# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=215

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**Page:** 216

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## [How to create surface plot in CairoMakie where the sides are 'filled'?](https://discourse.julialang.org/t/how-to-create-surface-plot-in-cairomakie-where-the-sides-are-filled/94454)

<div class="topic-metadata">

**Author:** [@yhchang96](https://discourse.julialang.org/u/yhchang96)\
**Replies:** 6\
**Last updated:** [February 13, 2023, 10:12pm UTC](https://discourse.julialang.org/t/how-to-create-surface-plot-in-cairomakie-where-the-sides-are-filled/94454 "2023-02-13T22:12:36Z")

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I can make a surface plot with the following codes: x = range(-1, 1, length=129) y = range(-1, 1, length=129) R = x'.^2 .+ y.^2 h2d = cos.(R) update\_theme!( lightposition = Vec3f(50, 10, 0), Axis3 = ( e…

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## [QHack has started](https://discourse.julialang.org/t/qhack-has-started/94574)

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**Author:** [@kslimes](https://discourse.julialang.org/u/kslimes)\
**Replies:** 0\
**Last updated:** [February 13, 2023, 4:22pm UTC](https://discourse.julialang.org/t/qhack-has-started/94574 "2023-02-13T16:22:05Z")

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Read the introductory blog post here! QHack is a free event running from February 13-28 2023, featuring scientific talks and a hackathon with multiple challenges. You can still sign up (for free!) to participate and it’…

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## [MethodOfLines & default vs. WENO scheme](https://discourse.julialang.org/t/methodoflines-default-vs-weno-scheme/94566)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 1\
**Last updated:** [February 13, 2023, 3:43pm UTC](https://discourse.julialang.org/t/methodoflines-default-vs-weno-scheme/94566 "2023-02-13T15:43:33Z")

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OK – I solved a “stupid” gas pipe example with manual semi-discretization + ModelingToolkit and lots of help from @baggepinnen, “MTK & vector equations…”. Now, I have figured out the basic solution of the problem using…

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## [Native eigenvals for differentiable programming](https://discourse.julialang.org/t/native-eigenvals-for-differentiable-programming/27126)

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**Author:** [@GJBoth](https://discourse.julialang.org/u/GJBoth)\
**Replies:** 23\
**Last updated:** [February 13, 2023, 3:32pm UTC](https://discourse.julialang.org/t/native-eigenvals-for-differentiable-programming/27126 "2023-02-13T15:32:20Z")

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Hi all, I’m working on a problem where I require an autodifferentiable eigenvalue solver for real, square matrices (but non-hermitian). Since Linear algebra’s version is based on LAPACK, I can’t use autodiff and I haven…

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## [ProgressiveHedging.jl - Decision Variables](https://discourse.julialang.org/t/progressivehedging-jl-decision-variables/94414)

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**Author:** [@Mariana](https://discourse.julialang.org/u/Mariana)\
**Replies:** 2\
**Last updated:** [February 13, 2023, 1:22pm UTC](https://discourse.julialang.org/t/progressivehedging-jl-decision-variables/94414 "2023-02-13T13:22:48Z")

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Hello! I’m starting to use ProgressiveHedging.jl and testing it in a two-stage problem. However, both the first and second stages variables in my case present different dimensions. For example, I have 6 first-stage dec…

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## [GLMakie: Reset all sliders inside SliderGrid via Button](https://discourse.julialang.org/t/glmakie-reset-all-sliders-inside-slidergrid-via-button/94555)

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**Author:** [@ellocco](https://discourse.julialang.org/u/ellocco)\
**Replies:** 0\
**Last updated:** [February 13, 2023, 12:35pm UTC](https://discourse.julialang.org/t/glmakie-reset-all-sliders-inside-slidergrid-via-button/94555 "2023-02-13T12:35:45Z")

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I wonder, if something exist like “Mouse.DoubleClick” on SliderGrid? The code below does what it should do, but it uses a for-loop over the SliderGrid. using GLMakie fig = Figure() # --- figure set-up: two panes side …

