# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=40

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**Page:** 41

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## [Dual\_ftol\_rel keyword not allowed in Optimization.jl](https://discourse.julialang.org/t/dual-ftol-rel-keyword-not-allowed-in-optimization-jl/129480)

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**Author:** [@miguelborrero](https://discourse.julialang.org/u/miguelborrero)\
**Replies:** 1\
**Last updated:** [May 30, 2025, 5:58pm UTC](https://discourse.julialang.org/t/dual-ftol-rel-keyword-not-allowed-in-optimization-jl/129480 "2025-05-30T17:58:29Z")

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Hi there, I’m trying out different solvers for my problem which requires evaluation of non-linear constraints. Currently I’m trying NLopt thought Optimization in particular LD\_CCSAQ solver. However, its taking forever a…

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## [Transient Stokes - Mass Matrix DAE - Dirichlet Boundary Conditions - Jacobian](https://discourse.julialang.org/t/transient-stokes-mass-matrix-dae-dirichlet-boundary-conditions-jacobian/129459)

<div class="topic-metadata">

**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 1\
**Last updated:** [May 30, 2025, 1:24pm UTC](https://discourse.julialang.org/t/transient-stokes-mass-matrix-dae-dirichlet-boundary-conditions-jacobian/129459 "2025-05-30T13:24:44Z")

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I am attempting to solve transient Stokes flow in a canonical channel (parabolic inlet, no-slip bottom and top wall, fixed pressure and inlet). The Stokes problem leads to a mass-matrix DAE. A naive hand code backward E…

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## [Checking that a position is inside a AREA works in EPSG:25382 projection, but not in CRS84](https://discourse.julialang.org/t/checking-that-a-position-is-inside-a-area-works-in-epsg-25382-projection-but-not-in-crs84/129471)

<div class="topic-metadata">

**Author:** [@sfuerst](https://discourse.julialang.org/u/sfuerst)\
**Replies:** 1\
**Last updated:** [May 30, 2025, 11:52am UTC](https://discourse.julialang.org/t/checking-that-a-position-is-inside-a-area-works-in-epsg-25382-projection-but-not-in-crs84/129471 "2025-05-30T11:52:00Z")

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I have first to say, that I’m a newbie when it comes to geo-related stuff, so please excuse me if I ask or formulate something stupid here, but I’ve been biting my teeth out on this problem for hours. First a little con…

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## [CUDA suddenly crashes with check-bounds=no, used to work fine](https://discourse.julialang.org/t/cuda-suddenly-crashes-with-check-bounds-no-used-to-work-fine/129245)

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**Author:** [@0samuraiE](https://discourse.julialang.org/u/0samuraiE)\
**Replies:** 1\
**Last updated:** [May 30, 2025, 9:43am UTC](https://discourse.julialang.org/t/cuda-suddenly-crashes-with-check-bounds-no-used-to-work-fine/129245 "2025-05-30T09:43:52Z")

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Hi all, I have some code that used to work perfectly fine with check-bounds=no, but recently it started crashing with a bounds error. If I run it with check-bounds=yes, it works without any issues. I noticed that the s…

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## [Makie datashader color corruption](https://discourse.julialang.org/t/makie-datashader-color-corruption/129460)

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**Author:** [@cmarcotte](https://discourse.julialang.org/u/cmarcotte)\
**Replies:** 6\
**Last updated:** [May 30, 2025, 9:39am UTC](https://discourse.julialang.org/t/makie-datashader-color-corruption/129460 "2025-05-30T09:39:35Z")

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Hello, I am running into a bizarre coloration issue with Makie (GLMakie) with the datashader – this leads to a bright blue color on-screen, while the saved figure is red (as it is in the example). Additionally, the on-…

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## [Turing with both Poisson and Gaussian noise](https://discourse.julialang.org/t/turing-with-both-poisson-and-gaussian-noise/129369)

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**Author:** [@Cyan](https://discourse.julialang.org/u/Cyan)\
**Replies:** 3\
**Last updated:** [May 30, 2025, 7:54am UTC](https://discourse.julialang.org/t/turing-with-both-poisson-and-gaussian-noise/129369 "2025-05-30T07:54:18Z")

