# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=245

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**Page:** 246

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## [RemoteChannel based Collective Operations](https://discourse.julialang.org/t/remotechannel-based-collective-operations/88453)

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**Author:** [@charlescolley](https://discourse.julialang.org/u/charlescolley)\
**Replies:** 0\
**Last updated:** [October 8, 2022, 4:57pm UTC](https://discourse.julialang.org/t/remotechannel-based-collective-operations/88453 "2022-10-08T16:57:49Z")

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I have a small collection of tree-based collectives that I’m using for some of my projects. I’m new to distributed algorithms and wanted to get some thoughts on the code I’ve written and the profiling I’ve done in hopes …

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## [Fast way to access results in JuMP](https://discourse.julialang.org/t/fast-way-to-access-results-in-jump/88397)

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**Author:** [@TBuConst](https://discourse.julialang.org/u/TBuConst)\
**Replies:** 4\
**Last updated:** [October 8, 2022, 12:50pm UTC](https://discourse.julialang.org/t/fast-way-to-access-results-in-jump/88397 "2022-10-08T12:50:15Z")

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Hello everyone, say, I have a (pretty useless - just to illustrate the problem) MIP model in JuMP using JuMP using Cbc model = Model(Cbc.Optimizer) @variable(model, x\[1:100000, 1:10, 1:2\], Bin) @constraint(model, c\[i…

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## [XGBoost reduce overfitting | k-fold cross validation](https://discourse.julialang.org/t/xgboost-reduce-overfitting-k-fold-cross-validation/88423)

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**Author:** [@Seth16225](https://discourse.julialang.org/u/Seth16225)\
**Replies:** 1\
**Last updated:** [October 8, 2022, 12:25pm UTC](https://discourse.julialang.org/t/xgboost-reduce-overfitting-k-fold-cross-validation/88423 "2022-10-08T12:25:06Z")

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Hello, I’m pretty new to machine learning, and I was using XGBoost.jl Regression. I’m in the process of trying to reduce overfitting through k-fold cross validation. I came across the nfold\_cv function, and I was wonder…

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## [Constraints not being satisfied while using vector elements as rhs](https://discourse.julialang.org/t/constraints-not-being-satisfied-while-using-vector-elements-as-rhs/88294)

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**Author:** [@Gokhan\_Kof](https://discourse.julialang.org/u/Gokhan_Kof)\
**Replies:** 7\
**Last updated:** [October 8, 2022, 4:42am UTC](https://discourse.julialang.org/t/constraints-not-being-satisfied-while-using-vector-elements-as-rhs/88294 "2022-10-08T04:42:47Z")

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Hi, I am trying to solve the model below but the constraints are not being satisfied if I input a vector on the rhs (u\[j\] - 1). But, when I type it with hand (34, 28). It is being satisfied. ap.p 3 ap.n 5 ap.c 3×5×5 Ar…

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## [How to use a solution as starting point to run my NL model again after modifying something (e.g. a constraint)?](https://discourse.julialang.org/t/how-to-use-a-solution-as-starting-point-to-run-my-nl-model-again-after-modifying-something-e-g-a-constraint/88203)

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**Author:** [@Angel127](https://discourse.julialang.org/u/Angel127)\
**Replies:** 2\
**Last updated:** [October 8, 2022, 4:38am UTC](https://discourse.julialang.org/t/how-to-use-a-solution-as-starting-point-to-run-my-nl-model-again-after-modifying-something-e-g-a-constraint/88203 "2022-10-08T04:38:44Z")

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I have a NL model, and it finds a locally optimal solution after two hours. I would like to apply a nested for loop to use the epsilon constrained method. Then, on each iteration, some right-hand side coefficients will b…

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## [Model creation inside a loop](https://discourse.julialang.org/t/model-creation-inside-a-loop/88183)

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**Author:** [@Mariana](https://discourse.julialang.org/u/Mariana)\
**Replies:** 6\
**Last updated:** [October 8, 2022, 4:38am UTC](https://discourse.julialang.org/t/model-creation-inside-a-loop/88183 "2022-10-08T04:38:03Z")