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## [The heat equation solution use MethodOfLines.jl](https://discourse.julialang.org/t/the-heat-equation-solution-use-methodoflines-jl/94331)

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**Author:** [@Fred\_He](https://discourse.julialang.org/u/Fred_He)\
**Replies:** 12\
**Last updated:** [February 13, 2023, 11:31am UTC](https://discourse.julialang.org/t/the-heat-equation-solution-use-methodoflines-jl/94331 "2023-02-13T11:31:56Z")

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the solution looks weird in https://docs.sciml.ai/MethodOfLines/stable/tutorials/heatss/ why its u(1, 1) = 0?

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## [Integration of arbitrarily-spaced data](https://discourse.julialang.org/t/integration-of-arbitrarily-spaced-data/94533)

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**Author:** [@SantiagoOrtiz](https://discourse.julialang.org/u/SantiagoOrtiz)\
**Replies:** 2\
**Last updated:** [February 13, 2023, 7:25am UTC](https://discourse.julialang.org/t/integration-of-arbitrarily-spaced-data/94533 "2023-02-13T07:25:22Z")

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Hello all, Is there any function/package in Julia that I could use to integrate one-dimensional arbitrarily-spaced data? NumericalIntegration has several options, but they require evenly spaced data. Best, Santiago

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## [Using interpolation with unit verification in ModelingToolkit](https://discourse.julialang.org/t/using-interpolation-with-unit-verification-in-modelingtoolkit/93837)

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**Author:** [@contradict](https://discourse.julialang.org/u/contradict)\
**Replies:** 1\
**Last updated:** [February 12, 2023, 10:46pm UTC](https://discourse.julialang.org/t/using-interpolation-with-unit-verification-in-modelingtoolkit/93837 "2023-02-12T22:46:59Z")

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I am trying to build a simulation driven by tabulated data and use unit validation. This requires interpolation of the table, and it seems DataInterpolation.jl is the intended tool (Interpolations.jl could work, but I th…

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## [Help needed with FFT and NFFT](https://discourse.julialang.org/t/help-needed-with-fft-and-nfft/93449)

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**Author:** [@Karajan](https://discourse.julialang.org/u/Karajan)\
**Replies:** 14\
**Last updated:** [February 12, 2023, 11:36am UTC](https://discourse.julialang.org/t/help-needed-with-fft-and-nfft/93449 "2023-02-12T11:36:10Z")

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Hi, I think I could use some help understanding nonuniform discrete Fourier transforms (NFFT). Either I’m not using the tools correctly or I’m misunderstanding how they work in general. I read that when my signal has no…

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## [Makie app from command line](https://discourse.julialang.org/t/makie-app-from-command-line/53890)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 12\
**Last updated:** [February 11, 2023, 9:29pm UTC](https://discourse.julialang.org/t/makie-app-from-command-line/53890 "2023-02-11T21:29:30Z")

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How can I launch a Makie.jl based app from the command line? I tried: julia --project -e "include(\\"./src/KiteViewer.jl\\");main()" which shortly shows the Makie windows but then terminates. How can I achieve that it …

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## [Seems the new update SciMLBase results in the error of DiffEqOperators.jl](https://discourse.julialang.org/t/seems-the-new-update-scimlbase-results-in-the-error-of-diffeqoperators-jl/94463)

<div class="topic-metadata">

**Author:** [@Fred\_He](https://discourse.julialang.org/u/Fred_He)\
**Replies:** 2\
**Last updated:** [February 11, 2023, 2:41pm UTC](https://discourse.julialang.org/t/seems-the-new-update-scimlbase-results-in-the-error-of-diffeqoperators-jl/94463 "2023-02-11T14:41:13Z")

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I understand that DiffEqOperators.jl will be deprecated but it is still useful for me to solve some PDEs. Can anyone suggest to me how to resolve this problem? using DiffEqOperators dx = 0.1 Δ1 = UpwindDifference(1,2, d…

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## [Mu synthesis with RobustAndOptimalControl?](https://discourse.julialang.org/t/mu-synthesis-with-robustandoptimalcontrol/94427)

<div class="topic-metadata">

**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 9\
**Last updated:** [February 11, 2023, 2:23pm UTC](https://discourse.julialang.org/t/mu-synthesis-with-robustandoptimalcontrol/94427 "2023-02-11T14:23:18Z")

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µ synthesis is a generalization of the controller design done using H infinity control. Is there a way to do µ synthesis using the RobustAndOptimalControl package?

