# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=9

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

**Page:** 10

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## [Makie/Observable: \`@lift\` and type](https://discourse.julialang.org/t/makie-observable-lift-and-type/136597)

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**Author:** [@ryofurue](https://discourse.julialang.org/u/ryofurue)\
**Replies:** 3\
**Last updated:** [April 7, 2026, 4:20pm UTC](https://discourse.julialang.org/t/makie-observable-lift-and-type/136597 "2026-04-07T16:20:01Z")

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Basically, I want to write my plotting functions in such a way that they work whether the arrays to be plotted are Observables or not. This enables me to use my snapshot-producing functions in creating movies. For this…

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## [Package for generalized special functions](https://discourse.julialang.org/t/package-for-generalized-special-functions/67076)

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**Author:** [@amrods](https://discourse.julialang.org/u/amrods)\
**Replies:** 1\
**Last updated:** [April 5, 2026, 9:00pm UTC](https://discourse.julialang.org/t/package-for-generalized-special-functions/67076 "2026-04-05T21:00:57Z")

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Is there any package that implements “generalized” special functions like the Meijer G-function, Fox–Wright Psi-function, Fox H-function? My go to for this kind of needs GSL.jl doesn’t have them.

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## [Vertex Connectivity](https://discourse.julialang.org/t/vertex-connectivity/136573)

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**Author:** [@Pancake](https://discourse.julialang.org/u/Pancake)\
**Replies:** 2\
**Last updated:** [April 5, 2026, 6:17pm UTC](https://discourse.julialang.org/t/vertex-connectivity/136573 "2026-04-05T18:17:42Z")

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Hello Community, I am trying to find a way to calculate Vertex Connectivity, since I did not find a function from Graphs.jl. Unfortunately, I could not find a suitable way to implement it myself, since my background isn’…

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## [Is JuMP.@variable slow when the number gets large?](https://discourse.julialang.org/t/is-jump-variable-slow-when-the-number-gets-large/136430)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 12\
**Last updated:** [April 5, 2026, 12:47am UTC](https://discourse.julialang.org/t/is-jump-variable-slow-when-the-number-gets-large/136430 "2026-04-05T00:47:13Z")

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I have a Unit commitment (24 hours, 5000 scenarios, IEEE118) problem, that has these two lines @time JuMP.@variable(m, pA\[i=\_2(t,T,1), \_0(i,t,S), agi\]) @time JuMP.@variable(m, pf\[i=\_2(t,T,0), \_0(i,t,S), 1:size(F,1)\]) w…

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## [Can I create a null JuMP.VariableRef?](https://discourse.julialang.org/t/can-i-create-a-null-jump-variableref/136492)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 5\
**Last updated:** [April 3, 2026, 1:33am UTC](https://discourse.julialang.org/t/can-i-create-a-null-jump-variableref/136492 "2026-04-03T01:33:50Z")

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I can pre-allocate a JuMP.AffExpr(0.). But can I create a dumb x = JuMP.VariableRef(undef)? Then I can write something like v = JuMP.Containers.@container(\[i=1:3\], x) for i = 1:3 if i !== 3 v\[i\] = JuMP.@var…

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## [How to add a secondary y-axis (right-side axis) for a waterfall plot in Makie?](https://discourse.julialang.org/t/how-to-add-a-secondary-y-axis-right-side-axis-for-a-waterfall-plot-in-makie/136458)

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**Author:** [@arafune](https://discourse.julialang.org/u/arafune)\
**Replies:** 10\
**Last updated:** [April 2, 2026, 4:58am UTC](https://discourse.julialang.org/t/how-to-add-a-secondary-y-axis-right-side-axis-for-a-waterfall-plot-in-makie/136458 "2026-04-02T04:58:06Z")

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Hi everyone, I am trying to create a waterfall plot (stacked line plot) in Makie.jl as shown in the attached image (Fig1.jpg). I already know how to apply offsets to the lines to create the waterfall effect. However, I…

