# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=161

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**Page:** 162

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## [Distributing a job across a cluster with SlurmClusterManager.jl](https://discourse.julialang.org/t/distributing-a-job-across-a-cluster-with-slurmclustermanager-jl/104735)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 2\
**Last updated:** [October 10, 2023, 7:41pm UTC](https://discourse.julialang.org/t/distributing-a-job-across-a-cluster-with-slurmclustermanager-jl/104735 "2023-10-10T19:41:22Z")

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I asked about this on the slack channel, but didn’t get a response. I’ve been using SlurmClusterManager and been pretty satisfied with it, but there’s a job I want to accomplish with it that I’m not sure how to do. The…

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## [MTK components with shared parameters](https://discourse.julialang.org/t/mtk-components-with-shared-parameters/104811)

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**Author:** [@xztt](https://discourse.julialang.org/u/xztt)\
**Replies:** 1\
**Last updated:** [October 10, 2023, 6:22pm UTC](https://discourse.julialang.org/t/mtk-components-with-shared-parameters/104811 "2023-10-10T18:22:52Z")

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I am looking to create a system which allows me to share input parameters, which as a consequence allows me to keep my system parameter space small. I give an MTK example from the standard library but I am also happy to …

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## [Looking for a constrained optimization algorithm](https://discourse.julialang.org/t/looking-for-a-constrained-optimization-algorithm/104799)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 7\
**Last updated:** [October 10, 2023, 1:32pm UTC](https://discourse.julialang.org/t/looking-for-a-constrained-optimization-algorithm/104799 "2023-10-10T13:32:00Z")

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After solving some structural estimation problems in economics with existing tools, I have a more clear idea of the kind of algorithm I am looking for. AFAICT no existing Julia package exists that does everything below —…

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## [Add DICOMTree.jl to JuliaHealth organisation?](https://discourse.julialang.org/t/add-dicomtree-jl-to-juliahealth-organisation/102873)

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**Author:** [@fdekerme](https://discourse.julialang.org/u/fdekerme)\
**Replies:** 2\
**Last updated:** [October 10, 2023, 1:28pm UTC](https://discourse.julialang.org/t/add-dicomtree-jl-to-juliahealth-organisation/102873 "2023-10-10T13:28:54Z")

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Hello ! :grin: Continuing the discussion from \[ANN\] DICOMTree.jl: fdekerme/DICOMTree.jl: A small Julia tool for visualizing DICOM metadata. (github.com) I have recently published a new DICOMTree package which has just…

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## [Interim values of Metaheuristics optimiziers](https://discourse.julialang.org/t/interim-values-of-metaheuristics-optimiziers/104768)

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**Author:** [@jcusick](https://discourse.julialang.org/u/jcusick)\
**Replies:** 3\
**Last updated:** [October 10, 2023, 12:45pm UTC](https://discourse.julialang.org/t/interim-values-of-metaheuristics-optimiziers/104768 "2023-10-10T12:45:31Z")

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I’m interested in getting the interim population values for algorithms within Metaheuristics.jl at each timestep, for example Differential Evolution. I’ve seen examples where the single member of the population with the…

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## [Modeling a leaking tank](https://discourse.julialang.org/t/modeling-a-leaking-tank/104750)

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**Author:** [@lsablon](https://discourse.julialang.org/u/lsablon)\
**Replies:** 5\
**Last updated:** [October 10, 2023, 8:39am UTC](https://discourse.julialang.org/t/modeling-a-leaking-tank/104750 "2023-10-10T08:39:51Z")

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Hello ! I’m currently working on modeling a system that resembles an open-topped tank with a leak, where the tank is also being supplied, so if the leak isn’t sufficient, it overflows. The system’s equations (reasonabl…

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## [Help with a JuMP.jl problem](https://discourse.julialang.org/t/help-with-a-jump-jl-problem/104778)

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**Author:** [@mthelm85](https://discourse.julialang.org/u/mthelm85)\
**Replies:** 1\
**Last updated:** [October 10, 2023, 5:48am UTC](https://discourse.julialang.org/t/help-with-a-jump-jl-problem/104778 "2023-10-10T05:48:52Z")