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## [About the implementation of SciMLOperators.FunctionOperator](https://discourse.julialang.org/t/about-the-implementation-of-scimloperators-functionoperator/93738)

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**Author:** [@sbrisard](https://discourse.julialang.org/u/sbrisard)\
**Replies:** 8\
**Last updated:** [February 11, 2023, 10:30am UTC](https://discourse.julialang.org/t/about-the-implementation-of-scimloperators-functionoperator/93738 "2023-02-11T10:30:26Z")

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I am looking into SciMLOperators to define convolution linear operators. I was wondering why FunctionOperator requires prototypes of the input and output. Would the sizes not be sufficient? Also, it seems to me that t…

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## [Reactive UI that does not stop tasks after page refresh/close](https://discourse.julialang.org/t/reactive-ui-that-does-not-stop-tasks-after-page-refresh-close/94455)

<div class="topic-metadata">

**Author:** [@wiseac](https://discourse.julialang.org/u/wiseac)\
**Replies:** 0\
**Last updated:** [February 11, 2023, 5:33am UTC](https://discourse.julialang.org/t/reactive-ui-that-does-not-stop-tasks-after-page-refresh-close/94455 "2023-02-11T05:33:40Z")

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Hello, I’m trying to get into using a reactive web ui like Stipple.jl to create a Web UI that can control an analytical instrument. My main problem is i do not know how to keep a function running on the backend when the…

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## [Initial conditions as functions of parameters in ModelingToolkit?](https://discourse.julialang.org/t/initial-conditions-as-functions-of-parameters-in-modelingtoolkit/94438)

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**Author:** [@sdwfrost](https://discourse.julialang.org/u/sdwfrost)\
**Replies:** 2\
**Last updated:** [February 10, 2023, 10:23pm UTC](https://discourse.julialang.org/t/initial-conditions-as-functions-of-parameters-in-modelingtoolkit/94438 "2023-02-10T22:23:32Z")

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Hi everyone, Is it possible to have initial conditions as functions of the parameters in ModelingToolkit?

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## [JuMP: get (warm)start value of an expression](https://discourse.julialang.org/t/jump-get-warm-start-value-of-an-expression/93259)

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**Author:** [@john\_standard](https://discourse.julialang.org/u/john_standard)\
**Replies:** 3\
**Last updated:** [February 10, 2023, 8:24pm UTC](https://discourse.julialang.org/t/jump-get-warm-start-value-of-an-expression/93259 "2023-02-10T20:24:07Z")

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Context I’m trying to write some utility functions to solve non linear control problems using JuMP. Following the Rocket control tutorial I set my state variables as JuMP variables and the dynamics as constraints. Howev…

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## [Question about CUDA kernels](https://discourse.julialang.org/t/question-about-cuda-kernels/94345)

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**Author:** [@EduMolinero](https://discourse.julialang.org/u/EduMolinero)\
**Replies:** 4\
**Last updated:** [February 10, 2023, 3:33pm UTC](https://discourse.julialang.org/t/question-about-cuda-kernels/94345 "2023-02-10T15:33:02Z")

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Hi! I’m struggling to implement the following CUDA kernel: using CUDA using LinearAlgebra function kernel!(A, B, C) X = CUDA.size(A)\[3\] Y = CUDA.size(B)\[3\] for j in 1:X for i in 1:Y @in…

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## [Surprising benchmark results for a basic mixed precision example](https://discourse.julialang.org/t/surprising-benchmark-results-for-a-basic-mixed-precision-example/94410)