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## [Julia not using the most recent version of Gurobi](https://discourse.julialang.org/t/julia-not-using-the-most-recent-version-of-gurobi/65539)

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**Author:** [@ZHEN\_LIN](https://discourse.julialang.org/u/ZHEN_LIN)\
**Replies:** 10\
**Last updated:** [April 1, 2026, 3:24pm UTC](https://discourse.julialang.org/t/julia-not-using-the-most-recent-version-of-gurobi/65539 "2026-04-01T15:24:38Z")

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I have been using Gurobi 9.0.1 in Julia with JuMP. Now I have installed Gurobi 9.1.2, but the output of Gurobi in Julia indicates that it is still using 9.0.1. How do I make it use the most recent version of Gurobi? I c…

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## [PythonPlot not showing anything](https://discourse.julialang.org/t/pythonplot-not-showing-anything/136478)

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**Author:** [@Ferran\_Mazzanti](https://discourse.julialang.org/u/Ferran_Mazzanti)\
**Replies:** 5\
**Last updated:** [April 1, 2026, 12:39pm UTC](https://discourse.julialang.org/t/pythonplot-not-showing-anything/136478 "2026-04-01T12:39:36Z")

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Hi, I’ve just installed julia 1.12.5 on a new ubuntu box. First thing I tried was to install PythonPlot, and then on the repl using PythonPlot plot(rand(1000),randn(1000)) displays nothing at all. In old Pyplot.jl th…

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## [Interactive line plots in documentation](https://discourse.julialang.org/t/interactive-line-plots-in-documentation/135537)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 9\
**Last updated:** [April 1, 2026, 5:15am UTC](https://discourse.julialang.org/t/interactive-line-plots-in-documentation/135537 "2026-04-01T05:15:16Z")

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What are options for embedding interactive line plots in a Documenter.jl page? I think it has to be some kind of JS. Export HTML with Bokeh.jl and embed it via an iframe. Bokeh.doc\_standalone\_html Export HTML with Plo…

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## [PythonPlot.streamplot error](https://discourse.julialang.org/t/pythonplot-streamplot-error/136365)

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**Author:** [@Wen-Wei\_Tseng](https://discourse.julialang.org/u/Wen-Wei_Tseng)\
**Replies:** 2\
**Last updated:** [March 31, 2026, 8:56am UTC](https://discourse.julialang.org/t/pythonplot-streamplot-error/136365 "2026-03-31T08:56:52Z")

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Hello, I was trying to generate a stream plot using PythonPlot.jl like this example: Julia\_Examples/pyplot\_streamplot.jl at master · gizmaa/Julia\_Examples · GitHub However, I was encounter an error while running the fol…

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## [Setindex! for sparse arrays](https://discourse.julialang.org/t/setindex-for-sparse-arrays/136414)

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**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 5\
**Last updated:** [March 31, 2026, 3:48am UTC](https://discourse.julialang.org/t/setindex-for-sparse-arrays/136414 "2026-03-31T03:48:55Z")

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The question that follows was raised earlier at e.g. performance-enhancement-for-setindex-for-sparse-array. I remain confused regarding the use of sparse(Is,Js,As,\[n,n\]). profview shows that computation time is spend in…

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## [Zygote backward pass creates \`ReshapedArray{Adjoint{CuArray}}\` which cannot be materialized on GPU](https://discourse.julialang.org/t/zygote-backward-pass-creates-reshapedarray-adjoint-cuarray-which-cannot-be-materialized-on-gpu/136450)

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**Author:** [@anscoil](https://discourse.julialang.org/u/anscoil)\
**Replies:** 0\
**Last updated:** [March 29, 2026, 4:55pm UTC](https://discourse.julialang.org/t/zygote-backward-pass-creates-reshapedarray-adjoint-cuarray-which-cannot-be-materialized-on-gpu/136450 "2026-03-29T16:55:48Z")

