# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=17

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**Page:** 18

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## [Failing to obtain a bifurcation plot](https://discourse.julialang.org/t/failing-to-obtain-a-bifurcation-plot/134330)

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**Author:** [@vembha](https://discourse.julialang.org/u/vembha)\
**Replies:** 0\
**Last updated:** [December 3, 2025, 3:47pm UTC](https://discourse.julialang.org/t/failing-to-obtain-a-bifurcation-plot/134330 "2025-12-03T15:47:51Z")

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Hello everyone, A long-time user of Julia/SciML. I have a system of ODEs and have been trying to obtain a bifurcation diagram using BifurcationKit.jl and ModelingToolkit.jl. While I am able to successfully obtain one br…

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## [How to evaluate a function y = f(x) for x in Interval defined by Domainset?](https://discourse.julialang.org/t/how-to-evaluate-a-function-y-f-x-for-x-in-interval-defined-by-domainset/134300)

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**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 4\
**Last updated:** [December 3, 2025, 7:57am UTC](https://discourse.julialang.org/t/how-to-evaluate-a-function-y-f-x-for-x-in-interval-defined-by-domainset/134300 "2025-12-03T07:57:21Z")

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How to evaluate a function y = f(x) for x in an interval defined by IntervalSets.jl ? using DomainSets I = Interval(0,1.) foo(x) = x^2 How to \[foo(x) for x ∈ I\] or map(foo,I) ?

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## [Policy Graph in SDDP.jl package](https://discourse.julialang.org/t/policy-graph-in-sddp-jl-package/100062)

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**Author:** [@Sorooshsa](https://discourse.julialang.org/u/Sorooshsa)\
**Replies:** 3\
**Last updated:** [December 3, 2025, 4:59am UTC](https://discourse.julialang.org/t/policy-graph-in-sddp-jl-package/100062 "2025-12-03T04:59:08Z")

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Hi, I know that there are a few options for making the graph of our problem while we use SDDP.jl e.g. linear policy graph, Markov policy graph. I have two questions: What is the difference between the Linear and Mark…

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## [Features of FMUGeneration](https://discourse.julialang.org/t/features-of-fmugeneration/132812)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 11\
**Last updated:** [December 3, 2025, 4:54am UTC](https://discourse.julialang.org/t/features-of-fmugeneration/132812 "2025-12-03T04:54:05Z")

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The package FMUGeneration works for me now (see here). Follow-up questions: Is an FMU file always OS specific? Do I need three of them if I want to support Windows, Mac, and Linux? Does the user of an FMU need to have …

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## [RepliBuild.jl](https://discourse.julialang.org/t/replibuild-jl/134065)

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**Author:** [@obsidianjulua](https://discourse.julialang.org/u/obsidianjulua)\
**Replies:** 10\
**Last updated:** [December 2, 2025, 7:34pm UTC](https://discourse.julialang.org/t/replibuild-jl/134065 "2025-12-02T19:34:10Z")

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Been working on a julia build orchestrator, using llvm directly and clang for deps graphs and configuring to a toml, generating executables, shared libraries, or binary wrapping in julia, without the traditional hand cod…

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## [What is the most ideal predictor for predicting binary vectors?](https://discourse.julialang.org/t/what-is-the-most-ideal-predictor-for-predicting-binary-vectors/134260)

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**Author:** [@WuSiren](https://discourse.julialang.org/u/WuSiren)\
**Replies:** 6\
**Last updated:** [December 2, 2025, 3:13pm UTC](https://discourse.julialang.org/t/what-is-the-most-ideal-predictor-for-predicting-binary-vectors/134260 "2025-12-02T15:13:59Z")

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I want to predict a vector whose elements are binary. What is the most promising machine learning model for doing this at present? Is there a corresponding Julia package?

