# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=15

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

**Page:** 16

---

## [DifferentiationInterface not generating correct shadow](https://discourse.julialang.org/t/differentiationinterface-not-generating-correct-shadow/131868)

<div class="topic-metadata">

**Author:** [@alexl123](https://discourse.julialang.org/u/alexl123)\
**Replies:** 11\
**Last updated:** [January 4, 2026, 9:01am UTC](https://discourse.julialang.org/t/differentiationinterface-not-generating-correct-shadow/131868 "2026-01-04T09:01:42Z")

</div>

Hello! I am trying to play with the Sophia optimization algorthim. I am storing my parameters as a ComponentArray since some parameters are scalar and others are vectors. When I use a first order method (Adam) I have no…

---

## [How to add Colorbar to heatmap!](https://discourse.julialang.org/t/how-to-add-colorbar-to-heatmap/134736)

<div class="topic-metadata">

**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 2\
**Last updated:** [January 4, 2026, 8:33am UTC](https://discourse.julialang.org/t/how-to-add-colorbar-to-heatmap/134736 "2026-01-04T08:33:37Z")

</div>

I fail to grasp Makie’s doc on how to add a Colorbar, if the user use heatmap! instead of heatmap. After reading the doc, I only know that this works data = reshape(1:25, 5, 5) fig, ax, hm = heatmap(data) Colorbar(fig\[…

---

## [Converting result of round or floor as Int in Metal](https://discourse.julialang.org/t/converting-result-of-round-or-floor-as-int-in-metal/98545)

<div class="topic-metadata">

**Author:** [@f.ij](https://discourse.julialang.org/u/f.ij)\
**Replies:** 10\
**Last updated:** [December 31, 2025, 5:35pm UTC](https://discourse.julialang.org/t/converting-result-of-round-or-floor-as-int-in-metal/98545 "2025-12-31T17:35:27Z")

</div>

I’m trying to get into GPU programming and I’m trying to write a simple kernel that calculates the correlation function of an image. I’ve run into a problem where I cannot convert the result of the round or floor functio…

---

## [Looking for Examples of Symbolic Regression for predicting Hidden Markov Models](https://discourse.julialang.org/t/looking-for-examples-of-symbolic-regression-for-predicting-hidden-markov-models/134749)

<div class="topic-metadata">

**Author:** [@mj2984](https://discourse.julialang.org/u/mj2984)\
**Replies:** 9\
**Last updated:** [December 31, 2025, 2:03am UTC](https://discourse.julialang.org/t/looking-for-examples-of-symbolic-regression-for-predicting-hidden-markov-models/134749 "2025-12-31T02:03:53Z")

</div>

I have a set of time series data that track an observable (o(t)) vs control signal (c(t)) over a period of time. One way I know to model this system is using Recurrent Neural Networks or some variant of it. I am looking …

---

## [RFC: Reverse Communication (ask/tell) adapter for function-style optimizers in Julia?](https://discourse.julialang.org/t/rfc-reverse-communication-ask-tell-adapter-for-function-style-optimizers-in-julia/134803)

<div class="topic-metadata">

**Author:** [@karei](https://discourse.julialang.org/u/karei)\
**Replies:** 1\
**Last updated:** [December 30, 2025, 7:44pm UTC](https://discourse.julialang.org/t/rfc-reverse-communication-ask-tell-adapter-for-function-style-optimizers-in-julia/134803 "2025-12-30T19:44:02Z")

</div>

Hi all, I’d like to start a discussion on a generic Reverse Communication Interface (RCI), i.e. an ask/tell-style session API, for Julia’s optimization ecosystem. The idea is to sit on top of existing “function-style” o…

---

## [Molly for Emulsion Rheology](https://discourse.julialang.org/t/molly-for-emulsion-rheology/133386)

<div class="topic-metadata">

**Author:** [@ziolai](https://discourse.julialang.org/u/ziolai)\
**Replies:** 15\
**Last updated:** [December 29, 2025, 10:54pm UTC](https://discourse.julialang.org/t/molly-for-emulsion-rheology/133386 "2025-12-29T22:54:46Z")

</div>

Greetings, How does one implement on imposed shear force in MD simulations in general and Molly in particular? For context, see e.g. https://github.com/ziolai/finite\_element\_electrical\_engineering/tree/main/project-based…