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Hi, I noticed a problem with Zygote and CUDA when optimizing a loss function containing adjoints of reshaped arrays. Preliminary observation First, note that creating a reshaped array of a CuArray adjoint fails when sc…

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## [Call for Contributors: Probabilistic Programming & Bayesian Inference in ONNX](https://discourse.julialang.org/t/call-for-contributors-probabilistic-programming-bayesian-inference-in-onnx/135380)

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**Author:** [@bparbhu](https://discourse.julialang.org/u/bparbhu)\
**Replies:** 5\
**Last updated:** [March 29, 2026, 2:13pm UTC](https://discourse.julialang.org/t/call-for-contributors-probabilistic-programming-bayesian-inference-in-onnx/135380 "2026-03-29T14:13:37Z")

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Hi everyone, I wanted to share an initiative that’s getting underway within the ONNX ecosystem and invite input and participation from the Julia probabilistic programming community—particularly folks working with Turing…

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## [MadNLP.jl in JuMP](https://discourse.julialang.org/t/madnlp-jl-in-jump/136380)

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**Author:** [@nico](https://discourse.julialang.org/u/nico)\
**Replies:** 2\
**Last updated:** [March 26, 2026, 8:59am UTC](https://discourse.julialang.org/t/madnlp-jl-in-jump/136380 "2026-03-26T08:59:17Z")

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Hi All, I am trying to change some settings in MadNLP.jl when used via JuMP.jl. I would like to change the barrier strategy from the default monotone to adaptive. I just do not manage to change those settings. Does anyon…

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## [Using warmstart using Clp.jl](https://discourse.julialang.org/t/using-warmstart-using-clp-jl/136375)

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**Author:** [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)\
**Replies:** 4\
**Last updated:** [March 26, 2026, 8:35am UTC](https://discourse.julialang.org/t/using-warmstart-using-clp-jl/136375 "2026-03-26T08:35:35Z")

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Hi, Is it possible to accelerate the solution of several similar lp problems by passing the simplex basis using Julia and the Clp.jl package ? Laurent

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## [ApproxFun: Eigenvalue Problem for Linear Differential Algebraic Equations](https://discourse.julialang.org/t/approxfun-eigenvalue-problem-for-linear-differential-algebraic-equations/136369)

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**Author:** [@RayleighLord](https://discourse.julialang.org/u/RayleighLord)\
**Replies:** 7\
**Last updated:** [March 25, 2026, 7:41pm UTC](https://discourse.julialang.org/t/approxfun-eigenvalue-problem-for-linear-differential-algebraic-equations/136369 "2026-03-25T19:41:26Z")

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I want to ask for help and guidance to know if the following problem can be solved using ApproxFun, as I have not encountered any example doing a similar thing. Consider, for instance, a linear system of differential al…

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## [Custom rule for an implicit function in Enzyme](https://discourse.julialang.org/t/custom-rule-for-an-implicit-function-in-enzyme/136259)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 3\
**Last updated:** [March 25, 2026, 12:01pm UTC](https://discourse.julialang.org/t/custom-rule-for-an-implicit-function-in-enzyme/136259 "2026-03-25T12:01:04Z")

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Consider an implicit function y = f(x) defined via g(x, y) where x, y \\in \\mathbb{R}^n. The user supplies f!(y, x) and g!(r, x, y) as callables, which are wrapped in a struct SquareImplicitFunction{F,G} f!::F …

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## [The role of parameter p in the SciML ecosystem](https://discourse.julialang.org/t/the-role-of-parameter-p-in-the-sciml-ecosystem/136363)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 5\
**Last updated:** [March 24, 2026, 9:54pm UTC](https://discourse.julialang.org/t/the-role-of-parameter-p-in-the-sciml-ecosystem/136363 "2026-03-24T21:54:13Z")

