# Latest

**URL:** https://discourse.julialang.org/latest.md?page=459

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

**Page:** 460

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## [Reshape() permanently locks underlying array (bug?)](https://discourse.julialang.org/t/reshape-permanently-locks-underlying-array-bug/94714)

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**Author:** [@torrance](https://discourse.julialang.org/u/torrance)\
**Replies:** 1\
**Last updated:** [March 13, 2024, 3:37pm UTC](https://discourse.julialang.org/t/reshape-permanently-locks-underlying-array-bug/94714 "2024-03-13T15:37:58Z")

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I want to iteratively build a matrix by first append!(v, col) column vectors to a larger vector v, and then finally resizing to a matrix v2 when I’m finished. Once I’m finished with the matrix v2, I then want to empty!(v…

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## [Dictionarys on the GPU for Agents.jl](https://discourse.julialang.org/t/dictionarys-on-the-gpu-for-agents-jl/111233)

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**Author:** [@Kemper](https://discourse.julialang.org/u/Kemper)\
**Replies:** 4\
**Last updated:** [March 13, 2024, 3:37pm UTC](https://discourse.julialang.org/t/dictionarys-on-the-gpu-for-agents-jl/111233 "2024-03-13T15:37:23Z")

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Hello! I am working on an Agent Based Model with the Agents.jl framework and I am having performance problems. I am working with dictonarys to save positions and values. Is there a way to work with dictonaries on the G…

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## [Internship in Nancy, France (remote working is possible) on developing a package to evaluate the "performances" of different Forest Ecosystems](https://discourse.julialang.org/t/internship-in-nancy-france-remote-working-is-possible-on-developing-a-package-to-evaluate-the-performances-of-different-forest-ecosystems/111574)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 0\
**Last updated:** [March 13, 2024, 12:59pm UTC](https://discourse.julialang.org/t/internship-in-nancy-france-remote-working-is-possible-on-developing-a-package-to-evaluate-the-performances-of-different-forest-ecosystems/111574 "2024-03-13T12:59:33Z")

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Hi… my lab (Bureau d’Economie Théorique et Appliquée - BETA) is offering the following internship/stage for someone to work on a project to evaluate the multidimensional “performance” of different ecosystem services. In…

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## [How to disable the lighting in GLMakie](https://discourse.julialang.org/t/how-to-disable-the-lighting-in-glmakie/111550)

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**Author:** [@xiaoming](https://discourse.julialang.org/u/xiaoming)\
**Replies:** 2\
**Last updated:** [March 13, 2024, 11:54am UTC](https://discourse.julialang.org/t/how-to-disable-the-lighting-in-glmakie/111550 "2024-03-13T11:54:41Z")

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I plot a figure like: How to disable the reverse lighting at those points? The picture is generated by codes like: second(x) = x\[2\] fig = Figure() axes = LScene(fig\[1, 1\]) for i in eachindex(points) scatter!(ax…

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## [How to implement hermite-simpson collocation method?](https://discourse.julialang.org/t/how-to-implement-hermite-simpson-collocation-method/111448)

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**Author:** [@Coral](https://discourse.julialang.org/u/Coral)\
**Replies:** 7\
**Last updated:** [March 13, 2024, 10:55am UTC](https://discourse.julialang.org/t/how-to-implement-hermite-simpson-collocation-method/111448 "2024-03-13T10:55:09Z")

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Hello everyone. I am trying to do a trajectory optimization using Hermite-Simpson collocation method. I want to know if in the package jump or in other package exist a function call hermite-simpson or if i have to creat…

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## [Symbolic Eigenvalues](https://discourse.julialang.org/t/symbolic-eigenvalues/111376)

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**Author:** [@Andy2K11](https://discourse.julialang.org/u/Andy2K11)\
**Replies:** 2\
**Last updated:** [March 13, 2024, 9:26am UTC](https://discourse.julialang.org/t/symbolic-eigenvalues/111376 "2024-03-13T09:26:41Z")

