# Latest

**URL:** https://discourse.julialang.org/latest.md?page=112

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

**Page:** 113

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## [How to debug incomplete precompilation](https://discourse.julialang.org/t/how-to-debug-incomplete-precompilation/132222)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 12\
**Last updated:** [September 9, 2025, 4:43pm UTC](https://discourse.julialang.org/t/how-to-debug-incomplete-precompilation/132222 "2025-09-09T16:43:20Z")

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I am having a problem that more or less every time I start Julia I run into precompilations that take ages (I can literally have hours each day where Julia is unavailable due to this). When I do using MyPackage I get a …

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## [Autodifferentiation with FFT, with Enzyme?](https://discourse.julialang.org/t/autodifferentiation-with-fft-with-enzyme/128674)

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**Author:** [@jtravs](https://discourse.julialang.org/u/jtravs)\
**Replies:** 13\
**Last updated:** [September 9, 2025, 3:25pm UTC](https://discourse.julialang.org/t/autodifferentiation-with-fft-with-enzyme/128674 "2025-09-09T15:25:34Z")

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Hi, I’m trying to use autodifferentiation (for gradients, jacobians), working with a complex code that uses a lot of array mutation, custom structs, and FFTs (using FFTW). I got a small part of my code working by making…

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## [\[sources\] in Project.toml prior to 1.11](https://discourse.julialang.org/t/sources-in-project-toml-prior-to-1-11/132218)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 2\
**Last updated:** [September 9, 2025, 2:26pm UTC](https://discourse.julialang.org/t/sources-in-project-toml-prior-to-1-11/132218 "2025-09-09T14:26:36Z")

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Just checking: is it OK to have a \[sources\] MainPackage = {path = ".."} in the test/Project.toml of a package prior to the Julia versions which actually support it? My understanding is that those versions will just …

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## [Comparing equivalency of ForwardDiff.Jacobian](https://discourse.julialang.org/t/comparing-equivalency-of-forwarddiff-jacobian/132194)

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**Author:** [@JAY\_SHUKLA](https://discourse.julialang.org/u/JAY_SHUKLA)\
**Replies:** 4\
**Last updated:** [September 9, 2025, 1:08pm UTC](https://discourse.julialang.org/t/comparing-equivalency-of-forwarddiff-jacobian/132194 "2025-09-09T13:08:21Z")

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Hello, I am trying to work on a neural network framework that identifies reaction pathways autonomously and currently trying to add an analysis tool called degree of rate control. I am comparing two approaches where I a…

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## [Revising structs: please test the upcoming Revise](https://discourse.julialang.org/t/revising-structs-please-test-the-upcoming-revise/132226)

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**Author:** [@tim.holy](https://discourse.julialang.org/u/tim.holy)\
**Replies:** 0\
**Last updated:** [September 9, 2025, 10:24am UTC](https://discourse.julialang.org/t/revising-structs-please-test-the-upcoming-revise/132226 "2025-09-09T10:24:57Z")

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Now that Julia 1.12-rc2 is out, I’d like to ask willing volunteers to test it together with a branch of Revise that supports redefining structs and other constants. The core functionality needed to support this feature i…

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## [What does the "?" next to a package name during precompilation mean](https://discourse.julialang.org/t/what-does-the-next-to-a-package-name-during-precompilation-mean/132221)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 2\
**Last updated:** [September 9, 2025, 9:14am UTC](https://discourse.julialang.org/t/what-does-the-next-to-a-package-name-during-precompilation-mean/132221 "2025-09-09T09:14:21Z")

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Figure this probably means something and it is probably something that one should know. When precompiling, sometimes there are “?” next to package name. What exactly do these ones mean? E.g. like hre: Progress \[=====…

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## [Compute Deviance Information Criterion for a Bayesian Model](https://discourse.julialang.org/t/compute-deviance-information-criterion-for-a-bayesian-model/132195)

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**Author:** [@dhruva-ahuja](https://discourse.julialang.org/u/dhruva-ahuja)\
**Replies:** 1\
**Last updated:** [September 9, 2025, 9:05am UTC](https://discourse.julialang.org/t/compute-deviance-information-criterion-for-a-bayesian-model/132195 "2025-09-09T09:05:46Z")