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Many (most?) of the SciML libraries feature a parameter p in their high-level API. I would like to learn more about the motivation for this design, and the actual specs for what it can be and what it is intended for. Eg…

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## [Makie Precompilation failed in Linux](https://discourse.julialang.org/t/makie-precompilation-failed-in-linux/136368)

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**Author:** [@henry2004y](https://discourse.julialang.org/u/henry2004y)\
**Replies:** 4\
**Last updated:** [March 24, 2026, 9:28pm UTC](https://discourse.julialang.org/t/makie-precompilation-failed-in-linux/136368 "2026-03-24T21:28:54Z")

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Hi, Starting this morning, when I test my package on Linux that relies on packages with Makie extensions, precompilation fails with the following error messages: Precompiling for configuration --code-coverage=@/home/ru…

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## [ERROR: MethodError: similar(::JuMP.Containers.DenseAxisArray) is ambiguous](https://discourse.julialang.org/t/error-methoderror-similar-jump-containers-denseaxisarray-is-ambiguous/136359)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 1\
**Last updated:** [March 24, 2026, 7:50pm UTC](https://discourse.julialang.org/t/error-methoderror-similar-jump-containers-denseaxisarray-is-ambiguous/136359 "2026-03-24T19:50:31Z")

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I’m on my Windows laptop. And the GLMakie reports an Error. julia\> f = Figure(); julia\> # do some plots to f, without ERROR here, but next: julia\> f Error showing value of type Figure: SYSTEM (REPL): showing an erro…

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## [Change arrow head size in e.g. quiver plots](https://discourse.julialang.org/t/change-arrow-head-size-in-e-g-quiver-plots/109347)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 7\
**Last updated:** [March 24, 2026, 7:10am UTC](https://discourse.julialang.org/t/change-arrow-head-size-in-e-g-quiver-plots/109347 "2026-03-24T07:10:52Z")

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I am trying to make a quiver plot using Plots. Unfortunatley, the heads of the arrows keeps being way to large for the plot to be usable. I have been trying various arguments to change this, but nothing seems to help. H…

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## [SciML FIRK BVP solvers don't pass initial guess to boundary conditions correctly](https://discourse.julialang.org/t/sciml-firk-bvp-solvers-dont-pass-initial-guess-to-boundary-conditions-correctly/136324)

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**Author:** [@ThermionicsGuy](https://discourse.julialang.org/u/ThermionicsGuy)\
**Replies:** 4\
**Last updated:** [March 23, 2026, 10:54pm UTC](https://discourse.julialang.org/t/sciml-firk-bvp-solvers-dont-pass-initial-guess-to-boundary-conditions-correctly/136324 "2026-03-23T22:54:44Z")

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I have a complex non-linear two-point boundary value problem to solve. It’s very sensitive to how close the initial guess is to the final converged answer. I start by solving in a region where convergence is easier, then…

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## [Create a delay element with DelayDiffEq](https://discourse.julialang.org/t/create-a-delay-element-with-delaydiffeq/136349)

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**Author:** [@VPBML](https://discourse.julialang.org/u/VPBML)\
**Replies:** 0\
**Last updated:** [March 23, 2026, 8:09pm UTC](https://discourse.julialang.org/t/create-a-delay-element-with-delaydiffeq/136349 "2026-03-23T20:09:21Z")

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Hi, I am trying to simulate this simple example of a step input signal to a First Order Plus Delay process with ModelingToolkit and DelayDiffEq but it runs into an error. I wonder if it is possible to make this approach…

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## [Break axis in Makie](https://discourse.julialang.org/t/break-axis-in-makie/62729)

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**Author:** [@Elmo](https://discourse.julialang.org/u/Elmo)\
**Replies:** 14\
**Last updated:** [March 23, 2026, 5:46pm UTC](https://discourse.julialang.org/t/break-axis-in-makie/62729 "2026-03-23T17:46:32Z")