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I have a set of data with both Poisson and Gaussian noise, which distribution I should choose in likelihood? My dataset looks like obs = data + Poisson + Gaussian PS My data is a series of images, it contains Gaussia…

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## [What should be the acceptable tolerance value between the lower bound and the estimated upper bound for the results of SDDP.jl to be reliable?](https://discourse.julialang.org/t/what-should-be-the-acceptable-tolerance-value-between-the-lower-bound-and-the-estimated-upper-bound-for-the-results-of-sddp-jl-to-be-reliable/129450)

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**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 4\
**Last updated:** [May 30, 2025, 7:40am UTC](https://discourse.julialang.org/t/what-should-be-the-acceptable-tolerance-value-between-the-lower-bound-and-the-estimated-upper-bound-for-the-results-of-sddp-jl-to-be-reliable/129450 "2025-05-30T07:40:04Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem. In this regard, I want to determine a tolerance value for the gap between the lower bound and the estimated upper bound …

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## [ExtendableFEM - Penalty Method - Total Pressure Inlet Condition](https://discourse.julialang.org/t/extendablefem-penalty-method-total-pressure-inlet-condition/129448)

<div class="topic-metadata">

**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 2\
**Last updated:** [May 30, 2025, 7:30am UTC](https://discourse.julialang.org/t/extendablefem-penalty-method-total-pressure-inlet-condition/129448 "2025-05-30T07:30:38Z")

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Greetings. Does it make sense to attempt extending ExtendableFEM.jl/examples/Example235\_StokesIteratedPenalty.jl at master · WIAS-PDELib/ExtendableFEM.jl · GitHub to implement a total pressure inlet boundary condition? …

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## [Where is the "rate\_a" in PowerModels.jl from](https://discourse.julialang.org/t/where-is-the-rate-a-in-powermodels-jl-from/129424)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 8\
**Last updated:** [May 29, 2025, 11:52pm UTC](https://discourse.julialang.org/t/where-is-the-rate-a-in-powermodels-jl-from/129424 "2025-05-29T23:52:24Z")

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The data provided by PowerModels.jl is inconsistent with my local raw Matpower file. The latter is all zero (seems to mean that there is no limit), but the former has a vector of numbers that I can’t tell where they com…

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## [DifferentialEquations.jl Mass Matrix DAE Explicit](https://discourse.julialang.org/t/differentialequations-jl-mass-matrix-dae-explicit/129447)

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**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 3\
**Last updated:** [May 29, 2025, 8:07pm UTC](https://discourse.julialang.org/t/differentialequations-jl-mass-matrix-dae-explicit/129447 "2025-05-29T20:07:25Z")

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Are any of the methods listed at Mass Matrix and Fully Implicit DAE Solvers · DifferentialEquations.jl explicit in time, and therefore not require a Jacobian? Reason for asking is that solving time-dependent Stokes flow…

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## [How to solve infinite horizon problem under Makovian policy graph in SDDP.jl?](https://discourse.julialang.org/t/how-to-solve-infinite-horizon-problem-under-makovian-policy-graph-in-sddp-jl/129420)

<div class="topic-metadata">

**Author:** [@Engr\_Moiz\_Ahmad](https://discourse.julialang.org/u/Engr_Moiz_Ahmad)\
**Replies:** 16\
**Last updated:** [May 29, 2025, 7:28pm UTC](https://discourse.julialang.org/t/how-to-solve-infinite-horizon-problem-under-makovian-policy-graph-in-sddp-jl/129420 "2025-05-29T19:28:08Z")

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I am dealing with a multi-stage mixed-integer stochastic global supply chain optimization problem and want to solve infinite-horizon problem instances under a Markovian policy graph. I am using the Markovian policy graph…

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## [Passing a Cache to optimization function](https://discourse.julialang.org/t/passing-a-cache-to-optimization-function/129321)

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**Author:** [@miguelborrero](https://discourse.julialang.org/u/miguelborrero)\
**Replies:** 21\
**Last updated:** [May 29, 2025, 6:24pm UTC](https://discourse.julialang.org/t/passing-a-cache-to-optimization-function/129321 "2025-05-29T18:24:57Z")