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**Author:** [@nvenkov1](https://discourse.julialang.org/u/nvenkov1)\
**Replies:** 1\
**Last updated:** [February 10, 2023, 1:47pm UTC](https://discourse.julialang.org/t/surprising-benchmark-results-for-a-basic-mixed-precision-example/94410 "2023-02-10T13:47:57Z")

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I started to experiment with mixed precision and I benchmarked a basic example as follows: using BenchmarkTools using Quadmath using LinearAlgebra a16 = Vector{Float16}(undef, 100\_000\_000); a32 = Vector{Float32}(undef, …

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## [DiffEqFlux.jl: Questions about Neural ODEs](https://discourse.julialang.org/t/diffeqflux-jl-questions-about-neural-odes/94409)

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**Author:** [@scj](https://discourse.julialang.org/u/scj)\
**Replies:** 1\
**Last updated:** [February 10, 2023, 1:46pm UTC](https://discourse.julialang.org/t/diffeqflux-jl-questions-about-neural-odes/94409 "2023-02-10T13:46:05Z")

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I’m relatively new to both Julia and deep learning. I want to learn the dynamical model of a system using a set of observed trajectories. I’ve heard neural ODEs may be of promise, but they seem quite new, and I haven’t b…

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## [Web server with latency-sensitive and compute-heavy task separate thread pools](https://discourse.julialang.org/t/web-server-with-latency-sensitive-and-compute-heavy-task-separate-thread-pools/93949)

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**Author:** [@simsurace](https://discourse.julialang.org/u/simsurace)\
**Replies:** 12\
**Last updated:** [February 10, 2023, 9:32am UTC](https://discourse.julialang.org/t/web-server-with-latency-sensitive-and-compute-heavy-task-separate-thread-pools/93949 "2023-02-10T09:32:03Z")

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I need to set up a web server that mainly serves requests which are computationally heavy and multithreaded, but should remain responsive to health checks (from a Kubernetes cluster) which are latency sensitive. I want t…

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## [Saving Unitful DataFrame to file](https://discourse.julialang.org/t/saving-unitful-dataframe-to-file/69313)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 8\
**Last updated:** [February 10, 2023, 7:08am UTC](https://discourse.julialang.org/t/saving-unitful-dataframe-to-file/69313 "2023-02-10T07:08:03Z")

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Imagine I have a DataFrame with some of the columns being Unitful. Is there a way to save such a DataFrame into a file while preserving the information about the units? The only solution I can think about is to strip it…

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## [ReverseDiff for loss function with Zygote derivatives](https://discourse.julialang.org/t/reversediff-for-loss-function-with-zygote-derivatives/94382)

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**Author:** [@PatrickMcFarlane](https://discourse.julialang.org/u/PatrickMcFarlane)\
**Replies:** 1\
**Last updated:** [February 10, 2023, 3:30am UTC](https://discourse.julialang.org/t/reversediff-for-loss-function-with-zygote-derivatives/94382 "2023-02-10T03:30:24Z")

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I’m trying to use Flux.jl to find the solution to a function equation with a form a bit like g(f(x)\[1\]) = h(f’(x)), where f(x) is an unkown function to be approximated by a neural network. The loss function for this set…

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## [Can I use user defined data types with ODE?](https://discourse.julialang.org/t/can-i-use-user-defined-data-types-with-ode/94390)

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**Author:** [@shaurya](https://discourse.julialang.org/u/shaurya)\
**Replies:** 2\
**Last updated:** [February 10, 2023, 3:26am UTC](https://discourse.julialang.org/t/can-i-use-user-defined-data-types-with-ode/94390 "2023-02-10T03:26:36Z")

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Can I use user defined data type with ODE function? mutable struct ud a::Float64 b::Float64 end function od!(dx,x,t) dx.= \[1, x.a \]; end ic = ud(1.0,2.0); prob=ODEProblem(od!,ic,(0.0,1.2)); sol1=solve(p…

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## [NLopt :FORCED\_STOP after one iteration Gradient based optimization](https://discourse.julialang.org/t/nlopt-forced-stop-after-one-iteration-gradient-based-optimization/94383)