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## [Testing and tolerances for implicitly calculated functions and their AD](https://discourse.julialang.org/t/testing-and-tolerances-for-implicitly-calculated-functions-and-their-ad/133575)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 3\
**Last updated:** [December 2, 2025, 12:49pm UTC](https://discourse.julialang.org/t/testing-and-tolerances-for-implicitly-calculated-functions-and-their-ad/133575 "2025-12-02T12:49:17Z")

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To fix ideas, suppose we have a function x = g(p) defined by f(x(p), p) = 0, both arguments are scalars. The numerical implementation involves finding an x such that | f(x, p)| \\le \\mathrm{tol}, either by Newton’s metho…

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## [Modeling min() in JuMP at scale: SOS1 stops converging, Big-M is numerically unstable](https://discourse.julialang.org/t/modeling-min-in-jump-at-scale-sos1-stops-converging-big-m-is-numerically-unstable/134251)

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**Author:** [@Bhanuprakash\_Bahoju](https://discourse.julialang.org/u/Bhanuprakash_Bahoju)\
**Replies:** 11\
**Last updated:** [December 2, 2025, 11:13am UTC](https://discourse.julialang.org/t/modeling-min-in-jump-at-scale-sos1-stops-converging-big-m-is-numerically-unstable/134251 "2025-12-02T11:13:52Z")

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I’m implementing a formula engine in JuMP where users can define expressions like: z = min(x, y) and I translate these automatically into JuMP constraints. I have tried two formulations: 1. SOS1 formulation function…

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## [Png(p, file\_name) always shows the plot \[Plots.jl, GR\]](https://discourse.julialang.org/t/png-p-file-name-always-shows-the-plot-plots-jl-gr/134225)

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**Author:** [@AdamWysokinski](https://discourse.julialang.org/u/AdamWysokinski)\
**Replies:** 1\
**Last updated:** [December 1, 2025, 5:28pm UTC](https://discourse.julialang.org/t/png-p-file-name-always-shows-the-plot-plots-jl-gr/134225 "2025-12-01T17:28:49Z")

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Hi, I think the behaviour of show() has changed recently. Calling: using Plots p = plot(rand(10)); png(p, tempname()) always shows the plot. Same for: using Plots p = plot(rand(10)); io = PipeBuffer() png(p, io); # …

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## [ForwardDiff with ModelingToolkit: Type conversion error in MTKParameters with DAE systems](https://discourse.julialang.org/t/forwarddiff-with-modelingtoolkit-type-conversion-error-in-mtkparameters-with-dae-systems/134145)

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**Author:** [@Danijel-Zadravec](https://discourse.julialang.org/u/Danijel-Zadravec)\
**Replies:** 2\
**Last updated:** [December 1, 2025, 12:21pm UTC](https://discourse.julialang.org/t/forwarddiff-with-modelingtoolkit-type-conversion-error-in-mtkparameters-with-dae-systems/134145 "2025-12-01T12:21:26Z")

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Hi everyone, I’m encountering a MethodError when trying to follow this example from the ModelingToolkit documentation. The problem seems to be related with dual number propagation in ODEProblems that have the property: …

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## [Adaptive barrier method for constrained optimization](https://discourse.julialang.org/t/adaptive-barrier-method-for-constrained-optimization/134150)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 6\
**Last updated:** [December 1, 2025, 8:57am UTC](https://discourse.julialang.org/t/adaptive-barrier-method-for-constrained-optimization/134150 "2025-12-01T08:57:32Z")

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Hi all, I’m refactoring some old R code into Julia. In R I was using constrOptim: Linearly Constrained Optimization which lets us use constraints like U \\theta - c \\geq 0, where \\theta is our parameters to be optimized, U…

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## [Lagrange multipliers of a \`VectorNonlinearOracle\` after solve](https://discourse.julialang.org/t/lagrange-multipliers-of-a-vectornonlinearoracle-after-solve/134236)

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**Author:** [@franckgaga](https://discourse.julialang.org/u/franckgaga)\
**Replies:** 1\
**Last updated:** [November 30, 2025, 7:39pm UTC](https://discourse.julialang.org/t/lagrange-multipliers-of-a-vectornonlinearoracle-after-solve/134236 "2025-11-30T19:39:32Z")

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I have a nonlinear optimization problem that relies on MOI.VectorNonlinearOracle for the constraints. I would like to compute the Hessian of the Langrangian at the optimum after solving, or, in other words, fetching the r…

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## [ChainRules error when using Mooncake in Optimization.jl](https://discourse.julialang.org/t/chainrules-error-when-using-mooncake-in-optimization-jl/134240)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 0\
**Last updated:** [November 30, 2025, 7:10pm UTC](https://discourse.julialang.org/t/chainrules-error-when-using-mooncake-in-optimization-jl/134240 "2025-11-30T19:10:28Z")

