# Latest

**URL:** https://discourse.julialang.org/latest.md?page=83

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

**Page:** 84

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## [Syntax error in an array expression](https://discourse.julialang.org/t/syntax-error-in-an-array-expression/22607)

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**Author:** [@vvjn](https://discourse.julialang.org/u/vvjn)\
**Replies:** 6\
**Last updated:** [November 18, 2025, 10:19am UTC](https://discourse.julialang.org/t/syntax-error-in-an-array-expression/22607 "2025-11-18T10:19:22Z")

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I ran the following code A = rand(2,3); A\[1, 2 +1 \] and I got this error ERROR: syntax: missing separator in array expression. Same error with i=2; A\[1, i +1\], which is how I came across this. Of course, A\[1,2+1\] works …

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## [Method ambiguity involving diagonal types](https://discourse.julialang.org/t/method-ambiguity-involving-diagonal-types/133907)

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**Author:** [@frankwswang](https://discourse.julialang.org/u/frankwswang)\
**Replies:** 10\
**Last updated:** [November 18, 2025, 8:53am UTC](https://discourse.julialang.org/t/method-ambiguity-involving-diagonal-types/133907 "2025-11-18T08:53:59Z")

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MWE: julia\> f1(argL::T, argR::T) where {T} = 1 f1 (generic function with 1 method) julia\> f1(argL::T1, argR::T2) where {T, T1\<:AbstractArray{T}, T2\<:AbstractArray{T}} = 2 f1 (generic function with 2 methods) julia\> f1…

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## [Fourier transform of a Dual vector](https://discourse.julialang.org/t/fourier-transform-of-a-dual-vector/118538)

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**Author:** [@cdqb](https://discourse.julialang.org/u/cdqb)\
**Replies:** 4\
**Last updated:** [November 18, 2025, 7:46am UTC](https://discourse.julialang.org/t/fourier-transform-of-a-dual-vector/118538 "2025-11-18T07:46:47Z")

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I am trying to Fourier transform a vector of Dual numbers (or rather, ForwardDiff is trying to do that for me as part of a bigger task). However, this does not seem to work with the perhaps most commonly used package FFT…

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## [Scanf Problem](https://discourse.julialang.org/t/scanf-problem/133946)

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**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 2\
**Last updated:** [November 17, 2025, 8:35pm UTC](https://discourse.julialang.org/t/scanf-problem/133946 "2025-11-17T20:35:23Z")

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In trying to read a line and convert it to variables my @scanf statement is giving unexpected (wrong) results. I am wondering if another set of eyes can pick out what I am doing wrong. julia\> using Scanf julia\> record…

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## [Stackoverflow when loading PythonPlot](https://discourse.julialang.org/t/stackoverflow-when-loading-pythonplot/133928)

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**Author:** [@maltee1](https://discourse.julialang.org/u/maltee1)\
**Replies:** 3\
**Last updated:** [November 17, 2025, 5:02pm UTC](https://discourse.julialang.org/t/stackoverflow-when-loading-pythonplot/133928 "2025-11-17T17:02:53Z")

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This seems to be a python problem, but I’ve often had problems with python that could be solved simply be deleting and re-installing the corresponding packages. So I’m thinking this might be related to how Julia uses pyt…

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## [Save a DataFrame preserving a column of matrices](https://discourse.julialang.org/t/save-a-dataframe-preserving-a-column-of-matrices/133895)

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**Author:** [@contradict](https://discourse.julialang.org/u/contradict)\
**Replies:** 4\
**Last updated:** [November 17, 2025, 4:59pm UTC](https://discourse.julialang.org/t/save-a-dataframe-preserving-a-column-of-matrices/133895 "2025-11-17T16:59:02Z")

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I have a DataFrame with a column of 3x3 Float32 matrices. I would like to save this to a file and later read it back, preserving this column. I tried this round trip with several tools: CSV =\> converts to String JSONTab…

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## [Implement C-like command line arguments in Julia](https://discourse.julialang.org/t/implement-c-like-command-line-arguments-in-julia/67816)

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**Author:** [@vinicius\_de\_lima](https://discourse.julialang.org/u/vinicius_de_lima)\
**Replies:** 8\
**Last updated:** [November 17, 2025, 1:07pm UTC](https://discourse.julialang.org/t/implement-c-like-command-line-arguments-in-julia/67816 "2025-11-17T13:07:15Z")

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There is a way to reproduce C command line arguments behavior in Julia? int main(int argc, char \*\*argv) { /\* ... \*/ }

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## [This month in Julia world - 2025-10](https://discourse.julialang.org/t/this-month-in-julia-world-2025-10/133753)

