# General Usage

**URL:** https://discourse.julialang.org/c/usage/6.md?page=51

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**Page:** 52

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## [Copyright and license of Julia packages](https://discourse.julialang.org/t/copyright-and-license-of-julia-packages/129598)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 37\
**Last updated:** [July 18, 2025, 3:04am UTC](https://discourse.julialang.org/t/copyright-and-license-of-julia-packages/129598 "2025-07-18T03:04:54Z")

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I see that many Julia packages do not have a license header like “# SPDX-License-Identifier: MIT” in their source files, often also do not have a copyright notice in the README.md file. Example: GitHub - JuliaControl/Co…

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## [False positives when searching documentations](https://discourse.julialang.org/t/false-positives-when-searching-documentations/124793)

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**Author:** [@fgerick](https://discourse.julialang.org/u/fgerick)\
**Replies:** 4\
**Last updated:** [July 18, 2025, 12:35am UTC](https://discourse.julialang.org/t/false-positives-when-searching-documentations/124793 "2025-07-18T00:35:43Z")

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Hi, I have encountered this a few times already (without remembering other references): I just searched for “thread” in the Optimizations.jl documentation, giving two results: However, after clicking on the first pa…

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## [Making Jacobi symbol function faster](https://discourse.julialang.org/t/making-jacobi-symbol-function-faster/122141)

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**Author:** [@Janis\_Erdmanis](https://discourse.julialang.org/u/Janis_Erdmanis)\
**Replies:** 12\
**Last updated:** [July 17, 2025, 7:33pm UTC](https://discourse.julialang.org/t/making-jacobi-symbol-function-faster/122141 "2025-07-17T19:33:52Z")

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After wrapping amazingly fast OpenSSL for group operations (see OpenSSLGroups.jl), I found a new bottleneck for proof of shuffle verification in ShuffleProofs.jl. Half of the time my code now spends computing a Jacobi sy…

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## [Avoid bad parameters in Global Sensitivity Analysis (Morris)](https://discourse.julialang.org/t/avoid-bad-parameters-in-global-sensitivity-analysis-morris/66652)

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**Author:** [@ANasc](https://discourse.julialang.org/u/ANasc)\
**Replies:** 1\
**Last updated:** [July 17, 2025, 6:38pm UTC](https://discourse.julialang.org/t/avoid-bad-parameters-in-global-sensitivity-analysis-morris/66652 "2025-07-17T18:38:10Z")

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Hello, I’m using DiffEqSensitivity to perform a Global Sensitivity Analysis using the Morris method (similar to the first example here: Global Sensitivity Analysis · DifferentialEquations.jl but with a DDEProblem). The …

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## [Makie: Histogram of DateTime values](https://discourse.julialang.org/t/makie-histogram-of-datetime-values/130779)

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**Author:** [@elipivo](https://discourse.julialang.org/u/elipivo)\
**Replies:** 3\
**Last updated:** [July 17, 2025, 3:32pm UTC](https://discourse.julialang.org/t/makie-histogram-of-datetime-values/130779 "2025-07-17T15:32:04Z")

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How can you plot a histogram of datetimes with Makie? There is mention of axis-based unit conversions in the Makie documentation by setting the dim1\_conversion or dim2\_conversion attributes to Makie.DateTimeConversion(),…

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## [Cannot update package (but Pkg claims new version is avaiable)](https://discourse.julialang.org/t/cannot-update-package-but-pkg-claims-new-version-is-avaiable/130807)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 8\
**Last updated:** [July 17, 2025, 1:39pm UTC](https://discourse.julialang.org/t/cannot-update-package-but-pkg-claims-new-version-is-avaiable/130807 "2025-07-17T13:39:29Z")

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I am not super fuzzed about having the latest version of OhMyREPL. However, I kind of would want to know what is going on here. Pkg seems to claim that a new version is available, and that there is nothing stopping me fr…

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## [REPL Save/restore](https://discourse.julialang.org/t/repl-save-restore/130774)

