# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=29

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

**Page:** 30

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## [Makie: nonlinear color levels in Colorbar](https://discourse.julialang.org/t/makie-nonlinear-color-levels-in-colorbar/118056)

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**Author:** [@ryofurue](https://discourse.julialang.org/u/ryofurue)\
**Replies:** 5\
**Last updated:** [August 18, 2025, 1:44am UTC](https://discourse.julialang.org/t/makie-nonlinear-color-levels-in-colorbar/118056 "2025-08-18T01:44:13Z")

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In a contourf map, I sometimes need to show the structure of the field at small absolute values as well as showing large absolute values. At the same time, I’d like to enable the reader to “read” approximate values off …

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## [Sequence language models in Julia](https://discourse.julialang.org/t/sequence-language-models-in-julia/130306)

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**Author:** [@Tomas\_Pevny](https://discourse.julialang.org/u/Tomas_Pevny)\
**Replies:** 6\
**Last updated:** [August 18, 2025, 1:26am UTC](https://discourse.julialang.org/t/sequence-language-models-in-julia/130306 "2025-08-18T01:26:26Z")

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Dear All, has anyone implemented / ported sequence models like Mamba, Hyena, S4 / S5 to Julia? I would be interested especially in already trained models. Thanks a lot for answer in advance. Tomas

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## [How to set width of VegaLite.jl Plot at time of image saving?](https://discourse.julialang.org/t/how-to-set-width-of-vegalite-jl-plot-at-time-of-image-saving/131648)

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**Author:** [@Alex1](https://discourse.julialang.org/u/Alex1)\
**Replies:** 0\
**Last updated:** [August 17, 2025, 4:35am UTC](https://discourse.julialang.org/t/how-to-set-width-of-vegalite-jl-plot-at-time-of-image-saving/131648 "2025-08-17T04:35:34Z")

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Hi, is there a way to set image width for VegaLite.jl at the time of image saving? And maintaining the default chart ratio (sometimes when I set width the ratio is changed)? using DataFrames, VegaLite, JSON # Plotting…

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## [Empty contour3d plot of Mesh](https://discourse.julialang.org/t/empty-contour3d-plot-of-mesh/131604)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 6\
**Last updated:** [August 16, 2025, 12:19pm UTC](https://discourse.julialang.org/t/empty-contour3d-plot-of-mesh/131604 "2025-08-16T12:19:57Z")

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I want to get 3d contour plot of V values but i got empty plot. Here r, θ and ϕ are in spherical coordinates. I convert them to Cartessian coordinates X,Y and Z. using GLMakie f= Figure(size = (1000, 800)) ax = Axis3(f\[…

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## [Running Cplex.jl on HPC cluster](https://discourse.julialang.org/t/running-cplex-jl-on-hpc-cluster/131601)

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**Author:** [@Ely](https://discourse.julialang.org/u/Ely)\
**Replies:** 2\
**Last updated:** [August 16, 2025, 4:43am UTC](https://discourse.julialang.org/t/running-cplex-jl-on-hpc-cluster/131601 "2025-08-16T04:43:16Z")

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Hi everyone, Any idea please why my julia script on HPC can’t build or add the cplex package on the hpc cluster ? If i already have the Cplex path on the server, how can i properly export it in my sh (bash) file ? Th…

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## [Fitting Distributions](https://discourse.julialang.org/t/fitting-distributions/131608)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 8\
**Last updated:** [August 15, 2025, 11:19am UTC](https://discourse.julialang.org/t/fitting-distributions/131608 "2025-08-15T11:19:48Z")

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Hello everyone, I have a task to determine which distribution corresponds to the probability density function constructed from my data. To address this, I use the KS-test for distributions that I consider somewhat sim…

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## [I heard lux.jl is moving to reactant.jl. Where can I help?](https://discourse.julialang.org/t/i-heard-lux-jl-is-moving-to-reactant-jl-where-can-i-help/131625)