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**Author:** [@SamerGerges](https://discourse.julialang.org/u/SamerGerges)\
**Replies:** 7\
**Last updated:** [February 10, 2023, 2:33am UTC](https://discourse.julialang.org/t/nlopt-forced-stop-after-one-iteration-gradient-based-optimization/94383 "2023-02-10T02:33:19Z")

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Hello, I am using NLopt to solve an optimization problem with non-linear constraints. I provide the gradients for both the optimization function and the gradient function. Both functions provide the correct values of th…

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## [How to test solvers in JuMP](https://discourse.julialang.org/t/how-to-test-solvers-in-jump/94250)

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**Author:** [@kevinqiao](https://discourse.julialang.org/u/kevinqiao)\
**Replies:** 2\
**Last updated:** [February 10, 2023, 1:42am UTC](https://discourse.julialang.org/t/how-to-test-solvers-in-jump/94250 "2023-02-10T01:42:58Z")

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I have installed JuMP and some solvers, how to test solvers in JuMP, as I want to verify the solvers work well and the correct solution can be obtained. Thanks in advance.

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## [How to optimize trace of matrix inverse with JuMP or Convex?](https://discourse.julialang.org/t/how-to-optimize-trace-of-matrix-inverse-with-jump-or-convex/94167)

<div class="topic-metadata">

**Author:** [@biona001](https://discourse.julialang.org/u/biona001)\
**Replies:** 6\
**Last updated:** [February 10, 2023, 1:03am UTC](https://discourse.julialang.org/t/how-to-optimize-trace-of-matrix-inverse-with-jump-or-convex/94167 "2023-02-10T01:03:43Z")

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Hi community, I want to minimize tr(S^{-1}) + tr((A - S)^{-1}) such that S \\succeq 0 and A - S \\succeq 0 (S is the optimization matrix, A is some fixed positive definite matrix) I tried using JuMP + Hypatia: using Hyp…

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## [Using CuSparseMatrixCSR](https://discourse.julialang.org/t/using-cusparsematrixcsr/94379)

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**Author:** [@shakedregev](https://discourse.julialang.org/u/shakedregev)\
**Replies:** 1\
**Last updated:** [February 9, 2023, 11:09pm UTC](https://discourse.julialang.org/t/using-cusparsematrixcsr/94379 "2023-02-09T23:09:35Z")

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Hi, Based on the CUDA.jl github I tried to create a CuSparseMatrixCSR matrix. I’m sparing the loading of the data, all of the values I input in are defined. using CUDA export CuSparseMatrixCSC, CuSparseMatrixCSR, CuSp…

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## [MTK & vector equations -- get error message on "axes of broadcast not known"](https://discourse.julialang.org/t/mtk-vector-equations-get-error-message-on-axes-of-broadcast-not-known/94343)

<div class="topic-metadata">

**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 9\
**Last updated:** [February 9, 2023, 9:15pm UTC](https://discourse.julialang.org/t/mtk-vector-equations-get-error-message-on-axes-of-broadcast-not-known/94343 "2023-02-09T21:15:23Z")

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OK… I’m finally trying to learn MTK by re-implementing old models from Modelica (i.e., the models work). Now, I’m doing a manual discretization of an advection PDE/simple gas pipe. It is not super realistic, but that is…

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## [What is the difference between variable definition in JuMP like these two ways](https://discourse.julialang.org/t/what-is-the-difference-between-variable-definition-in-jump-like-these-two-ways/94337)

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**Author:** [@Betristor](https://discourse.julialang.org/u/Betristor)\
**Replies:** 4\
**Last updated:** [February 9, 2023, 8:20pm UTC](https://discourse.julialang.org/t/what-is-the-difference-between-variable-definition-in-jump-like-these-two-ways/94337 "2023-02-09T20:20:20Z")

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I got two difinition ways used in my JuMP model. And I encountered some trouble when I try to access their results using value function. A is a variable defined as @variable(M, A\[i = 1:3, t = 1:24\]) and B is like @variab…

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