# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=2

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## [Distinguishing cameras with identical names](https://discourse.julialang.org/t/distinguishing-cameras-with-identical-names/139323)

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**Author:** [@grero](https://discourse.julialang.org/u/grero)\
**Replies:** 1\
**Last updated:** [September 10, 2026, 7:32am UTC](https://discourse.julialang.org/t/distinguishing-cameras-with-identical-names/139323 "2026-09-10T07:32:58Z")

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I have two identical cameras connected to two separate USB-C ports on my MacBook Pro. How do I tell VideoIO which of them to use? julia\> get\_camera\_devices("avfoundation", "\\"\\"") 5-element Vector{String}: "Teslong Cam…

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## [Makie how to conditionaly hide a legend entry in \`axislegend\`](https://discourse.julialang.org/t/makie-how-to-conditionaly-hide-a-legend-entry-in-axislegend/139312)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 2\
**Last updated:** [September 9, 2026, 3:24pm UTC](https://discourse.julialang.org/t/makie-how-to-conditionaly-hide-a-legend-entry-in-axislegend/139312 "2026-09-09T15:24:00Z")

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I have a function that makes the plot on the left: it achieve this via the standard scatter!(xxx; label = "something") infrastructure, after which I call axislegend. I want to use the same plot on the right. On top …

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## [How to use a convolution integral with NeuralPDE.discretize](https://discourse.julialang.org/t/how-to-use-a-convolution-integral-with-neuralpde-discretize/137997)

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**Author:** [@baez-rafael](https://discourse.julialang.org/u/baez-rafael)\
**Replies:** 8\
**Last updated:** [September 9, 2026, 9:53am UTC](https://discourse.julialang.org/t/how-to-use-a-convolution-integral-with-neuralpde-discretize/137997 "2026-09-09T09:53:13Z")

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Hello everyone! I am trying to include the convolution integral \\int\_0^tKr(t -\\tau)\\dot x(\\tau)d\\tau in my equation and I keep coming up with this error when trying to do NeuralPDE.discretize ERROR: KeyError: key :ta…

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## [Simulink alternative in Julia for control engineering](https://discourse.julialang.org/t/simulink-alternative-in-julia-for-control-engineering/131961)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 32\
**Last updated:** [September 8, 2026, 7:05pm UTC](https://discourse.julialang.org/t/simulink-alternative-in-julia-for-control-engineering/131961 "2026-09-08T19:05:27Z")

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In my group, many use Matlab and Simulink for control engineering. It is very easy for them since this his how you learn control engineering, by block diagrams. Regardless of the user interface, what options would I have…

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## [Training a (conditional) Universal Differential Equation using binary observations of a latent state](https://discourse.julialang.org/t/training-a-conditional-universal-differential-equation-using-binary-observations-of-a-latent-state/138431)

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**Author:** [@NCCP](https://discourse.julialang.org/u/NCCP)\
**Replies:** 1\
**Last updated:** [September 5, 2026, 9:49am UTC](https://discourse.julialang.org/t/training-a-conditional-universal-differential-equation-using-binary-observations-of-a-latent-state/138431 "2026-09-05T09:49:40Z")

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Hello everyone, I am training a conditional Universal Differential Equation in Julia. The model is a regular UDE with one additional trainable input parameter for each particle. The neural-network parameters are shared…

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## [Does MTK nominal metadata for variables set abstol when solving ODE](https://discourse.julialang.org/t/does-mtk-nominal-metadata-for-variables-set-abstol-when-solving-ode/139123)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 4\
**Last updated:** [September 4, 2026, 1:33pm UTC](https://discourse.julialang.org/t/does-mtk-nominal-metadata-for-variables-set-abstol-when-solving-ode/139123 "2026-09-04T13:33:06Z")

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when you define a variables @variables begin x(t), \[nominal=1e6\] y(t), \[nominal=1e-3\] end will it essentially do the equivalent of setting abstol to a vector of absolute tolerances rather than a scalar, by multiplying …

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## [Running out of RAM with repeated cholesky solves](https://discourse.julialang.org/t/running-out-of-ram-with-repeated-cholesky-solves/136044)

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**Author:** [@falconflier](https://discourse.julialang.org/u/falconflier)\
**Replies:** 16\
**Last updated:** [September 3, 2026, 8:58am UTC](https://discourse.julialang.org/t/running-out-of-ram-with-repeated-cholesky-solves/136044 "2026-09-03T08:58:43Z")

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Hello, I have a system in which I need to repeatedly solve an electrostatics problem with an evolving charge configuration. When I left my program running overnight, I came back to find that RAM utilization had accumula…

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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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## [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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