---

## [Constant tunable parameters in dynamic optimisation](https://discourse.julialang.org/t/constant-tunable-parameters-in-dynamic-optimisation/134774)

<div class="topic-metadata">

**Author:** [@PhysicsBender](https://discourse.julialang.org/u/PhysicsBender)\
**Replies:** 1\
**Last updated:** [December 28, 2025, 9:26pm UTC](https://discourse.julialang.org/t/constant-tunable-parameters-in-dynamic-optimisation/134774 "2025-12-28T21:26:43Z")

</div>

Hello , I was wondering what would be the best way to introduce a constant tunable parameter in a model that would be used in a dynamic optimisation scenario. I have a couple of working examples building on top the basic…

---

## [Modeling wind power output random process across multiple geographical locations](https://discourse.julialang.org/t/modeling-wind-power-output-random-process-across-multiple-geographical-locations/134529)

<div class="topic-metadata">

**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 13\
**Last updated:** [December 27, 2025, 9:44am UTC](https://discourse.julialang.org/t/modeling-wind-power-output-random-process-across-multiple-geographical-locations/134529 "2025-12-27T09:44:11Z")

</div>

Hello, I want to model a vector stochastic process (may be decided according to historical observations). The length of the vector is N, which is the number of wind farms spreading in a power transmission network. The…

---

## [Free final time problem formulation using ModelingToolkit and InfiniteOpt](https://discourse.julialang.org/t/free-final-time-problem-formulation-using-modelingtoolkit-and-infiniteopt/134735)

<div class="topic-metadata">

**Author:** [@PhysicsBender](https://discourse.julialang.org/u/PhysicsBender)\
**Replies:** 2\
**Last updated:** [December 26, 2025, 8:54am UTC](https://discourse.julialang.org/t/free-final-time-problem-formulation-using-modelingtoolkit-and-infiniteopt/134735 "2025-12-26T08:54:06Z")

</div>

Hello all, I am a new Julia user coming from a Modelica background and I am trying to experiment with Modeling Toolkit and dynamic optimisation. I was trying to follow this example (\[Solving Dynamic Optimization Proble…

---

## [Sure in julia](https://discourse.julialang.org/t/sure-in-julia/134728)

<div class="topic-metadata">

**Author:** [@Stephen](https://discourse.julialang.org/u/Stephen)\
**Replies:** 2\
**Last updated:** [December 25, 2025, 3:18am UTC](https://discourse.julialang.org/t/sure-in-julia/134728 "2025-12-25T03:18:51Z")

</div>

Is there a posibility to transform this personal finance app into julia？ Oxygen, Genie?

---

## [Error using Julia on an HPC cluster: Juliaup configuration is locked by another process, waiting for it to unlock](https://discourse.julialang.org/t/error-using-julia-on-an-hpc-cluster-juliaup-configuration-is-locked-by-another-process-waiting-for-it-to-unlock/118059)

<div class="topic-metadata">

**Author:** [@squark](https://discourse.julialang.org/u/squark)\
**Replies:** 3\
**Last updated:** [December 25, 2025, 12:55am UTC](https://discourse.julialang.org/t/error-using-julia-on-an-hpc-cluster-juliaup-configuration-is-locked-by-another-process-waiting-for-it-to-unlock/118059 "2025-12-25T00:55:40Z")

</div>

I have been using Julia on an HPC slurm cluster with no problem. However, I was trying to use the MPI.jl package to parallelize my code. The cluster has intel MPI that I have been trying to use without success. I added t…

---

## [\[ANN\] Dynare.jl is now ready for testing](https://discourse.julialang.org/t/ann-dynare-jl-is-now-ready-for-testing/108177)

<div class="topic-metadata">

**Author:** [@MichelJuillard](https://discourse.julialang.org/u/MichelJuillard)\
**Replies:** 14\
**Last updated:** [December 24, 2025, 9:37am UTC](https://discourse.julialang.org/t/ann-dynare-jl-is-now-ready-for-testing/108177 "2025-12-24T09:37:14Z")

</div>

Dynare.jl (GitHub - DynareJulia/Dynare.jl: A Julia rewrite of Dynare: solving, simulating and estimating DSGE models.), a Julia rewriting of Dynare, is now ready for testing by users. Dynare is a software for solving, …

