# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=113

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**Page:** 114

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## [CVODE\_BDF outperforms Julia solvers for stiff system biology model?](https://discourse.julialang.org/t/cvode-bdf-outperforms-julia-solvers-for-stiff-system-biology-model/113936)

<div class="topic-metadata">

**Author:** [@sebapersson](https://discourse.julialang.org/u/sebapersson)\
**Replies:** 5\
**Last updated:** [May 8, 2024, 3:34pm UTC](https://discourse.julialang.org/t/cvode-bdf-outperforms-julia-solvers-for-stiff-system-biology-model/113936 "2024-05-08T15:34:19Z")

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For medium sized stiff system biology ODE models I have recently done two benchmarks that suggest that CVODE\_BDF outperform the Julia solvers (in particular the multi-step bdf solvers). Below is an with 25 ODEs and 39 p…

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## [Is it time to make a pure Julia FFT?](https://discourse.julialang.org/t/is-it-time-to-make-a-pure-julia-fft/99256)

<div class="topic-metadata">

**Author:** [@Tarny\_GG\_Channie](https://discourse.julialang.org/u/Tarny_GG_Channie)\
**Replies:** 14\
**Last updated:** [May 8, 2024, 3:21pm UTC](https://discourse.julialang.org/t/is-it-time-to-make-a-pure-julia-fft/99256 "2024-05-08T15:21:13Z")

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While FFTW is great, it is a GPL-licensed C library. R, Mathematica, Python’s Scipy, etc have their own FFT library. Should we finally have our own FFT library? A pure Julia FFT may provide several advantages such as bei…

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## [Issue with misaligned x-axis in multiple histograms in CairoMakie](https://discourse.julialang.org/t/issue-with-misaligned-x-axis-in-multiple-histograms-in-cairomakie/114002)

<div class="topic-metadata">

**Author:** [@indymnv](https://discourse.julialang.org/u/indymnv)\
**Replies:** 2\
**Last updated:** [May 8, 2024, 2:53pm UTC](https://discourse.julialang.org/t/issue-with-misaligned-x-axis-in-multiple-histograms-in-cairomakie/114002 "2024-05-08T14:53:04Z")

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I’m trying to create histograms to represent time, with a specific dataframe and I’ve noticed that in some cases the X-axis isn’t properly adjusted with the interval separation and its respective axis. fig2 = Figure() a…

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## [Bounds Error when following tutorial of ReinforcementLearning.jl](https://discourse.julialang.org/t/bounds-error-when-following-tutorial-of-reinforcementlearning-jl/113999)

<div class="topic-metadata">

**Author:** [@ras112](https://discourse.julialang.org/u/ras112)\
**Replies:** 0\
**Last updated:** [May 8, 2024, 1:45pm UTC](https://discourse.julialang.org/t/bounds-error-when-following-tutorial-of-reinforcementlearning-jl/113999 "2024-05-08T13:45:17Z")

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Hello community, I have been trying to implement a basic Q-learning algorithm following the tutorial of the ReinforcementLearning.jl. The main issue comes when, instead of giving the agent a RandomPolicy() as policy, I …

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## [Problem about solution of Gurobi in Julia](https://discourse.julialang.org/t/problem-about-solution-of-gurobi-in-julia/113993)

<div class="topic-metadata">

**Author:** [@Z\_M](https://discourse.julialang.org/u/Z_M)\
**Replies:** 1\
**Last updated:** [May 8, 2024, 1:02pm UTC](https://discourse.julialang.org/t/problem-about-solution-of-gurobi-in-julia/113993 "2024-05-08T13:02:05Z")

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Hi guys! I use Gurobi in Julia. However, the solution summary is as follows： If the solve status is OPTIMAL, why it has no solution?

