# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=159

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**Page:** 160

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## [How to detect oscillations/characteristic frequencies in data?](https://discourse.julialang.org/t/how-to-detect-oscillations-characteristic-frequencies-in-data/105169)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 5\
**Last updated:** [October 19, 2023, 7:37pm UTC](https://discourse.julialang.org/t/how-to-detect-oscillations-characteristic-frequencies-in-data/105169 "2023-10-19T19:37:33Z")

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I have a (many) signal I have gotten from experiments. The extent can be argued, but I’d definitely say there is something pulsing/oscillatory going on: using Plots plot(signal) How do I actually show this though? I …

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## [Inconsitent gradients of BachNorm on GPU in testmode](https://discourse.julialang.org/t/inconsitent-gradients-of-bachnorm-on-gpu-in-testmode/105189)

<div class="topic-metadata">

**Author:** [@Phypix](https://discourse.julialang.org/u/Phypix)\
**Replies:** 0\
**Last updated:** [October 19, 2023, 2:49pm UTC](https://discourse.julialang.org/t/inconsitent-gradients-of-bachnorm-on-gpu-in-testmode/105189 "2023-10-19T14:49:11Z")

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I encountered an issue with the gradient of the BatchNorm on the GPU in testmode. If the shape of the input array is either 2, 4 or 5, the gradients will differ from the result of any other sized array. The results on t…

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## [Julia script for datamining timeseries from Yahoo Finance](https://discourse.julialang.org/t/julia-script-for-datamining-timeseries-from-yahoo-finance/105177)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 3\
**Last updated:** [October 19, 2023, 11:32am UTC](https://discourse.julialang.org/t/julia-script-for-datamining-timeseries-from-yahoo-finance/105177 "2023-10-19T11:32:34Z")

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Hey guys, some students of mine are working on applying timeseries analysis tools (from JuliaDynamics) to stock market timeseries. I am wondering if anyone has an already made Julia script for downloading (e.g.,) SnP500 …

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## [PRIMA: a package for solving general nonlinear optimization problems without using derivatives](https://discourse.julialang.org/t/prima-a-package-for-solving-general-nonlinear-optimization-problems-without-using-derivatives/105134)

<div class="topic-metadata">

**Author:** [@Zaikun](https://discourse.julialang.org/u/Zaikun)\
**Replies:** 4\
**Last updated:** [October 19, 2023, 2:05am UTC](https://discourse.julialang.org/t/prima-a-package-for-solving-general-nonlinear-optimization-problems-without-using-derivatives/105134 "2023-10-19T02:05:19Z")

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Hi everyone, I am very glad to announce PRIMA, a package for solving general nonlinear optimization problems without using derivatives. PRIMA provides the reference implementation for M.J.D. Powell’s renowned derivativ…

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## [Makie - how to align text in a Button](https://discourse.julialang.org/t/makie-how-to-align-text-in-a-button/104685)

<div class="topic-metadata">

**Author:** [@ultradian](https://discourse.julialang.org/u/ultradian)\
**Replies:** 4\
**Last updated:** [October 18, 2023, 7:24pm UTC](https://discourse.julialang.org/t/makie-how-to-align-text-in-a-button/104685 "2023-10-18T19:24:26Z")

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How do you align text in a Button? I didn’t see any way to do it in the docs. Only using valign and halign to align the button in its bbox. In a related question, I tried to change the padding, but didn’t notice an effe…

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## [How to efficiently empty Makie figure / delete widgets?](https://discourse.julialang.org/t/how-to-efficiently-empty-makie-figure-delete-widgets/103612)

<div class="topic-metadata">

**Author:** [@ffevotte](https://discourse.julialang.org/u/ffevotte)\
**Replies:** 22\
**Last updated:** [October 18, 2023, 5:31pm UTC](https://discourse.julialang.org/t/how-to-efficiently-empty-makie-figure-delete-widgets/103612 "2023-10-18T17:31:34Z")

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I’m very new to Makie, so there is probably something I did not understand. I’m trying to build some sort of UI with Makie, in which the number of widgets will change over time. In order to handle this I tried an approa…