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Hi! In my original problem the computation of the objective value function is expensive and during the computation I can collaterally compute the constraints of my problem. To make my problem more efficient I tried to i…

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## [Metaheuristics.jl ECA() requires redefinition between solves, making it incompatible with Optimization.jl Ensemble Problems](https://discourse.julialang.org/t/metaheuristics-jl-eca-requires-redefinition-between-solves-making-it-incompatible-with-optimization-jl-ensemble-problems/129286)

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**Author:** [@johnb](https://discourse.julialang.org/u/johnb)\
**Replies:** 1\
**Last updated:** [May 29, 2025, 2:55pm UTC](https://discourse.julialang.org/t/metaheuristics-jl-eca-requires-redefinition-between-solves-making-it-incompatible-with-optimization-jl-ensemble-problems/129286 "2025-05-29T14:55:54Z")

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I’m performing an optimization where the number of parameters used is varied across the ensemble. (e.g. prob 1 uses 1 parameter, prob 2 uses 2 parameters) Unfortunately, the algorithm that seems to work best with my spec…

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## [BMS Current Control using Callbacks in ModelingToolKit](https://discourse.julialang.org/t/bms-current-control-using-callbacks-in-modelingtoolkit/129336)

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**Author:** [@madtorresga](https://discourse.julialang.org/u/madtorresga)\
**Replies:** 2\
**Last updated:** [May 29, 2025, 1:38pm UTC](https://discourse.julialang.org/t/bms-current-control-using-callbacks-in-modelingtoolkit/129336 "2025-05-29T13:38:17Z")

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I want to implement a battery management system that simulates the internal behaviour of a cell (ECM), and controls the incoming current based on a voltage limit (here 3.8V). I’m trying to do this using ModelingToolkit.j…

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## [Genie Builder 1.0 Now in VS Code: Build Genie Web Apps around your Julia code 10x faster](https://discourse.julialang.org/t/genie-builder-1-0-now-in-vs-code-build-genie-web-apps-around-your-julia-code-10x-faster/114481)

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**Author:** [@essenciary](https://discourse.julialang.org/u/essenciary)\
**Replies:** 3\
**Last updated:** [May 29, 2025, 11:07am UTC](https://discourse.julialang.org/t/genie-builder-1-0-now-in-vs-code-build-genie-web-apps-around-your-julia-code-10x-faster/114481 "2025-05-29T11:07:49Z")

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Hi everybody, Super happy to share that Genie Builder 1.0 is now available on the VS Code Marketplace! Genie Builder is our new and powerful tool that makes it easy and quick to build web applications around your Julia …

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## [Facing high loss values when training the SciML model](https://discourse.julialang.org/t/facing-high-loss-values-when-training-the-sciml-model/129273)

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**Author:** [@Rohan\_Kumar\_123](https://discourse.julialang.org/u/Rohan_Kumar_123)\
**Replies:** 1\
**Last updated:** [May 29, 2025, 10:59am UTC](https://discourse.julialang.org/t/facing-high-loss-values-when-training-the-sciml-model/129273 "2025-05-29T10:59:47Z")

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Greetings, i am currently working on a problem to predict the state vectors of a satellite using a dataset which is generated by a propagator. I have made a Universal Differential Equation(UDE) to predict the state vecto…

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## [Read from file a (Convex.jl) problem](https://discourse.julialang.org/t/read-from-file-a-convex-jl-problem/129402)

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**Author:** [@CaG21](https://discourse.julialang.org/u/CaG21)\
**Replies:** 4\
**Last updated:** [May 29, 2025, 6:20am UTC](https://discourse.julialang.org/t/read-from-file-a-convex-jl-problem/129402 "2025-05-29T06:20:38Z")

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I saved a convex problem, not solved yet, created by using Convex.jl, in a MOF/JSON file, with the write\_to\_file function. Now, I want to read that problem and start the opimization using the function Convex.solve!. How…

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## [SciMLOperators "\*" function for TransposedOperator](https://discourse.julialang.org/t/scimloperators-function-for-transposedoperator/129422)

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**Author:** [@fdekerme](https://discourse.julialang.org/u/fdekerme)\
**Replies:** 2\
**Last updated:** [May 29, 2025, 1:55am UTC](https://discourse.julialang.org/t/scimloperators-function-for-transposedoperator/129422 "2025-05-29T01:55:57Z")