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While completing a course assignment recently I needed to calculate symbolically the eigenvalues of a Jacobian. I was trying to use the Symbolics.jl package but it didn’t seem able to solve this kind of problem. When I …

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## [How to use amsmath/mathtools in Plots.jl?](https://discourse.julialang.org/t/how-to-use-amsmath-mathtools-in-plots-jl/111542)

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**Author:** [@homocomputeris](https://discourse.julialang.org/u/homocomputeris)\
**Replies:** 1\
**Last updated:** [March 13, 2024, 9:12am UTC](https://discourse.julialang.org/t/how-to-use-amsmath-mathtools-in-plots-jl/111542 "2024-03-13T09:12:33Z")

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How can I use amsmath or mathtools commands in Plots.jl? Neither GR + LaTeXStrings.jl nor PGFPlotsX.jl recognize commands like \\lVert A \\rVert

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## [How to increase low speed timeout in Julia?](https://discourse.julialang.org/t/how-to-increase-low-speed-timeout-in-julia/108894)

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**Author:** [@ANANDHU\_SURESH\_B14ME](https://discourse.julialang.org/u/ANANDHU_SURESH_B14ME)\
**Replies:** 1\
**Last updated:** [March 13, 2024, 7:45am UTC](https://discourse.julialang.org/t/how-to-increase-low-speed-timeout-in-julia/108894 "2024-03-13T07:45:00Z")

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I am using a corporate laptop with mcafee client proxy and mcafee DLP endpoint agent. I am getting a timeout error while trying to add packages. I had similiar issue in python while downloading large packages with conda,…

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## [Reorder dictionary keys](https://discourse.julialang.org/t/reorder-dictionary-keys/111547)

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**Author:** [@Sandy45](https://discourse.julialang.org/u/Sandy45)\
**Replies:** 8\
**Last updated:** [March 13, 2024, 6:58am UTC](https://discourse.julialang.org/t/reorder-dictionary-keys/111547 "2024-03-13T06:58:43Z")

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I have dictionary in below format and would like to check if we have any existing methos that can reorder dictionary if we provide the array with the key names in desired order? I would like to see my final dictionary i…

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## [How can i plot a Correlation HeatMap?](https://discourse.julialang.org/t/how-can-i-plot-a-correlation-heatmap/78411)

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**Author:** [@folleyz](https://discourse.julialang.org/u/folleyz)\
**Replies:** 8\
**Last updated:** [March 13, 2024, 6:34am UTC](https://discourse.julialang.org/t/how-can-i-plot-a-correlation-heatmap/78411 "2024-03-13T06:34:52Z")

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Hello Guys! I need a help. i want make this heatmap: I’m trying with that code: Plots.heatmap(cor(Matrix(df\[!,\[:Age,:Balance, :Tenure,:NumOfProducts,:EstimatedSalary\]\])) ) \*\* But how can i put the annotations o…

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## [When we complain of compilation times](https://discourse.julialang.org/t/when-we-complain-of-compilation-times/111549)

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**Author:** [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)\
**Replies:** 2\
**Last updated:** [March 13, 2024, 2:47am UTC](https://discourse.julialang.org/t/when-we-complain-of-compilation-times/111549 "2024-03-13T02:47:27Z")

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… we could compare with some C++ projects. Right now deal.ii has been compiling for more than an hour and the process is at 30%. Edit: two hours later it is at 57%.

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## [\[ANN\] NetworkJumpProcesses.jl - An interface to define JumpProcesses on Graphs](https://discourse.julialang.org/t/ann-networkjumpprocesses-jl-an-interface-to-define-jumpprocesses-on-graphs/111529)

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**Author:** [@TimVWese](https://discourse.julialang.org/u/TimVWese)\
**Replies:** 0\
**Last updated:** [March 12, 2024, 4:28pm UTC](https://discourse.julialang.org/t/ann-networkjumpprocesses-jl-an-interface-to-define-jumpprocesses-on-graphs/111529 "2024-03-12T16:28:36Z")