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## [Plots and display](https://discourse.julialang.org/t/plots-and-display/105060)

<div class="topic-metadata">

**Author:** [@harven](https://discourse.julialang.org/u/harven)\
**Replies:** 7\
**Last updated:** [October 18, 2023, 2:29pm UTC](https://discourse.julialang.org/t/plots-and-display/105060 "2023-10-18T14:29:52Z")

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I am doing a cheap animation by displaying a plot every 1/60th of a second using the Plots package. Unfortunately, it is not very fast. It happens that this is the call to the display function that is slow. This can be …

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## [Finding some undocumented JuMP optimizers](https://discourse.julialang.org/t/finding-some-undocumented-jump-optimizers/105102)

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**Author:** [@Tarny\_GG\_Channie](https://discourse.julialang.org/u/Tarny_GG_Channie)\
**Replies:** 1\
**Last updated:** [October 18, 2023, 11:04am UTC](https://discourse.julialang.org/t/finding-some-undocumented-jump-optimizers/105102 "2023-10-18T11:04:38Z")

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Sometimes, the developers did not add the solver to the documentation. However, if JuMP is a hub for optimization solvers, we might consider adding them. Searching for Ising optimization, I found one. https://github.co…

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## [DynamicalSystems.jl and CUDA.jl](https://discourse.julialang.org/t/dynamicalsystems-jl-and-cuda-jl/105111)

<div class="topic-metadata">

**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 0\
**Last updated:** [October 18, 2023, 10:31am UTC](https://discourse.julialang.org/t/dynamicalsystems-jl-and-cuda-jl/105111 "2023-10-18T10:31:13Z")

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Hello! Can i use CUDAj.jl and DynamicalSystems.jl together? I calculate map of spectrum Lyapunov exponents with inheritance of initial conditions. I manage to parallelize calculations using Threads.@threads for loop. B…

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## [Change initial condition by set\_state! DynamicalSystems.jl](https://discourse.julialang.org/t/change-initial-condition-by-set-state-dynamicalsystems-jl/105064)

<div class="topic-metadata">

**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 8\
**Last updated:** [October 18, 2023, 9:43am UTC](https://discourse.julialang.org/t/change-initial-condition-by-set-state-dynamicalsystems-jl/105064 "2023-10-18T09:43:18Z")

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Hello! I’m trying to change the initial condition using the set\_state! function and I integrate the system, but when I do this, I see that the initial state has not changed. Why doesn’t the initial condition change? Sho…

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## [Maximum Codimension using BifurcationKit.jl](https://discourse.julialang.org/t/maximum-codimension-using-bifurcationkit-jl/105087)

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**Author:** [@Rafalel\_Jupio](https://discourse.julialang.org/u/Rafalel_Jupio)\
**Replies:** 7\
**Last updated:** [October 18, 2023, 9:15am UTC](https://discourse.julialang.org/t/maximum-codimension-using-bifurcationkit-jl/105087 "2023-10-18T09:15:16Z")

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Hello everyone! I am pretty new to Julia, but I have project for which I have to analyse a bifurcation behaviour with codimension 3 for a DDE model. Hence I was wondering if BifurcationKit.jl could handle this, since in…

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## [100X tensor algebra speedup!?!](https://discourse.julialang.org/t/100x-tensor-algebra-speedup/6807)

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**Author:** [@TravisA9](https://discourse.julialang.org/u/TravisA9)\
**Replies:** 44\
**Last updated:** [October 18, 2023, 3:10am UTC](https://discourse.julialang.org/t/100x-tensor-algebra-speedup/6807 "2023-10-18T03:10:33Z")

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Found a very interesting article: System for performing ‘tensor algebra’ offers 100-fold speedups over previous software packages I am a newbie in linear algebra but this sounds like something that would be nice to imp…

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## [Scip optimizer presolver components takes too long to optimize matrix](https://discourse.julialang.org/t/scip-optimizer-presolver-components-takes-too-long-to-optimize-matrix/105066)