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Hi all, I am testing out using the SciML ecosystem to fit constrained splines inside of an ODE (some terms on the RHS of the ODE are given by evaluating a spline where the point of evaluation on the domain of the spline …

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## [KernelAbstractions + CUDA + Reactant - how to get minimal working example](https://discourse.julialang.org/t/kernelabstractions-cuda-reactant-how-to-get-minimal-working-example/134164)

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**Author:** [@Jakub\_Mitura](https://discourse.julialang.org/u/Jakub_Mitura)\
**Replies:** 12\
**Last updated:** [November 30, 2025, 6:34am UTC](https://discourse.julialang.org/t/kernelabstractions-cuda-reactant-how-to-get-minimal-working-example/134164 "2025-11-30T06:34:06Z")

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Hello I tried to get minimal working example for reactant powered kernel abstractions plus Enzyme like using Pkg Pkg.activate(".") using Reactant using KernelAbstractions using CUDA using Enzyme using Test # Simple squ…

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## [Best way to model a piecewise linearization for \`f(x) = x^0.8\` on \`\[0, 1e5\]\` with PiecewiseLinearOpt.jl?](https://discourse.julialang.org/t/best-way-to-model-a-piecewise-linearization-for-f-x-x-0-8-on-0-1e5-with-piecewiselinearopt-jl/131963)

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**Author:** [@karei](https://discourse.julialang.org/u/karei)\
**Replies:** 3\
**Last updated:** [November 28, 2025, 10:39am UTC](https://discourse.julialang.org/t/best-way-to-model-a-piecewise-linearization-for-f-x-x-0-8-on-0-1e5-with-piecewiselinearopt-jl/131963 "2025-11-28T10:39:13Z")

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Hi all, I have an optimization model where I need to replace a concave cost term f(x) = x^{0.8} for x \\in \[0, 10^5\] with a piecewise linear (PWL) form in JuMP. The model is a minimization, and I’m considering using Pie…

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## [DiffOpt / JuMP: zero gradient for variable fixed by equality constraint](https://discourse.julialang.org/t/diffopt-jump-zero-gradient-for-variable-fixed-by-equality-constraint/134041)

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**Author:** [@yeomoon](https://discourse.julialang.org/u/yeomoon)\
**Replies:** 12\
**Last updated:** [November 28, 2025, 5:36am UTC](https://discourse.julialang.org/t/diffopt-jump-zero-gradient-for-variable-fixed-by-equality-constraint/134041 "2025-11-28T05:36:03Z")

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Hi all, I’m trying to train a neural network that is followed by a differentiable optimization layer in Julia. Conceptually it’s: Flux NN → Economic Dispatch layer (ED layer) → Loss The ED layer is implemented as a …

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## [L-moment package?](https://discourse.julialang.org/t/l-moment-package/54536)

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**Author:** [@tomtom](https://discourse.julialang.org/u/tomtom)\
**Replies:** 1\
**Last updated:** [November 28, 2025, 2:00am UTC](https://discourse.julialang.org/t/l-moment-package/54536 "2025-11-28T02:00:13Z")

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hello, I wonder if L-moment related summary statistics are available in any Julia package? thanks.

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## [Meshgrid function in Julia](https://discourse.julialang.org/t/meshgrid-function-in-julia/48679)

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**Author:** [@Hrishikesh\_Das](https://discourse.julialang.org/u/Hrishikesh_Das)\
**Replies:** 35\
**Last updated:** [November 27, 2025, 11:05am UTC](https://discourse.julialang.org/t/meshgrid-function-in-julia/48679 "2025-11-27T11:05:15Z")

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hello everyone I am new to Julia. Earlier I was using Matlab but now I have started to work in Julia. I would like to know is there any similar function available in julia like Meshgrid which is available in matlab. Plea…

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## [ModelingToolkit fails to precompile on Julia 1.12 (UndefVarError: ODESystem not defined in ModelingToolkit)](https://discourse.julialang.org/t/modelingtoolkit-fails-to-precompile-on-julia-1-12-undefvarerror-odesystem-not-defined-in-modelingtoolkit/134133)