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**Author:** [@Krastanov](https://discourse.julialang.org/u/Krastanov)\
**Replies:** 13\
**Last updated:** [November 17, 2025, 1:00pm UTC](https://discourse.julialang.org/t/this-month-in-julia-world-2025-10/133753 "2025-11-17T13:00:41Z")

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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. For …

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## [PythonPlot instead of PyPlot](https://discourse.julialang.org/t/pythonplot-instead-of-pyplot/133923)

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**Author:** [@sparrowhawk](https://discourse.julialang.org/u/sparrowhawk)\
**Replies:** 0\
**Last updated:** [November 17, 2025, 6:01am UTC](https://discourse.julialang.org/t/pythonplot-instead-of-pyplot/133923 "2025-11-17T06:01:40Z")

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Hi all, I’ve been having trouble with matplotlib dependencies within my package when using PyPlot.jl – most of these errors crop up when there are upstream changes within Conda/matplotlib, that show up during the compil…

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## [Microkinetic simulations yield negative concentrations using Catalyst.jl](https://discourse.julialang.org/t/microkinetic-simulations-yield-negative-concentrations-using-catalyst-jl/133874)

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**Author:** [@lisa-schmoltzi](https://discourse.julialang.org/u/lisa-schmoltzi)\
**Replies:** 9\
**Last updated:** [November 17, 2025, 4:28am UTC](https://discourse.julialang.org/t/microkinetic-simulations-yield-negative-concentrations-using-catalyst-jl/133874 "2025-11-17T04:28:52Z")

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I use Catalyst.jl to model kinetic data of a chemical reaction network. Somehow, for some specific sets of initial concentrations, the resulting time-concentration course results in negative concentrations. Can anyone e…

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## [Keyword arguments not allowed on left-hand side of broadcast assignments?](https://discourse.julialang.org/t/keyword-arguments-not-allowed-on-left-hand-side-of-broadcast-assignments/133920)

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**Author:** [@matthias314](https://discourse.julialang.org/u/matthias314)\
**Replies:** 1\
**Last updated:** [November 17, 2025, 3:18am UTC](https://discourse.julialang.org/t/keyword-arguments-not-allowed-on-left-hand-side-of-broadcast-assignments/133920 "2025-11-17T03:18:44Z")

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Broadcasting with assignment works with a function call on the left-hand side. However, function calls with keyword arguments do not work for some reason: julia\> f(v; a = 0) = copy(v) f (generic function with 1 method) …

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## [Building a JuliaHealth-specific Genie.jl Dashboard](https://discourse.julialang.org/t/building-a-juliahealth-specific-genie-jl-dashboard/133085)

<div class="topic-metadata">

**Author:** [@kosuri-indu](https://discourse.julialang.org/u/kosuri-indu)\
**Replies:** 6\
**Last updated:** [November 16, 2025, 2:17pm UTC](https://discourse.julialang.org/t/building-a-juliahealth-specific-genie-jl-dashboard/133085 "2025-11-16T14:17:31Z")

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Hello everyone! :waving\_hand: I am currently working towards building a JuliaHealth-specific Dashboard using Genie.jl. The main idea is to have one simple, unified interface where users can: Load or connect to health …

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## [Warning: \`Possible method call error\`](https://discourse.julialang.org/t/warning-possible-method-call-error/104917)

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**Author:** [@arturofburgos](https://discourse.julialang.org/u/arturofburgos)\
**Replies:** 5\
**Last updated:** [November 16, 2025, 8:42am UTC](https://discourse.julialang.org/t/warning-possible-method-call-error/104917 "2025-11-16T08:42:29Z")

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Hi, I am new to Julia in the VS Code, does someone know how to get rid of this annoying warning? The code is fully working by the way.

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## [Using Jules (google) for Julia](https://discourse.julialang.org/t/using-jules-google-for-julia/132166)

<div class="topic-metadata">

**Author:** [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)\
**Replies:** 5\
**Last updated:** [November 17, 2025, 11:54am UTC](https://discourse.julialang.org/t/using-jules-google-for-julia/132166 "2025-11-17T11:54:27Z")

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Hi, I have done some experiments with google jules https://jules.google/ (asynchronous coding agent) for Julia development. It is quite impressive and already helped me to code an interactive plotting function with Plot…

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## [@run macro?](https://discourse.julialang.org/t/run-macro/133861)

<div class="topic-metadata">

**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 9\
**Last updated:** [November 16, 2025, 5:42am UTC](https://discourse.julialang.org/t/run-macro/133861 "2025-11-16T05:42:31Z")

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How could a run macro be defined that executes a script? It should just include the file. Would something like: @run myscript.jl be possible as replacement for include("myscript.jl") ? That would save 7 keystrokes …

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## [Wait for a keypress](https://discourse.julialang.org/t/wait-for-a-keypress/20218)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 12\
**Last updated:** [November 15, 2025, 7:13pm UTC](https://discourse.julialang.org/t/wait-for-a-keypress/20218 "2025-11-15T19:13:55Z")

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Absolutely stupid question - and yes RTFM. How do I make a Julia program pause until a key is pressed?