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## [GLMakie plotting in VSCode?](https://discourse.julialang.org/t/glmakie-plotting-in-vscode/100057)

<div class="topic-metadata">

**Author:** [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)\
**Replies:** 11\
**Last updated:** [May 8, 2024, 12:22pm UTC](https://discourse.julialang.org/t/glmakie-plotting-in-vscode/100057 "2024-05-08T12:22:33Z")

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Hello, I just updated my project’s dependencies and suddenly GLMakie displays my interactive plots in VSCode’s plot pane. Both Makie and GLMakie are at the latest versions. Was there any change as to how VSCode or GLMak…

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## [Abs in JuMP - how (why?) does it work](https://discourse.julialang.org/t/abs-in-jump-how-why-does-it-work/113909)

<div class="topic-metadata">

**Author:** [@blob](https://discourse.julialang.org/u/blob)\
**Replies:** 7\
**Last updated:** [May 8, 2024, 9:25am UTC](https://discourse.julialang.org/t/abs-in-jump-how-why-does-it-work/113909 "2024-05-08T09:25:54Z")

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I cannot get my head around what JuMP/Ipopt is doing if I have an absolute value in the constraints. This runs and I cannot find out why: using JuMP, Ipopt tf=10 model = Model(Ipopt.Optimizer) @variable(model, 0\<=v) …

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## [Extract linear algebraic equations](https://discourse.julialang.org/t/extract-linear-algebraic-equations/113985)

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**Author:** [@Jan\_Svanda](https://discourse.julialang.org/u/Jan_Svanda)\
**Replies:** 0\
**Last updated:** [May 8, 2024, 8:01am UTC](https://discourse.julialang.org/t/extract-linear-algebraic-equations/113985 "2024-05-08T08:01:24Z")

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I’m trying to use ModelingToolkit.jl to generate a system of linear algebraic equations. It’s quite simple: my system is a resistor network with a constant voltage source. I use ModelingToolkit to create a topology, and …

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## [Unable to use local CUDA runtime toolkit](https://discourse.julialang.org/t/unable-to-use-local-cuda-runtime-toolkit/113980)

<div class="topic-metadata">

**Author:** [@mtyogi](https://discourse.julialang.org/u/mtyogi)\
**Replies:** 2\
**Last updated:** [May 8, 2024, 7:59am UTC](https://discourse.julialang.org/t/unable-to-use-local-cuda-runtime-toolkit/113980 "2024-05-08T07:59:44Z")

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Hi All, I am trying use local CUDA runtime (12.4) toolkit, but I get the following error. └ @ CUDA\_Runtime\_Discovery C:\\Users\\mohitt\\.julia\\packages\\CUDA\_Runtime\_Discovery\\ZGnCZ\\src\\CUDA\_Runtime\_Discovery.jl:139 ┌ Deb…

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## [LMI optimization problem](https://discourse.julialang.org/t/lmi-optimization-problem/112218)

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**Author:** [@Sharara](https://discourse.julialang.org/u/Sharara)\
**Replies:** 9\
**Last updated:** [May 7, 2024, 9:55pm UTC](https://discourse.julialang.org/t/lmi-optimization-problem/112218 "2024-05-07T21:55:26Z")

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Hi there I am regenerating an optimization algorithm from a paper and I am using exactly the example provided by the ref. this is the algorithm: It starts a long operation (continuously trying to obtain results - n…

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## [\[English name suggestion\] "FeatureImportanceCalculator", "\[.\]Estimator", "\[.\]Indicator" or what?](https://discourse.julialang.org/t/english-name-suggestion-featureimportancecalculator-estimator-indicator-or-what/113949)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 3\
**Last updated:** [May 7, 2024, 9:31pm UTC](https://discourse.julialang.org/t/english-name-suggestion-featureimportancecalculator-estimator-indicator-or-what/113949 "2024-05-07T21:31:52Z")

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For a model that returns the ranking of the variables based on some “variable importance metric” to be used as: m = ModelName(a\_ML\_model,options) fit!(m,x,y) var\_importance\_ranking = predict(m) mda\_losses = info(m)\["mda…

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## [Error with ModelingToolkit documentation example](https://discourse.julialang.org/t/error-with-modelingtoolkit-documentation-example/113946)

<div class="topic-metadata">

**Author:** [@amytmoody](https://discourse.julialang.org/u/amytmoody)\
**Replies:** 2\
**Last updated:** [May 7, 2024, 2:39pm UTC](https://discourse.julialang.org/t/error-with-modelingtoolkit-documentation-example/113946 "2024-05-07T14:39:05Z")

