# Latest

**URL:** https://discourse.julialang.org/latest.md?page=171

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

**Page:** 172

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## [JuliaCon Local Paris 2025: tickets are open, submit while you can!](https://discourse.julialang.org/t/juliacon-local-paris-2025-tickets-are-open-submit-while-you-can/128751)

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**Author:** [@gdalle](https://discourse.julialang.org/u/gdalle)\
**Replies:** 0\
**Last updated:** [May 6, 2025, 12:25pm UTC](https://discourse.julialang.org/t/juliacon-local-paris-2025-tickets-are-open-submit-while-you-can/128751 "2025-05-06T12:25:32Z")

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Hi everyone! Here are a few good news about JuliaCon Local Paris 2025: Our ticketing platform is now up and running! We have tried to keep tickets affordable, and we’ll offer a few scholarships targeting the attendees…

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## [Cannot open REPL in VSCode or on command line this morning (after long weekend)](https://discourse.julialang.org/t/cannot-open-repl-in-vscode-or-on-command-line-this-morning-after-long-weekend/128749)

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**Author:** [@TimG](https://discourse.julialang.org/u/TimG)\
**Replies:** 3\
**Last updated:** [May 6, 2025, 11:52am UTC](https://discourse.julialang.org/t/cannot-open-repl-in-vscode-or-on-command-line-this-morning-after-long-weekend/128749 "2025-05-06T11:52:12Z")

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Using Alt-J, Alt-O usually opens the REPL in VS-Code. This morning, it generates the below error, which was hard to capture because it disappears a fraction of a second after appearing. If I open a Julia REPL at the com…

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## [Javascript's Module pattern for encapsulation in Julia](https://discourse.julialang.org/t/javascripts-module-pattern-for-encapsulation-in-julia/128729)

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**Author:** [@Gesee](https://discourse.julialang.org/u/Gesee)\
**Replies:** 8\
**Last updated:** [May 6, 2025, 10:12am UTC](https://discourse.julialang.org/t/javascripts-module-pattern-for-encapsulation-in-julia/128729 "2025-05-06T10:12:48Z")

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I have done some JavaScript recently and I discovered the module pattern. Something like this const moduleSecret = (() =\> { let secret = "I'm hidden !"; return { getSecret: () =\> secret, setSecr…

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## [Profile results contains no samples from my code](https://discourse.julialang.org/t/profile-results-contains-no-samples-from-my-code/128630)

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**Author:** [@xor0110](https://discourse.julialang.org/u/xor0110)\
**Replies:** 2\
**Last updated:** [May 6, 2025, 7:52am UTC](https://discourse.julialang.org/t/profile-results-contains-no-samples-from-my-code/128630 "2025-05-06T07:52:25Z")

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I’m trying to profile my code, the analysis takes a minute or so to run with the cpu at 50%. But no matter what I do, running @profile or @profview gives me results that seem to have no samples from my code. For instance…

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## [Simple speed comparison with Matlab](https://discourse.julialang.org/t/simple-speed-comparison-with-matlab/128667)

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**Author:** [@josujugo](https://discourse.julialang.org/u/josujugo)\
**Replies:** 33\
**Last updated:** [May 6, 2025, 6:58am UTC](https://discourse.julialang.org/t/simple-speed-comparison-with-matlab/128667 "2025-05-06T06:58:03Z")

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Hi, Julia experts: I am new using Julia and I want to check differences with Matlab. I have written a simple Matlab example: N=100000 tic for K=\[1:N\] sum(cos(2 \* pi \* \[0:N\]/N) .\* exp(-j \* 2 \* K \* pi/N \* \[0:N\]))/N …

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## [\`rev\_cumsum\_exp!()\` optimization](https://discourse.julialang.org/t/rev-cumsum-exp-optimization/128664)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 12\
**Last updated:** [May 6, 2025, 6:24am UTC](https://discourse.julialang.org/t/rev-cumsum-exp-optimization/128664 "2025-05-06T06:24:16Z")