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## [Linear Algebra Manipulations with Cholesky Factors](https://discourse.julialang.org/t/linear-algebra-manipulations-with-cholesky-factors/133899)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 1\
**Last updated:** [November 15, 2025, 6:51pm UTC](https://discourse.julialang.org/t/linear-algebra-manipulations-with-cholesky-factors/133899 "2025-11-15T18:51:20Z")

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I’m working on a problem where I need to do some Gaussian random variable sampling, which would naive be implemented as: nx = 10 e = ones(nx) A = spdiagm(-1 =\> -e\[1:end-1\], 0 =\> 2e, 1 =\> -e\[1:end-1\]) chol = cholesky(A, …

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## [Cursor movement package](https://discourse.julialang.org/t/cursor-movement-package/133902)

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**Author:** [@TheLateKronos](https://discourse.julialang.org/u/TheLateKronos)\
**Replies:** 1\
**Last updated:** [November 15, 2025, 5:59pm UTC](https://discourse.julialang.org/t/cursor-movement-package/133902 "2025-11-15T17:59:29Z")

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A while back I got really into making a program with a terminal based UI, and therefore wanted some solid foundational building blocks for working with the terminal. Moving the cursor is the first, saving and restoring t…

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## [Avoiding kronecker in optimization](https://discourse.julialang.org/t/avoiding-kronecker-in-optimization/133879)

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**Author:** [@fibrebundl](https://discourse.julialang.org/u/fibrebundl)\
**Replies:** 7\
**Last updated:** [November 15, 2025, 2:53pm UTC](https://discourse.julialang.org/t/avoiding-kronecker-in-optimization/133879 "2025-11-15T14:53:03Z")

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I have a scalar valued function whose gradient and hessian I can compute. However, the hessian involves a kronecker product. I’ve been using the Optim.jl package for optimization. Is there an efficient way of passing the…

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## [How can I know the position for each label in the plot](https://discourse.julialang.org/t/how-can-i-know-the-position-for-each-label-in-the-plot/133884)

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**Author:** [@Lucca\_Da\_Paz](https://discourse.julialang.org/u/Lucca_Da_Paz)\
**Replies:** 1\
**Last updated:** [November 15, 2025, 7:25am UTC](https://discourse.julialang.org/t/how-can-i-know-the-position-for-each-label-in-the-plot/133884 "2025-11-15T07:25:11Z")

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How can I know the position in the x-axis for each label in my violin(x, y, group = x, linewidth=1, dpi = 300) boxplot!(x, y, fillalpha=0.4, fillcolor = colorant"gray", linecolor=:black, linewidth=1, legend=false, dpi = …

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## [Execute Function for each Julia Thread](https://discourse.julialang.org/t/execute-function-for-each-julia-thread/133889)

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**Author:** [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)\
**Replies:** 6\
**Last updated:** [November 15, 2025, 7:02am UTC](https://discourse.julialang.org/t/execute-function-for-each-julia-thread/133889 "2025-11-15T07:02:36Z")

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I have an external library which requires thread local resources to function. For every thread Julia creates, it must notify this library via an initialize\_thread\_local() function. Is there a way to run this code for eac…

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## [Automatically enable GC during JIT compile](https://discourse.julialang.org/t/automatically-enable-gc-during-jit-compile/133894)

<div class="topic-metadata">

**Author:** [@csvance](https://discourse.julialang.org/u/csvance)\
**Replies:** 2\
**Last updated:** [November 15, 2025, 12:19am UTC](https://discourse.julialang.org/t/automatically-enable-gc-during-jit-compile/133894 "2025-11-15T00:19:39Z")

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To get the best performance for my Julia RPC server in production, I turn off GC during the execution of each request and manually call the GC after returning the response. Each Julia RPC server process only handles one …

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## [Startup time of 1000 packages – 53% slower in Julia 1.12 vs 1.10](https://discourse.julialang.org/t/startup-time-of-1000-packages-53-slower-in-julia-1-12-vs-1-10/128343)

<div class="topic-metadata">

**Author:** [@fonsp](https://discourse.julialang.org/u/fonsp)\
**Replies:** 81\
**Last updated:** [November 14, 2025, 7:28pm UTC](https://discourse.julialang.org/t/startup-time-of-1000-packages-53-slower-in-julia-1-12-vs-1-10/128343 "2025-11-14T19:28:21Z")

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Startup time of 1000 packages I think startup time is a big deal for Julia, especially for new users. If it takes a long time to load a package, it makes Julia look bad. Recently, Julia 1.12 beta was released, and I not…