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Hello, I am struggling to compute Deviance Information Criterion (DIC) in Julia as Turing/MCMCDiagnosticTools do not have an implementation of DIC as in R dic.samples(mod2, n.iter=1e3). Backdrop: I am enrolled in a cou…

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## [Do you need to recompile a package when you modify non-src files](https://discourse.julialang.org/t/do-you-need-to-recompile-a-package-when-you-modify-non-src-files/132019)

<div class="topic-metadata">

**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 4\
**Last updated:** [September 9, 2025, 8:53am UTC](https://discourse.julialang.org/t/do-you-need-to-recompile-a-package-when-you-modify-non-src-files/132019 "2025-09-09T08:53:34Z")

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I have problems with packages getting recompiled all the time, and I am trying to debug some of the cases (this has also happened just be restarting Julia, so there are difinitely cases where it does re-precompile when i…

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## [Change location of lsdepot of VS Code](https://discourse.julialang.org/t/change-location-of-lsdepot-of-vs-code/132209)

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**Author:** [@amrods](https://discourse.julialang.org/u/amrods)\
**Replies:** 0\
**Last updated:** [September 9, 2025, 4:32am UTC](https://discourse.julialang.org/t/change-location-of-lsdepot-of-vs-code/132209 "2025-09-09T04:32:41Z")

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My system does not allow me to read this location when using the VS Code extension. Is there a way I can change that location in the settings of the extension? \[ Info: Starting LS with Julia 1.11.6 ERROR: LoadError: Err…

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## [Calling a macro in a function with \`eval\` fails on nightly](https://discourse.julialang.org/t/calling-a-macro-in-a-function-with-eval-fails-on-nightly/132168)

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**Author:** [@danielw2904](https://discourse.julialang.org/u/danielw2904)\
**Replies:** 2\
**Last updated:** [September 9, 2025, 3:49am UTC](https://discourse.julialang.org/t/calling-a-macro-in-a-function-with-eval-fails-on-nightly/132168 "2025-09-09T03:49:23Z")

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Hello, I maintain the package JSONLines.jl package which has some syntactic sugar to define a StructType to read only specific columns. This fails on the Julia nightly with the following error: readcols: Error During T…

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## [Julia v1.12.0-rc2 is now available](https://discourse.julialang.org/t/julia-v1-12-0-rc2-is-now-available/132204)

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**Author:** [@ararslan](https://discourse.julialang.org/u/ararslan)\
**Replies:** 0\
**Last updated:** [September 8, 2025, 11:24pm UTC](https://discourse.julialang.org/t/julia-v1-12-0-rc2-is-now-available/132204 "2025-09-08T23:24:14Z")

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Julia version 1.12.0-rc2, the second release candidate for the upcoming 1.12 series of releases, is now available. Binaries are available via JuliaUp and in the upcoming release section of https://julialang.org/downloads…

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## [Error in program for coupled PDE](https://discourse.julialang.org/t/error-in-program-for-coupled-pde/132200)

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**Author:** [@Reinoud](https://discourse.julialang.org/u/Reinoud)\
**Replies:** 0\
**Last updated:** [September 8, 2025, 9:00pm UTC](https://discourse.julialang.org/t/error-in-program-for-coupled-pde/132200 "2025-09-08T21:00:50Z")

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Hello Could somebody tell me what went wrong? Here the program using OrdinaryDiffEq, ModelingToolkit, MethodOfLines, DomainSets, Plots, Optimization, OptimizationPolyalgorithms, SciMLSensitivity ForwardDiff,JLD2 # Par…

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## [Why is luxor generating 0-byte files?](https://discourse.julialang.org/t/why-is-luxor-generating-0-byte-files/132198)

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**Author:** [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Replies:** 3\
**Last updated:** [September 8, 2025, 8:29pm UTC](https://discourse.julialang.org/t/why-is-luxor-generating-0-byte-files/132198 "2025-09-08T20:29:06Z")

