-dynamicss-method-in-steadystatediffeq/133712 "2025-11-07T17:13:21Z")

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I have a quick question about using SteadyStateDiffEq.jl. I am getting error behavior when trying to use the DynamicSS method (following Steady State Solvers · DifferentialEquations.jl). Below is a MWE. I 1) define a sta…

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## [Change local of instalation of \\.julia](https://discourse.julialang.org/t/change-local-of-instalation-of-julia/54010)

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**Author:** [@angeloaliano1](https://discourse.julialang.org/u/angeloaliano1)\
**Replies:** 12\
**Last updated:** [November 7, 2025, 3:16pm UTC](https://discourse.julialang.org/t/change-local-of-instalation-of-julia/54010 "2025-11-07T15:16:06Z")

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Dear all, I having problems with my user’s name: C:\\Users\\Usuário\\.julia (from Brazil), where all packages are installed (because the name “Usuário”). However, I cannot control where packages are installed neither the …

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## [Parse with exponent D](https://discourse.julialang.org/t/parse-with-exponent-d/133715)

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**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 4\
**Last updated:** [November 7, 2025, 1:24pm UTC](https://discourse.julialang.org/t/parse-with-exponent-d/133715 "2025-11-07T13:24:04Z")

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I tried parsing the values printed to file by some old Fortran code. This code uses the exponent D for double precision numbers, like 2.73150000000000003D+02. I can use the replace command to replace the “D” with “E”, …

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## [\`in\` as variable name leads to calling of variable](https://discourse.julialang.org/t/in-as-variable-name-leads-to-calling-of-variable/133733)

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**Author:** [@ncxst](https://discourse.julialang.org/u/ncxst)\
**Replies:** 1\
**Last updated:** [November 7, 2025, 1:09pm UTC](https://discourse.julialang.org/t/in-as-variable-name-leads-to-calling-of-variable/133733 "2025-11-07T13:09:10Z")

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I stumbled across code that uses in as a variable name, which confused me, so I tried to see when using keywords as variables breaks. First a few examples where everything is fine: julia\> f(in, out) = in + out f (generi…

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## [\[ANN\] SmallCollections.jl: fast small vectors, sets and dictionaries](https://discourse.julialang.org/t/ann-smallcollections-jl-fast-small-vectors-sets-and-dictionaries/128787)

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**Author:** [@matthias314](https://discourse.julialang.org/u/matthias314)\
**Replies:** 9\
**Last updated:** [November 7, 2025, 1:01pm UTC](https://discourse.julialang.org/t/ann-smallcollections-jl-fast-small-vectors-sets-and-dictionaries/128787 "2025-11-07T13:01:55Z")

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The standard container types in Julia (Vector, Set, Dict) can hold an arbitrary number of elements. If the size is known in advance, one can use dedicated types like SVector or MVector from StaticArrays.jl that are much …

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## [Does TestItems work in julia 1.12 using new package workspace feature](https://discourse.julialang.org/t/does-testitems-work-in-julia-1-12-using-new-package-workspace-feature/133722)

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**Author:** [@brianguenter](https://discourse.julialang.org/u/brianguenter)\
**Replies:** 2\
**Last updated:** [November 7, 2025, 12:49pm UTC](https://discourse.julialang.org/t/does-testitems-work-in-julia-1-12-using-new-package-workspace-feature/133722 "2025-11-07T12:49:56Z")

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I just switched one of my packages to use the new workspace system, where the test directory has its own Project.toml. Tests run correctly from the REPL but when I try to use the VSCode testing framework none of the tes…

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## [Wrapping CUDA.jl with juliacall](https://discourse.julialang.org/t/wrapping-cuda-jl-with-juliacall/133554)

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**Author:** [@chrissm23](https://discourse.julialang.org/u/chrissm23)\
**Replies:** 4\
**Last updated:** [November 7, 2025, 9:09am UTC](https://discourse.julialang.org/t/wrapping-cuda-jl-with-juliacall/133554 "2025-11-07T09:09:08Z")

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Hello everyone! I’m trying to make a Python wrapper using PythonCall.jl for a Julia package that uses CUDA.jl. The package initializes random integers from a UnitRange using the CPU’s Random.rand into a Matrix and then …

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## [R in Julia on Android works great :-) (Screenshot)](https://discourse.julialang.org/t/r-in-julia-on-android-works-great-screenshot/133719)

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**Author:** [@Mike\_Stein](https://discourse.julialang.org/u/Mike_Stein)\
**Replies:** 2\
**Last updated:** [November 6, 2025, 11:12pm UTC](https://discourse.julialang.org/t/r-in-julia-on-android-works-great-screenshot/133719 "2025-11-06T23:12:40Z")

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Having fun with Julia and R setup in Termux on Android with RCall julia library and being able to toggle in between them. For some reason not able to install.packages in R in Julia but not a big deal since can just inst…

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## [Workspaces + Monorepo of unregistered packages](https://discourse.julialang.org/t/workspaces-monorepo-of-unregistered-packages/133005)

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**Author:** [@nandoconde](https://discourse.julialang.org/u/nandoconde)\
**Replies:** 19\
**Last updated:** [November 6, 2025, 10:35pm UTC](https://discourse.julialang.org/t/workspaces-monorepo-of-unregistered-packages/133005 "2025-11-06T22:35:12Z")

