# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=1

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**Page:** 2

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## [HDF5.jl with vector of tuples of strings](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148)

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**Author:** [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Replies:** 4\
**Last updated:** [September 2, 2026, 7:25am UTC](https://discourse.julialang.org/t/hdf5-jl-with-vector-of-tuples-of-strings/139148 "2026-09-02T07:25:32Z")

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@mkitti I just stumbled on another similar string related issue. If one tries to write a Vector{@NamedTuple...} where at least one type is a string, the writing fails. This is on v0.17.3. using HDF5 arr = \[ (;A…

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## [Two Microsimulation Models in Julia](https://discourse.julialang.org/t/two-microsimulation-models-in-julia/139140)

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**Author:** [@grahamstark](https://discourse.julialang.org/u/grahamstark)\
**Replies:** 0\
**Last updated:** [September 1, 2026, 3:07pm UTC](https://discourse.julialang.org/t/two-microsimulation-models-in-julia/139140 "2026-09-01T15:07:59Z")

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If you’re interested in public policy or economics, you might be interested in some Julia microsimulations I’ve been working on: https://sims.virtual-worlds.scot:8444/scotben-2026/ https://sims.virtual-worlds.scot:8444…

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## [Manually update operator in a SplitODEProblem](https://discourse.julialang.org/t/manually-update-operator-in-a-splitodeproblem/139138)

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**Author:** [@homocarbonis](https://discourse.julialang.org/u/homocarbonis)\
**Replies:** 1\
**Last updated:** [September 1, 2026, 3:00pm UTC](https://discourse.julialang.org/t/manually-update-operator-in-a-splitodeproblem/139138 "2026-09-01T15:00:46Z")

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Hello, I have some library code which constructs a SplitODEProblem with a DiagonalOperator as f1, and I’m trying to write a function to remake the problem with problem.f.f1.A updated according to new parameter values. I…

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## [Optimization convergence requirements](https://discourse.julialang.org/t/optimization-convergence-requirements/139122)

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**Author:** [@dgagnon](https://discourse.julialang.org/u/dgagnon)\
**Replies:** 5\
**Last updated:** [September 1, 2026, 10:23am UTC](https://discourse.julialang.org/t/optimization-convergence-requirements/139122 "2026-09-01T10:23:47Z")

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Hello I have a function from \[0,1\] to \[0,1\], which I can shown to always have a unique maximum. I have been using Optim.jl with the default Brent’s method to compute it. I am a statistician, not a specialist on numeric…

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## [Sparse vector in imfilter kernel](https://discourse.julialang.org/t/sparse-vector-in-imfilter-kernel/139133)

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**Author:** [@xor0110](https://discourse.julialang.org/u/xor0110)\
**Replies:** 0\
**Last updated:** [September 1, 2026, 7:00am UTC](https://discourse.julialang.org/t/sparse-vector-in-imfilter-kernel/139133 "2026-09-01T07:00:33Z")

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What would it take to make ImageFiltering.imfilter work with sparse or “dilated” kernels? I know it supports OffsetArrays, for instance. We basically need to skip every few values so a filter like \[-1,0,0,0,1\] only perfo…

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## [How do you get formulas created by XLSX.jl to be read automatically in Excel?](https://discourse.julialang.org/t/how-do-you-get-formulas-created-by-xlsx-jl-to-be-read-automatically-in-excel/75701)

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**Author:** [@scotts](https://discourse.julialang.org/u/scotts)\
**Replies:** 3\
**Last updated:** [August 29, 2026, 5:46pm UTC](https://discourse.julialang.org/t/how-do-you-get-formulas-created-by-xlsx-jl-to-be-read-automatically-in-excel/75701 "2026-08-29T17:46:34Z")

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I’m making Excel files with XLSX.jl. Everything works as it should, however, I’ve found when I create formulas for the spreadsheet they just show up as text in Excel. I can manually get them to register and process if …

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## [Generate excel spreadsheet from julia equations?](https://discourse.julialang.org/t/generate-excel-spreadsheet-from-julia-equations/92444)