---

## [Simpler Yin-Yang?](https://discourse.julialang.org/t/simpler-yin-yang/134696)

<div class="topic-metadata">

**Author:** [@tp2750](https://discourse.julialang.org/u/tp2750)\
**Replies:** 6\
**Last updated:** [December 24, 2025, 7:48am UTC](https://discourse.julialang.org/t/simpler-yin-yang/134696 "2025-12-24T07:48:08Z")

</div>

I wanted to draw the Yin-Yang symbol in Luxor.jl. Here’s what I came up with. Can this be done more idiomatic? I would have preferred the white “eye” of the black “fish” to be just a cut-out rather than over-plotting w…

---

## [2D stationary diffusion problem & (?) MethodOfLines](https://discourse.julialang.org/t/2d-stationary-diffusion-problem-methodoflines/118963)

<div class="topic-metadata">

**Author:** [@Eben60](https://discourse.julialang.org/u/Eben60)\
**Replies:** 12\
**Last updated:** [December 24, 2025, 6:23am UTC](https://discourse.julialang.org/t/2d-stationary-diffusion-problem-methodoflines/118963 "2025-12-24T06:23:02Z")

</div>

I’d like to model a mass exchanger which can be represented as diffusion in a fluid flow with given stationary flow field and given coordinate-dependent diffusion coefficient. 2D, rectangular domain, rectangular grid, st…

---

## [Will Reactant.jl become a machine learning framework?](https://discourse.julialang.org/t/will-reactant-jl-become-a-machine-learning-framework/125478)

<div class="topic-metadata">

**Author:** [@Tarny\_GG\_Channie](https://discourse.julialang.org/u/Tarny_GG_Channie)\
**Replies:** 16\
**Last updated:** [December 23, 2025, 8:55pm UTC](https://discourse.julialang.org/t/will-reactant-jl-become-a-machine-learning-framework/125478 "2025-12-23T20:55:00Z")

</div>

I made an observation that MLIR + Enzyme could form quite a capable ML framework, and then, well… like the last time I theorized about how a good language would work, and Julians were one step ahead of me, creating Julia…

---

## [Stochastic filtration problem](https://discourse.julialang.org/t/stochastic-filtration-problem/134713)

<div class="topic-metadata">

**Author:** [@ymuv1](https://discourse.julialang.org/u/ymuv1)\
**Replies:** 1\
**Last updated:** [December 23, 2025, 7:13pm UTC](https://discourse.julialang.org/t/stochastic-filtration-problem/134713 "2025-12-23T19:13:46Z")

</div>

Hi all, I’m working with a physical system whose state u(t) follows an SDE du=f(u,t)dt+g(u,t)dW\_t The system produces a measured signal Y\_t given by dY\_t = h(u,t)dt+dW\_t where dW\_t is the same Wiener increment in bo…

---

## [Dynare perfect foresight simulation - how do I access solution to endogenous variables?](https://discourse.julialang.org/t/dynare-perfect-foresight-simulation-how-do-i-access-solution-to-endogenous-variables/83905)

<div class="topic-metadata">

**Author:** [@geekbear](https://discourse.julialang.org/u/geekbear)\
**Replies:** 4\
**Last updated:** [December 23, 2025, 3:10pm UTC](https://discourse.julialang.org/t/dynare-perfect-foresight-simulation-how-do-i-access-solution-to-endogenous-variables/83905 "2025-12-23T15:10:51Z")

</div>

I ran the example1pf.mod from Dynare.jl on GitHub. I know output is stored in the .jld2 file in the “output” folder. But how do I actually access the solution to endogenous variables so that I can use them, e.g. plotting…

---

## [Makie theme with transparent background not working](https://discourse.julialang.org/t/makie-theme-with-transparent-background-not-working/134694)

<div class="topic-metadata">

**Author:** [@danieleavitabile](https://discourse.julialang.org/u/danieleavitabile)\
**Replies:** 5\
**Last updated:** [December 23, 2025, 10:22am UTC](https://discourse.julialang.org/t/makie-theme-with-transparent-background-not-working/134694 "2025-12-23T10:22:49Z")

</div>

I would like to set once and for all the background of my axes and figures to be transparent. I thought I could do that as a theme in Makie.jl. The following minimal code fails to produce a transparent background using …

