# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=192

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**Page:** 193

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## [Metalog Distributions](https://discourse.julialang.org/t/metalog-distributions/99259)

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**Author:** [@vshesh](https://discourse.julialang.org/u/vshesh)\
**Replies:** 0\
**Last updated:** [May 23, 2023, 5:16am UTC](https://discourse.julialang.org/t/metalog-distributions/99259 "2023-05-23T05:16:55Z")

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Hi, I am looking to use Metalog Distributions (1 1 The Three Types of Probability Distributions - YouTube) in a project I’m working on. Are there any packages that have implemented them (including fitting to data, and …

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## [Incorporating SVD factorization into GPUs with CUDA](https://discourse.julialang.org/t/incorporating-svd-factorization-into-gpus-with-cuda/99252)

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**Author:** [@jarroyoe](https://discourse.julialang.org/u/jarroyoe)\
**Replies:** 7\
**Last updated:** [May 23, 2023, 2:31am UTC](https://discourse.julialang.org/t/incorporating-svd-factorization-into-gpus-with-cuda/99252 "2023-05-23T02:31:21Z")

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I’m trying to run the following code to optimize the spectral radius of the weight matrices of a neural network: using CUDA, Random, Lux, ComponentArrays, Optimization, OptimizationOptimisers, OptimizationOptimJL, Linea…

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## [ReverseDiff over ForwardDiff behaves strangely with Lux networks (Issue)](https://discourse.julialang.org/t/reversediff-over-forwarddiff-behaves-strangely-with-lux-networks-issue/99175)

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**Author:** [@Bizzi](https://discourse.julialang.org/u/Bizzi)\
**Replies:** 3\
**Last updated:** [May 23, 2023, 2:06am UTC](https://discourse.julialang.org/t/reversediff-over-forwarddiff-behaves-strangely-with-lux-networks-issue/99175 "2023-05-23T02:06:13Z")

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Hello everyone. For my work with PINNs, I am trying to use ReverseDiff to calculate the gradient of a loss function that itself contains a ForwardDiff gradient. It is easy enough to do so with explicitly-parametrized dec…

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## [Nested parallel loops with @spawn](https://discourse.julialang.org/t/nested-parallel-loops-with-spawn/32364)

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**Author:** [@mzilhao](https://discourse.julialang.org/u/mzilhao)\
**Replies:** 13\
**Last updated:** [May 22, 2023, 11:30pm UTC](https://discourse.julialang.org/t/nested-parallel-loops-with-spawn/32364 "2023-05-22T23:30:15Z")

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Hi all, I’m trying to choose the best way of parallelizing my code given the the current options of @spawn and @threads. A toy model for what I’m trying to do is the following: function solve\_model\_serial!(A, Nu, Nx, N…

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## [ABM performance tips](https://discourse.julialang.org/t/abm-performance-tips/99146)

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**Author:** [@sea\_slug](https://discourse.julialang.org/u/sea_slug)\
**Replies:** 5\
**Last updated:** [May 22, 2023, 11:07pm UTC](https://discourse.julialang.org/t/abm-performance-tips/99146 "2023-05-22T23:07:17Z")

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I have a mainly complete ABM built using Agents.jl (awesome package!) which functions as I want (albeit with placeholder parameters) now I am at the point I want to improve the performance of the model, but I am struggli…

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## [Please, how do I remove the key from a colored bar chart? Deadline immenient, help greatly appreciated](https://discourse.julialang.org/t/please-how-do-i-remove-the-key-from-a-colored-bar-chart-deadline-immenient-help-greatly-appreciated/99248)

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**Author:** [@johnabs](https://discourse.julialang.org/u/johnabs)\
**Replies:** 2\
**Last updated:** [May 22, 2023, 10:08pm UTC](https://discourse.julialang.org/t/please-how-do-i-remove-the-key-from-a-colored-bar-chart-deadline-immenient-help-greatly-appreciated/99248 "2023-05-22T22:08:07Z")

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I currently have some separate data frames that aren’t particularly amenable to being combined; but I need to plot them on the same plot but with a single legend/color key. I have done so with the following code, but whe…