<div class="topic-metadata">

**Author:** [@mrFox](https://discourse.julialang.org/u/mrFox)\
**Replies:** 1\
**Last updated:** [October 17, 2023, 11:57pm UTC](https://discourse.julialang.org/t/scip-optimizer-presolver-components-takes-too-long-to-optimize-matrix/105066 "2023-10-17T23:57:32Z")

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there are two milp problems. When I use gurobi optimizer they are calculated quite quickly: 263s for matrix 1 and 139s for matrix 2. If I use scip optimizer with parallel extension fiberscip the solution cannot be found.…

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## [Primal/dual optimization scaling for numerical stability](https://discourse.julialang.org/t/primal-dual-optimization-scaling-for-numerical-stability/105083)

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**Author:** [@jacob-roth](https://discourse.julialang.org/u/jacob-roth)\
**Replies:** 1\
**Last updated:** [October 17, 2023, 11:51pm UTC](https://discourse.julialang.org/t/primal-dual-optimization-scaling-for-numerical-stability/105083 "2023-10-17T23:51:36Z")

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I am solving a convex QP via ALM and am using Gurobi.jl for benchmarking. I noticed that Gurobi implements some problem scaling techniques (slightly more detail here: https://support.gurobi.com/hc/en-us/community/posts/1…

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## [3D expression in JuMP](https://discourse.julialang.org/t/3d-expression-in-jump/105014)

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**Author:** [@papar](https://discourse.julialang.org/u/papar)\
**Replies:** 3\
**Last updated:** [October 17, 2023, 9:37pm UTC](https://discourse.julialang.org/t/3d-expression-in-jump/105014 "2023-10-17T21:37:48Z")

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I want to build the following expression in the optimisation problem defined below. A\_{i0s} = x\_i A\_{its} = A\_{i,t-1,s} + y\_{its} - z\_{its} \\quad \\forall s, \\forall i, \\forall t \> 0 I have given the code that I tr…

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## [Help to perform scatter density plot with Plots.jl](https://discourse.julialang.org/t/help-to-perform-scatter-density-plot-with-plots-jl/72790)

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**Author:** [@bienpierre](https://discourse.julialang.org/u/bienpierre)\
**Replies:** 9\
**Last updated:** [October 17, 2023, 5:24pm UTC](https://discourse.julialang.org/t/help-to-perform-scatter-density-plot-with-plots-jl/72790 "2023-10-17T17:24:59Z")

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Dear all, I would like to perform a scatter density plot with Plots.jl, such as: scatter density: Two way explored : package : KernelDensity.jl, usable to perform some kind of contour plots; There is also the histo…

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## [AIP has a call for papers for software in Chemical Physics](https://discourse.julialang.org/t/aip-has-a-call-for-papers-for-software-in-chemical-physics/105063)

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**Author:** [@Knud\_Sorensen](https://discourse.julialang.org/u/Knud_Sorensen)\
**Replies:** 1\
**Last updated:** [October 17, 2023, 2:38pm UTC](https://discourse.julialang.org/t/aip-has-a-call-for-papers-for-software-in-chemical-physics/105063 "2023-10-17T14:38:44Z")

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Maybe a chance to show some julia code.

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## [Bruce Hansen's "Econometrics"](https://discourse.julialang.org/t/bruce-hansens-econometrics/104324)

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**Author:** [@Paul\_Soderlind](https://discourse.julialang.org/u/Paul_Soderlind)\
**Replies:** 4\
**Last updated:** [October 17, 2023, 12:53pm UTC](https://discourse.julialang.org/t/bruce-hansens-econometrics/104324 "2023-10-17T12:53:09Z")

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looks to be the next standard text for PhD econometrics. It has a number of empirical examples (in R, Stata and matlab), with code and data here: Bruce Hansen's Econometrics It shouldn’t be too hard to port the matlab c…

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## [JSServe crashing when recording plot of matrix views](https://discourse.julialang.org/t/jsserve-crashing-when-recording-plot-of-matrix-views/105053)