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**Author:** [@OliverEvans96](https://discourse.julialang.org/u/OliverEvans96)\
**Replies:** 1\
**Last updated:** [August 29, 2026, 5:43pm UTC](https://discourse.julialang.org/t/generate-excel-spreadsheet-from-julia-equations/92444 "2026-08-29T17:43:11Z")

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Hi all, Imagine a spreadsheet with columns A, B, C. Suppose A are observations, and B = B(A), C = C(A, B) are defined by excel formulas involving the previous columns. This is a pretty common scenario in excel. I was j…

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## [\[RFC\] Using a major version bump for syntax opt-in](https://discourse.julialang.org/t/rfc-using-a-major-version-bump-for-syntax-opt-in/139080)

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**Author:** [@BeastyBlacksmith](https://discourse.julialang.org/u/BeastyBlacksmith)\
**Replies:** 0\
**Last updated:** [August 28, 2026, 8:49am UTC](https://discourse.julialang.org/t/rfc-using-a-major-version-bump-for-syntax-opt-in/139080 "2026-08-28T08:49:26Z")

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Hello everyone, I wanted to gather some opinions on whether my thinking in Let recipes read attributes without hard-coding canonical names - Pull Request #5786 - JuliaPlots/Plots.jl - GitHub is a good thing to do or not…

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## [Designing high pass filters with remez from DSP](https://discourse.julialang.org/t/designing-high-pass-filters-with-remez-from-dsp/139064)

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**Author:** [@Miroboru](https://discourse.julialang.org/u/Miroboru)\
**Replies:** 2\
**Last updated:** [August 27, 2026, 12:01pm UTC](https://discourse.julialang.org/t/designing-high-pass-filters-with-remez-from-dsp/139064 "2026-08-27T12:01:16Z")

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When using the remez function from DSP to design high pass filters, the result is not what I expect. Here is an MWE (1.12.7 plus latest DSP): using DSP h = remez(32, \[(0.0, 0.2) =\> 0.0, (0.3, 0.5) =\> 1.0\]) h\_obj = Poly…

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## [Can I create a small, interactive web site on Github](https://discourse.julialang.org/t/can-i-create-a-small-interactive-web-site-on-github/138992)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 19\
**Last updated:** [August 25, 2026, 9:41pm UTC](https://discourse.julialang.org/t/can-i-create-a-small-interactive-web-site-on-github/138992 "2026-08-25T21:41:32Z")

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I was reading that there are now multiple options to create WebAssembly with Julia. Can I host a website with WebAssembly on GitHub? I just want a simple site with a table and some interactivity, like applying a filter …

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## [Triangulate.jl - Generating a triangle grid using Triangulate](https://discourse.julialang.org/t/triangulate-jl-generating-a-triangle-grid-using-triangulate/139023)

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**Author:** [@omgplshelp](https://discourse.julialang.org/u/omgplshelp)\
**Replies:** 3\
**Last updated:** [August 25, 2026, 3:26pm UTC](https://discourse.julialang.org/t/triangulate-jl-generating-a-triangle-grid-using-triangulate/139023 "2026-08-25T15:26:59Z")

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Hi, I’m trying to generate an unstructured triangle grid using Triangulate.jl with coordinate data specifying layer boundaries and measuring points within those boundaries. I’ve tried just about every bit of example cod…

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## [Striped Colors for e.g. bar plots in Julia](https://discourse.julialang.org/t/striped-colors-for-e-g-bar-plots-in-julia/64435)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 8\
**Last updated:** [August 24, 2026, 9:27am UTC](https://discourse.julialang.org/t/striped-colors-for-e-g-bar-plots-in-julia/64435 "2026-08-24T09:27:01Z")

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This is an image of a figure a friend made (in matlab), would it be possible to create a similar effect in Julia where the colour is striped (instead of monocolour)? (in this case the stipes helps show that the 4th ba…

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## [Interested in maintaining PlotlyLight.jl — looking for repository admin](https://discourse.julialang.org/t/interested-in-maintaining-plotlylight-jl-looking-for-repository-admin/138983)