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Another weird operation to be optimized: function rev\_cumsum\_exp!(A,B,source) # This is equivalent to : # A .= exp(source) # B .= 1 ./ reverse(cumsum(reverse(A)))) s = zero(eltype(A)) fo…

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## [Using standard library modules in packages](https://discourse.julialang.org/t/using-standard-library-modules-in-packages/128719)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 2\
**Last updated:** [May 6, 2025, 1:23am UTC](https://discourse.julialang.org/t/using-standard-library-modules-in-packages/128719 "2025-05-06T01:23:10Z")

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Hello, as result of the stlib excision effort, packages that now (Julia 1.11 ??) want to import a module from the standard library, they need to declare the corresponding package in their Project.toml, right?

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## [How to get the exif tags of a Tiff images using Julia](https://discourse.julialang.org/t/how-to-get-the-exif-tags-of-a-tiff-images-using-julia/128697)

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**Author:** [@Mend-Amar\_Badral](https://discourse.julialang.org/u/Mend-Amar_Badral)\
**Replies:** 4\
**Last updated:** [May 6, 2025, 1:22am UTC](https://discourse.julialang.org/t/how-to-get-the-exif-tags-of-a-tiff-images-using-julia/128697 "2025-05-06T01:22:37Z")

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Hello, I have few drone images and want to read the exif tags. I can do that easily with command line exiftool application but haven’t managed to find a package that reads exif from TIF files. The Exifviewer.jl package o…

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## [ContinuousCallback does not work for backward integration](https://discourse.julialang.org/t/continuouscallback-does-not-work-for-backward-integration/128736)

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**Author:** [@xiaoming](https://discourse.julialang.org/u/xiaoming)\
**Replies:** 2\
**Last updated:** [May 5, 2025, 11:08pm UTC](https://discourse.julialang.org/t/continuouscallback-does-not-work-for-backward-integration/128736 "2025-05-05T23:08:13Z")

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An MME: using StaticArrays, OrdinaryDiffEq f(x, p, t) = SA\[x\[2\], -x\[1\]\] function affect!(integrator) (u0, u1) = integrator.u integrator.u = SA\[u0, -u1\] end function condition(u, t, integrator) u\[1\] end cb = …

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## [Prevent Re-drawing the Same Plot](https://discourse.julialang.org/t/prevent-re-drawing-the-same-plot/128524)

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**Author:** [@luke-pikaart](https://discourse.julialang.org/u/luke-pikaart)\
**Replies:** 1\
**Last updated:** [May 5, 2025, 10:07pm UTC](https://discourse.julialang.org/t/prevent-re-drawing-the-same-plot/128524 "2025-05-05T22:07:29Z")

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I have large pluto notebooks with many plots, they are different analysis’ for engineers to re-use and update when the corresponding designs are updated. My issue is that opening one of these in pluto for the first time…

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## [Deploying docs error - OPENSSL version missmatch](https://discourse.julialang.org/t/deploying-docs-error-openssl-version-missmatch/128734)

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**Author:** [@aris](https://discourse.julialang.org/u/aris)\
**Replies:** 1\
**Last updated:** [May 5, 2025, 8:58pm UTC](https://discourse.julialang.org/t/deploying-docs-error-openssl-version-missmatch/128734 "2025-05-05T20:58:25Z")

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Hello everyone, Until recently, pushing a commit to my package would deploy the documentation without any issues, following these actions. Today, after pushing some changes, I got the following errors: ▶ Build and Depl…

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## [Is there any interest in creating a FEM Julia organization?](https://discourse.julialang.org/t/is-there-any-interest-in-creating-a-fem-julia-organization/7035)

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**Author:** [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)\
**Replies:** 50\
**Last updated:** [September 24, 2019, 7:11am UTC](https://discourse.julialang.org/t/is-there-any-interest-in-creating-a-fem-julia-organization/7035 "2019-09-24T07:11:53Z")