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**Author:** [@sceptri](https://discourse.julialang.org/u/sceptri)\
**Replies:** 0\
**Last updated:** [October 17, 2023, 9:26am UTC](https://discourse.julialang.org/t/jsserve-crashing-when-recording-plot-of-matrix-views/105053 "2023-10-17T09:26:59Z")

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Hello everyone, consider the following MWE code using Observables, JSServe, WGLMakie, Markdown App() do session::Session n = Slider(5:10) xs = 1:10 ys = rand(length(xs)) fig = Figure() axis = Axis(fig\[1,1\]) xs…

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## [Improving performance for training Universal Differential Equation](https://discourse.julialang.org/t/improving-performance-for-training-universal-differential-equation/105038)

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**Author:** [@rkube](https://discourse.julialang.org/u/rkube)\
**Replies:** 3\
**Last updated:** [October 17, 2023, 7:18am UTC](https://discourse.julialang.org/t/improving-performance-for-training-universal-differential-equation/105038 "2023-10-17T07:18:22Z")

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Hi, I’m trying to understand the performance bottlenecks in training universal differential equations. Following this guide, benchmarking the training shows that optimizing the parameters of the Lux network requires a l…

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## [Need to find out all eigenvalues and vectors of large Hermitian matrices](https://discourse.julialang.org/t/need-to-find-out-all-eigenvalues-and-vectors-of-large-hermitian-matrices/105048)

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**Author:** [@AliceandBob](https://discourse.julialang.org/u/AliceandBob)\
**Replies:** 1\
**Last updated:** [October 17, 2023, 5:25am UTC](https://discourse.julialang.org/t/need-to-find-out-all-eigenvalues-and-vectors-of-large-hermitian-matrices/105048 "2023-10-17T05:25:40Z")

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Hi. I need to find out ALL the eigenvalues and eigenvectors of large Hermitian matrices. Half of the entries are zeros so maybe it is worth using the sparse matrix. I am now using eigen() from the standard library Linear…

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## [Using MVector in CUDA without memory errors](https://discourse.julialang.org/t/using-mvector-in-cuda-without-memory-errors/105016)

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**Author:** [@snowgum](https://discourse.julialang.org/u/snowgum)\
**Replies:** 3\
**Last updated:** [October 17, 2023, 2:46am UTC](https://discourse.julialang.org/t/using-mvector-in-cuda-without-memory-errors/105016 "2023-10-17T02:46:19Z")

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I have an application where allocating a small fixed-sized vector for temporary storage inside a kernel is very beneficial. From reading this forum, issue 340 on CUDAnative.jl and an issue 38 comment, I am assuming it is…

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## [Latex in Luxor](https://discourse.julialang.org/t/latex-in-luxor/78985)

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**Author:** [@marcfish](https://discourse.julialang.org/u/marcfish)\
**Replies:** 11\
**Last updated:** [October 16, 2023, 11:48pm UTC](https://discourse.julialang.org/t/latex-in-luxor/78985 "2023-10-16T23:48:45Z")

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i want to text latex in luxor but it seems wrong with fonts ther is the code: using Luxor using MathTeXEngine @svg begin background("khaki") f(t) = Point(4cos(t) + 2cos(5t), 4sin(t) + 2sin(5t)) setline(15) fontsize(3…

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## [NeuralPDE features and GPU compatibility](https://discourse.julialang.org/t/neuralpde-features-and-gpu-compatibility/104870)

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**Author:** [@PetrosStefanou](https://discourse.julialang.org/u/PetrosStefanou)\
**Replies:** 9\
**Last updated:** [October 16, 2023, 4:55pm UTC](https://discourse.julialang.org/t/neuralpde-features-and-gpu-compatibility/104870 "2023-10-16T16:55:40Z")

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Hello everyone. I am new to Julia, but somewhat experienced in physics-informed neural networks. I have some questions about several features of NeuralPDE, their compatibility with GPUs and some choices made in the exam…

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## [What is the difference between nonlinear "functions with vector outputs" and nonlinear "operators with vector outputs"?](https://discourse.julialang.org/t/what-is-the-difference-between-nonlinear-functions-with-vector-outputs-and-nonlinear-operators-with-vector-outputs/105012)