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**Author:** [@junmorenodi99](https://discourse.julialang.org/u/junmorenodi99)\
**Replies:** 11\
**Last updated:** [November 27, 2025, 7:56am UTC](https://discourse.julialang.org/t/modelingtoolkit-fails-to-precompile-on-julia-1-12-undefvarerror-odesystem-not-defined-in-modelingtoolkit/134133 "2025-11-27T07:56:46Z")

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Hi everyone, I’m having trouble with ModelingToolkit precompilation on Julia 1.12 on Windows, and I can’t figure out what’s triggering it. In my project I’m just adding some libraries (including ModelingToolkit) : usi…

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## [Plots with log or symlog scale](https://discourse.julialang.org/t/plots-with-log-or-symlog-scale/15961)

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**Author:** [@aplavin](https://discourse.julialang.org/u/aplavin)\
**Replies:** 5\
**Last updated:** [November 27, 2025, 1:49am UTC](https://discourse.julialang.org/t/plots-with-log-or-symlog-scale/15961 "2025-11-27T01:49:35Z")

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I’m trying to make plots with log and symlog scales, but no success with Plots.jl so far. When I try cgrad(scale=:log) it gives strange results, see below. And there seem to be no other place to specify log-scale. A = r…

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## [ModelingToolkit: How to interpret "ERROR: Cyclic guesses detected in the system" during initialization?](https://discourse.julialang.org/t/modelingtoolkit-how-to-interpret-error-cyclic-guesses-detected-in-the-system-during-initialization/134146)

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**Author:** [@NicholasHemenway](https://discourse.julialang.org/u/NicholasHemenway)\
**Replies:** 2\
**Last updated:** [November 26, 2025, 10:52pm UTC](https://discourse.julialang.org/t/modelingtoolkit-how-to-interpret-error-cyclic-guesses-detected-in-the-system-during-initialization/134146 "2025-11-26T22:52:07Z")

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I’ve got a simple RC circuit with two series resistors: using ModelingToolkit, DifferentialEquations using ModelingToolkitStandardLibrary.Electrical using ModelingToolkitStandardLibrary.Blocks @mtkmodel Circuit begin …

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## [CairoMakie.jl, MathTeXEngine.jl, Small Caps](https://discourse.julialang.org/t/cairomakie-jl-mathtexengine-jl-small-caps/133985)

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**Author:** [@mpirke](https://discourse.julialang.org/u/mpirke)\
**Replies:** 7\
**Last updated:** [November 26, 2025, 8:35pm UTC](https://discourse.julialang.org/t/cairomakie-jl-mathtexengine-jl-small-caps/133985 "2025-11-26T20:35:54Z")

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Hi there! I have been struggling for the last hour with the following issue. I want to have a word in small caps within my legend in a CairoMakie plot. To get a word in small caps in Latex I just do \\textsc{Foo}. Her…

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## [Use of global variables for defining default values in ModelingToolkit bad?](https://discourse.julialang.org/t/use-of-global-variables-for-defining-default-values-in-modelingtoolkit-bad/134123)

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**Author:** [@NicholasHemenway](https://discourse.julialang.org/u/NicholasHemenway)\
**Replies:** 3\
**Last updated:** [November 26, 2025, 4:52pm UTC](https://discourse.julialang.org/t/use-of-global-variables-for-defining-default-values-in-modelingtoolkit-bad/134123 "2025-11-26T16:52:48Z")

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I’m not sure how scoping is handled when constructing and subsequently simulating a ModelingToolkit model. Would the following code be “bad practice” since the default references a globally scoped variable? Or is only th…

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## [MadNLPGPU.jl not working for simple economic dispatch](https://discourse.julialang.org/t/madnlpgpu-jl-not-working-for-simple-economic-dispatch/134084)

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**Author:** [@shakedregev](https://discourse.julialang.org/u/shakedregev)\
**Replies:** 4\
**Last updated:** [November 26, 2025, 3:14pm UTC](https://discourse.julialang.org/t/madnlpgpu-jl-not-working-for-simple-economic-dispatch/134084 "2025-11-26T15:14:01Z")

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I’m having issues using MadNLPGPU.jl, while a similar code works for MadNLP.jl. I initially tried a direct conversion, then I read that Examodels is better for GPUs. I am not attached to the particular method to solve on…