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It appears there are organizations for a number of areas, but not for numerical methods in PDEs. FEM is probably too restrictive, for instance there are some excellent BEM codes on Github. I also know of a FVM code, …

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## [Nested task exception while using Cbc (COIN-OR Branch and Cut) solver inside SDDP.jl](https://discourse.julialang.org/t/nested-task-exception-while-using-cbc-coin-or-branch-and-cut-solver-inside-sddp-jl/128683)

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**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 4\
**Last updated:** [May 5, 2025, 7:17pm UTC](https://discourse.julialang.org/t/nested-task-exception-while-using-cbc-coin-or-branch-and-cut-solver-inside-sddp-jl/128683 "2025-05-05T19:17:40Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem and want to solve the stage-wise problem instances using the Cbc (and other solvers) within the SDDiP algorithm using the S…

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## [How to avoid issue of unstable solution in case of Differential Equation based models](https://discourse.julialang.org/t/how-to-avoid-issue-of-unstable-solution-in-case-of-differential-equation-based-models/128714)

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**Author:** [@Sahil\_Khan](https://discourse.julialang.org/u/Sahil_Khan)\
**Replies:** 5\
**Last updated:** [May 5, 2025, 4:33pm UTC](https://discourse.julialang.org/t/how-to-avoid-issue-of-unstable-solution-in-case-of-differential-equation-based-models/128714 "2025-05-05T16:33:22Z")

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Hello, I was curious that how to approach this problem with unstable solution. I have already tried different solver such as TRBDF2(), Rodas5() , Rosenbrock23() but it didn’t worked. using DifferentialEquations using…

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## [Questions about Cholesky and QR factorizations](https://discourse.julialang.org/t/questions-about-cholesky-and-qr-factorizations/128728)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 1\
**Last updated:** [May 5, 2025, 3:58pm UTC](https://discourse.julialang.org/t/questions-about-cholesky-and-qr-factorizations/128728 "2025-05-05T15:58:14Z")

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I’ve learned that. (But the title of the topic is very general, which is tempting for people to discuss things.) But I find that I cannot perform U \\ UQ (see the 🟠 line) due to ERROR: MethodError: no method matching /…

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## [@threads - control number of threads\`](https://discourse.julialang.org/t/threads-control-number-of-threads/128388)

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**Author:** [@freeman](https://discourse.julialang.org/u/freeman)\
**Replies:** 11\
**Last updated:** [May 5, 2025, 3:18pm UTC](https://discourse.julialang.org/t/threads-control-number-of-threads/128388 "2025-05-05T15:18:06Z")

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There’s another post with the same name \[1\], but I couldn’t get the answer I want out of it despite that it has something marked as “answer” My situation is that I would like to have control over the number of threads u…

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## [Equality of unwrapped unionalls](https://discourse.julialang.org/t/equality-of-unwrapped-unionalls/128716)

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**Author:** [@cshen](https://discourse.julialang.org/u/cshen)\
**Replies:** 3\
**Last updated:** [May 5, 2025, 2:51pm UTC](https://discourse.julialang.org/t/equality-of-unwrapped-unionalls/128716 "2025-05-05T14:51:03Z")

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Say you have the following struct struct MyArr{T,N} arr::Array{T,N} end I was then wondering why the following equality does not hold: unwrap\_arr\_field = fieldtypes(Base.unwrap\_unionall(MyArr))\[1\] unwrap\_arr\_manual …

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## [Gram-Schmidt decomposition](https://discourse.julialang.org/t/gram-schmidt-decomposition/75417)

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**Author:** [@pafloxy](https://discourse.julialang.org/u/pafloxy)\
**Replies:** 16\
**Last updated:** [May 5, 2025, 1:56pm UTC](https://discourse.julialang.org/t/gram-schmidt-decomposition/75417 "2025-05-05T13:56:56Z")

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Hi! Is there any specific module in Julia for performing linear algebra operations like Gram-Schmidt orthogonalization for a given set of vectors?