---

## [How to set nan\_color in Makie volume plot](https://discourse.julialang.org/t/how-to-set-nan-color-in-makie-volume-plot/134698)

<div class="topic-metadata">

**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 0\
**Last updated:** [December 22, 2025, 10:25pm UTC](https://discourse.julialang.org/t/how-to-set-nan-color-in-makie-volume-plot/134698 "2025-12-22T22:25:06Z")

</div>

I want to set the nan\_color to :white or may be :green. How to do it? using GLMakie xmin, xmax, ymin, ymax, zmin, zmax = -3, 3, -3, 3, 1, 8; field = fill(NaN32, 50,50,50); fig = Figure() ax::LScene = LScene(fig\[1,1\]) vo…

---

## [PID sampling time in modelingtoolkit](https://discourse.julialang.org/t/pid-sampling-time-in-modelingtoolkit/134671)

<div class="topic-metadata">

**Author:** [@victor](https://discourse.julialang.org/u/victor)\
**Replies:** 3\
**Last updated:** [December 22, 2025, 4:36pm UTC](https://discourse.julialang.org/t/pid-sampling-time-in-modelingtoolkit/134671 "2025-12-22T16:36:06Z")

</div>

Hi. I’ve built a modelingtoolkit model to simulate my process system. It uses PID controllers, the issue is that the control system has a sampling time of 1s. This has a huge effect on the parameters for the controller a…

---

## [Discretised colors in 3D plot due to sampling](https://discourse.julialang.org/t/discretised-colors-in-3d-plot-due-to-sampling/134632)

<div class="topic-metadata">

**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 6\
**Last updated:** [December 20, 2025, 8:18pm UTC](https://discourse.julialang.org/t/discretised-colors-in-3d-plot-due-to-sampling/134632 "2025-12-20T20:18:09Z")

</div>

I am getting discrete/pixelated colors in 3D plot due to sampling in field variable in MWE code below. Why it is discretized and how to solve it? using GLMakie r = Float32\[1.677044, 1.8385518, 2.0156136, 2.2097273, 2.42…

---

## [Genomic Annotation Package?](https://discourse.julialang.org/t/genomic-annotation-package/98255)

<div class="topic-metadata">

**Author:** [@hkhalil](https://discourse.julialang.org/u/hkhalil)\
**Replies:** 3\
**Last updated:** [December 20, 2025, 3:39pm UTC](https://discourse.julialang.org/t/genomic-annotation-package/98255 "2025-12-20T15:39:20Z")

</div>

Hi everyone, I am new to Julia and BioJulia so this serves as an introduction as well! In my work, I make extensive use of R/Bioconductor and am excited to see the development of BioJulia and am looking to use Julia mor…

---

## [Overdispersed alternative to multinomial](https://discourse.julialang.org/t/overdispersed-alternative-to-multinomial/134533)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 2\
**Last updated:** [December 20, 2025, 3:27pm UTC](https://discourse.julialang.org/t/overdispersed-alternative-to-multinomial/134533 "2025-12-20T15:27:25Z")

</div>

I have a multilevel Bayesian model where (a\_i, b\_i, c\_i) = f(\\theta\_i) for each unit i = 1, \\dots, 1000, which are latent variables, f comes from a model. For each i, and j = 1, 2, 3, I observe (A\_{i,j}, B\_{i,j}, C\_{i,j…

---

## [Makie textbox. cut & paste](https://discourse.julialang.org/t/makie-textbox-cut-paste/104625)

<div class="topic-metadata">

**Author:** [@bjarthur](https://discourse.julialang.org/u/bjarthur)\
**Replies:** 4\
**Last updated:** [December 20, 2025, 8:11am UTC](https://discourse.julialang.org/t/makie-textbox-cut-paste/104625 "2025-12-20T08:11:42Z")

</div>

with GLMakie on a mac i can’t paste text into a Textbox. nor can i select text that’s already there so that i could subsequently copy or delete it. none of Textbox’s attributes give me hope that any of this is possible…

---

## [How to obtain the pvalues of the coefficients in GLM.jl?](https://discourse.julialang.org/t/how-to-obtain-the-pvalues-of-the-coefficients-in-glm-jl/9531)