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I’m getting the following error from the first example in the Getting Started with ModelingToolkit example. WARNING: could not import ModelingToolkit.t\_nounits into Main UndefVarError: \`D\` not defined I found a workar…

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## [If EnzymeRules.inactive() is defined, does the Enzyme.jl operation still take place?](https://discourse.julialang.org/t/if-enzymerules-inactive-is-defined-does-the-enzyme-jl-operation-still-take-place/113369)

<div class="topic-metadata">

**Author:** [@ToPo](https://discourse.julialang.org/u/ToPo)\
**Replies:** 6\
**Last updated:** [May 7, 2024, 2:17pm UTC](https://discourse.julialang.org/t/if-enzymerules-inactive-is-defined-does-the-enzyme-jl-operation-still-take-place/113369 "2024-05-07T14:17:18Z")

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When performing automatic differentiation using Enzyme.jl, Errors and warnings occur in functions that define EnzymeRules.inactive(). I thought that the application of Enzyme.jl was ignored when EnzymeRules.inactive() w…

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## [Inconsistent results trying to mesure feature importance](https://discourse.julialang.org/t/inconsistent-results-trying-to-mesure-feature-importance/113885)

<div class="topic-metadata">

**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 5\
**Last updated:** [May 6, 2024, 3:23pm UTC](https://discourse.julialang.org/t/inconsistent-results-trying-to-mesure-feature-importance/113885 "2024-05-06T15:23:21Z")

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Hello, I am trying to build a method to generically measure feature importance in ML models but I am having very inconsistent results, that depends on the individual run, and I am very p…off and I don’t understand why. I…

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## [LASSO or step-wise regression for Julia](https://discourse.julialang.org/t/lasso-or-step-wise-regression-for-julia/62061)

<div class="topic-metadata">

**Author:** [@Babou](https://discourse.julialang.org/u/Babou)\
**Replies:** 7\
**Last updated:** [May 6, 2024, 2:29pm UTC](https://discourse.julialang.org/t/lasso-or-step-wise-regression-for-julia/62061 "2024-05-06T14:29:26Z")

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I want to write a julia script to run a linear mixed model with a lasso regression as my code in R is quite slow. Is there a package that works with the mixed models package that implements lasso or stepwise regression? …

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## [Adding at specific CuArray position](https://discourse.julialang.org/t/adding-at-specific-cuarray-position/113855)

<div class="topic-metadata">

**Author:** [@Andrea\_Deflorio](https://discourse.julialang.org/u/Andrea_Deflorio)\
**Replies:** 6\
**Last updated:** [May 6, 2024, 1:58pm UTC](https://discourse.julialang.org/t/adding-at-specific-cuarray-position/113855 "2024-05-06T13:58:25Z")

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How to fix this function? Also how to fix the line #@atomic counts\[indices\[idx\]\] += 1, it doesn’t compile at all. function count\_indices(indices::CuArray{Int64,1}, maxSize::Int64) # Initialize a CuArray of zeros wi…

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## [Is there a Package for EVM calculation and constellation diagram visualization in digital communications?](https://discourse.julialang.org/t/is-there-a-package-for-evm-calculation-and-constellation-diagram-visualization-in-digital-communications/113905)

<div class="topic-metadata">

**Author:** [@Trailing3208](https://discourse.julialang.org/u/Trailing3208)\
**Replies:** 0\
**Last updated:** [May 6, 2024, 1:57pm UTC](https://discourse.julialang.org/t/is-there-a-package-for-evm-calculation-and-constellation-diagram-visualization-in-digital-communications/113905 "2024-05-06T13:57:26Z")

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Hello there, I’m currently trying to implement some digital communications simulation and there are a bunch of helpful packages such as DSP.jl as well as DigitalComm.jl, but as far as I know there is no implementation o…

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## [Get smooth CDF from OnlineStats's Quantile](https://discourse.julialang.org/t/get-smooth-cdf-from-onlinestatss-quantile/113886)

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**Author:** [@disberd](https://discourse.julialang.org/u/disberd)\
**Replies:** 6\
**Last updated:** [May 6, 2024, 1:41pm UTC](https://discourse.julialang.org/t/get-smooth-cdf-from-onlinestatss-quantile/113886 "2024-05-06T13:41:44Z")