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## [\[ANN\] Announcing MethodForwarding.jl](https://discourse.julialang.org/t/ann-announcing-methodforwarding-jl/127599)

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**Author:** [@cshen](https://discourse.julialang.org/u/cshen)\
**Replies:** 13\
**Last updated:** [May 5, 2025, 2:29pm UTC](https://discourse.julialang.org/t/ann-announcing-methodforwarding-jl/127599 "2025-05-05T14:29:56Z")

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Hello, I’m announcing AutoForward.jl MethodForwarding.jl(still in the registering 3-day waiting period), which should make composing objects much more hasslefree. It’s a bit what I’ve always wanted @forward from Lazy.j…

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## [Julia Discourse and the Fediverse](https://discourse.julialang.org/t/julia-discourse-and-the-fediverse/128684)

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**Author:** [@stemann](https://discourse.julialang.org/u/stemann)\
**Replies:** 2\
**Last updated:** [May 5, 2025, 1:34pm UTC](https://discourse.julialang.org/t/julia-discourse-and-the-fediverse/128684 "2025-05-05T13:34:14Z")

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It seems it was recently made possible to connect discourse instances to the fediverse - perhaps an idea for improvement: Discourse and the Fediverse! If moderation (effort) is not negatively impacted… - have not dived …

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## [How to license Gurobi inside Google Colab's Julia environment](https://discourse.julialang.org/t/how-to-license-gurobi-inside-google-colabs-julia-environment/128407)

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**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 7\
**Last updated:** [May 5, 2025, 12:50pm UTC](https://discourse.julialang.org/t/how-to-license-gurobi-inside-google-colabs-julia-environment/128407 "2025-05-05T12:50:50Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem and want to solve the stage-wise problem instances using the Gurobi solver within SDDiP algorithm using the SDDP.jl packag…

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## [How to set tolerance attributes of Gurobi inside Google Colab’s Julia environment](https://discourse.julialang.org/t/how-to-set-tolerance-attributes-of-gurobi-inside-google-colab-s-julia-environment/128678)

<div class="topic-metadata">

**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 6\
**Last updated:** [May 5, 2025, 12:47pm UTC](https://discourse.julialang.org/t/how-to-set-tolerance-attributes-of-gurobi-inside-google-colab-s-julia-environment/128678 "2025-05-05T12:47:08Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem and want to solve the stage-wise problem instances using the Gurobi solver within SDDiP algorithm using the SDDP.jl packag…

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## [Is there a way to extract the number of mixed-integer iterations during a particular iteration or solve in the SDDP.jl?](https://discourse.julialang.org/t/is-there-a-way-to-extract-the-number-of-mixed-integer-iterations-during-a-particular-iteration-or-solve-in-the-sddp-jl/128702)

<div class="topic-metadata">

**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 2\
**Last updated:** [May 5, 2025, 12:46pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-extract-the-number-of-mixed-integer-iterations-during-a-particular-iteration-or-solve-in-the-sddp-jl/128702 "2025-05-05T12:46:19Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem and want to solve it using the SDDiP algorithm using the SDDP.jl package in Julia. In this regard, I want to determine th…

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## [Quarto: ipynb to pdf](https://discourse.julialang.org/t/quarto-ipynb-to-pdf/128694)

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**Author:** [@Paul\_Soderlind](https://discourse.julialang.org/u/Paul_Soderlind)\
**Replies:** 3\
**Last updated:** [May 5, 2025, 10:48am UTC](https://discourse.julialang.org/t/quarto-ipynb-to-pdf/128694 "2025-05-05T10:48:13Z")

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I want to convert ipynb notebooks to pdf. They include code (with unicode symbols), latex and plots. On Windows. To make this work, I did the following and I wonder if there is a simpler way: 1. install Quarto, rsvg-con…

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## [Some users are filling up the tmp directory of our lab server with R stuff. Best approach?](https://discourse.julialang.org/t/some-users-are-filling-up-the-tmp-directory-of-our-lab-server-with-r-stuff-best-approach/128705)