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Hello :grinning:, I want to use SciMLOperators.jl with LinearSolve.jl to solve a linear system like \\left( A^T V^{-1} A + \\lambda (W - I)^T (W - I) \\right) x = A^T V^{-1} \\mu I created a FunctionOperator for A, V\_in…

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## [DBInterface prepared statement with named parameters not working](https://discourse.julialang.org/t/dbinterface-prepared-statement-with-named-parameters-not-working/129287)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 6\
**Last updated:** [May 29, 2025, 1:19am UTC](https://discourse.julialang.org/t/dbinterface-prepared-statement-with-named-parameters-not-working/129287 "2025-05-29T01:19:52Z")

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Based on reading the docs at GitHub - JuliaDatabases/DBInterface.jl: Database interface definitions for Julia, I thought that I could use named parameters in a prepared statement to update data, which did not work. Howev…

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## [Remake problem with modeltoolkitized ODE function](https://discourse.julialang.org/t/remake-problem-with-modeltoolkitized-ode-function/118339)

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**Author:** [@Vitor\_Patricio\_Canta](https://discourse.julialang.org/u/Vitor_Patricio_Canta)\
**Replies:** 1\
**Last updated:** [May 29, 2025, 12:08am UTC](https://discourse.julialang.org/t/remake-problem-with-modeltoolkitized-ode-function/118339 "2025-05-29T00:08:40Z")

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Hi, I have a model that follows more or less the reccomendations of the “Solving Large Stiff Equations” tutorial that I was trying to optimize the parameters for. However I have encountered a problem with the remake app…

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## [How to resolve a nonlinear equations system in GPU (parallel)](https://discourse.julialang.org/t/how-to-resolve-a-nonlinear-equations-system-in-gpu-parallel/118226)

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**Author:** [@Juan\_jose](https://discourse.julialang.org/u/Juan_jose)\
**Replies:** 4\
**Last updated:** [May 29, 2025, 12:05am UTC](https://discourse.julialang.org/t/how-to-resolve-a-nonlinear-equations-system-in-gpu-parallel/118226 "2025-05-29T00:05:20Z")

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Hello, I’m new using Julia and I’m trying to solve a large system of nonlinear equations (\>768 equations, \>200 unknowns). I was reading the documentation for NonlinearSolve.jl, and although it mentioned that for solvers …

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## [Re-sizing DenseAxisArray Containers in JuMP](https://discourse.julialang.org/t/re-sizing-denseaxisarray-containers-in-jump/129367)

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**Author:** [@suwuken](https://discourse.julialang.org/u/suwuken)\
**Replies:** 6\
**Last updated:** [May 28, 2025, 8:33pm UTC](https://discourse.julialang.org/t/re-sizing-denseaxisarray-containers-in-jump/129367 "2025-05-28T20:33:22Z")

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I have a model with named variables as DenseAxisArray, e.g., using JuMP model = direct\_model(Gurobi.Optimizer()) model\[:x\] = @variable(model, 1 \>= x\[1:10, 1:5, 1:2\] \>= 0) This creates a DenseAxisArray which I can acces…

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## [Bottom and top in text in Makie](https://discourse.julialang.org/t/bottom-and-top-in-text-in-makie/129403)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 2\
**Last updated:** [May 28, 2025, 1:50pm UTC](https://discourse.julialang.org/t/bottom-and-top-in-text-in-makie/129403 "2025-05-28T13:50:37Z")

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I suspect that the “top” and “bottom” here should be swapped? Note that I mean that the API text!(; align = ...) should be modified. I don’t mean the tutorial itself . The text is just above the baseline—this is the…

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## [Plot lots of surfaces with normals](https://discourse.julialang.org/t/plot-lots-of-surfaces-with-normals/129377)

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**Author:** [@weymouth](https://discourse.julialang.org/u/weymouth)\
**Replies:** 5\
**Last updated:** [May 28, 2025, 11:46am UTC](https://discourse.julialang.org/t/plot-lots-of-surfaces-with-normals/129377 "2025-05-28T11:46:27Z")

