# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=130

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**Page:** 131

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## [Minimizing a logsumexp function with many terms (Convex.jl)](https://discourse.julialang.org/t/minimizing-a-logsumexp-function-with-many-terms-convex-jl/110853)

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**Author:** [@leapsheep](https://discourse.julialang.org/u/leapsheep)\
**Replies:** 11\
**Last updated:** [February 29, 2024, 6:02pm UTC](https://discourse.julialang.org/t/minimizing-a-logsumexp-function-with-many-terms-convex-jl/110853 "2024-02-29T18:02:26Z")

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I am trying to minimize a function that depends on only few parameters, but contains a logsumexp with many terms in the sum, i.e. a function of the form f(x) = \\log \\left(\\sum\_{i=1}^n e^{a\_i \\cdot x}\\right) where where…

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## [List of supported fluids in Clapeyron.jl](https://discourse.julialang.org/t/list-of-supported-fluids-in-clapeyron-jl/110903)

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**Author:** [@Sushrut\_Deshpande](https://discourse.julialang.org/u/Sushrut_Deshpande)\
**Replies:** 4\
**Last updated:** [February 29, 2024, 5:04pm UTC](https://discourse.julialang.org/t/list-of-supported-fluids-in-clapeyron-jl/110903 "2024-02-29T17:04:11Z")

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Hello, I am trying to use the Clapeyron.jl package for Thermodynamic properties. My question: is there an available list of the fluids that is supported by default?

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## [DuckDB.jl and S3?](https://discourse.julialang.org/t/duckdb-jl-and-s3/98738)

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**Author:** [@StatisticalMouse](https://discourse.julialang.org/u/StatisticalMouse)\
**Replies:** 13\
**Last updated:** [February 29, 2024, 4:58pm UTC](https://discourse.julialang.org/t/duckdb-jl-and-s3/98738 "2024-02-29T16:58:49Z")

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I noticed to my delight that there is a DuckDB.jl package for DuckDB. I now want to read in some Parquet data from an in-house S3 storage. According to the documentation I need the httpfs extension for DuckDB, but how s…

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## [Making Custom Colormap with Makie](https://discourse.julialang.org/t/making-custom-colormap-with-makie/110965)

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**Author:** [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)\
**Replies:** 0\
**Last updated:** [February 29, 2024, 4:40pm UTC](https://discourse.julialang.org/t/making-custom-colormap-with-makie/110965 "2024-02-29T16:40:00Z")

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Hello, I’m wondering what is the best way to implement my own custom colormap for use in Makie. I am using CairoMakie to generate plots and I want to be able to specify a colormap and then generate smaller maps from tho…

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## [Bifurcation diagram DynamicalSystems.jl](https://discourse.julialang.org/t/bifurcation-diagram-dynamicalsystems-jl/110951)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 0\
**Last updated:** [February 29, 2024, 1:18pm UTC](https://discourse.julialang.org/t/bifurcation-diagram-dynamicalsystems-jl/110951 "2024-02-29T13:18:42Z")

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Hello, I got this error after two hours of calculation ArgumentError: The interval \[a,b\] is not a bracketing interval. You need f(a) and f(b) to have different signs (f(a) \* f(b) \< 0). Consider a different bracket or tr…

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## [Retrieve UserCuts' slack for sensitivity analysis](https://discourse.julialang.org/t/retrieve-usercuts-slack-for-sensitivity-analysis/110782)

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**Author:** [@abreualexp](https://discourse.julialang.org/u/abreualexp)\
**Replies:** 4\
**Last updated:** [February 29, 2024, 11:50am UTC](https://discourse.julialang.org/t/retrieve-usercuts-slack-for-sensitivity-analysis/110782 "2024-02-29T11:50:35Z")

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Settings: Julia 1.8, JuMP 1.13.0, Gurobi.jl 1.0.2 I have been trying to check which type of cuts that I included through callbacks are still active. As shown in Gurobi’s log, the initial formulation has 9010 constrain…

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## [CUDA.jl for particle tracking simulation](https://discourse.julialang.org/t/cuda-jl-for-particle-tracking-simulation/110906)