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The task is fairly straightforward. I need to group the numbers in A into pairs, such that the sum of each pair corresponds to one of the numbers in S. using HiGHS using JuMP m = Model(HiGHS.Optimizer) A = \[ 119 225 5…

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## [On the future of Flux.destructure and SciML integration](https://discourse.julialang.org/t/on-the-future-of-flux-destructure-and-sciml-integration/104760)

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**Author:** [@Bizzi](https://discourse.julialang.org/u/Bizzi)\
**Replies:** 4\
**Last updated:** [October 9, 2023, 8:24pm UTC](https://discourse.julialang.org/t/on-the-future-of-flux-destructure-and-sciml-integration/104760 "2023-10-09T20:24:50Z")

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Due to some technical limitations regarding Lux and coupling layers (1, 2, 3) and the existence of InvertibleNetworks.jl, I have chosen to use Flux for my designs. Still, my long-term objective would be to use Optimizati…

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## [Set parameter dependent time steps using OrdinaryDiffEq](https://discourse.julialang.org/t/set-parameter-dependent-time-steps-using-ordinarydiffeq/104759)

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**Author:** [@henry2004y](https://discourse.julialang.org/u/henry2004y)\
**Replies:** 2\
**Last updated:** [October 9, 2023, 6:09pm UTC](https://discourse.julialang.org/t/set-parameter-dependent-time-steps-using-ordinarydiffeq/104759 "2023-10-09T18:09:24Z")

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Hi, I have a question about how to set time-dependent time steps (or maximum time steps) for solving an ODE. For a quick demo, say we are dealing with this simple ODE: using OrdinaryDiffEq f(u, p, t) = 1.01 \* p \* u u0…

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## [Custom Markershapes in Plots jl](https://discourse.julialang.org/t/custom-markershapes-in-plots-jl/104542)

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**Author:** [@Gattu\_Mytraya](https://discourse.julialang.org/u/Gattu_Mytraya)\
**Replies:** 4\
**Last updated:** [October 4, 2023, 2:39pm UTC](https://discourse.julialang.org/t/custom-markershapes-in-plots-jl/104542 "2023-10-04T14:39:27Z")

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I would like to use custom marker shapes (I hope to import them as SVG files) in scatterplots using Plots jl. How can I do this?

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## [Why does my Flux model return in all NaN?](https://discourse.julialang.org/t/why-does-my-flux-model-return-in-all-nan/104742)

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**Author:** [@tiZ](https://discourse.julialang.org/u/tiZ)\
**Replies:** 2\
**Last updated:** [October 9, 2023, 6:59am UTC](https://discourse.julialang.org/t/why-does-my-flux-model-return-in-all-nan/104742 "2023-10-09T06:59:38Z")

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Hi friends here, I would like to ask a question about the Flux training, and I am try to understand why my model will return NaN value after a failed training step. for example I have such a model, input shape of it is…

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## [Setting up gurobi environment inside a module](https://discourse.julialang.org/t/setting-up-gurobi-environment-inside-a-module/104736)

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**Author:** [@math\_opt](https://discourse.julialang.org/u/math_opt)\
**Replies:** 8\
**Last updated:** [October 9, 2023, 2:22pm UTC](https://discourse.julialang.org/t/setting-up-gurobi-environment-inside-a-module/104736 "2023-10-09T14:22:52Z")

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I have a module that has some functions that run some optimization problems modeling using the JuMP package and the Gurobi solver. a very generic structure of the code is as follows: module TestModule using JuMP using…

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## [\[RFC\] GraphInterface.jl: An interface proposal for Graphs.jl version 2.0](https://discourse.julialang.org/t/rfc-graphinterface-jl-an-interface-proposal-for-graphs-jl-version-2-0/104518)

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**Author:** [@CameronBieganek](https://discourse.julialang.org/u/CameronBieganek)\
**Replies:** 29\
**Last updated:** [October 8, 2023, 10:00pm UTC](https://discourse.julialang.org/t/rfc-graphinterface-jl-an-interface-proposal-for-graphs-jl-version-2-0/104518 "2023-10-08T22:00:07Z")