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**Author:** [@benc](https://discourse.julialang.org/u/benc)\
**Replies:** 5\
**Last updated:** [July 17, 2025, 8:44am UTC](https://discourse.julialang.org/t/repl-save-restore/130774 "2025-07-17T08:44:17Z")

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When using the REPL, is it possible to save the state (memory) of the session, and restore it? (State being defined as all datastructures and functions loaded) When prototyping I need to load large-ish datasets, with i…

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## [Automated Execution of Julia using LLMs](https://discourse.julialang.org/t/automated-execution-of-julia-using-llms/130773)

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**Author:** [@compleat](https://discourse.julialang.org/u/compleat)\
**Replies:** 5\
**Last updated:** [July 16, 2025, 11:22pm UTC](https://discourse.julialang.org/t/automated-execution-of-julia-using-llms/130773 "2025-07-16T23:22:21Z")

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I have been using Manus to not only write code (mostly Python) but to run and automatically debug it as well, and produce reports, etc. It can do this easily because it has the most popular languages pre-installed on Ub…

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## [AppleAccelerate mystery](https://discourse.julialang.org/t/appleaccelerate-mystery/130787)

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**Author:** [@ctkelley](https://discourse.julialang.org/u/ctkelley)\
**Replies:** 2\
**Last updated:** [July 16, 2025, 7:54pm UTC](https://discourse.julialang.org/t/appleaccelerate-mystery/130787 "2025-07-16T19:54:02Z")

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When I use AppleAccelerate I’d expect that OpenBLAS would go away, but that is not the case. Is this what I should expect or is something going wrong? Apple Mac Mini, M2 pro, latest OS julia --startup=no …

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## [How to use the PackageCompiler with a private registry](https://discourse.julialang.org/t/how-to-use-the-packagecompiler-with-a-private-registry/130732)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 8\
**Last updated:** [July 16, 2025, 9:52am UTC](https://discourse.julialang.org/t/how-to-use-the-packagecompiler-with-a-private-registry/130732 "2025-07-16T09:52:08Z")

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I have the following structure: ├──App/ ├──compiled/ │ ├── make.jl │ ├── precompile.jl ├──deps/ ├──Project.toml where make.jl is using PackageCompiler PackageCompiler.create\_app( "App", "compiled/App"; …

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## [Plots library throwing error](https://discourse.julialang.org/t/plots-library-throwing-error/130756)

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**Author:** [@Tanya123](https://discourse.julialang.org/u/Tanya123)\
**Replies:** 1\
**Last updated:** [July 15, 2025, 8:42pm UTC](https://discourse.julialang.org/t/plots-library-throwing-error/130756 "2025-07-15T20:42:14Z")

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I am currently working on implementing a particle filter for my 2D model using the BootstrapFilter() function from the ParticleFilter.jl package. As a preliminary step, I was testing the setup on a linear advection model…

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## [Why is my parallelized running time is twice of the single run](https://discourse.julialang.org/t/why-is-my-parallelized-running-time-is-twice-of-the-single-run/130685)

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**Author:** [@Xu\_Shan](https://discourse.julialang.org/u/Xu_Shan)\
**Replies:** 8\
**Last updated:** [July 15, 2025, 6:52pm UTC](https://discourse.julialang.org/t/why-is-my-parallelized-running-time-is-twice-of-the-single-run/130685 "2025-07-15T18:52:25Z")

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Hi Guys, I am running following codes to parallelize my model running for 47 independent sites. In total the parallelization code runs for 120 seconds, but single run only costs 60 seconds…I am wondering why does the pa…

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## [Plea for segfault assistance in PythonCall.jl](https://discourse.julialang.org/t/plea-for-segfault-assistance-in-pythoncall-jl/130697)

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**Author:** [@MilesCranmer](https://discourse.julialang.org/u/MilesCranmer)\
**Replies:** 38\
**Last updated:** [July 15, 2025, 6:46pm UTC](https://discourse.julialang.org/t/plea-for-segfault-assistance-in-pythoncall-jl/130697 "2025-07-15T18:46:32Z")