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**Author:** [@VitorSouzaLNLS](https://discourse.julialang.org/u/VitorSouzaLNLS)\
**Replies:** 4\
**Last updated:** [February 29, 2024, 10:40am UTC](https://discourse.julialang.org/t/cuda-jl-for-particle-tracking-simulation/110906 "2024-02-29T10:40:35Z")

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Im trying to implement some consolidated CPU functions for particle tracking simulations (models of synchrotron accelerators) in GPU using CUDA.jl. The goal is to be able to paralelize tracking routines. I had tried to …

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## [What is a good way of applying constraints "incrementally"?](https://discourse.julialang.org/t/what-is-a-good-way-of-applying-constraints-incrementally/110890)

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**Author:** [@mrys](https://discourse.julialang.org/u/mrys)\
**Replies:** 4\
**Last updated:** [February 29, 2024, 9:08am UTC](https://discourse.julialang.org/t/what-is-a-good-way-of-applying-constraints-incrementally/110890 "2024-02-29T09:08:04Z")

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Let say I have the following problem to solve: x\_old = zeros(\_ndofs) for i in 1:10 func(x) = f(x, x\_old) model = Model(Ipopt.Optimizer) @variable(model, x\[1:\_ndofs\]) @objective(…

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## [Forward differentiation and differential equations](https://discourse.julialang.org/t/forward-differentiation-and-differential-equations/21002)

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**Author:** [@moesphere](https://discourse.julialang.org/u/moesphere)\
**Replies:** 13\
**Last updated:** [November 7, 2023, 9:01am UTC](https://discourse.julialang.org/t/forward-differentiation-and-differential-equations/21002 "2023-11-07T09:01:46Z")

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I am trying to use forward AD in combination with solving an ODE using DifferentialEquations.jl. I want to use an own loss function. However, with the is-in-place version there is a type assertion error. I have come up w…

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## [Modeling Step function in ODEs](https://discourse.julialang.org/t/modeling-step-function-in-odes/110313)

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**Author:** [@Nick1](https://discourse.julialang.org/u/Nick1)\
**Replies:** 4\
**Last updated:** [February 29, 2024, 12:07am UTC](https://discourse.julialang.org/t/modeling-step-function-in-odes/110313 "2024-02-29T00:07:32Z")

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Hi, I am modeling a stimulus that lasts for a certain amount of time. The way I model it is with a set of callback functions, e.g. ton = 0.0; toff = 2.0; stim = 10.0; function condition1(u, t, integrator) t\>=ton &&…

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## [How to access values of JuMP variables during optimization](https://discourse.julialang.org/t/how-to-access-values-of-jump-variables-during-optimization/110914)

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**Author:** [@structural](https://discourse.julialang.org/u/structural)\
**Replies:** 7\
**Last updated:** [February 28, 2024, 8:39pm UTC](https://discourse.julialang.org/t/how-to-access-values-of-jump-variables-during-optimization/110914 "2024-02-28T20:39:49Z")

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Is there a way to access values of JuMP variables during the optimization? I need to use JuMP for a constrained optimization. At each iteration of the optimization, I need to access the values of the parameters (i.e., v…

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## [Is there a way to change a single parameter in am ODEproblem and rerun it?](https://discourse.julialang.org/t/is-there-a-way-to-change-a-single-parameter-in-am-odeproblem-and-rerun-it/86775)

<div class="topic-metadata">

**Author:** [@TS-CUBED](https://discourse.julialang.org/u/TS-CUBED)\
**Replies:** 15\
**Last updated:** [February 28, 2024, 8:30pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-change-a-single-parameter-in-am-odeproblem-and-rerun-it/86775 "2024-02-28T20:30:57Z")

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I do define a model with a set of parameters that comes from the default settings for the components. I then want to change a parameter and rerun the problem. I could of course set up a parameter input map p = \[ p1 =\> …

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## [GPU problems with RecursiveArrayTools](https://discourse.julialang.org/t/gpu-problems-with-recursivearraytools/110830)