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## [I don't understand reducing over empty iterators](https://discourse.julialang.org/t/i-dont-understand-reducing-over-empty-iterators/133870)

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**Author:** [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)\
**Replies:** 5\
**Last updated:** [November 14, 2025, 7:24pm UTC](https://discourse.julialang.org/t/i-dont-understand-reducing-over-empty-iterators/133870 "2025-11-14T19:24:36Z")

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Consider the following example where I get this error even though I provide init julia\> foo(x, y, a\_set) = x - sum(y\[i\] for i in a\_set, init = zero(eltype(y))) foo (generic function with 1 method) julia\> foo(3, ones(4)…

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## [Pluto doesn't find some modules](https://discourse.julialang.org/t/pluto-doesnt-find-some-modules/133840)

<div class="topic-metadata">

**Author:** [@trg818](https://discourse.julialang.org/u/trg818)\
**Replies:** 6\
**Last updated:** [November 14, 2025, 4:27pm UTC](https://discourse.julialang.org/t/pluto-doesnt-find-some-modules/133840 "2025-11-14T16:27:57Z")

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Why does Pluto not seem to find self-written modules I keep in a directory ~/lib/julia when that directory is included via a file .julia/config/startup.jl and when they are found by Jupyter notebooks and by the REPL? Wh…

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## [Two PhD positions in nonlinear/complex systems, clouds, and climate](https://discourse.julialang.org/t/two-phd-positions-in-nonlinear-complex-systems-clouds-and-climate/133878)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 0\
**Last updated:** [November 14, 2025, 3:18pm UTC](https://discourse.julialang.org/t/two-phd-positions-in-nonlinear-complex-systems-clouds-and-climate/133878 "2025-11-14T15:18:43Z")

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Hi all, I’d like to announce two open PhD positions for which I am the lead supervisor. Both would be fully with Julia, and both would be contributing partly to the development of new features for DynamicalSystems.jl an…

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## [Internship Opportunity: Scientific Product Development with Julia at PumasAI](https://discourse.julialang.org/t/internship-opportunity-scientific-product-development-with-julia-at-pumasai/133876)

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**Author:** [@andreasnoack](https://discourse.julialang.org/u/andreasnoack)\
**Replies:** 0\
**Last updated:** [November 14, 2025, 2:03pm UTC](https://discourse.julialang.org/t/internship-opportunity-scientific-product-development-with-julia-at-pumasai/133876 "2025-11-14T14:03:28Z")

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Are you passionate about scientific computing and eager to apply your skills in real-world pharmacology and data analysis? Our Product Development team is looking for an energetic intern to join us in 2026! What You’ll …

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## [Global Base.PROGRAM\_FILE does not exist](https://discourse.julialang.org/t/global-base-program-file-does-not-exist/133875)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 1\
**Last updated:** [November 14, 2025, 12:30pm UTC](https://discourse.julialang.org/t/global-base-program-file-does-not-exist/133875 "2025-11-14T12:30:58Z")

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I compiled an App using package compiler for v1.12.1 and run it using docker. I got this obscure error: fatal: error thrown and no exception handler available. ErrorException("Global Base.PROGRAM\_FILE does not exist and…

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## [ForwardDiff.jl with FFTW.jl](https://discourse.julialang.org/t/forwarddiff-jl-with-fftw-jl/97366)

<div class="topic-metadata">

**Author:** [@Bill\_Holmes](https://discourse.julialang.org/u/Bill_Holmes)\
**Replies:** 5\
**Last updated:** [November 14, 2025, 8:15am UTC](https://discourse.julialang.org/t/forwarddiff-jl-with-fftw-jl/97366 "2025-11-14T08:15:54Z")

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Hello all. I am working with ForwardDiff.jl on a problem that requires computing kernel density estimates (and thus convolutions which boils down to FFT). I am searching for a way to do this using autodifferentation. I r…

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## [JuliaHealth JuliaCon Proceedings Paper: Request for Feedback](https://discourse.julialang.org/t/juliahealth-juliacon-proceedings-paper-request-for-feedback/133862)

<div class="topic-metadata">

**Author:** [@TheCedarPrince](https://discourse.julialang.org/u/TheCedarPrince)\
**Replies:** 1\
**Last updated:** [November 14, 2025, 7:58am UTC](https://discourse.julialang.org/t/juliahealth-juliacon-proceedings-paper-request-for-feedback/133862 "2025-11-14T07:58:48Z")

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Hi folks! :waving\_hand: We (Carlos Castillo Passi, Div Goyal, Kosuri Lakshmi Indu, Jay Sanjay, and Jakub Mitura) have finished the final draft of the JuliaHealth JuliaCon Proceedings Paper: Overleaf, Online LaTeX Editor …

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