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**Author:** [@Tarny\_GG\_Channie](https://discourse.julialang.org/u/Tarny_GG_Channie)\
**Replies:** 4\
**Last updated:** [August 15, 2025, 8:43am UTC](https://discourse.julialang.org/t/i-heard-lux-jl-is-moving-to-reactant-jl-where-can-i-help/131625 "2025-08-15T08:43:05Z")

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I heard lux.jl is moving to reactant.jl. Personally, that’s a really good news. Not only would it probably be something actionable for me (like implementing machine learning layers), it could also help me get closer to r…

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## [Different results when using 1 and 1.0 in expression](https://discourse.julialang.org/t/different-results-when-using-1-and-1-0-in-expression/131617)

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**Author:** [@jogama](https://discourse.julialang.org/u/jogama)\
**Replies:** 7\
**Last updated:** [August 14, 2025, 9:38pm UTC](https://discourse.julialang.org/t/different-results-when-using-1-and-1-0-in-expression/131617 "2025-08-14T21:38:19Z")

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d = (1+0im, 1.0+0im) (sqrt(exp(-d\[1\]) - 1), sqrt(exp(-d\[2\]) - 1)) (0.0 + 0.7950600976206501im, 0.0 - 0.7950600976206501im) also d = (1+0im, 1.0+0im); (sqrt(exp(-d\[1\]) - 1.0), …

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## [Time-series in Julia (working list)](https://discourse.julialang.org/t/time-series-in-julia-working-list/62539)

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**Author:** [@Albert\_Zevelev](https://discourse.julialang.org/u/Albert_Zevelev)\
**Replies:** 41\
**Last updated:** [August 14, 2025, 12:14pm UTC](https://discourse.julialang.org/t/time-series-in-julia-working-list/62539 "2025-08-14T12:14:28Z")

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Here is a summary of time series in Julia. (Ported from this thread.) This is a Julia version of CRAN Task View: Time Series Analysis . TL;DR ARCHModels is the most developed volatility model pkg in Julia (it also…

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## [\[ANN\] New version for CameraCalibrations](https://discourse.julialang.org/t/ann-new-version-for-cameracalibrations/131603)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 0\
**Last updated:** [August 14, 2025, 11:57am UTC](https://discourse.julialang.org/t/ann-new-version-for-cameracalibrations/131603 "2025-08-14T11:57:04Z")

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I’m happy to share that CameraCalibrations.jl, a Julia package for camera calibration, no longer relies on cv2 via PythonCall. Instead, it now directly uses OpenCV.jl for both checkerboard detection and camera model fitt…

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## [HiGHS multi-objective optimization stuck in infinite loop](https://discourse.julialang.org/t/highs-multi-objective-optimization-stuck-in-infinite-loop/131559)

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**Author:** [@BdeKoning](https://discourse.julialang.org/u/BdeKoning)\
**Replies:** 8\
**Last updated:** [August 14, 2025, 12:13am UTC](https://discourse.julialang.org/t/highs-multi-objective-optimization-stuck-in-infinite-loop/131559 "2025-08-14T00:13:07Z")

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I’m refactoring my code to go from custom multi objective optimization to using MultiObjectiveAlgorithms.jl with Lexicographic. When I run my optimization it never stops, with this repeated log message: So it looks l…

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## [Metal.jl does not speed up FFT](https://discourse.julialang.org/t/metal-jl-does-not-speed-up-fft/95528)

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**Author:** [@huangc](https://discourse.julialang.org/u/huangc)\
**Replies:** 8\
**Last updated:** [August 13, 2025, 10:48pm UTC](https://discourse.julialang.org/t/metal-jl-does-not-speed-up-fft/95528 "2025-08-13T22:48:55Z")

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I was hoping to explore the possibility of using Metal.jl to speed up Fourier transfer without needing to copy between CPU and GPU. However, my benchmark results showed no improvement in speed which makes me suspect that…