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**Author:** [@agelgazzar](https://discourse.julialang.org/u/agelgazzar)\
**Replies:** 1\
**Last updated:** [February 28, 2024, 8:25pm UTC](https://discourse.julialang.org/t/gpu-problems-with-recursivearraytools/110830 "2024-02-28T20:25:29Z")

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Hi, I have an system of ODEs where the state is an array of arrays. I want to be able to solve my ODE on the gpu. I am using ArrayPartition where each array is an CuArray. However, I get the scalar indexing error. The co…

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## [Converting/Reshaping a vector of ArrayPartition to an Array on the gpu](https://discourse.julialang.org/t/converting-reshaping-a-vector-of-arraypartition-to-an-array-on-the-gpu/110842)

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**Author:** [@agelgazzar](https://discourse.julialang.org/u/agelgazzar)\
**Replies:** 1\
**Last updated:** [February 28, 2024, 7:50pm UTC](https://discourse.julialang.org/t/converting-reshaping-a-vector-of-arraypartition-to-an-array-on-the-gpu/110842 "2024-02-28T19:50:30Z")

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I have a vector ArrayPartition that looks like this: 5-element Vector{ArrayPartition{Float32, Tuple{CuArray{Float32, 2, CUDA.Mem.DeviceBuffer}, CuArray{Float32, 2, CUDA.Mem.DeviceBuffer}}}} I want to reshape this into …

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## [A Julia DSL for language models](https://discourse.julialang.org/t/a-julia-dsl-for-language-models/110244)

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**Author:** [@cpfiffer](https://discourse.julialang.org/u/cpfiffer)\
**Replies:** 14\
**Last updated:** [February 28, 2024, 2:51pm UTC](https://discourse.julialang.org/t/a-julia-dsl-for-language-models/110244 "2024-02-28T14:51:57Z")

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@svilupp and I were talking on the Slack about what a DSL might look like for generative models. I wanted to stick this on the forum for a more sticky conversational place, so I hope this can serve as kind of an evolving…

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## [Writing ROOT Tree from Julia](https://discourse.julialang.org/t/writing-root-tree-from-julia/110902)

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**Author:** [@grasph](https://discourse.julialang.org/u/grasph)\
**Replies:** 0\
**Last updated:** [February 28, 2024, 2:27pm UTC](https://discourse.julialang.org/t/writing-root-tree-from-julia/110902 "2024-02-28T14:27:41Z")

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Hello, At the JuliaHEP workshop of last November the need for ROOT Tree write support in Julia using a binding to ROOT libraries was identified. TTree writing from Julia is now possible ! The ROOT wrapper example ship…

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## [Extracting coordinates from Shape File](https://discourse.julialang.org/t/extracting-coordinates-from-shape-file/67799)

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**Author:** [@Dieter](https://discourse.julialang.org/u/Dieter)\
**Replies:** 8\
**Last updated:** [February 28, 2024, 12:54pm UTC](https://discourse.julialang.org/t/extracting-coordinates-from-shape-file/67799 "2024-02-28T12:54:05Z")

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Hi Community I tried to read in a Shape File with Austrian Boarders typing julia\> A=Shapefile.Table(Path\_Shapefile) Shapefile.Table{Union{Missing, Shapefile.Polygon}} with 1 rows and the following 16 columns: geometry…

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## [Export GeoTable to common GIS format and CRS projection](https://discourse.julialang.org/t/export-geotable-to-common-gis-format-and-crs-projection/88408)

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**Author:** [@ErickChacon](https://discourse.julialang.org/u/ErickChacon)\
**Replies:** 16\
**Last updated:** [February 28, 2024, 12:53pm UTC](https://discourse.julialang.org/t/export-geotable-to-common-gis-format-and-crs-projection/88408 "2024-02-28T12:53:30Z")

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I love working with Meshes.jl and GeoTables.jl. I would like to be able to export a GeoTable object to a standard GIS format (e.g. shapfile, gpkg, so on) so my collaborators can handle the results of my analysis. What…

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## [Accessing x, y values in a geopackage](https://discourse.julialang.org/t/accessing-x-y-values-in-a-geopackage/103196)

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**Author:** [@chadagreene](https://discourse.julialang.org/u/chadagreene)\
**Replies:** 18\
**Last updated:** [February 28, 2024, 12:50pm UTC](https://discourse.julialang.org/t/accessing-x-y-values-in-a-geopackage/103196 "2024-02-28T12:50:59Z")

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Basic question: I can load a geopackage with: using GeoTables table = GeoTables.load("myfile.gpkg") Now how do I access the x, y values in the table?