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**Author:** [@justinberi](https://discourse.julialang.org/u/justinberi)\
**Replies:** 2\
**Last updated:** [October 16, 2023, 3:13pm UTC](https://discourse.julialang.org/t/what-is-the-difference-between-nonlinear-functions-with-vector-outputs-and-nonlinear-operators-with-vector-outputs/105012 "2023-10-16T15:13:57Z")

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The JuMP documentation and this answer suggests that nonlinear user-defined functions with vector outputs need to be defined using many @operators. The documentation actually says “User-defined operators …”. This post …

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## [Dynamic selection of columns Query.jl](https://discourse.julialang.org/t/dynamic-selection-of-columns-query-jl/79526)

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**Author:** [@davide-f](https://discourse.julialang.org/u/davide-f)\
**Replies:** 4\
**Last updated:** [October 16, 2023, 2:56pm UTC](https://discourse.julialang.org/t/dynamic-selection-of-columns-query-jl/79526 "2023-10-16T14:56:25Z")

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Dear Community, I am trying to dynamically select columns using Query.jl like in the following script, but I am unable to do so. Any ideas? Thank you list\_cols = \[“col1”, “col2”…\] select = df |\> @select(∈(list\_cols)…

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## [Makie PairPlot](https://discourse.julialang.org/t/makie-pairplot/39298)

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**Author:** [@Dustin\_Hess](https://discourse.julialang.org/u/Dustin_Hess)\
**Replies:** 7\
**Last updated:** [October 16, 2023, 1:56pm UTC](https://discourse.julialang.org/t/makie-pairplot/39298 "2023-10-16T13:56:30Z")

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Hi all I am trying to make a pairplot similar to what you get with the Seaborn library but with Makie. I am using MakieLayouts and StatsMakie. I am using the classic Iris data to test it before using it elsewhere. The …

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## [@constraint with ForwardDiff.gradient](https://discourse.julialang.org/t/constraint-with-forwarddiff-gradient/104949)

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**Author:** [@justinberi](https://discourse.julialang.org/u/justinberi)\
**Replies:** 3\
**Last updated:** [October 16, 2023, 1:05pm UTC](https://discourse.julialang.org/t/constraint-with-forwarddiff-gradient/104949 "2023-10-16T13:05:56Z")

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Hi All, Thanks in advance for any help and suggestions. I’m new to Julia (and JuMP) so go easy. Is there a way to use ForwardDiff.gradient within a nonlinear constraint in JuMP? An example is # Solve using JuMP inter…

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## [Proportion plot in CairoMakie](https://discourse.julialang.org/t/proportion-plot-in-cairomakie/104743)

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**Author:** [@alicepiller](https://discourse.julialang.org/u/alicepiller)\
**Replies:** 4\
**Last updated:** [October 16, 2023, 1:01pm UTC](https://discourse.julialang.org/t/proportion-plot-in-cairomakie/104743 "2023-10-16T13:01:16Z")

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I am trying to make a proportion plot, where the x-axis is the year (2000 - 2004) and the y-axis is from 0 - 1. Each bar has a height of 1 and should be stacked to show the proportion of the different health score catego…

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## [MethodError: no method matching -(::SymbolicUtils.BasicSymbolic{Real}, ::Symbolics.Equation)](https://discourse.julialang.org/t/methoderror-no-method-matching-symbolicutils-basicsymbolic-real-symbolics-equation/105005)

<div class="topic-metadata">

**Author:** [@sabbraxcaddabra](https://discourse.julialang.org/u/sabbraxcaddabra)\
**Replies:** 2\
**Last updated:** [October 16, 2023, 10:43am UTC](https://discourse.julialang.org/t/methoderror-no-method-matching-symbolicutils-basicsymbolic-real-symbolics-equation/105005 "2023-10-16T10:43:37Z")

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Hello everyone! I try to model simple internal ballistics model in ModelingToolkit.jl framework. using ModelingToolkit, DifferentialEquations, Plots begin @variables t D = Differential(t) end function terminate\_affect…

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