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Hi, I am pretty new to Makie, but I am loving the package so far! Is it possible to have a broken y-axis in Makie? E.g. I want to plot: xs1 = randn(10) ys1 = randn(10) xs2 = randn(10) .+ 3 ys2 = randn(10) .+ 10 fig = …

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## [Box shadow in Makie](https://discourse.julialang.org/t/box-shadow-in-makie/136064)

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**Author:** [@klafyvel](https://discourse.julialang.org/u/klafyvel)\
**Replies:** 5\
**Last updated:** [March 23, 2026, 12:01pm UTC](https://discourse.julialang.org/t/box-shadow-in-makie/136064 "2026-03-23T12:01:53Z")

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Hi! I am a big fan of de-marking boxes from their background using box shadows. Is there a way to do that in Makie? Thanks for the help!

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## [Difference in output with change in variable structure](https://discourse.julialang.org/t/difference-in-output-with-change-in-variable-structure/136321)

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**Author:** [@Gagan\_Meena](https://discourse.julialang.org/u/Gagan_Meena)\
**Replies:** 8\
**Last updated:** [March 23, 2026, 8:12am UTC](https://discourse.julialang.org/t/difference-in-output-with-change-in-variable-structure/136321 "2026-03-23T08:12:38Z")

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I am solving a day ahead optimization problem. I am using the same set of variables and constraint and the same objective function in two cases, but I am getting a different outcome. The first case considers a single hyd…

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## [\`dual\_objective\_value\` in JuMP.solution\_summary](https://discourse.julialang.org/t/dual-objective-value-in-jump-solution-summary/134556)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 12\
**Last updated:** [March 23, 2026, 1:06am UTC](https://discourse.julialang.org/t/dual-objective-value-in-jump-solution-summary/134556 "2026-03-23T01:06:09Z")

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I have a question: what is the dual\_objective\_value below julia\> JuMP.solution\_summary(model) solution\_summary(; result = 1, verbose = false) ├ solver\_name : Gurobi ├ Termination │ ├ termination\_status : OPTIMA…

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## [AMDGPU.jl issues](https://discourse.julialang.org/t/amdgpu-jl-issues/136171)

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**Author:** [@jcbritobr](https://discourse.julialang.org/u/jcbritobr)\
**Replies:** 4\
**Last updated:** [March 22, 2026, 6:11pm UTC](https://discourse.julialang.org/t/amdgpu-jl-issues/136171 "2026-03-22T18:11:34Z")

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Hello, good evening. Im having issue to work with amdgpu.jl and ROCM Hip. The issue happens when device = MLDataDevices.AMDGPUDevice() # get device. # Multilayer Perceptron: model = Chain( Dense(2 =\>…

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## [Automatic differentiation of function using \`LinearProblem\`](https://discourse.julialang.org/t/automatic-differentiation-of-function-using-linearproblem/136063)

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**Author:** [@NoFishLikeIan](https://discourse.julialang.org/u/NoFishLikeIan)\
**Replies:** 8\
**Last updated:** [March 22, 2026, 2:08pm UTC](https://discourse.julialang.org/t/automatic-differentiation-of-function-using-linearproblem/136063 "2026-03-22T14:08:42Z")

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I am trying to optimise a function f: \\mathbb{R}^n \\to \\mathbb{R} which internally solves a linear problem, informally something like f(w) = g(x) where x solves A(w) x= b(x). To do this I am using LinearSolve and automa…

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## [On-line storage of MCMC output](https://discourse.julialang.org/t/on-line-storage-of-mcmc-output/136178)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 8\
**Last updated:** [March 21, 2026, 2:27am UTC](https://discourse.julialang.org/t/on-line-storage-of-mcmc-output/136178 "2026-03-21T02:27:57Z")

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I frequently run MCMC for Bayesian estimation which takes a long time (weeks), had a large dimension (10^5–10^6) It would be great to have a means to save the results to disk while in progress, “peek into”…

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