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## [Zygote with Tullio gives wrong gradients/pullbacks using CUDA](https://discourse.julialang.org/t/zygote-with-tullio-gives-wrong-gradients-pullbacks-using-cuda/110767)

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**Author:** [@kcqpo](https://discourse.julialang.org/u/kcqpo)\
**Replies:** 1\
**Last updated:** [February 26, 2024, 2:01pm UTC](https://discourse.julialang.org/t/zygote-with-tullio-gives-wrong-gradients-pullbacks-using-cuda/110767 "2024-02-26T14:01:55Z")

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using Tullio, Zygote, CUDA, KernelAbstractions, OMEinsum # Show outer product of strings A = \["x", "y", "z", "w"\] res = Array{String}(undef, length(A), length(A)) for (i, r) in enumerate(A) for (j, c) in enumerate(A…

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## [Coloring regions defined with path in Luxor](https://discourse.julialang.org/t/coloring-regions-defined-with-path-in-luxor/110863)

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**Author:** [@Janis\_Erdmanis](https://discourse.julialang.org/u/Janis_Erdmanis)\
**Replies:** 1\
**Last updated:** [February 28, 2024, 12:31am UTC](https://discourse.julialang.org/t/coloring-regions-defined-with-path-in-luxor/110863 "2024-02-28T00:31:33Z")

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I am working on a new logo for the PeaceFounder project and giving Luxor a chance. So far, I have managed to get a frame in the way I want it to be (representing two interlinked elements in a rope): which is achieved…

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## [Efficient ways to implement a (distributed) matrix-matrix product?](https://discourse.julialang.org/t/efficient-ways-to-implement-a-distributed-matrix-matrix-product/79466)

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**Author:** [@Neo](https://discourse.julialang.org/u/Neo)\
**Replies:** 2\
**Last updated:** [February 27, 2024, 4:30pm UTC](https://discourse.julialang.org/t/efficient-ways-to-implement-a-distributed-matrix-matrix-product/79466 "2024-02-27T16:30:46Z")

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There are a huge sparse matrix A and a tall-and-skinny matrix B (a set of multiple vectors). I want partition them into pieces for parallel distributed-memory matrix-matrix (matrix-vectors) multiplication. Is there any w…

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## [Y-axis in CairoMakie.jl not vertical](https://discourse.julialang.org/t/y-axis-in-cairomakie-jl-not-vertical/93165)

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**Author:** [@mgp](https://discourse.julialang.org/u/mgp)\
**Replies:** 4\
**Last updated:** [February 27, 2024, 3:32pm UTC](https://discourse.julialang.org/t/y-axis-in-cairomakie-jl-not-vertical/93165 "2024-02-27T15:32:17Z")

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I am making plots in CairoMakie.jl (v0.10.1) and noticed that the y-axis isn’t quite vertical. It generally looks less tidy than the x-axis. using CairoMakie CairoMakie.activate!() xs = rand(100); ys = rand(100) fig, a…

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## [Tutorial: Deploying an Oxygen.jl app to Microsoft Azure](https://discourse.julialang.org/t/tutorial-deploying-an-oxygen-jl-app-to-microsoft-azure/107595)

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**Author:** [@Snowy](https://discourse.julialang.org/u/Snowy)\
**Replies:** 4\
**Last updated:** [February 27, 2024, 1:06pm UTC](https://discourse.julialang.org/t/tutorial-deploying-an-oxygen-jl-app-to-microsoft-azure/107595 "2024-02-27T13:06:59Z")

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Hi everyone, I’ve recently been working on a web app in Julia and wanted to share what I’ve learned as it may help those in the future. In particular, deploying an API is a new skill for me and so I thought I’d help out…

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## [Deep learning with Flux.jl and gumbel-softmax trick](https://discourse.julialang.org/t/deep-learning-with-flux-jl-and-gumbel-softmax-trick/110810)