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Hi, all! I’ve created a new package GraphInterface.jl as a proposal for the new AbstractGraph interface for Graphs.jl version 2.0. I know that there is ongoing work in the GraphsBase.jl repository on the new version 2.0 …

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## [Question about the syntax of the @constraint command](https://discourse.julialang.org/t/question-about-the-syntax-of-the-constraint-command/104700)

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**Author:** [@Artemisa\_Fontinele](https://discourse.julialang.org/u/Artemisa_Fontinele)\
**Replies:** 7\
**Last updated:** [October 8, 2023, 10:18am UTC](https://discourse.julialang.org/t/question-about-the-syntax-of-the-constraint-command/104700 "2023-10-08T10:18:13Z")

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Hey guys! I’ve just started programming in julia and I want to implement two constraints for my code using the JuMP library. The constraints are: for i in 1:N for j in 1:N If sum of Xji == 0 then sum of Xij \>=2 If …

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## [Where is backslash (\\) implemented?](https://discourse.julialang.org/t/where-is-backslash-implemented/104693)

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**Author:** [@SupernovaTitanium](https://discourse.julialang.org/u/SupernovaTitanium)\
**Replies:** 9\
**Last updated:** [October 8, 2023, 8:08am UTC](https://discourse.julialang.org/t/where-is-backslash-implemented/104693 "2023-10-08T08:08:15Z")

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Hi, I’m new to Julia. Recently, I’ve used the backslash (\\) operator to solve a linear system. However, I don’t know how it is implemented. I wanted to know it so I traced the code. I am able to locate to line 1110 at j…

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## [Fixing plot position during an animation for CairoMakie](https://discourse.julialang.org/t/fixing-plot-position-during-an-animation-for-cairomakie/104709)

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**Author:** [@Varun\_V](https://discourse.julialang.org/u/Varun_V)\
**Replies:** 1\
**Last updated:** [October 7, 2023, 9:16pm UTC](https://discourse.julialang.org/t/fixing-plot-position-during-an-animation-for-cairomakie/104709 "2023-10-07T21:16:49Z")

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Hello, I want to animate a series of heatmaps and save it to a video but when I try, the heatmap does not stay in the same place and shakes (its position changes slightly for each frame). Below is code for a minimum wor…

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## [The erros of using RAPOSa(https://raposa.usc.es) based on AmplNLWriter](https://discourse.julialang.org/t/the-erros-of-using-raposa-https-raposa-usc-es-based-on-amplnlwriter/104493)

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**Author:** [@wjulia](https://discourse.julialang.org/u/wjulia)\
**Replies:** 6\
**Last updated:** [October 7, 2023, 12:39pm UTC](https://discourse.julialang.org/t/the-erros-of-using-raposa-https-raposa-usc-es-based-on-amplnlwriter/104493 "2023-10-07T12:39:12Z")

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using JuMP, AmplNLWriter m = Model(() → AmplNLWriter.Optimizer(“raposa”)) @variable(m, 1 \<= x \<= 10 ) @variable(m, 0 \<= y \<= 8 ) @NLobjective(m, Min, x^2 + y^2 + x ) @NLconstraint(m, x\*y \>= 1.0 ) optimize!(m) @sho…

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## [(Insanely-) Higher Order Derivatives](https://discourse.julialang.org/t/insanely-higher-order-derivatives/104455)

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**Author:** [@NitinGupta](https://discourse.julialang.org/u/NitinGupta)\
**Replies:** 36\
**Last updated:** [October 6, 2023, 10:29pm UTC](https://discourse.julialang.org/t/insanely-higher-order-derivatives/104455 "2023-10-06T22:29:58Z")

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What’s the recommended way to obtain insanely high order derivatives of a complex valued (terribly complicated) function in Julia? Presently, I’m using TaylorSeries and it works fantastically. However, I need to compute…

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## ["Switching" out the attached \`Optimizer\` of an (empty) model](https://discourse.julialang.org/t/switching-out-the-attached-optimizer-of-an-empty-model/104633)