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## [Multi-thread Variable Creation](https://discourse.julialang.org/t/multi-thread-variable-creation/93300)

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**Author:** [@A\_M](https://discourse.julialang.org/u/A_M)\
**Replies:** 8\
**Last updated:** [May 22, 2023, 7:27pm UTC](https://discourse.julialang.org/t/multi-thread-variable-creation/93300 "2023-05-22T19:27:43Z")

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I have a large problem; even model creation will take a long time, and I was thinking of using a thread-safe approach to speed up the process. Here is the code: using Random using JuMP using HiGHS using ThreadSafeDicts …

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## [DiffEqFlux throws a CUDA error on installation](https://discourse.julialang.org/t/diffeqflux-throws-a-cuda-error-on-installation/99212)

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**Author:** [@Vidianos](https://discourse.julialang.org/u/Vidianos)\
**Replies:** 6\
**Last updated:** [May 22, 2023, 6:52pm UTC](https://discourse.julialang.org/t/diffeqflux-throws-a-cuda-error-on-installation/99212 "2023-05-22T18:52:18Z")

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Hello, I am trying to get into the SciML ecosystem and as such I installed DiffEqFlux. During installation, I get this error Blockquote DiffEqFlux \[aae7a2af-3d4f-5e19-a356-7da93b79d9d0\] │ ┌ Error: Failed to initial…

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## [Is CUDA.jl and FFTW threadsafe?](https://discourse.julialang.org/t/is-cuda-jl-and-fftw-threadsafe/99219)

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**Author:** [@jpdoane](https://discourse.julialang.org/u/jpdoane)\
**Replies:** 4\
**Last updated:** [May 22, 2023, 2:44pm UTC](https://discourse.julialang.org/t/is-cuda-jl-and-fftw-threadsafe/99219 "2023-05-22T14:44:21Z")

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I am getting the following error when using CUDA.jl FFTW plans in multiple threads. Is this interface not threadsafe? If not, do I just need a mutex around plan\_fft!(), or might the actual fft be not threadsafe as well? …

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## [Normalizing Values and Floating Point Error](https://discourse.julialang.org/t/normalizing-values-and-floating-point-error/99213)

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**Author:** [@ianroddis](https://discourse.julialang.org/u/ianroddis)\
**Replies:** 6\
**Last updated:** [May 22, 2023, 12:04pm UTC](https://discourse.julialang.org/t/normalizing-values-and-floating-point-error/99213 "2023-05-22T12:04:46Z")

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Sorry if this isn’t the right place to post this question, but it was as close as I could think for the intersection of concerns. Most sources I’ve read on data modelling suggest that, when required, values be normalize…

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## [Numeric value substitution into SymPy Symbolic array or matrix](https://discourse.julialang.org/t/numeric-value-substitution-into-sympy-symbolic-array-or-matrix/99204)

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**Author:** [@johannesnauta](https://discourse.julialang.org/u/johannesnauta)\
**Replies:** 5\
**Last updated:** [May 22, 2023, 10:42am UTC](https://discourse.julialang.org/t/numeric-value-substitution-into-sympy-symbolic-array-or-matrix/99204 "2023-05-22T10:42:10Z")

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I am having trouble substituting numerical values into symbolic arrays and matrices. I have read about lambdify, but I still fail to provide numerical values for the arguments in a consistent way. As an example, consid…

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## [Designing a band pass filter with modeling toolkit](https://discourse.julialang.org/t/designing-a-band-pass-filter-with-modeling-toolkit/99118)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 5\
**Last updated:** [May 22, 2023, 6:51am UTC](https://discourse.julialang.org/t/designing-a-band-pass-filter-with-modeling-toolkit/99118 "2023-05-22T06:51:49Z")

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What is the best way to design a band pass filter in the continues domain using modelling toolkit? Some hints how to do it in Python: Butterworth Bandpass — SciPy Cookbook documentation Update: OK, I can design a filte…

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## [Stackoverflow Error in plot of 3D data point](https://discourse.julialang.org/t/stackoverflow-error-in-plot-of-3d-data-point/99093)