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## [How to disable print-outs when plotting (for \`savefig\` on e.g. hpc)](https://discourse.julialang.org/t/how-to-disable-print-outs-when-plotting-for-savefig-on-e-g-hpc/131592)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 0\
**Last updated:** [August 13, 2025, 5:27pm UTC](https://discourse.julialang.org/t/how-to-disable-print-outs-when-plotting-for-savefig-on-e-g-hpc/131592 "2025-08-13T17:27:21Z")

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I am running some code on a hpc server (both interactively in the terminal and using slurm). As part of the process I am getting print outs like qt.qpa.xcb: could not connect to display localhost:13.0 qt.qpa.plugin: Fro…

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## [Can we solve complex valued two point boundary value problems?](https://discourse.julialang.org/t/can-we-solve-complex-valued-two-point-boundary-value-problems/53232)

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**Author:** [@406700](https://discourse.julialang.org/u/406700)\
**Replies:** 12\
**Last updated:** [August 13, 2025, 5:13pm UTC](https://discourse.julialang.org/t/can-we-solve-complex-valued-two-point-boundary-value-problems/53232 "2025-08-13T17:13:25Z")

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Hi, I am new to using Julia for differential equations. I am having a problem trying to solve a complex valued two point boundary value problem using the MIRK4 solver. I have tried to define complex valued initial condi…

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## [Comparing distribution with KS-test](https://discourse.julialang.org/t/comparing-distribution-with-ks-test/131589)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 1\
**Last updated:** [August 13, 2025, 4:53pm UTC](https://discourse.julialang.org/t/comparing-distribution-with-ks-test/131589 "2025-08-13T16:53:24Z")

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Hello all! I have a vector of local maximum spikes extracted from a time series. I also have the probability density function (PDF) for these local maxima. I need to compare my distribution with the Weibull distributio…

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## [Colorbar of a Contour Plot](https://discourse.julialang.org/t/colorbar-of-a-contour-plot/131566)

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**Author:** [@prconlin](https://discourse.julialang.org/u/prconlin)\
**Replies:** 3\
**Last updated:** [August 12, 2025, 7:02pm UTC](https://discourse.julialang.org/t/colorbar-of-a-contour-plot/131566 "2025-08-12T19:02:18Z")

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Hello, I have a matrix of discrete values, and I would like to plot it as a contour plot instead of a heatmap, because reasons. This works well enough, except that the colorbar is strange and I can’t find a way to corr…

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## [UndefVarError: cuda\_version in Google Colab with CUDA.jl](https://discourse.julialang.org/t/undefvarerror-cuda-version-in-google-colab-with-cuda-jl/131557)

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**Author:** [@rrabadan](https://discourse.julialang.org/u/rrabadan)\
**Replies:** 2\
**Last updated:** [August 12, 2025, 11:57am UTC](https://discourse.julialang.org/t/undefvarerror-cuda-version-in-google-colab-with-cuda-jl/131557 "2025-08-12T11:57:03Z")

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Hello, I’m working in a Google Colab notebook with a GPU runtime and am running into UndefVarError when trying to use CUDA.jl. For instance when I run CUDA.versioninfo(): using CUDA CUDA.versioninfo() I get the follow…

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## [PI Controller oscillating between limit values](https://discourse.julialang.org/t/pi-controller-oscillating-between-limit-values/131510)

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**Author:** [@madtorresga](https://discourse.julialang.org/u/madtorresga)\
**Replies:** 4\
**Last updated:** [August 12, 2025, 5:01am UTC](https://discourse.julialang.org/t/pi-controller-oscillating-between-limit-values/131510 "2025-08-12T05:01:23Z")

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Hello, I’m trying to implement a PI controller that turns on once the cell goes out of the voltage limits. My model looks something like this: @mtkmodel Cell begin ... @components begin ... deadzone = DeadZ…

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## [Recording data from model\_step in Agents.jl](https://discourse.julialang.org/t/recording-data-from-model-step-in-agents-jl/131543)