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I have created NetworkJumpProcesses.jl in order to combine the functionalities of JumpProcesses.jl and Graphs.jl, in a similar fashion to NetworkDynamics.jl. The idea is to define some jumps (discrete state, continuous …

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## [SpecialFunctions.jl's besselk() is ~10X slower than MATLAB's](https://discourse.julialang.org/t/specialfunctions-jls-besselk-is-10x-slower-than-matlabs/111536)

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**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 5\
**Last updated:** [March 12, 2024, 9:04pm UTC](https://discourse.julialang.org/t/specialfunctions-jls-besselk-is-10x-slower-than-matlabs/111536 "2024-03-12T21:04:48Z")

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I find that SpecialFunctions.jl’s besselk() is ~10X slower than MATLAB’s. In MATLAB, \>\> N = 10^6; v = rand(N,1); \>\> tic; for x = v; besselk(1, x); end; toc Elapsed time is 0.017116 seconds. \>\> tic; for x = v; besselk(1…

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## [Revise Fails to Precompile](https://discourse.julialang.org/t/revise-fails-to-precompile/111537)

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**Author:** [@leespen1](https://discourse.julialang.org/u/leespen1)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 8:55pm UTC](https://discourse.julialang.org/t/revise-fails-to-precompile/111537 "2024-03-12T20:55:56Z")

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Somehow revise has stopped precompiling for me. The last thing I can remember doing before this issue cropped up is that I was using Revise alongside Debugger and when I was finished I closed the Julia session. Upon star…

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## [Chairmarks.jl](https://discourse.julialang.org/t/chairmarks-jl/111096)

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**Author:** [@Lilith](https://discourse.julialang.org/u/Lilith)\
**Replies:** 82\
**Last updated:** [March 12, 2024, 7:45pm UTC](https://discourse.julialang.org/t/chairmarks-jl/111096 "2024-03-12T19:45:39Z")

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Hello folks! I’m announcing Chairmarks.jl, version 1.0 (docs). It’s a benchmarking package that aims to be hundreds of times faster than BenchmarkTools without compromising on precision. Usage is pretty similar to Ben…

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## [Problem changing value of a fixed variable in a function](https://discourse.julialang.org/t/problem-changing-value-of-a-fixed-variable-in-a-function/111325)

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**Author:** [@clopen](https://discourse.julialang.org/u/clopen)\
**Replies:** 12\
**Last updated:** [March 12, 2024, 7:04pm UTC](https://discourse.julialang.org/t/problem-changing-value-of-a-fixed-variable-in-a-function/111325 "2024-03-12T19:04:11Z")

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Hello, I am new to programming in Julia and currently working on transitioning code from Fortran to Julia. In a file called codeA.jl, I have declared several variables, some of which are utilized as parameters within a …

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## [Luxor.textformat() missing?](https://discourse.julialang.org/t/luxor-textformat-missing/111535)

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**Author:** [@Julia2001](https://discourse.julialang.org/u/Julia2001)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 6:46pm UTC](https://discourse.julialang.org/t/luxor-textformat-missing/111535 "2024-03-12T18:46:31Z")

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Hi All, I’m experimenting with Luxor and wondering whether Luxor.textformat() has been removed. It’s listed in the examples and the documentation but is missing from the alphabetical list at the end of the documentatio…

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## [Conserve integral in a PINN](https://discourse.julialang.org/t/conserve-integral-in-a-pinn/111496)

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**Author:** [@ste](https://discourse.julialang.org/u/ste)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 6:29pm UTC](https://discourse.julialang.org/t/conserve-integral-in-a-pinn/111496 "2024-03-12T18:29:27Z")

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I have the following code where I try to solve a little toy system of PDEs: using ModelingToolkit, NeuralPDE, Flux, Optim, GalacticOptim, Plots, DiffEqSensitivity, OptimizationOptimisers, OptimizationOptimJL import Mod…