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Hi all, I was wondering if someone could help us track down a segfault in Julia/PythonCall? It has been hitting us for the past half year in GitHub actions, and has now started to hurt our library’s user base. It has be…

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## [Unreachable reached, v1.11.5: file github issue, or discuss here first?](https://discourse.julialang.org/t/unreachable-reached-v1-11-5-file-github-issue-or-discuss-here-first/130668)

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**Author:** [@DanielSussman](https://discourse.julialang.org/u/DanielSussman)\
**Replies:** 6\
**Last updated:** [July 14, 2025, 11:30pm UTC](https://discourse.julialang.org/t/unreachable-reached-v1-11-5-file-github-issue-or-discuss-here-first/130668 "2025-07-14T23:30:17Z")

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Hi all, Despite (or, in this case, almost certainly because of) being fairly new to using Julia I seemed to have stumbled upon an “unreachable reached” crash. On the one hand, I understand this is cause for celebration,…

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## [Combinatorics.permutations creating a lot of allocations](https://discourse.julialang.org/t/combinatorics-permutations-creating-a-lot-of-allocations/130665)

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**Author:** [@jonbir](https://discourse.julialang.org/u/jonbir)\
**Replies:** 6\
**Last updated:** [July 14, 2025, 9:30pm UTC](https://discourse.julialang.org/t/combinatorics-permutations-creating-a-lot-of-allocations/130665 "2025-07-14T21:30:23Z")

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This is my first post here, so I hope I can explain the problem I’ve come across as I’m writing code for my master thesis in Maths. Compared to others here I’m definitely no expert, but I trusted code from Packages to gi…

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## [Suppress printing methods in a piped script](https://discourse.julialang.org/t/suppress-printing-methods-in-a-piped-script/130698)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 7\
**Last updated:** [July 14, 2025, 2:36pm UTC](https://discourse.julialang.org/t/suppress-printing-methods-in-a-piped-script/130698 "2025-07-14T14:36:53Z")

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I am writing a short script in Julia, which is piped in from an encompassing Bash script. I want to suppress printing of “f (generic function with 1 method)” outputs, as in $ cat \<\<EOF | julia \> foo() = 1 \> EOF foo (gen…

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## [The function \`issuccess\` exists, but no method is defined for this combination of argument types](https://discourse.julialang.org/t/the-function-issuccess-exists-but-no-method-is-defined-for-this-combination-of-argument-types/130707)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 1\
**Last updated:** [July 14, 2025, 4:05pm UTC](https://discourse.julialang.org/t/the-function-issuccess-exists-but-no-method-is-defined-for-this-combination-of-argument-types/130707 "2025-07-14T16:05:03Z")

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I get the following error after updating my packages: The function \`issuccess\` exists, but no method is defined for this combination of argument types Partial stack trace (full stack trace too long and not allowed here…

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## [The issues of frequent recompilation and low computational efficiency in ITensor.jl](https://discourse.julialang.org/t/the-issues-of-frequent-recompilation-and-low-computational-efficiency-in-itensor-jl/130678)

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**Author:** [@Hanze\_Li](https://discourse.julialang.org/u/Hanze_Li)\
**Replies:** 18\
**Last updated:** [July 14, 2025, 3:46pm UTC](https://discourse.julialang.org/t/the-issues-of-frequent-recompilation-and-low-computational-efficiency-in-itensor-jl/130678 "2025-07-14T15:46:24Z")

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I’m a beginner in Julia and I’m using ITensor.jl for computations in my project. However, I’ve noticed that the program runs with very low efficiency, and both CPU and memory usage are minimal. I’m not sure how to optimi…

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## [Juliacall and small binaries?](https://discourse.julialang.org/t/juliacall-and-small-binaries/130704)