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**Author:** [@karei](https://discourse.julialang.org/u/karei)\
**Replies:** 3\
**Last updated:** [August 23, 2026, 12:38am UTC](https://discourse.julialang.org/t/interested-in-maintaining-plotlylight-jl-looking-for-repository-admin/138983 "2026-08-23T00:38:59Z")

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Hi all, I’m a heavy user of PlotlyLight.jl, but I noticed that the package hasn’t been updated for about nine months. Plotly.js upstream is now at v3.7.0, while PlotlyLight.jl still bundles Plotly.js v3.3.0, which means…

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## [What's all the current development of MTK currently going on related to?](https://discourse.julialang.org/t/whats-all-the-current-development-of-mtk-currently-going-on-related-to/138286)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 30\
**Last updated:** [August 20, 2026, 3:30pm UTC](https://discourse.julialang.org/t/whats-all-the-current-development-of-mtk-currently-going-on-related-to/138286 "2026-08-20T15:30:40Z")

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I’m seeing a whole lot of commits and minor version increases the past week or two. It seems like a lot of it is internal reworking / refactoring. Just curious to know what it’s all about

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## [State of Audio DSP & Feature Extraction in Julia: Gaps, Priorities, and Future Directions](https://discourse.julialang.org/t/state-of-audio-dsp-feature-extraction-in-julia-gaps-priorities-and-future-directions/138722)

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**Author:** [@blah\_blah.jl](https://discourse.julialang.org/u/blah_blah.jl)\
**Replies:** 51\
**Last updated:** [August 20, 2026, 3:24pm UTC](https://discourse.julialang.org/t/state-of-audio-dsp-feature-extraction-in-julia-gaps-priorities-and-future-directions/138722 "2026-08-20T15:24:15Z")

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Hey everyone, ​I’ve been exploring signal processing in Julia and working on some basic DSP and communications tools. As I look into expanding toward audio signal processing, Music Information Retrieval (MIR), and featu…

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## [Space-time FEM for elastic wave propagation — no time stepping](https://discourse.julialang.org/t/space-time-fem-for-elastic-wave-propagation-no-time-stepping/138901)

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**Author:** [@perebalazs](https://discourse.julialang.org/u/perebalazs)\
**Replies:** 5\
**Last updated:** [August 20, 2026, 1:18pm UTC](https://discourse.julialang.org/t/space-time-fem-for-elastic-wave-propagation-no-time-stepping/138901 "2026-08-20T13:18:31Z")

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I have been experimenting with a simple space-time finite element formulation for 1D elastodynamics, and I thought the example might be interesting for the Numerics category. The problem is an elastic bar immediately af…

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## [Modelling fiber lasers in Julia as a BVDAE problem](https://discourse.julialang.org/t/modelling-fiber-lasers-in-julia-as-a-bvdae-problem/138925)

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**Author:** [@mich](https://discourse.julialang.org/u/mich)\
**Replies:** 0\
**Last updated:** [August 19, 2026, 10:16am UTC](https://discourse.julialang.org/t/modelling-fiber-lasers-in-julia-as-a-bvdae-problem/138925 "2026-08-19T10:16:50Z")

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Hello, I am trying to model a fiber laser using Julia. I’ve managed to simulate an amplifier which is an initial value DAE problem, now i need to extend the code to a BVDAE problem to handle different laser resonator ar…

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## [Understanding jump model preparation cost](https://discourse.julialang.org/t/understanding-jump-model-preparation-cost/138472)

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**Author:** [@lmshk](https://discourse.julialang.org/u/lmshk)\
**Replies:** 18\
**Last updated:** [August 18, 2026, 3:57pm UTC](https://discourse.julialang.org/t/understanding-jump-model-preparation-cost/138472 "2026-08-18T15:57:19Z")

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I am using Catalyst.jl to make JumpProblems of around 160k species and a fairly sparse interaction structure that includes what JumpProcesses.jl calls “constant-rate jump” (CRJ) reactions. This works, but JumpProblem con…

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## [Is there a Julia equivalent of MATLAB’s rcosdesign?](https://discourse.julialang.org/t/is-there-a-julia-equivalent-of-matlab-s-rcosdesign/138352)