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Hello! I’m using JuMP and Cbc solver to create an optimization model for each parameter p of a parameter set P, so basically, I have a code like this: for p in P model = create\_model(p) optimize! # Store resul…

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## [Partial tracing on a SDP @variable](https://discourse.julialang.org/t/partial-tracing-on-a-sdp-variable/88123)

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**Author:** [@danuzco](https://discourse.julialang.org/u/danuzco)\
**Replies:** 1\
**Last updated:** [October 8, 2022, 4:36am UTC](https://discourse.julialang.org/t/partial-tracing-on-a-sdp-variable/88123 "2022-10-08T04:36:32Z")

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I want to be able of partial tracing the X variable defined below : using ProxSDP, JuMP model = Model(with\_optimizer(ProxSDP.Optimizer, log\_verbose=false)) @variable(model, X\[1:N,1:N\], PSD) where N\>=1. I tried using Qu…

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## [Trouble plotting multiple spheres in GLMakie](https://discourse.julialang.org/t/trouble-plotting-multiple-spheres-in-glmakie/88387)

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**Author:** [@Mervyn\_Larrier](https://discourse.julialang.org/u/Mervyn_Larrier)\
**Replies:** 2\
**Last updated:** [October 7, 2022, 11:27pm UTC](https://discourse.julialang.org/t/trouble-plotting-multiple-spheres-in-glmakie/88387 "2022-10-07T23:27:09Z")

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I would like to plot a sphere inside another sphere. I’m using a wireframe to easily see the intersection in the spheres (if any exist), but I’m open to mesh solutions as well. The code compiles, but it won’t visualize; …

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## [Comparison of different fft-implementations](https://discourse.julialang.org/t/comparison-of-different-fft-implementations/86021)

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**Author:** [@ellocco](https://discourse.julialang.org/u/ellocco)\
**Replies:** 11\
**Last updated:** [October 7, 2022, 10:00pm UTC](https://discourse.julialang.org/t/comparison-of-different-fft-implementations/86021 "2022-10-07T22:00:26Z")

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Hi, I am struggling with fft-analysis of real-world data. Main objective are correct results. Currently I use two different fft-implementations: FFTW.fft() SciPy.fft.fft() The reason for this is that FFTW.fft() see…

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## [Feedback on a 2d spring simulation](https://discourse.julialang.org/t/feedback-on-a-2d-spring-simulation/88350)

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**Author:** [@maxkapur](https://discourse.julialang.org/u/maxkapur)\
**Replies:** 10\
**Last updated:** [October 7, 2022, 6:26pm UTC](https://discourse.julialang.org/t/feedback-on-a-2d-spring-simulation/88350 "2022-10-07T18:26:05Z")

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This post does not present a specific question or problem. I have working code—a tiny simulation of a dynamic system involving some springs in 2d space—and I am hoping for general feedback regarding code idiomaticity, pe…

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## [\[LinearSolve\] Inexact error in solving 4x4 linear system of equations](https://discourse.julialang.org/t/linearsolve-inexact-error-in-solving-4x4-linear-system-of-equations/88404)

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**Author:** [@TheLateKronos](https://discourse.julialang.org/u/TheLateKronos)\
**Replies:** 4\
**Last updated:** [October 7, 2022, 3:40pm UTC](https://discourse.julialang.org/t/linearsolve-inexact-error-in-solving-4x4-linear-system-of-equations/88404 "2022-10-07T15:40:06Z")

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I have this issue in solving a simple set of equations: julia\> using LinearSolve julia\> let A = \[1.0 0.0 -1.0 0.0 0.0 -3152.28 0.0 3152.28 0.…

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## [Default length unit with PGFPlotsX and Plots](https://discourse.julialang.org/t/default-length-unit-with-pgfplotsx-and-plots/88367)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 3\
**Last updated:** [October 7, 2022, 12:40pm UTC](https://discourse.julialang.org/t/default-length-unit-with-pgfplotsx-and-plots/88367 "2022-10-07T12:40:56Z")

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I am using PGFPlotsX as a backend for Plots. I have specified the plot width as 800. After I saved the plot to pdf and inspected the properties, the width seems to be 194mm, which is around 550 pt. What are the default …