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**Author:** [@croberts](https://discourse.julialang.org/u/croberts)\
**Replies:** 2\
**Last updated:** [July 14, 2025, 3:08pm UTC](https://discourse.julialang.org/t/juliacall-and-small-binaries/130704 "2025-07-14T15:08:41Z")

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With the imminent release of v1.12, I’m wondering how small binary compilation might subsequently facilitate Julia integration into non-Julia codebases? Obviously, one could write wrapper packages in \[R\] or Python, whic…

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## [Is there a proper cryptographic implementation for Ed25519 digital signatures?](https://discourse.julialang.org/t/is-there-a-proper-cryptographic-implementation-for-ed25519-digital-signatures/130700)

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**Author:** [@Stephen](https://discourse.julialang.org/u/Stephen)\
**Replies:** 0\
**Last updated:** [July 14, 2025, 1:14pm UTC](https://discourse.julialang.org/t/is-there-a-proper-cryptographic-implementation-for-ed25519-digital-signatures/130700 "2025-07-14T13:14:23Z")

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I have generate the Ed25519 Key Pair for API request on Binance. And here is a Python sample code to show how to sign the payload with an Ed25519 key. #!/usr/bin/env python3 import base64 import requests import time …

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## [Generic implementation of Base.copy method for custom Types (using iternation over fieldnames?)](https://discourse.julialang.org/t/generic-implementation-of-base-copy-method-for-custom-types-using-iternation-over-fieldnames/130696)

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**Author:** [@pierre-haessig](https://discourse.julialang.org/u/pierre-haessig)\
**Replies:** 3\
**Last updated:** [July 14, 2025, 12:55pm UTC](https://discourse.julialang.org/t/generic-implementation-of-base-copy-method-for-custom-types-using-iternation-over-fieldnames/130696 "2025-07-14T12:55:11Z")

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Hello, This question has probably been answered several times, but oddly enough this morning I can’t get the proper answer. Context: I have a code base with several mutable custom parametric types (i.e. structures whic…

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## [Looking for more detailed documentation of \`PlotlyLight.jl\`](https://discourse.julialang.org/t/looking-for-more-detailed-documentation-of-plotlylight-jl/111009)

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**Author:** [@WuSiren](https://discourse.julialang.org/u/WuSiren)\
**Replies:** 4\
**Last updated:** [July 14, 2025, 10:07am UTC](https://discourse.julialang.org/t/looking-for-more-detailed-documentation-of-plotlylight-jl/111009 "2025-07-14T10:07:31Z")

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I found that the PlotlyLight package is very good and very useful to me, but its documentation is currently a bit brief (or I didn’t find it in the right place). Is there any more detailed instructions on its use? Thanks…

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## [How to detect that PackageCompiler fails?](https://discourse.julialang.org/t/how-to-detect-that-packagecompiler-fails/130686)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 3\
**Last updated:** [July 13, 2025, 8:35pm UTC](https://discourse.julialang.org/t/how-to-detect-that-packagecompiler-fails/130686 "2025-07-13T20:35:17Z")

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I am using a Bash script that calls package compiler. In Bash I execute: julia --project -e "include(\\"./test/create\_sys\_image.jl\\");" The create\_sys\_image.jl script contains the line: PackageCompiler.create\_sysimage…

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## [Why is broadcast of getproperty so slow?](https://discourse.julialang.org/t/why-is-broadcast-of-getproperty-so-slow/129970)

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**Author:** [@mwlidar](https://discourse.julialang.org/u/mwlidar)\
**Replies:** 13\
**Last updated:** [July 13, 2025, 5:53pm UTC](https://discourse.julialang.org/t/why-is-broadcast-of-getproperty-so-slow/129970 "2025-07-13T17:53:58Z")

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Looking on the following code I found that a simple broadcast of getproperty is about two to three times slower than a simple for loop implementation: struct MyStruct x::Float64 y::Float64 z::Float64 end #x…

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## [Why is LoopVectorization deprecated?](https://discourse.julialang.org/t/why-is-loopvectorization-deprecated/109547)