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using Luxor @svg juliacircles(150) 400 400 "test1" @png juliacircles(150) 400 400 "test2" readdir() # file size name 09/08/2025 03:40 PM 0 test1.svg 09/08/2025 03:41 PM …

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## [Julia v1.11.7 testing period](https://discourse.julialang.org/t/julia-v1-11-7-testing-period/132196)

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**Author:** [@dilumaluthge](https://discourse.julialang.org/u/dilumaluthge)\
**Replies:** 0\
**Last updated:** [September 8, 2025, 6:47pm UTC](https://discourse.julialang.org/t/julia-v1-11-7-testing-period/132196 "2025-09-08T18:47:36Z")

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The release-1.11 branch on the Julia repository now contains the set of commits we’re planning to tag as v1.11.7. The list of commits included since v1.11.6 is available here. As a patch release, it should be non-breakin…

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## [Productive Scalable Distributed Task Scheduling Using an MPI-based Backend for Dagger](https://discourse.julialang.org/t/productive-scalable-distributed-task-scheduling-using-an-mpi-based-backend-for-dagger/131995)

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**Author:** [@yanzin00](https://discourse.julialang.org/u/yanzin00)\
**Replies:** 4\
**Last updated:** [September 8, 2025, 4:45pm UTC](https://discourse.julialang.org/t/productive-scalable-distributed-task-scheduling-using-an-mpi-based-backend-for-dagger/131995 "2025-09-08T16:45:56Z")

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Hello Julia Community, especially Dagger and HPC developers. I hope you are doing well this summer and have achieved your goals! I’m here to share: Dagger’s MPI Implementation status My Google Summer of Code at Julia c…

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## [Bifurcation Analysis of large nonlinear system](https://discourse.julialang.org/t/bifurcation-analysis-of-large-nonlinear-system/132184)

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**Author:** [@AlirezaMiraliakbar](https://discourse.julialang.org/u/AlirezaMiraliakbar)\
**Replies:** 4\
**Last updated:** [September 8, 2025, 4:35pm UTC](https://discourse.julialang.org/t/bifurcation-analysis-of-large-nonlinear-system/132184 "2025-09-08T16:35:52Z")

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Hi, I am new to Julia and BifurcationKit. I am trying to perform a bifurcation analysis for a kinetic model I am using to model a chemical plant. The plant’s nonlinear algebraic system of equation is quite large with 67 …

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## [Automatic differentiation of loglikelihood function. Am I doing it right?](https://discourse.julialang.org/t/automatic-differentiation-of-loglikelihood-function-am-i-doing-it-right/132157)

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**Author:** [@giovannitinervia9](https://discourse.julialang.org/u/giovannitinervia9)\
**Replies:** 5\
**Last updated:** [September 8, 2025, 3:56pm UTC](https://discourse.julialang.org/t/automatic-differentiation-of-loglikelihood-function-am-i-doing-it-right/132157 "2025-09-08T15:56:15Z")

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Hi everyone! I’m a statistician and R user taking my first steps with Julia. I have extensive experience with R, and this summer I spent my free time reimplementing the R package gamlss as a personal exercise. Julia has…

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## [Code\_warntype errors on a function](https://discourse.julialang.org/t/code-warntype-errors-on-a-function/132171)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 6\
**Last updated:** [September 8, 2025, 3:24pm UTC](https://discourse.julialang.org/t/code-warntype-errors-on-a-function/132171 "2025-09-08T15:24:21Z")

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I am wondering if the following is a bug, or something I am missing. MWE: struct Foo{T} a::T b::T end function struct2nt(x::T) where T @assert isstructtype(T) N = fieldnames(T) NamedTuple{N}(getfiel…

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## [Optimization on Stiefel manifold with auto-differentiation](https://discourse.julialang.org/t/optimization-on-stiefel-manifold-with-auto-differentiation/132072)

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**Author:** [@Yue-Zhengyuan](https://discourse.julialang.org/u/Yue-Zhengyuan)\
**Replies:** 14\
**Last updated:** [September 8, 2025, 3:06pm UTC](https://discourse.julialang.org/t/optimization-on-stiefel-manifold-with-auto-differentiation/132072 "2025-09-08T15:06:12Z")