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## [Repartition data back and forward from one administrative division to another](https://discourse.julialang.org/t/repartition-data-back-and-forward-from-one-administrative-division-to-another/88389)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 1\
**Last updated:** [October 7, 2022, 11:55am UTC](https://discourse.julialang.org/t/repartition-data-back-and-forward-from-one-administrative-division-to-another/88389 "2022-10-07T11:55:17Z")

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I have some data relative to a certain administrative division, let’s say forest volumes per region. I need to translate this data in a second definition of “regions”, and sometimes I need to do the opposite. I have th…

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## [How to change the country name and then draw the global map?](https://discourse.julialang.org/t/how-to-change-the-country-name-and-then-draw-the-global-map/88076)

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**Author:** [@akshdfyehd](https://discourse.julialang.org/u/akshdfyehd)\
**Replies:** 20\
**Last updated:** [October 7, 2022, 10:50am UTC](https://discourse.julialang.org/t/how-to-change-the-country-name-and-then-draw-the-global-map/88076 "2022-10-07T10:50:32Z")

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Hi, I got the dataset like following: I want to make a world map and see which country have higher mean salary, maybe represent through density or sth else, like density higher means the mean salary is higher, I tried…

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## [Animation images and dataframe content](https://discourse.julialang.org/t/animation-images-and-dataframe-content/88336)

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**Author:** [@pascal](https://discourse.julialang.org/u/pascal)\
**Replies:** 3\
**Last updated:** [October 7, 2022, 8:03am UTC](https://discourse.julialang.org/t/animation-images-and-dataframe-content/88336 "2022-10-07T08:03:35Z")

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I have multiple images stacked into an array: using CairoMakie using Images using DataFrames using DataFramesMeta # Load cow img\_orig = load(Makie.assetpath("cow.png")) img\_filt1 = imfilter(img\_orig, Kernel.gaussian(3)…

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## [Dash.jl: download graph as svg, 'toImageButtonOptions' not working!](https://discourse.julialang.org/t/dash-jl-download-graph-as-svg-toimagebuttonoptions-not-working/88212)

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**Author:** [@Bondan000](https://discourse.julialang.org/u/Bondan000)\
**Replies:** 1\
**Last updated:** [October 7, 2022, 6:31am UTC](https://discourse.julialang.org/t/dash-jl-download-graph-as-svg-toimagebuttonoptions-not-working/88212 "2022-10-07T06:31:41Z")

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Hi, I created a small webapp which reads a csv and generate a plot using Plotly.jl and Dash.jl! I have a custom ‘myPlot’ function which generates the plot! I added the config settings in the ‘myPlot’ function: function …

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## [Control width of legend box with Plots](https://discourse.julialang.org/t/control-width-of-legend-box-with-plots/88372)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 0\
**Last updated:** [October 6, 2022, 10:21pm UTC](https://discourse.julialang.org/t/control-width-of-legend-box-with-plots/88372 "2022-10-06T22:21:56Z")

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Is there a way to control the scaling of the width of the legend box with Plots? In essence, I would like to make the lines longer, and it seems that controlling the width of the legend box itself is a way to do that, a…

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## [Access lualatex log with PGFPlotsX](https://discourse.julialang.org/t/access-lualatex-log-with-pgfplotsx/88355)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 4\
**Last updated:** [October 6, 2022, 6:35pm UTC](https://discourse.julialang.org/t/access-lualatex-log-with-pgfplotsx/88355 "2022-10-06T18:35:17Z")

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I am trying to use PGFPlotsX together with Plots, and I get the following error: The latex command \`lualatex jl\_ODVl4Y.tex\` failed How do I access the lualatex log itself to understand what is going on?