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**Author:** [@wujinq](https://discourse.julialang.org/u/wujinq)\
**Replies:** 141\
**Last updated:** [July 13, 2025, 3:58pm UTC](https://discourse.julialang.org/t/why-is-loopvectorization-deprecated/109547 "2025-07-13T15:58:02Z")

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In the README file of JuliaSIMD/LoopVectorization.jl: Macro(s) for vectorizing loops. (github.com) it is clearly stated that the package is deprecated for Julia 1.11 and newer versions, without any explanation. Anyone kn…

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## [Installing Pluto Fails](https://discourse.julialang.org/t/installing-pluto-fails/130681)

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**Author:** [@two\_four\_six](https://discourse.julialang.org/u/two_four_six)\
**Replies:** 6\
**Last updated:** [July 13, 2025, 11:11am UTC](https://discourse.julialang.org/t/installing-pluto-fails/130681 "2025-07-13T11:11:27Z")

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Following the Github ‘Installing Pluto’ recommendation I get this error: julia\> import Pluto │ Attempted to find missing packages in package registries but no registries are installed. └ Use package mode to install a …

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## [Franklin.jl: when Julia scripting with HTML, how can I get its insertions to work?](https://discourse.julialang.org/t/franklin-jl-when-julia-scripting-with-html-how-can-i-get-its-insertions-to-work/130682)

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**Author:** [@fusion809](https://discourse.julialang.org/u/fusion809)\
**Replies:** 2\
**Last updated:** [July 13, 2025, 11:17am UTC](https://discourse.julialang.org/t/franklin-jl-when-julia-scripting-with-html-how-can-i-get-its-insertions-to-work/130682 "2025-07-13T11:17:35Z")

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I have this in my utils.jl file: function resolve\_inserts(html::String)::String insert\_pattern = r"\\{\\{\\s\*insert\\s+(\[a-zA-Z0-9\_./\\-\]+)\\s\*\\}\\}" return replace(html, insert\_pattern =\> s -\> begin filename …

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## [How would I view/use Number Base from 2 to 256](https://discourse.julialang.org/t/how-would-i-view-use-number-base-from-2-to-256/129412)

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**Author:** [@two\_four\_six](https://discourse.julialang.org/u/two_four_six)\
**Replies:** 4\
**Last updated:** [July 13, 2025, 10:47am UTC](https://discourse.julialang.org/t/how-would-i-view-use-number-base-from-2-to-256/129412 "2025-07-13T10:47:14Z")

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Data at rest is binary. When I read a file, it is presented in an output, like print() in hex. Julia converts the binary state of the file and outputs the hex info. This isn’t the behavior I need. I would like to take …

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## [Dealing with geospatial affine transformations](https://discourse.julialang.org/t/dealing-with-geospatial-affine-transformations/130513)

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**Author:** [@technocrat](https://discourse.julialang.org/u/technocrat)\
**Replies:** 9\
**Last updated:** [July 12, 2025, 1:06pm UTC](https://discourse.julialang.org/t/dealing-with-geospatial-affine-transformations/130513 "2025-07-12T13:06:45Z")

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My goal is to produce a map like the attachment, in which the affine adjustments were done in Postgres/PostGIS, within Julia. This is a standard cartographic convention for maps of the United States. The attached ma…

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## [Franklin.jl: iterating over elements of a vector in HTML](https://discourse.julialang.org/t/franklin-jl-iterating-over-elements-of-a-vector-in-html/130644)

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**Author:** [@fusion809](https://discourse.julialang.org/u/fusion809)\
**Replies:** 4\
**Last updated:** [July 12, 2025, 5:41am UTC](https://discourse.julialang.org/t/franklin-jl-iterating-over-elements-of-a-vector-in-html/130644 "2025-07-12T05:41:47Z")

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This is my Franklin.jl-powered website. I have several mathematical simulation pages and while they do differ in some ways, a lot of their code is more or less shared and I am trying to reduce the redundancy between them…

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