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**Author:** [@geoffD](https://discourse.julialang.org/u/geoffD)\
**Replies:** 0\
**Last updated:** [August 12, 2025, 3:05am UTC](https://discourse.julialang.org/t/recording-data-from-model-step-in-agents-jl/131543 "2025-08-12T03:05:25Z")

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Hi, I am trying to increment a few pieces of data on every model step in Agents.jl. Data are structured as Dict entries. The code appears to be incrementing appropriately when I examine the values from within model\_step!…

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## [NonlinearSolve: how to pass parameters including a mutable workspace array](https://discourse.julialang.org/t/nonlinearsolve-how-to-pass-parameters-including-a-mutable-workspace-array/131421)

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**Author:** [@Audrius-St](https://discourse.julialang.org/u/Audrius-St)\
**Replies:** 5\
**Last updated:** [August 10, 2025, 8:00am UTC](https://discourse.julialang.org/t/nonlinearsolve-how-to-pass-parameters-including-a-mutable-workspace-array/131421 "2025-08-10T08:00:06Z")

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I would like to solve a 1D equation using NonlinearSolve. Appended below is a toy MNWE followed by the error message generated. The issue I’m encountering is that in the actual problem I need to pass a workspace array w…

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## [Solving linear system without allocating](https://discourse.julialang.org/t/solving-linear-system-without-allocating/130300)

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**Author:** [@freeman](https://discourse.julialang.org/u/freeman)\
**Replies:** 19\
**Last updated:** [August 9, 2025, 11:34pm UTC](https://discourse.julialang.org/t/solving-linear-system-without-allocating/130300 "2025-08-09T23:34:14Z")

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First off, this isn’t advanced stuff, conceptually it should be straightforward. I’m almost sure this is just me missing something basic. So I’m implementing an algorithm which is just a sequence of matrix multiplicatio…

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## [Combining \`Optim\` and \`FieldVector\` from \`StaticArrays\`](https://discourse.julialang.org/t/combining-optim-and-fieldvector-from-staticarrays/131472)

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**Author:** [@NoFishLikeIan](https://discourse.julialang.org/u/NoFishLikeIan)\
**Replies:** 3\
**Last updated:** [August 9, 2025, 10:15am UTC](https://discourse.julialang.org/t/combining-optim-and-fieldvector-from-staticarrays/131472 "2025-08-09T10:15:56Z")

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I’m getting a MethodError in LBFGS when trying to use a custom mutable struct that inherits from FieldVector for an optimization problem. using StaticArrays using Optimization, OptimizationOptimJL mutable struct Point{…

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## [\[NEW BOOK\] Geospatial Data Science with Julia](https://discourse.julialang.org/t/new-book-geospatial-data-science-with-julia/103364)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 13\
**Last updated:** [August 8, 2025, 12:15pm UTC](https://discourse.julialang.org/t/new-book-geospatial-data-science-with-julia/103364 "2025-08-08T12:15:13Z")

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The book will be published soon, and will contain practical applications of the framework we built over the years. If you would like to see an application in a specific area (e.g., agriculture, groundwater, environmen…

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## [\[ANN\] ModelingToolkitTolerances.jl](https://discourse.julialang.org/t/ann-modelingtoolkittolerances-jl/131460)

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**Author:** [@Brad\_Carman](https://discourse.julialang.org/u/Brad_Carman)\
**Replies:** 2\
**Last updated:** [August 8, 2025, 11:24am UTC](https://discourse.julialang.org/t/ann-modelingtoolkittolerances-jl/131460 "2025-08-08T11:24:41Z")

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Very happy to announce a new package I’ve been working on to help debug ModelingToolkit.jl models. Using the power of Julia’s autodiff and the symbolics in ModelingToolkit.jl, it’s possible to estimate the error (or r…

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## [How to implement Value Suppressing Colormaps in Makie](https://discourse.julialang.org/t/how-to-implement-value-suppressing-colormaps-in-makie/129140)