<div class="topic-metadata">

**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 5\
**Last updated:** [December 19, 2025, 9:50pm UTC](https://discourse.julialang.org/t/how-to-obtain-the-pvalues-of-the-coefficients-in-glm-jl/9531 "2025-12-19T21:50:09Z")

</div>

I have fitted a model using DataFrames df = DataFrame( x = 2\*y + 1 + rand(100), y = rand(100) ) using GLM mdl = lm(@formula(y~x), df) now I can see the pvalues of the coefficients. How do I obtain the pvalues and s…

---

## [Problem with concurrent calls to HiGHS solver (via JuMP) on Windows](https://discourse.julialang.org/t/problem-with-concurrent-calls-to-highs-solver-via-jump-on-windows/134631)

<div class="topic-metadata">

**Author:** [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)\
**Replies:** 2\
**Last updated:** [December 18, 2025, 9:16pm UTC](https://discourse.julialang.org/t/problem-with-concurrent-calls-to-highs-solver-via-jump-on-windows/134631 "2025-12-18T21:16:43Z")

</div>

Hi, I wanted to report some crashes observed when solving concurrently (multi-thread) different LP problems via JuMP with HiGHS solver: EXCEPTION\_ACCESS\_VIOLATION dans HighsTaskExecutor… No crashes observed on Linu…

---

## [Sparse variables in JuMP](https://discourse.julialang.org/t/sparse-variables-in-jump/134630)

<div class="topic-metadata">

**Author:** [@Marc\_Sevaux](https://discourse.julialang.org/u/Marc_Sevaux)\
**Replies:** 2\
**Last updated:** [December 18, 2025, 7:56pm UTC](https://discourse.julialang.org/t/sparse-variables-in-jump/134630 "2025-12-18T19:56:19Z")

</div>

Hi all, I’m facing a nice large problem and I would like to reduce the model by creating only the needed variables. Is there anything close to: @variable(model, x\[u in 1:n, v in 1:n; if c\[u,v\] \> 0.0\], Bin) I get the …

---

## [Why Atomix.@atomic b\[\] += a\[i\] works and b\[\] = b\[\] + a\[i\] does not](https://discourse.julialang.org/t/why-atomix-atomic-b-a-i-works-and-b-b-a-i-does-not/134627)

<div class="topic-metadata">

**Author:** [@Tomas\_Pevny](https://discourse.julialang.org/u/Tomas_Pevny)\
**Replies:** 6\
**Last updated:** [December 18, 2025, 10:48am UTC](https://discourse.julialang.org/t/why-atomix-atomic-b-a-i-works-and-b-b-a-i-does-not/134627 "2025-12-18T10:48:02Z")

</div>

Hi all, I am updating my lecture on GPU programming and this year, I would like to have kernels written in CUDA.jl and KernelAbstractions.jl side by side. The idea is to show students, how GPU accelerators are similar a…

---

## [Makie - Unable to make colors cycle for new recipe](https://discourse.julialang.org/t/makie-unable-to-make-colors-cycle-for-new-recipe/134625)

<div class="topic-metadata">

**Author:** [@oskarhs](https://discourse.julialang.org/u/oskarhs)\
**Replies:** 0\
**Last updated:** [December 18, 2025, 6:59am UTC](https://discourse.julialang.org/t/makie-unable-to-make-colors-cycle-for-new-recipe/134625 "2025-12-18T06:59:11Z")

</div>

I am trying to define a new Makie recipe for a custom type, but I am not able to make the plot type cycle colors like normal Makie recipes such as lines or density do. After spending a few hours trying out different solu…

---

## [Eigenvectors with the most overlap with v](https://discourse.julialang.org/t/eigenvectors-with-the-most-overlap-with-v/134008)

<div class="topic-metadata">

**Author:** [@Nichola](https://discourse.julialang.org/u/Nichola)\
**Replies:** 7\
**Last updated:** [December 18, 2025, 1:39am UTC](https://discourse.julialang.org/t/eigenvectors-with-the-most-overlap-with-v/134008 "2025-12-18T01:39:40Z")

</div>

Given a sparse matrix M and a vector v, I would like to get the k eigenvectors of M that have the most overlap with v. Is there an efficient method for doing this with sparse matrices ? All sparse solvers I ran into tar…

[Previous page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=14)

[Next page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=16)