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I have an array of named tuples, each of which describes a 3D panel. Panels corners, centers, areas, normal vector, etc. I want to plot the panels and be able to apply a color to each one. I would like to use Plots and p…

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## [Extension methods for various backends](https://discourse.julialang.org/t/extension-methods-for-various-backends/129401)

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**Author:** [@weymouth](https://discourse.julialang.org/u/weymouth)\
**Replies:** 1\
**Last updated:** [May 28, 2025, 10:00am UTC](https://discourse.julialang.org/t/extension-methods-for-various-backends/129401 "2025-05-28T10:00:08Z")

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We are using Makie to build up some plotting extensions for a few packages, but we have older extension methods for Plots as well. If the user only have Plots or only has Makie, everything works, but what if they have in…

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## [BifurcationKit nd point periodic orbit](https://discourse.julialang.org/t/bifurcationkit-nd-point-periodic-orbit/129384)

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**Author:** [@Mehmet\_On](https://discourse.julialang.org/u/Mehmet_On)\
**Replies:** 2\
**Last updated:** [May 28, 2025, 9:58am UTC](https://discourse.julialang.org/t/bifurcationkit-nd-point-periodic-orbit/129384 "2025-05-28T09:58:32Z")

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Hello, I am new to Julia and BifurcationKit.jl. I would like to simulate a model, 6 differential equations, 4 complex 2 real variables. Because I am new, I started from a simplified version, 2 equations, 2 complex variab…

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## [Finding Parameters for Boundary-Value Problem using DifferentialEquations.jl](https://discourse.julialang.org/t/finding-parameters-for-boundary-value-problem-using-differentialequations-jl/129386)

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**Author:** [@parf](https://discourse.julialang.org/u/parf)\
**Replies:** 2\
**Last updated:** [May 28, 2025, 9:50am UTC](https://discourse.julialang.org/t/finding-parameters-for-boundary-value-problem-using-differentialequations-jl/129386 "2025-05-28T09:50:21Z")

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Hello everyone! I have a system of equations, the solution of which defines a trajectory on a plane: dx/dt = Vx(x,y,t,p), dy/dt = Vy(x,y,t,p), where p is some unknown parameter. I know the starting point of the trajec…

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## [Matrix to dataframe conversion with structure of existing dataframe](https://discourse.julialang.org/t/matrix-to-dataframe-conversion-with-structure-of-existing-dataframe/129278)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 4\
**Last updated:** [May 28, 2025, 8:51am UTC](https://discourse.julialang.org/t/matrix-to-dataframe-conversion-with-structure-of-existing-dataframe/129278 "2025-05-28T08:51:46Z")

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Is there any built-in function to convert a matrix to a DataFrame with the structure of a second DataFrame ? i.e. : df = DataFrame(a = \[1,2,3\], b= \["a","b","c"\]) # Option 1, types not promoted dfnames = names(df) m = …

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## [Unusually Slow First Device-to-Host Copy on A100 GPU](https://discourse.julialang.org/t/unusually-slow-first-device-to-host-copy-on-a100-gpu/129348)

<div class="topic-metadata">

**Author:** [@magicura](https://discourse.julialang.org/u/magicura)\
**Replies:** 6\
**Last updated:** [May 27, 2025, 8:57pm UTC](https://discourse.julialang.org/t/unusually-slow-first-device-to-host-copy-on-a100-gpu/129348 "2025-05-27T20:57:54Z")

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Hi everyone, I’m running into an issue where the first attempt to copy data from the device to the host is extremely slow. This problem persists even after running the function multiple times, so I don’t think it’s rela…

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## [Gurobi compute IIS in Julia](https://discourse.julialang.org/t/gurobi-compute-iis-in-julia/129391)

<div class="topic-metadata">

**Author:** [@cby](https://discourse.julialang.org/u/cby)\
**Replies:** 1\
**Last updated:** [May 27, 2025, 8:37pm UTC](https://discourse.julialang.org/t/gurobi-compute-iis-in-julia/129391 "2025-05-27T20:37:31Z")

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What is the equivalent of the following in Julia? https://support.gurobi.com/hc/en-us/articles/15656630439441-How-do-I-use-compute-IIS-to-find-a-subset-of-constraints-that-are-causing-model-infeasibility I understand I…

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