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**Author:** [@blah\_blah.jl](https://discourse.julialang.org/u/blah_blah.jl)\
**Replies:** 7\
**Last updated:** [August 18, 2026, 12:52pm UTC](https://discourse.julialang.org/t/is-there-a-julia-equivalent-of-matlab-s-rcosdesign/138352 "2026-08-18T12:52:28Z")

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I’m porting a QPSK simulation from MATLAB to Julia and need a root-raised-cosine filter. MATLAB provides: rrc\_filter = rcosdesign(beta, span, samples\_per\_symbol, "sqrt"); I checked DSP.jl, but rcosdesign does not appe…

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## [MTK SDDE ArgumentError when Connecting two Components](https://discourse.julialang.org/t/mtk-sdde-argumenterror-when-connecting-two-components/138861)

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**Author:** [@bebrunn](https://discourse.julialang.org/u/bebrunn)\
**Replies:** 7\
**Last updated:** [August 18, 2026, 11:38am UTC](https://discourse.julialang.org/t/mtk-sdde-argumenterror-when-connecting-two-components/138861 "2026-08-18T11:38:45Z")

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Hi, I am trying to connect two MTK components and then solve the resulting SDDE system. However, I am getting an ArgumentsError that I don’t understand. using ModelingToolkit using DifferentialEquations using ModelingT…

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## [I got bored and built a 2x2 MIMO FxNLMS ANC simulator in Julia + C23](https://discourse.julialang.org/t/i-got-bored-and-built-a-2x2-mimo-fxnlms-anc-simulator-in-julia-c23/138826)

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**Author:** [@blah\_blah.jl](https://discourse.julialang.org/u/blah_blah.jl)\
**Replies:** 0\
**Last updated:** [August 15, 2026, 1:42pm UTC](https://discourse.julialang.org/t/i-got-bored-and-built-a-2x2-mimo-fxnlms-anc-simulator-in-julia-c23/138826 "2026-08-15T13:42:43Z")

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Hey folks, Today morning was aggressively boring, so naturally I ended up building a 2x2 MIMO active noise control simulator. I have recently started poking around the border between DSP and control systems, and for so…

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## [Exporting TuringGLM code](https://discourse.julialang.org/t/exporting-turingglm-code/110738)

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**Author:** [@Sam\_P](https://discourse.julialang.org/u/Sam_P)\
**Replies:** 2\
**Last updated:** [August 15, 2026, 7:43am UTC](https://discourse.julialang.org/t/exporting-turingglm-code/110738 "2026-08-15T07:43:48Z")

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Hi all - R and cmdstan user here trying his hands on Julia and Turing. Came across TuringGLM and I like its smooth interface akin to what brms is to RStan. I do want to learn the raw Turing code though, and was wonderi…

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## [Analysis on result of \`AbstractMCMC.sample\`](https://discourse.julialang.org/t/analysis-on-result-of-abstractmcmc-sample/138793)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 0\
**Last updated:** [August 13, 2026, 9:43pm UTC](https://discourse.julialang.org/t/analysis-on-result-of-abstractmcmc-sample/138793 "2026-08-13T21:43:17Z")

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Hi, I have 2 questions. Say I’m using the MALA sampler from AdvancedMH.jl, I think the following is the easiest way to compute the acceptance %, is that correct or is there some other method? Second question is regarding…

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## [Connection between BFGS and ROOT.Minuit. Stopping criteria](https://discourse.julialang.org/t/connection-between-bfgs-and-root-minuit-stopping-criteria/48729)

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**Author:** [@misha\_mikhasenko](https://discourse.julialang.org/u/misha_mikhasenko)\
**Replies:** 9\
**Last updated:** [August 11, 2026, 8:00am UTC](https://discourse.julialang.org/t/connection-between-bfgs-and-root-minuit-stopping-criteria/48729 "2026-08-11T08:00:01Z")

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Dear experts on optimization problems, I am trying to establish a connection between the common tools in High Energy Physics (HEP) and Julia ecosystem. In HEP, the main tool for optimization is Minuit library. Nowadays…

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## [Likelihood model in Bayesian NODE](https://discourse.julialang.org/t/likelihood-model-in-bayesian-node/138664)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 2\
**Last updated:** [August 10, 2026, 10:39pm UTC](https://discourse.julialang.org/t/likelihood-model-in-bayesian-node/138664 "2026-08-10T22:39:21Z")