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**Author:** [@sstroemer](https://discourse.julialang.org/u/sstroemer)\
**Replies:** 9\
**Last updated:** [October 6, 2023, 5:28pm UTC](https://discourse.julialang.org/t/switching-out-the-attached-optimizer-of-an-empty-model/104633 "2023-10-06T17:28:04Z")

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I’m trying to do the following, in order to “parameterize” a model function make\_parametric!(model::JuMP.Model) if !isempty(model) @error "\[core\] Model must be empty when trying to switch to parametric mode"…

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## [Status of ABC-SMC samplers in Julia](https://discourse.julialang.org/t/status-of-abc-smc-samplers-in-julia/88348)

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**Author:** [@fipelle](https://discourse.julialang.org/u/fipelle)\
**Replies:** 10\
**Last updated:** [October 6, 2023, 4:36pm UTC](https://discourse.julialang.org/t/status-of-abc-smc-samplers-in-julia/88348 "2023-10-06T16:36:51Z")

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Hi, I was wondering what is the current status of ABC samplers in Julia. I have seen that GpABC.jl has a few options, but I was wondering if there are alternative packages with a special focus on SMC. I do not have some…

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## [How to make this custom median for color images faster](https://discourse.julialang.org/t/how-to-make-this-custom-median-for-color-images-faster/104651)

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**Author:** [@Rakesh](https://discourse.julialang.org/u/Rakesh)\
**Replies:** 2\
**Last updated:** [October 6, 2023, 3:47pm UTC](https://discourse.julialang.org/t/how-to-make-this-custom-median-for-color-images-faster/104651 "2023-10-06T15:47:00Z")

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I have made custom median filter for color images, but it performs slow and takes high memory compared to OpenCV.medianBlur. Here is code using ImageIO using FileIO using ImageFiltering using ImageCore # using Statistic…

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## [Writing dataframe to arrow format with column metadata](https://discourse.julialang.org/t/writing-dataframe-to-arrow-format-with-column-metadata/104407)

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**Author:** [@alicepiller](https://discourse.julialang.org/u/alicepiller)\
**Replies:** 6\
**Last updated:** [October 6, 2023, 11:33am UTC](https://discourse.julialang.org/t/writing-dataframe-to-arrow-format-with-column-metadata/104407 "2023-10-06T11:33:08Z")

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I’m trying to write a dataframe to an arrow file and include column metadata. The code below runs, but example\_metadata has none of the metadata. using Arrow using DataFrames df = DataFrame(x = \[1, 2, 3\], y = \[4, 5, 6…

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## [Writing Turing.jl model to avoid loops?](https://discourse.julialang.org/t/writing-turing-jl-model-to-avoid-loops/104593)

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**Author:** [@dleather](https://discourse.julialang.org/u/dleather)\
**Replies:** 2\
**Last updated:** [October 6, 2023, 7:39am UTC](https://discourse.julialang.org/t/writing-turing-jl-model-to-avoid-loops/104593 "2023-10-06T07:39:37Z")

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I’m trying to estimate an 2-dimension Multivariate Ornstein-Uhlenbeck process in Turing.jl using the NUTS algorithm. The solution to this model involves the computation of a matrix exponential. As far as I can deduce, t…

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## [Turing's summary statistics - ESS](https://discourse.julialang.org/t/turings-summary-statistics-ess/103537)

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**Author:** [@PrimulaBunce](https://discourse.julialang.org/u/PrimulaBunce)\
**Replies:** 2\
**Last updated:** [October 6, 2023, 7:35am UTC](https://discourse.julialang.org/t/turings-summary-statistics-ess/103537 "2023-10-06T07:35:31Z")

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Hi, I’m new to MCMC, and I’m using the Turing package to implement NUTS. par\_NUTS = sample(model, NUTS(1000, 0.65), MCMCThreads(), 1000, 3) I’m trying to figure out what the Effective Sample Size (ESS) values returned…