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Hello! I was reading the Julia v1.12 release blog post and read about the use of the workspace feature and how it can help with monorepos. Right now, I have several unregistered interdependent packages and the approach…

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## [Threads.@threads on views into a vector doesn't give much of a speed-up](https://discourse.julialang.org/t/threads-threads-on-views-into-a-vector-doesnt-give-much-of-a-speed-up/133713)

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**Author:** [@jlbosse](https://discourse.julialang.org/u/jlbosse)\
**Replies:** 3\
**Last updated:** [November 6, 2025, 9:16pm UTC](https://discourse.julialang.org/t/threads-threads-on-views-into-a-vector-doesnt-give-much-of-a-speed-up/133713 "2025-11-06T21:16:40Z")

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I am trying to speed my code up using the Threads.@threads macro and splitting an array into multiple views so that each thread works on a separate view, but am not getting the performance gains I had hoped for. Conside…

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## [Is there a keyword opposite of 'end' when indexing](https://discourse.julialang.org/t/is-there-a-keyword-opposite-of-end-when-indexing/133714)

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**Author:** [@Queenvictoria](https://discourse.julialang.org/u/Queenvictoria)\
**Replies:** 2\
**Last updated:** [November 6, 2025, 6:18pm UTC](https://discourse.julialang.org/t/is-there-a-keyword-opposite-of-end-when-indexing/133714 "2025-11-06T18:18:55Z")

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name\[end\] gives you the last value. But when I learned it, I could’ve sworn there was a keyword for the very first value. Obviously you can just index at one, but does that keyword exist? Or did I make it up?

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## [Machine Learning and Artificial Intelligence](https://discourse.julialang.org/t/machine-learning-and-artificial-intelligence/196)

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**Author:** [@tbreloff](https://discourse.julialang.org/u/tbreloff)\
**Replies:** 21\
**Last updated:** [November 6, 2025, 2:24pm UTC](https://discourse.julialang.org/t/machine-learning-and-artificial-intelligence/196 "2025-11-06T14:24:55Z")

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Discussion and questions related to Machine Learning and Artificial Intelligence in Julia, including the JuliaML organization.

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## [Possible grammar error in blog announcement](https://discourse.julialang.org/t/possible-grammar-error-in-blog-announcement/133697)

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**Author:** [@phma](https://discourse.julialang.org/u/phma)\
**Replies:** 1\
**Last updated:** [November 6, 2025, 2:06pm UTC](https://discourse.julialang.org/t/possible-grammar-error-in-blog-announcement/133697 "2025-11-06T14:06:51Z")

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Both contain this sentence: Each project in a workspace can include their own dependencies, compatibility information, and even function as full packages. This is the conjunction of the three sentences: Each pro…

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## [Electric Field Simulation Cyclotron](https://discourse.julialang.org/t/electric-field-simulation-cyclotron/133708)

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**Author:** [@mpirke](https://discourse.julialang.org/u/mpirke)\
**Replies:** 0\
**Last updated:** [November 6, 2025, 12:48pm UTC](https://discourse.julialang.org/t/electric-field-simulation-cyclotron/133708 "2025-11-06T12:48:57Z")

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Hi there! I recently gave a tutorial for a physics course, where we discussed how a cyclotron works. Often one reads that in the gap between the electrodes the electric field is uniform, similar to a plate capacitor and…

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## [Basic Molly questions](https://discourse.julialang.org/t/basic-molly-questions/133282)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 35\
**Last updated:** [November 6, 2025, 10:33am UTC](https://discourse.julialang.org/t/basic-molly-questions/133282 "2025-11-06T10:33:29Z")

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I’m playing around with Molly.jl. Not really my field, but some colleagues worked with molecule simulations in the 1990s, so I have been exposed to the basic ideas. I also simulated a set of 5 Argon molecules in 2D, boxe…

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## [Swirl for Julia?](https://discourse.julialang.org/t/swirl-for-julia/86987)

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**Author:** [@Alex\_Tantos](https://discourse.julialang.org/u/Alex_Tantos)\
**Replies:** 4\
**Last updated:** [November 6, 2025, 10:31am UTC](https://discourse.julialang.org/t/swirl-for-julia/86987 "2025-11-06T10:31:09Z")

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Hi. Is anybody aware of any ready-made console-based learning platform (in the form of a package perhaps?) for Julia similar to swirl ? Thanks! Alex

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## [How to reinit NonlinearSolve.jl problem/integrator?](https://discourse.julialang.org/t/how-to-reinit-nonlinearsolve-jl-problem-integrator/109536)

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**Author:** [@jamblejoe](https://discourse.julialang.org/u/jamblejoe)\
**Replies:** 5\
**Last updated:** [November 5, 2025, 11:47pm UTC](https://discourse.julialang.org/t/how-to-reinit-nonlinearsolve-jl-problem-integrator/109536 "2025-11-05T23:47:14Z")

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Consider f(u, p) = u .\* u .- p u0 = @SVector\[1.0, 1.0\] prob = NonlinearProblem(f, u0, \[1\]) solver = solve(prob) How do I reinitialize the problem or the underlying integrator/cache with new u0 and p?

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