<div class="topic-metadata">

**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 1\
**Last updated:** [May 5, 2025, 9:47am UTC](https://discourse.julialang.org/t/some-users-are-filling-up-the-tmp-directory-of-our-lab-server-with-r-stuff-best-approach/128705 "2025-05-05T09:47:59Z")

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(sorry, more R than Julia, but actually pretty general question…) Hello, I manage a “computational server” in our lab (Ubuntu 22.04), and noticed that some users are filling up very quickly the tmp folder with terabytes…

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## [Saving Codim-2 data](https://discourse.julialang.org/t/saving-codim-2-data/128564)

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**Author:** [@iclo3](https://discourse.julialang.org/u/iclo3)\
**Replies:** 2\
**Last updated:** [May 5, 2025, 9:28am UTC](https://discourse.julialang.org/t/saving-codim-2-data/128564 "2025-05-05T09:28:59Z")

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Hi, I want to save the output of my Codim-2 continuation as a csv or txt file. codim2\_a2 = continuation(br, 2, (@optic \_.a2), ContinuationPar(opts\_br, p\_min = 0.0, p\_max = 1000.0, dsmin = 1e-6, max\_steps = 1e8, tol…

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## [Error when running Code on GPU](https://discourse.julialang.org/t/error-when-running-code-on-gpu/128711)

<div class="topic-metadata">

**Author:** [@Efstein](https://discourse.julialang.org/u/Efstein)\
**Replies:** 0\
**Last updated:** [May 5, 2025, 8:47am UTC](https://discourse.julialang.org/t/error-when-running-code-on-gpu/128711 "2025-05-05T08:47:17Z")

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Hi everybody! I am still quite new to Julia, so I hope I’m not missing something obvious. My goal is to solve a system of chemical equations with NeuralPDE. This runs fine, although very slow, on the CPU, but when I try…

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## [Revise type annotations without edits?](https://discourse.julialang.org/t/revise-type-annotations-without-edits/128700)

<div class="topic-metadata">

**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 0\
**Last updated:** [May 5, 2025, 4:16am UTC](https://discourse.julialang.org/t/revise-type-annotations-without-edits/128700 "2025-05-05T04:16:03Z")

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Because of the upcoming world age-partitioned semantics (PR #57253), Revise can pull off type redefinitions by reassigning the const name (Issue #18). Let’s say we start with: julia\> begin struct X{T} x::T end; …

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## [Statically Compiled Julia for (Python) Library Development (at PyData Global 2024) - Jeff Bezanson](https://discourse.julialang.org/t/statically-compiled-julia-for-python-library-development-at-pydata-global-2024-jeff-bezanson/128703)

<div class="topic-metadata">

**Author:** [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Replies:** 0\
**Last updated:** [May 5, 2025, 5:49am UTC](https://discourse.julialang.org/t/statically-compiled-julia-for-python-library-development-at-pydata-global-2024-jeff-bezanson/128703 "2025-05-05T05:49:17Z")

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Statically Compiled Julia for Library Development (at PyData Global 2024) @jeff.bezanson Jeff Bezanson gave a talk about static compilation of Julia for library development at PyData Global 2024 in Decembe…

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## [Missing EXIF data when using ImageMagick.jl](https://discourse.julialang.org/t/missing-exif-data-when-using-imagemagick-jl/92519)

<div class="topic-metadata">

**Author:** [@albrightand](https://discourse.julialang.org/u/albrightand)\
**Replies:** 1\
**Last updated:** [May 5, 2025, 12:22am UTC](https://discourse.julialang.org/t/missing-exif-data-when-using-imagemagick-jl/92519 "2025-05-05T00:22:59Z")

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I’m trying to use ImageMagick.jl to read EXIF GPS data from some .tif files. info = magickinfo(filename) provides a vector of image properties, but the GPS data is not included. When I look at the image properties manua…

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