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**Author:** [@vladdez](https://discourse.julialang.org/u/vladdez)\
**Replies:** 11\
**Last updated:** [August 7, 2025, 9:15am UTC](https://discourse.julialang.org/t/how-to-implement-value-suppressing-colormaps-in-makie/129140 "2025-08-07T09:15:50Z")

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I would like to implement Value Suppressing Colormap described in this paper https://dl.acm.org/doi/abs/10.1145/3173574.3174216 Which requires: triangular colorbar bivariate colormap, where I can manipulate color h…

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## [Downgrading NonlinearExpr to QuadExpr or AffExpr](https://discourse.julialang.org/t/downgrading-nonlinearexpr-to-quadexpr-or-affexpr/131462)

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**Author:** [@brunompacheco](https://discourse.julialang.org/u/brunompacheco)\
**Replies:** 6\
**Last updated:** [August 8, 2025, 3:14am UTC](https://discourse.julialang.org/t/downgrading-nonlinearexpr-to-quadexpr-or-affexpr/131462 "2025-08-08T03:14:48Z")

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Hi! My question is related to Evaluating nonlinear expressions with variable references · Issue #4044 · jump-dev/JuMP.jl · GitHub TL;DR: I want to take a JuMP expression and replace some of the VariableRef by numerical…

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## [Using getrf\_batched to find matrix inverses](https://discourse.julialang.org/t/using-getrf-batched-to-find-matrix-inverses/131449)

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**Author:** [@JackC](https://discourse.julialang.org/u/JackC)\
**Replies:** 2\
**Last updated:** [August 7, 2025, 3:45pm UTC](https://discourse.julialang.org/t/using-getrf-batched-to-find-matrix-inverses/131449 "2025-08-07T15:45:55Z")

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Hello, I am pretty new to GPU programming in general, so apologies in advanced for sounding clueless. I have a problem where I need to find the inverses of a bunch of relatively small matrices on a GPU using LU factoriz…

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## [Adding a plot onto a heatmap with scale squeezes it in Plots.jl](https://discourse.julialang.org/t/adding-a-plot-onto-a-heatmap-with-scale-squeezes-it-in-plots-jl/131439)

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**Author:** [@Gako](https://discourse.julialang.org/u/Gako)\
**Replies:** 2\
**Last updated:** [August 7, 2025, 11:50am UTC](https://discourse.julialang.org/t/adding-a-plot-onto-a-heatmap-with-scale-squeezes-it-in-plots-jl/131439 "2025-08-07T11:50:55Z")

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I want to add a reference line to a heatmap and am currently doing it as follows: using Plots plot1 = heatmap(1:100, 1:100, rand(100, 100), scale=:log10) plot!(plot1, 1:100, ones(100) .\* 4, label="") This works but som…

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## [CI integration failed with Gurobi.jl in environment](https://discourse.julialang.org/t/ci-integration-failed-with-gurobi-jl-in-environment/126236)

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**Author:** [@Betristor](https://discourse.julialang.org/u/Betristor)\
**Replies:** 13\
**Last updated:** [August 7, 2025, 8:40am UTC](https://discourse.julialang.org/t/ci-integration-failed-with-gurobi-jl-in-environment/126236 "2025-08-07T08:40:01Z")

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I have a Julia package in development which has Gurobi.jl in environment as an available solver. Somehow, the github CI integration is against the Gurobi.jl pre-compilation since no license could be found on github actio…

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## [How do I set up Gurobi solver for JuMP with Web License Service (WLS) license?](https://discourse.julialang.org/t/how-do-i-set-up-gurobi-solver-for-jump-with-web-license-service-wls-license/131409)

<div class="topic-metadata">

**Author:** [@leonie25](https://discourse.julialang.org/u/leonie25)\
**Replies:** 6\
**Last updated:** [August 7, 2025, 2:20am UTC](https://discourse.julialang.org/t/how-do-i-set-up-gurobi-solver-for-jump-with-web-license-service-wls-license/131409 "2025-08-07T02:20:22Z")

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How do I set up Gurobi solver for JuMP with Web License Service (WLS) license?

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