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## [Problem with NLSolve: cant find x st f(x) =0](https://discourse.julialang.org/t/problem-with-nlsolve-cant-find-x-st-f-x-0/88345)

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**Author:** [@Outeirom](https://discourse.julialang.org/u/Outeirom)\
**Replies:** 4\
**Last updated:** [October 6, 2022, 4:39pm UTC](https://discourse.julialang.org/t/problem-with-nlsolve-cant-find-x-st-f-x-0/88345 "2022-10-06T16:39:52Z")

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So, I have a code in matlab and I am trying to translate it to Julia. Im not being able to run this NLSolve in Julia. It returns me a domain error… probably because there is x^eta, where eta = 0.5. But what makes no se…

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## [Method Error when using LinearMixedModel function](https://discourse.julialang.org/t/method-error-when-using-linearmixedmodel-function/88243)

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**Author:** [@imantha](https://discourse.julialang.org/u/imantha)\
**Replies:** 3\
**Last updated:** [October 6, 2022, 3:03pm UTC](https://discourse.julialang.org/t/method-error-when-using-linearmixedmodel-function/88243 "2022-10-06T15:03:57Z")

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Hi I am having trouble using the Mixed Model package as following the example doesnt seem to work. I get the following Method Error ERROR: MethodError: no method matching LinearMixedModel(::Vector{Int64}, ::Matrix{Float…

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## [Ferrite.jl periodic boundary conditions](https://discourse.julialang.org/t/ferrite-jl-periodic-boundary-conditions/39387)

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**Author:** [@blaszm](https://discourse.julialang.org/u/blaszm)\
**Replies:** 2\
**Last updated:** [October 6, 2022, 11:42am UTC](https://discourse.julialang.org/t/ferrite-jl-periodic-boundary-conditions/39387 "2022-10-06T11:42:34Z")

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Hi, I’m a PhD student working on the multiscale simulation of complex materials. Recently I discovered Julia and the JuAFEM package for my work. I’m trying to do FE² (finite element square). For this purpose, usually the…

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## [Rotr90 of a CUDA.CuArray](https://discourse.julialang.org/t/rotr90-of-a-cuda-cuarray/88308)

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**Author:** [@leifdenby](https://discourse.julialang.org/u/leifdenby)\
**Replies:** 5\
**Last updated:** [October 6, 2022, 10:16am UTC](https://discourse.julialang.org/t/rotr90-of-a-cuda-cuarray/88308 "2022-10-06T10:16:38Z")

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I’m trying to implement a neural network which rotates the image within the layers of the network. My question is: is there a way to use something like Base.rotr90 on a CUDA.CuArray while disabling scalar indexing (CUDA.…

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## [Anyone developing multinomial logistic regression?](https://discourse.julialang.org/t/anyone-developing-multinomial-logistic-regression/23222)

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**Author:** [@tyleransom](https://discourse.julialang.org/u/tyleransom)\
**Replies:** 19\
**Last updated:** [October 6, 2022, 9:30am UTC](https://discourse.julialang.org/t/anyone-developing-multinomial-logistic-regression/23222 "2022-10-06T09:30:02Z")

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Hi all, I’m looking to write a multinomial logistic regression function (including conditional logit). From what I can see, there is no extant package that can do this. Given the popularity of such a model, I’m surprise…

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## [SDE simulation using DifferentialEquations.jl SDE solver RKMilGeneral](https://discourse.julialang.org/t/sde-simulation-using-differentialequations-jl-sde-solver-rkmilgeneral/88312)

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**Author:** [@Max\_Beez](https://discourse.julialang.org/u/Max_Beez)\
**Replies:** 3\
**Last updated:** [October 6, 2022, 2:20am UTC](https://discourse.julialang.org/t/sde-simulation-using-differentialequations-jl-sde-solver-rkmilgeneral/88312 "2022-10-06T02:20:55Z")

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I am simulating an SDE and using scatter! to plot the results. I set dt = 0.1 with timespan 0.0 to 1.0, then if use EM() as the SDE solver method I get 10 equally spaced (in-time) scatter points on the plot. Howeve…

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## [How to get the updated coordinates of vertices in the interaction with mouse using Makie.jl](https://discourse.julialang.org/t/how-to-get-the-updated-coordinates-of-vertices-in-the-interaction-with-mouse-using-makie-jl/87900)