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## [PGFPlots Healpix / Mollweide / Aitoff projections?](https://discourse.julialang.org/t/pgfplots-healpix-mollweide-aitoff-projections/106832)

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**Author:** [@tamasgal](https://discourse.julialang.org/u/tamasgal)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 6:24pm UTC](https://discourse.julialang.org/t/pgfplots-healpix-mollweide-aitoff-projections/106832 "2024-03-12T18:24:41Z")

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I really like PGFPlotsX.jl to create plots which seamlessly integrate into papers but I now I need to make a bunch of Healpix Mollweide projections to visualise data spread on the surface on a sphere (essentially skymaps…

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## [GLM package data normalization and regularization](https://discourse.julialang.org/t/glm-package-data-normalization-and-regularization/111507)

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**Author:** [@Mariana](https://discourse.julialang.org/u/Mariana)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 6:18pm UTC](https://discourse.julialang.org/t/glm-package-data-normalization-and-regularization/111507 "2024-03-12T18:18:37Z")

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Hello! I’m starting to use the GLM.jl package for logistic regression. Does the package adopt any kind of regularization or data normalization by default? I couldn’t find anything related to this in the package documen…

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## [Ylim shifts image in plot](https://discourse.julialang.org/t/ylim-shifts-image-in-plot/111512)

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**Author:** [@parzt](https://discourse.julialang.org/u/parzt)\
**Replies:** 5\
**Last updated:** [March 12, 2024, 5:03pm UTC](https://discourse.julialang.org/t/ylim-shifts-image-in-plot/111512 "2024-03-12T17:03:06Z")

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I’m trying to plot a section of an image file using Plots.jl and then draw in certain points in the image. It works nicely when I plot the whole image: using Plots using FileIO, HTTP, ImageIO bg\_img2 = load(HTTP.URI("h…

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## [Gadfly v1.4.0 documentation](https://discourse.julialang.org/t/gadfly-v1-4-0-documentation/111483)

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**Author:** [@Brinkhuis](https://discourse.julialang.org/u/Brinkhuis)\
**Replies:** 2\
**Last updated:** [March 12, 2024, 4:55pm UTC](https://discourse.julialang.org/t/gadfly-v1-4-0-documentation/111483 "2024-03-12T16:55:00Z")

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I installed Gadfly in a (new) Julia environment. The package manager status command shows it’s version v1.4.0. However, on https://gadflyjl.org/stable the latest version is v1.3.4. Where can I find the v1.4.0 documentati…

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## [How to do literal dispatch?](https://discourse.julialang.org/t/how-to-do-literal-dispatch/111493)

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**Author:** [@putianyi888](https://discourse.julialang.org/u/putianyi888)\
**Replies:** 3\
**Last updated:** [March 12, 2024, 12:48am UTC](https://discourse.julialang.org/t/how-to-do-literal-dispatch/111493 "2024-03-12T00:48:26Z")

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I’d like to make a function dispatch on literal inputs, like how Base.^ dispatches on literal\_pow, but I have no idea how it works. A quick search suggests it’s done by the compiler which means that my goal is not possib…

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## [2024 Julia User & Developer Survey - Draft Open for Comment Until Friday March 29](https://discourse.julialang.org/t/2024-julia-user-developer-survey-draft-open-for-comment-until-friday-march-29/111517)

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**Author:** [@ahclaster](https://discourse.julialang.org/u/ahclaster)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 4:51pm UTC](https://discourse.julialang.org/t/2024-julia-user-developer-survey-draft-open-for-comment-until-friday-march-29/111517 "2024-03-12T16:51:14Z")

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The 2024 Julia User & Developer Survey Draft is open for comments. Please click here to provide comments: 2024 Julia User & Developer Survey - English - Google Docs. Please provide comments no later than Friday March 29.…

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## [Modern Julia Workflows ep. 2 - creating packages](https://discourse.julialang.org/t/modern-julia-workflows-ep-2-creating-packages/110649)