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I want to minimize the energy E of some quantum state, which is a real-valued function ultimately depending on a square real orthogonal matrix X (i.e. matrices in the Stiefel manifold). The (Euclidean) gradients of the e…

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## [Change struct dataframe value correct way](https://discourse.julialang.org/t/change-struct-dataframe-value-correct-way/132121)

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**Author:** [@rdl987](https://discourse.julialang.org/u/rdl987)\
**Replies:** 6\
**Last updated:** [September 8, 2025, 3:02pm UTC](https://discourse.julialang.org/t/change-struct-dataframe-value-correct-way/132121 "2025-09-08T15:02:05Z")

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Hello I have a struct with inside other two structs: Base.@kwdef mutable struct MyDataset input::MyInputDataset = MyInputDataset() processed::MyInputDataset = MyInputDataset() end Base.@kwdef mutable struct MyInput…

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## [Help setting a filter that can return missing or non-missing values](https://discourse.julialang.org/t/help-setting-a-filter-that-can-return-missing-or-non-missing-values/132181)

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**Author:** [@Snowy](https://discourse.julialang.org/u/Snowy)\
**Replies:** 4\
**Last updated:** [September 8, 2025, 2:44pm UTC](https://discourse.julialang.org/t/help-setting-a-filter-that-can-return-missing-or-non-missing-values/132181 "2025-09-08T14:44:27Z")

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Hi all, Is there no way to specifically filter for missing values in a DataFrame column that is compatible with filtering for non-missing values (e.g. so a single filter can loop through non-missing and missing?) Take …

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## [JuliaCon 2026: Save the date!](https://discourse.julialang.org/t/juliacon-2026-save-the-date/132172)

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**Author:** [@vchuravy](https://discourse.julialang.org/u/vchuravy)\
**Replies:** 0\
**Last updated:** [September 8, 2025, 10:50am UTC](https://discourse.julialang.org/t/juliacon-2026-save-the-date/132172 "2025-09-08T10:50:55Z")

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We are excited to announce that JuliaCon 2026 will be held at Johannes Gutenberg University in Mainz (Germany, near Frankfurt) from August 10 to August 15, 2026. More details will be shared in due course and announced on…

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## [Best way to deploy Pluto/Jupyterlab for a small class with persistence](https://discourse.julialang.org/t/best-way-to-deploy-pluto-jupyterlab-for-a-small-class-with-persistence/132164)

<div class="topic-metadata">

**Author:** [@cbsteh](https://discourse.julialang.org/u/cbsteh)\
**Replies:** 1\
**Last updated:** [September 8, 2025, 6:18am UTC](https://discourse.julialang.org/t/best-way-to-deploy-pluto-jupyterlab-for-a-small-class-with-persistence/132164 "2025-09-08T06:18:45Z")

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I am a lecturer in agriculture and have developed a crop model written entirely in Julia. I would like to use this model in a course on agriculture and climate change with no more than 20 students. This is not a programm…

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## [Simplifying trigonometric expressions in \`Symbolics\` and \`SymbolicUtils\`](https://discourse.julialang.org/t/simplifying-trigonometric-expressions-in-symbolics-and-symbolicutils/132160)

<div class="topic-metadata">

**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 1\
**Last updated:** [September 7, 2025, 10:33pm UTC](https://discourse.julialang.org/t/simplifying-trigonometric-expressions-in-symbolics-and-symbolicutils/132160 "2025-09-07T22:33:42Z")

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Hi, I am new to Symbolics.jl and trying to verify the following trigonometric expression arising in energy system using the package: \\begin{align\*} v\_k(t) &= \\bar{V} \\cos(\\omega t + \\phi\_k) \\\\ i\_k(t) &=…

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## [Re \`seed!\` ing the RNG at each step of a simulation?](https://discourse.julialang.org/t/re-seed-ing-the-rng-at-each-step-of-a-simulation/132158)