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Hello, I am tracking statistics of some simulations using the Quantile object from the amazing OnlineStats.jl I am also interested in being able to plot the CDF of the variable being observed with the Quantile but tryi…

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## [Troubleshooting Inverse Problem with PINNs for Wind Turbine Aerodynamics using NeuralPDE.jl](https://discourse.julialang.org/t/troubleshooting-inverse-problem-with-pinns-for-wind-turbine-aerodynamics-using-neuralpde-jl/113232)

<div class="topic-metadata">

**Author:** [@Alvaro98](https://discourse.julialang.org/u/Alvaro98)\
**Replies:** 12\
**Last updated:** [May 6, 2024, 9:46am UTC](https://discourse.julialang.org/t/troubleshooting-inverse-problem-with-pinns-for-wind-turbine-aerodynamics-using-neuralpde-jl/113232 "2024-05-06T09:46:41Z")

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Hello all, I’m trying to estimate 10 parameters (c1 to c10) of an ODE representing the aerodynamic model of a wind turbine, and I’ve decided to do it via Bayesian inference using physics-informed neural networks (PINN) …

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## [SCS not properly installed](https://discourse.julialang.org/t/scs-not-properly-installed/113881)

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**Author:** [@devanshu](https://discourse.julialang.org/u/devanshu)\
**Replies:** 8\
**Last updated:** [May 6, 2024, 6:36am UTC](https://discourse.julialang.org/t/scs-not-properly-installed/113881 "2024-05-06T06:36:56Z")

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I am trying to add QuantumInformation.jl package in julia. But I am getting the following error: ERROR: The following 1 direct dependency failed to precompile: SCS \[c946c3f1-0d1f-5ce8-9dea-7daa1f7e2d13\] Failed to prec…

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## [Liouvillian superoperator way cannot run by \`timeevolution.master\_dynamic\` of QuantumOptics.jl](https://discourse.julialang.org/t/liouvillian-superoperator-way-cannot-run-by-timeevolution-master-dynamic-of-quantumoptics-jl/113650)

<div class="topic-metadata">

**Author:** [@fqguo](https://discourse.julialang.org/u/fqguo)\
**Replies:** 12\
**Last updated:** [May 6, 2024, 3:02am UTC](https://discourse.julialang.org/t/liouvillian-superoperator-way-cannot-run-by-timeevolution-master-dynamic-of-quantumoptics-jl/113650 "2024-05-06T03:02:22Z")

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When i use the package QuantumOptics.jl to simulate the evolution of Liouvillian superoperator, i find it cannot run by the command timeevolution.master\_dynamic. Because after obtaining the superoperator, i ready to solv…

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## [How to not overdraw gridlines in GeoAxis?](https://discourse.julialang.org/t/how-to-not-overdraw-gridlines-in-geoaxis/113789)

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**Author:** [@yum-yab](https://discourse.julialang.org/u/yum-yab)\
**Replies:** 1\
**Last updated:** [May 6, 2024, 1:06am UTC](https://discourse.julialang.org/t/how-to-not-overdraw-gridlines-in-geoaxis/113789 "2024-05-06T01:06:28Z")

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I want to draw a surface on GeoAxis and keep the gridlines in the axis. Unfortunately after passing a certain value (100 i think) the surface overdraws the gridlines, which looks quite bad and not very intended. Is there…

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## [The Einstein Riddle](https://discourse.julialang.org/t/the-einstein-riddle/113750)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 11\
**Last updated:** [May 5, 2024, 8:14pm UTC](https://discourse.julialang.org/t/the-einstein-riddle/113750 "2024-05-05T20:14:56Z")

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From the web: \<\<It’s famously known as the Einstein Riddle because it was supposedly created by Einstein as a young man for fun. But there are some claims online that it actually was invented by the author of Alice’s A…

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## [Is it possible to make a video with transparency?](https://discourse.julialang.org/t/is-it-possible-to-make-a-video-with-transparency/113860)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 4\
**Last updated:** [May 5, 2024, 2:39pm UTC](https://discourse.julialang.org/t/is-it-possible-to-make-a-video-with-transparency/113860 "2024-05-05T14:39:45Z")