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Hi all, I’m reading Uncertainty Quantified Deep Bayesian Model Discovery · Overview of Julia's SciML. to play around with Bayesian NODEs. I noticed the loss function which actually gets passed to AdvancedHMC’s samplers i…

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## [Julia stability vs Rust for Scientific Computing](https://discourse.julialang.org/t/julia-stability-vs-rust-for-scientific-computing/137094)

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**Author:** [@gunner](https://discourse.julialang.org/u/gunner)\
**Replies:** 43\
**Last updated:** [August 10, 2026, 12:33pm UTC](https://discourse.julialang.org/t/julia-stability-vs-rust-for-scientific-computing/137094 "2026-08-10T12:33:08Z")

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Hi everyone! I’ve been seriously considering investing time into Julia for scientific computing and operations research, and I genuinely want it to succeed: the promise of high-level syntax with near-C performance is inc…

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## [Convolutions does not work on CUDA](https://discourse.julialang.org/t/convolutions-does-not-work-on-cuda/138703)

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**Author:** [@Matej\_Zorek](https://discourse.julialang.org/u/Matej_Zorek)\
**Replies:** 0\
**Last updated:** [August 9, 2026, 12:49pm UTC](https://discourse.julialang.org/t/convolutions-does-not-work-on-cuda/138703 "2026-08-09T12:49:18Z")

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Hi, I have a problem with Convolutional layers on gpu. It simply does not work. I have installed CUDA and cuDNN. GPU works for “simple” layers like Dense, LayerNorm etc, but when i try evaluate Conv it gives me an error…

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## [\[ANN\]Introducing RRCFilters.jl — a small Julia toolkit for digital communications](https://discourse.julialang.org/t/ann-introducing-rrcfilters-jl-a-small-julia-toolkit-for-digital-communications/138700)

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**Author:** [@blah\_blah.jl](https://discourse.julialang.org/u/blah_blah.jl)\
**Replies:** 0\
**Last updated:** [August 9, 2026, 7:52am UTC](https://discourse.julialang.org/t/ann-introducing-rrcfilters-jl-a-small-julia-toolkit-for-digital-communications/138700 "2026-08-09T07:52:38Z")

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Hey everyone! I recently published my first Julia DSP and digital-communications package: Somewhat embarrassingly, this project began with a slightly petty amount of spite toward MATLAB. I wanted to implement the commu…

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## [Online hackathon (Aug 2026): composing differentiable simulation pipelines](https://discourse.julialang.org/t/online-hackathon-aug-2026-composing-differentiable-simulation-pipelines/138669)

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**Author:** [@dionhaefner](https://discourse.julialang.org/u/dionhaefner)\
**Replies:** 2\
**Last updated:** [August 8, 2026, 9:08am UTC](https://discourse.julialang.org/t/online-hackathon-aug-2026-composing-differentiable-simulation-pipelines/138669 "2026-08-08T09:08:11Z")

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Hi there! I work at Pasteur Labs on Tesseract, an open-source tool for wrapping simulation components so they compose into end-to-end differentiable pipelines (w/ some existing Julia examples via juliacall). We’re runni…

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## [Ipopt has trouble with \`Vector{AffExpr} in MOI.Zeros\`](https://discourse.julialang.org/t/ipopt-has-trouble-with-vector-affexpr-in-moi-zeros/138395)

<div class="topic-metadata">

**Author:** [@bernardofpc](https://discourse.julialang.org/u/bernardofpc)\
**Replies:** 10\
**Last updated:** [August 8, 2026, 8:30am UTC](https://discourse.julialang.org/t/ipopt-has-trouble-with-vector-affexpr-in-moi-zeros/138395 "2026-08-08T08:30:50Z")

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I have a JuMP model where solving with HiGHS and Ipopt results in different objective\_values. A JuMP Model ├ solver: Ipopt ├ objective\_sense: MIN\_SENSE │ └ objective\_function\_type: AffExpr ├ num\_variables: 54 ├ num\_cons…

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