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**Author:** [@nhz2](https://discourse.julialang.org/u/nhz2)\
**Replies:** 4\
**Last updated:** [September 7, 2025, 9:43pm UTC](https://discourse.julialang.org/t/re-seed-ing-the-rng-at-each-step-of-a-simulation/132158 "2025-09-07T21:43:26Z")

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I am running long stochastic simulations that look like: sim\_name = "example/1" Random.seed!(sim\_name) ctx = setup(sim\_name) for frame in 1:1000 ctx = loop(ctx) end I need to be able to restart simulations that crash…

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## [Pluto won't start](https://discourse.julialang.org/t/pluto-wont-start/132131)

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**Author:** [@apchar](https://discourse.julialang.org/u/apchar)\
**Replies:** 6\
**Last updated:** [September 7, 2025, 6:05pm UTC](https://discourse.julialang.org/t/pluto-wont-start/132131 "2025-09-07T18:05:07Z")

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I’m new. Just installed Julia 1.11.6 a few days ago. When I try to start pluto I get a methoderror exception. Ideas?? Kinda discouraging when the recommended platform wont even start. julia\> using Pluto julia\> Pluto.ru…

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## [What type union (\`Union\`) is equivalent to an iterated union (\`UnionAll\`) with a concrete type bound?](https://discourse.julialang.org/t/what-type-union-union-is-equivalent-to-an-iterated-union-unionall-with-a-concrete-type-bound/132140)

<div class="topic-metadata">

**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 5\
**Last updated:** [September 7, 2025, 5:32pm UTC](https://discourse.julialang.org/t/what-type-union-union-is-equivalent-to-an-iterated-union-unionall-with-a-concrete-type-bound/132140 "2025-09-07T17:32:40Z")

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As far as I know and have read, the only subtypes of a concrete type that isn’t DataType are itself and the bottom type Union{}. However, that doesn’t seem to be the case as type parameters: julia\> let T = Vector, P = I…

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## [Trouble with Measurements.jl and Bessel Functions](https://discourse.julialang.org/t/trouble-with-measurements-jl-and-bessel-functions/4562)

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**Author:** [@Jason\_Kilpatrick](https://discourse.julialang.org/u/Jason_Kilpatrick)\
**Replies:** 7\
**Last updated:** [September 7, 2025, 4:02pm UTC](https://discourse.julialang.org/t/trouble-with-measurements-jl-and-bessel-functions/4562 "2025-09-07T16:02:47Z")

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I am using Measurements.jl for error propagation in my code and have come across an error when trying to use it with a Bessel function with a complex input. This works using Measurements x = 1 ± 0.5 y = besselk(1. , x…

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## [Mystery of invalidations in V\>1.10. Even in precompiled code](https://discourse.julialang.org/t/mystery-of-invalidations-in-v-1-10-even-in-precompiled-code/132081)

<div class="topic-metadata">

**Author:** [@joa-quim](https://discourse.julialang.org/u/joa-quim)\
**Replies:** 10\
**Last updated:** [September 7, 2025, 3:42pm UTC](https://discourse.julialang.org/t/mystery-of-invalidations-in-v-1-10-even-in-precompiled-code/132081 "2025-09-07T15:42:15Z")

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I have reported before the very large degradation in TTFP in GMT for version 1.11 and later. One example as reminder | | |\_| | | | (\_| | | Version 1.10.10 (2025-06-27) \_/ |\\\_\_'\_|\_|\_|\\\_\_'\_| | Official https://juli…

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## [What does the parser think this invalid construction means?](https://discourse.julialang.org/t/what-does-the-parser-think-this-invalid-construction-means/132155)

<div class="topic-metadata">

**Author:** [@rcomm](https://discourse.julialang.org/u/rcomm)\
**Replies:** 10\
**Last updated:** [September 7, 2025, 2:00pm UTC](https://discourse.julialang.org/t/what-does-the-parser-think-this-invalid-construction-means/132155 "2025-09-07T14:00:46Z")

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I discovered today that this line: if \<cond expr\>: return true; else return false; end always returns true, whatever the value of x. The behaviour is the same in the REPL and in functions. I admit I thought that the …

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