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## [Potential issues with implementation of ziggurat algorithm](https://discourse.julialang.org/t/potential-issues-with-implementation-of-ziggurat-algorithm/134130)

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**Author:** [@MrBelette](https://discourse.julialang.org/u/MrBelette)\
**Replies:** 0\
**Last updated:** [November 26, 2025, 2:03am UTC](https://discourse.julialang.org/t/potential-issues-with-implementation-of-ziggurat-algorithm/134130 "2025-11-26T02:03:09Z")

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I’m seeing intermittent failures to finish issues when repeatedly running a kernel that calls randn many times. I’m wondering if someone can independently verify this behaviour, so I can decide if a bug needs to be repo…

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## [ContinuousCallback in DifferentialEquations.jl for the The Izhikevich Model](https://discourse.julialang.org/t/continuouscallback-in-differentialequations-jl-for-the-the-izhikevich-model/133883)

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**Author:** [@mongi](https://discourse.julialang.org/u/mongi)\
**Replies:** 7\
**Last updated:** [November 25, 2025, 2:52pm UTC](https://discourse.julialang.org/t/continuouscallback-in-differentialequations-jl-for-the-the-izhikevich-model/133883 "2025-11-25T14:52:52Z")

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Greetings, Is it possible to get the The Izhikevich Model to work with ContinuousCallback as the DiscreteCallback is not accurate near the zero-crossing. # function reset!(integrator) # @show integrator.u\[1\], integr…

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## [Parallelism within Turing.jl model](https://discourse.julialang.org/t/parallelism-within-turing-jl-model/54064)

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**Author:** [@EvoArt](https://discourse.julialang.org/u/EvoArt)\
**Replies:** 10\
**Last updated:** [November 25, 2025, 2:08pm UTC](https://discourse.julialang.org/t/parallelism-within-turing-jl-model/54064 "2025-11-25T14:08:40Z")

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Hi there, just wondering how safe it is to use Threads.@threads for loops within turing models e.g. @model function my\_func(Y) alpha ~ Normal(0,1) sigma ~ Normal(0,1) Threads.@threads for i in 1:size(Y)\[2…

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## [Error in testset gpuarrays/linalg/core](https://discourse.julialang.org/t/error-in-testset-gpuarrays-linalg-core/134091)

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**Author:** [@Roger\_Powell](https://discourse.julialang.org/u/Roger_Powell)\
**Replies:** 2\
**Last updated:** [November 25, 2025, 11:48am UTC](https://discourse.julialang.org/t/error-in-testset-gpuarrays-linalg-core/134091 "2025-11-25T11:48:08Z")

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First time user of CUDA.jl. My Julia versioninfo() is Julia Version 1.12.2 Commit ca9b6662be4 (2025-11-20 16:25 UTC) Build Info: Official https://julialang.org release Platform Info: OS: Linux (x86\_64-linux-gnu) C…

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## [How does ModelingToolkit handle time-varying, but purely algebraic problems?](https://discourse.julialang.org/t/how-does-modelingtoolkit-handle-time-varying-but-purely-algebraic-problems/134092)

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**Author:** [@NicholasHemenway](https://discourse.julialang.org/u/NicholasHemenway)\
**Replies:** 2\
**Last updated:** [November 25, 2025, 8:18am UTC](https://discourse.julialang.org/t/how-does-modelingtoolkit-handle-time-varying-but-purely-algebraic-problems/134092 "2025-11-25T08:18:16Z")

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I’ve constructed a simple resistive circuit with a quadratically increasing voltage using ModelingToolkit. The following diagram gives a graphical depiction of the code below: using ModelingToolkit using ModelingTool…

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## [Trouble using Arial italic font in Makie](https://discourse.julialang.org/t/trouble-using-arial-italic-font-in-makie/134097)

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**Author:** [@JonasWickman](https://discourse.julialang.org/u/JonasWickman)\
**Replies:** 4\
**Last updated:** [November 24, 2025, 9:25pm UTC](https://discourse.julialang.org/t/trouble-using-arial-italic-font-in-makie/134097 "2025-11-24T21:25:11Z")

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I used to be able to use italics when using the Arial font in Makie, but for some reason, it no longer works. Below are two code snippets, one using Arial, and one using Verdana (both from the same ttf-mscorefonts-instal…

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