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**Author:** [@Firstname\_Lastname](https://discourse.julialang.org/u/Firstname_Lastname)\
**Replies:** 2\
**Last updated:** [October 5, 2022, 3:01pm UTC](https://discourse.julialang.org/t/how-to-get-the-updated-coordinates-of-vertices-in-the-interaction-with-mouse-using-makie-jl/87900 "2022-10-05T15:01:49Z")

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From the tutorial Interactive data visualizations with Makie.jl | Simon Danisch & Julius Krumbiegel | JuliaCon 2022 - YouTube I learned that the package Makie.jl is very nice and powerful. It can quickly update the plo…

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## [Missing imputation: comparision of BetaML, Python SKL, R Mice](https://discourse.julialang.org/t/missing-imputation-comparision-of-betaml-python-skl-r-mice/72447)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 1\
**Last updated:** [October 5, 2022, 2:58pm UTC](https://discourse.julialang.org/t/missing-imputation-comparision-of-betaml-python-skl-r-mice/72447 "2022-10-05T14:58:51Z")

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Hello, I did a small benchmarking of Julia BetaML (predictMissing - that uses GMM - and custom random forest prediction), SciKitLearn SI, II and KK-based imputators and R Mice, using the default values for each. Below a…

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## [NLSolve vs fsolve (matlab): What am I doing wrong?](https://discourse.julialang.org/t/nlsolve-vs-fsolve-matlab-what-am-i-doing-wrong/88095)

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**Author:** [@Outeirom](https://discourse.julialang.org/u/Outeirom)\
**Replies:** 5\
**Last updated:** [October 5, 2022, 1:34pm UTC](https://discourse.julialang.org/t/nlsolve-vs-fsolve-matlab-what-am-i-doing-wrong/88095 "2022-10-05T13:34:26Z")

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So, I have a code in matlab and I am trying to translate it to Julia. Can anyone help me an tell me what am I doing wrong? Basically it is a function and I need to use fsolve/ NLSolve. I put first fig below matlab codes…

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## [Transparancy in colormap / removing contour level](https://discourse.julialang.org/t/transparancy-in-colormap-removing-contour-level/88283)

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**Author:** [@Janssena](https://discourse.julialang.org/u/Janssena)\
**Replies:** 0\
**Last updated:** [October 5, 2022, 10:53am UTC](https://discourse.julialang.org/t/transparancy-in-colormap-removing-contour-level/88283 "2022-10-05T10:53:54Z")

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Hey All, I am trying to create a contourf() plot where the lowest contour level is not being colored. I want to overlap multiple contour plots so I do not want the lowest level of contour 2 to overlap contour 1. I am u…

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## [Recommended way to extract logprob and build gradients in Turing.jl?](https://discourse.julialang.org/t/recommended-way-to-extract-logprob-and-build-gradients-in-turing-jl/88279)

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**Author:** [@svilupp](https://discourse.julialang.org/u/svilupp)\
**Replies:** 2\
**Last updated:** [October 5, 2022, 11:19am UTC](https://discourse.julialang.org/t/recommended-way-to-extract-logprob-and-build-gradients-in-turing-jl/88279 "2022-10-05T11:19:15Z")

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Hi everyone, What is the recommended way to extract the log density and build gradients from a Turing model? (DynamicPPL) Use cases: eg, feeding it to something like Pathfinder.jl (if it didn’t Turing API) or novel sam…

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## [Neural Nets training with multiple Chains Lux.jl and CUDA.jl](https://discourse.julialang.org/t/neural-nets-training-with-multiple-chains-lux-jl-and-cuda-jl/88167)

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**Author:** [@LeoCott](https://discourse.julialang.org/u/LeoCott)\
**Replies:** 5\
**Last updated:** [October 5, 2022, 10:30am UTC](https://discourse.julialang.org/t/neural-nets-training-with-multiple-chains-lux-jl-and-cuda-jl/88167 "2022-10-05T10:30:51Z")

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Hi all, I am a GPU beginner so I probably ask something obvious. I defined a neural net with four Lux.jl chains: input\_ = 2 n = 20 chain1 = Lux.Chain(Dense(input\_,n,Lux.σ),Dense(n,n,Lux.σ),Dense(n,n,Lux.σ),Dense(n,n,L…

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