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**Author:** [@Flavio\_Barros](https://discourse.julialang.org/u/Flavio_Barros)\
**Replies:** 2\
**Last updated:** [February 27, 2024, 12:48pm UTC](https://discourse.julialang.org/t/deep-learning-with-flux-jl-and-gumbel-softmax-trick/110810 "2024-02-27T12:48:05Z")

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I am new to Julia, but I’m evaluating Flux.jl as an option to implement a Variational Autoencoder (VAE). But, unfortunately, I’m not finding an example using the gumbel-softmax trick. I found on Pytorch, but I wonder how…

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## [DiffEqCallback and quadrature calculation with IntegratingCallback](https://discourse.julialang.org/t/diffeqcallback-and-quadrature-calculation-with-integratingcallback/110836)

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**Author:** [@a6a3uh](https://discourse.julialang.org/u/a6a3uh)\
**Replies:** 0\
**Last updated:** [February 27, 2024, 9:36am UTC](https://discourse.julialang.org/t/diffeqcallback-and-quadrature-calculation-with-integratingcallback/110836 "2024-02-27T09:36:58Z")

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Hi! I’m trying to calculate some integral along the IVP for some ODE. In particular I’m calculating a running cost for my control system simulation (or value of some functional). It looks like IntegratingCallback and In…

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## [How can I disable the event handler in a fixed time interval after an event?](https://discourse.julialang.org/t/how-can-i-disable-the-event-handler-in-a-fixed-time-interval-after-an-event/110823)

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**Author:** [@xiaoming](https://discourse.julialang.org/u/xiaoming)\
**Replies:** 4\
**Last updated:** [February 27, 2024, 9:29am UTC](https://discourse.julialang.org/t/how-can-i-disable-the-event-handler-in-a-fixed-time-interval-after-an-event/110823 "2024-02-27T09:29:13Z")

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I have checked the document of DifferentialEquations.jl about the Event handler page. It seems that I should set repeat\_nudge in a ContinuousCallback. However, it doesn’t work. Here is an MME: using OrdinaryDiffEq, Sta…

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## [Cross Asset Skew using Julia](https://discourse.julialang.org/t/cross-asset-skew-using-julia/110824)

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**Author:** [@dm13450](https://discourse.julialang.org/u/dm13450)\
**Replies:** 0\
**Last updated:** [February 27, 2024, 6:19am UTC](https://discourse.julialang.org/t/cross-asset-skew-using-julia/110824 "2024-02-27T06:19:26Z")

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Hey, I’ve written about using Skew as a trading strategy Cross Asset Skew - A Trading Strategy | Dean Markwick

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## [WGLMakie in JupyterLab default mouse interaction](https://discourse.julialang.org/t/wglmakie-in-jupyterlab-default-mouse-interaction/110811)

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**Author:** [@myrddin89](https://discourse.julialang.org/u/myrddin89)\
**Replies:** 0\
**Last updated:** [February 26, 2024, 10:58pm UTC](https://discourse.julialang.org/t/wglmakie-in-jupyterlab-default-mouse-interaction/110811 "2024-02-26T22:58:48Z")

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Using WGLMakie 0.9.8 and JupyterLab 4.0 (macOS), the mouse interaction on the figure clashes with the JupyterLab UI. For example, it is not possible to reset the axis with ctrl-click as it triggers a right-click on the J…

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## [Scipy.signal.iirfilter equivalent in DSP.jl and more](https://discourse.julialang.org/t/scipy-signal-iirfilter-equivalent-in-dsp-jl-and-more/110783)

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**Author:** [@scelles](https://discourse.julialang.org/u/scelles)\
**Replies:** 3\
**Last updated:** [February 26, 2024, 8:46pm UTC](https://discourse.julialang.org/t/scipy-signal-iirfilter-equivalent-in-dsp-jl-and-more/110783 "2024-02-26T20:46:15Z")

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Hello, I did some DSP about 20 years ago but didn’t tackled that field recently. In order to get back to it I’m planning to build some Pluto.jl notebooks in this field. I found this blog post Applying digital filters …

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