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**Author:** [@gdalle](https://discourse.julialang.org/u/gdalle)\
**Replies:** 3\
**Last updated:** [March 12, 2024, 4:40pm UTC](https://discourse.julialang.org/t/modern-julia-workflows-ep-2-creating-packages/110649 "2024-03-12T16:40:35Z")

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A while back, some friends (@jacobusmmsmit @hill) and I started a blog called Modern Julia Workflows, to reveal the hidden secrets of Julia development. I am pleased to announce that this blog is making progress, and tha…

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## [Zurich Meetup 13 March 2024: Risen from the dead and plotting with Makie](https://discourse.julialang.org/t/zurich-meetup-13-march-2024-risen-from-the-dead-and-plotting-with-makie/109516)

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**Author:** [@mauro3](https://discourse.julialang.org/u/mauro3)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 4:32pm UTC](https://discourse.julialang.org/t/zurich-meetup-13-march-2024-risen-from-the-dead-and-plotting-with-makie/109516 "2024-03-12T16:32:59Z")

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After a long hiatus, we’ll have a Julia user meetup in Zurich again: “Risen from the dead and plotting with Makie” see https://julia-users-zurich.github.io/ for more details.

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## [Integrating network of particles+springs with varying number of particles](https://discourse.julialang.org/t/integrating-network-of-particles-springs-with-varying-number-of-particles/111482)

<div class="topic-metadata">

**Author:** [@70Gage70](https://discourse.julialang.org/u/70Gage70)\
**Replies:** 7\
**Last updated:** [March 12, 2024, 4:06pm UTC](https://discourse.julialang.org/t/integrating-network-of-particles-springs-with-varying-number-of-particles/111482 "2024-03-12T16:06:57Z")

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This is a mwe of code which integrates a network of ~100 - ~1000 interacting particles that can grow and die. In general, the connections are arbitrary and growth/death has logic but here I just connect every particle an…

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## [Fitting hierarchical model with Turing NUTS error](https://discourse.julialang.org/t/fitting-hierarchical-model-with-turing-nuts-error/111527)

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**Author:** [@jpdelong](https://discourse.julialang.org/u/jpdelong)\
**Replies:** 0\
**Last updated:** [March 12, 2024, 3:55pm UTC](https://discourse.julialang.org/t/fitting-hierarchical-model-with-turing-nuts-error/111527 "2024-03-12T15:55:47Z")

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Hi all - I am trying to fit a nonlinear hierarchical model to data using Turing. It works fine without the hierarchical part and it works with the MH sampler, but it fails using HMC and NUTS, with the following errors: E…

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## [Solving 1D heat equation using FFT](https://discourse.julialang.org/t/solving-1d-heat-equation-using-fft/111457)

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**Author:** [@Abdulrhmn\_Ghanem](https://discourse.julialang.org/u/Abdulrhmn_Ghanem)\
**Replies:** 10\
**Last updated:** [March 12, 2024, 3:32pm UTC](https://discourse.julialang.org/t/solving-1d-heat-equation-using-fft/111457 "2024-03-12T15:32:34Z")

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I am trying to reproduce the solution of heat 1D equation solution from https://databookuw.com/. u\_t = \\alpha^2u\_{xx} where u(t,\\ x) is the temperature distribution in time and space. \\mathcal{F}(u(t,\\ x)) = \\hat u(t,…

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## [Interactive Julia plot of a compiled mathematical model](https://discourse.julialang.org/t/interactive-julia-plot-of-a-compiled-mathematical-model/111523)

<div class="topic-metadata">

**Author:** [@Marci93Bio](https://discourse.julialang.org/u/Marci93Bio)\
**Replies:** 1\
**Last updated:** [March 12, 2024, 3:13pm UTC](https://discourse.julialang.org/t/interactive-julia-plot-of-a-compiled-mathematical-model/111523 "2024-03-12T15:13:30Z")

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Hello! I’m having some trouble building an interactive plotting tool for my Julia code. Here’s the problem: I have a mathematical model implemented in Julia. I want to create a tool that plots the state variables and …

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