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## [Hot to maintain equal plot sizes of subplot when using e.g. \`legend=:outertop\`?](https://discourse.julialang.org/t/hot-to-maintain-equal-plot-sizes-of-subplot-when-using-e-g-legend-outertop/104637)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 0\
**Last updated:** [October 5, 2023, 11:48pm UTC](https://discourse.julialang.org/t/hot-to-maintain-equal-plot-sizes-of-subplot-when-using-e-g-legend-outertop/104637 "2023-10-05T23:48:29Z")

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MWE: using Plots p1 = plot(x-\>x^2, label = "my curve") plot(x-\>x^1, label = "A curve") plot!(x-\>x^1, label = "Curve 1") plot!(x-\>x^2, label = "Curve 2") plot!(x-\>x^3, label = "Curve 3") plot!(x-\>x^4, label = "Curve 4") …

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## [About Start Values in JuMP - MOA](https://discourse.julialang.org/t/about-start-values-in-jump-moa/104500)

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**Author:** [@rodolforbcoutinho](https://discourse.julialang.org/u/rodolforbcoutinho)\
**Replies:** 6\
**Last updated:** [October 5, 2023, 1:39pm UTC](https://discourse.julialang.org/t/about-start-values-in-jump-moa/104500 "2023-10-05T13:39:54Z")

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Hello to all! I have a doubt about using start values in variables. My hypothesis was that could speed up the execution time if I provide most of the values in variable vector already in optimum position. In my proble…

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## [Inline labeling on line plot (using Plots.jl)](https://discourse.julialang.org/t/inline-labeling-on-line-plot-using-plots-jl/104250)

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**Author:** [@Brent](https://discourse.julialang.org/u/Brent)\
**Replies:** 2\
**Last updated:** [October 5, 2023, 10:27am UTC](https://discourse.julialang.org/t/inline-labeling-on-line-plot-using-plots-jl/104250 "2023-10-05T10:27:11Z")

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Is there a way to do inline labeling (or direct labeling) of lines in a line plot using the Plots.jl package? I’m looking for something similar to the package matplotlib-label-lines for Python. Some examples from the doc…

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## [Easy way to plot a circle given as a vector of vectors (pointwise) as line plot?](https://discourse.julialang.org/t/easy-way-to-plot-a-circle-given-as-a-vector-of-vectors-pointwise-as-line-plot/104574)

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**Author:** [@homocomputeris](https://discourse.julialang.org/u/homocomputeris)\
**Replies:** 15\
**Last updated:** [October 5, 2023, 9:30am UTC](https://discourse.julialang.org/t/easy-way-to-plot-a-circle-given-as-a-vector-of-vectors-pointwise-as-line-plot/104574 "2023-10-05T09:30:15Z")

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Is there an easier way to plot a shape (in geometric sense, not Plots.jl’s) given as a vector of points (i.e. 2D-vectors)? using Plots # approximately a circle vector\_of\_points = \[\[0.708441362115303, 1.413585198669223\]…

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## [Sampling without replacement](https://discourse.julialang.org/t/sampling-without-replacement/1073)

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**Author:** [@SPV](https://discourse.julialang.org/u/SPV)\
**Replies:** 9\
**Last updated:** [October 5, 2023, 5:54am UTC](https://discourse.julialang.org/t/sampling-without-replacement/1073 "2023-10-05T05:54:32Z")

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rand(1:20, 3) gives three random integers in \[1:20\] with replacement. I see there are some threads on github on this issue, but I am not sure what is the recommended way with Julia 0.5 to sample without replacement.

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## [Using SciMLOperators in LinearSolve](https://discourse.julialang.org/t/using-scimloperators-in-linearsolve/104596)

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**Author:** [@j35](https://discourse.julialang.org/u/j35)\
**Replies:** 0\
**Last updated:** [October 4, 2023, 11:52pm UTC](https://discourse.julialang.org/t/using-scimloperators-in-linearsolve/104596 "2023-10-04T23:52:32Z")

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I’m trying to use FunctionOperators from SciMLOperators, to solve a linear problem using matrix free method. But I’m getting wrong result. What am I doing wrong here? Thanks in advance. Here is the MWE. using SparseArr…

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