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Is it possible to make a video with transparency? I am remaking the DynamicalSystems.jl logo and I would be happy to make a video itself transparent so that it can obtain whatever background color the website has. The q…

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## [Some notes on using IJulia (and nbextensions) as a Python noob](https://discourse.julialang.org/t/some-notes-on-using-ijulia-and-nbextensions-as-a-python-noob/42902)

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**Author:** [@anon67531922](https://discourse.julialang.org/u/anon67531922)\
**Replies:** 0\
**Last updated:** [July 11, 2020, 5:27pm UTC](https://discourse.julialang.org/t/some-notes-on-using-ijulia-and-nbextensions-as-a-python-noob/42902 "2020-07-11T17:27:55Z")

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Back in 2013, I was looking for an open-source alternative to Matlab (my weapon of choice for the 20+ years prior). The obvious candidates were: Python R Octave I quickly ruled out Octave and didn’t see myself using R…

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## [Graph Database in Julia](https://discourse.julialang.org/t/graph-database-in-julia/60159)

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**Author:** [@SergeantMike67](https://discourse.julialang.org/u/SergeantMike67)\
**Replies:** 16\
**Last updated:** [May 5, 2024, 7:17am UTC](https://discourse.julialang.org/t/graph-database-in-julia/60159 "2024-05-05T07:17:42Z")

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Does anyone know if there is a project being developed for a graph database similar to Neo4j? Neo4j is written in Java, and I was thinking that Julia has the characteristics that are most desirable for creating a graph …

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## [Package in julia for solving optimization problems with cubic objective function](https://discourse.julialang.org/t/package-in-julia-for-solving-optimization-problems-with-cubic-objective-function/113055)

<div class="topic-metadata">

**Author:** [@heiwie](https://discourse.julialang.org/u/heiwie)\
**Replies:** 24\
**Last updated:** [May 4, 2024, 9:46pm UTC](https://discourse.julialang.org/t/package-in-julia-for-solving-optimization-problems-with-cubic-objective-function/113055 "2024-05-04T21:46:27Z")

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Hello, I am trying to solve an optimization problem which looks like this: @objective(model, Max, sum(beta\_2\[n\] \* node\_info\[2\]\[1\]\[n\]\[1\] \* prod\_levels\[2\]\[1\]\[n\] \* uncon\_probs\[2\]\[1\]\[n\] for n in 1:num\_nodes) …

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## [Classical Hypothesis tests: Wald, LR, LM](https://discourse.julialang.org/t/classical-hypothesis-tests-wald-lr-lm/39575)

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**Author:** [@Albert\_Zevelev](https://discourse.julialang.org/u/Albert_Zevelev)\
**Replies:** 10\
**Last updated:** [May 4, 2024, 6:34pm UTC](https://discourse.julialang.org/t/classical-hypothesis-tests-wald-lr-lm/39575 "2024-05-04T18:34:35Z")

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I was able to code up the LR & Wald tests. I need help w/ the score test. Does anyone know how to obtain the loglik functions after glm? using DataFrames, GLM, Distributions n=7; k=1; X=randn(n,k); β=\[2 ;-4\]; σ\_e = 10…

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## [MTK & NonlinearSolve](https://discourse.julialang.org/t/mtk-nonlinearsolve/113834)

<div class="topic-metadata">

**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 0\
**Last updated:** [May 4, 2024, 3:29pm UTC](https://discourse.julialang.org/t/mtk-nonlinearsolve/113834 "2024-05-04T15:29:56Z")

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I have converted a Python function to Julia which involves: kwargs to specify units, correlations, etc. unit conversion solving an implicit equation My Julia conversion works, but I’m thinking of converting the functi…

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## [Coupled PDE solver](https://discourse.julialang.org/t/coupled-pde-solver/113636)

<div class="topic-metadata">

**Author:** [@avishipoddar](https://discourse.julialang.org/u/avishipoddar)\
**Replies:** 1\
**Last updated:** [May 4, 2024, 10:45am UTC](https://discourse.julialang.org/t/coupled-pde-solver/113636 "2024-05-04T10:45:16Z")

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I am trying to solve a coupled linear pde I have attached my code below using DifferentialEquations using FiniteDifferences Define your system of coupled linear partial differential equations function coupled\_pdes(du…

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