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**Author:** [@Movicmatics](https://discourse.julialang.org/u/Movicmatics)\
**Replies:** 8\
**Last updated:** [May 22, 2023, 12:25am UTC](https://discourse.julialang.org/t/stackoverflow-error-in-plot-of-3d-data-point/99093 "2023-05-22T00:25:30Z")

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Hello everyone, I am trying to run my code but I am encountering an error, I would be glad if help can be render. The Error mesage is: ERROR: StackOverflowError: Stacktrace: \[1\] RecipesPipeline.Volume(v::Array{Floa…

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## [Radial basis functions in surrogates.jl?](https://discourse.julialang.org/t/radial-basis-functions-in-surrogates-jl/99144)

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**Author:** [@rkube](https://discourse.julialang.org/u/rkube)\
**Replies:** 4\
**Last updated:** [May 21, 2023, 9:47pm UTC](https://discourse.julialang.org/t/radial-basis-functions-in-surrogates-jl/99144 "2023-05-21T21:47:54Z")

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Hi, I’m trying to understand what RBFs Surrogates.jl is using. For example, the documentation only specifies that it uses RadialBasis . The \[code\] specifies that there is a linearRadial and cubicRadial. What equation is…

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## [Chains vs iterations behavior in Turing sampler (conditional priors)](https://discourse.julialang.org/t/chains-vs-iterations-behavior-in-turing-sampler-conditional-priors/99165)

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**Author:** [@PeX](https://discourse.julialang.org/u/PeX)\
**Replies:** 8\
**Last updated:** [May 21, 2023, 9:02pm UTC](https://discourse.julialang.org/t/chains-vs-iterations-behavior-in-turing-sampler-conditional-priors/99165 "2023-05-21T21:02:51Z")

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I wrote a simple model that looks like this: @model function stam() # Prior distributions op = \[1.0, 2.0, 3.0, 4.0\] α ~ DiscreteUniform(1, length(op)) β ~ truncated(Normal(op\[α\] , 0.1); lower=0.01, upper=10.0)…

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## [Eigenvalue ordering unexpectedly different in two cases](https://discourse.julialang.org/t/eigenvalue-ordering-unexpectedly-different-in-two-cases/99189)

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**Author:** [@Nikos\_Gianniotis](https://discourse.julialang.org/u/Nikos_Gianniotis)\
**Replies:** 2\
**Last updated:** [May 21, 2023, 8:52pm UTC](https://discourse.julialang.org/t/eigenvalue-ordering-unexpectedly-different-in-two-cases/99189 "2023-05-21T20:52:23Z")

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Hello everyone, I am probably making a subtle mistake or assumption somewhere as I cannot understand why the following two eigendecompositions do not return the eigenvalues in the same order. Could somebody please expla…

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## [How to create ASCII equations](https://discourse.julialang.org/t/how-to-create-ascii-equations/99180)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 4\
**Last updated:** [May 21, 2023, 8:33pm UTC](https://discourse.julialang.org/t/how-to-create-ascii-equations/99180 "2023-05-21T20:33:06Z")

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In the documentation of ModelingToolkit I find a lot of ASCII equations, e.g. k ─────── sT + 1 Is there a way to generate this ascii art automatically? I looked at latexify, but I did not find an option to generate …

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## [Solving unbounded problem by NeuralPDE](https://discourse.julialang.org/t/solving-unbounded-problem-by-neuralpde/99169)

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**Author:** [@Ethan\_Tran](https://discourse.julialang.org/u/Ethan_Tran)\
**Replies:** 6\
**Last updated:** [May 21, 2023, 6:36pm UTC](https://discourse.julialang.org/t/solving-unbounded-problem-by-neuralpde/99169 "2023-05-21T18:36:45Z")

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I would like to solve an unbounded problem in PDE format by NeuralPDE. The domains of the problem is x belong \[0;inf) and y belong real number (R) please help me on how could I implement these domains in Julia and whet…

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## [Help to plot a surface plot with infinite roots?](https://discourse.julialang.org/t/help-to-plot-a-surface-plot-with-infinite-roots/98291)

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**Author:** [@Moslem\_Uddin](https://discourse.julialang.org/u/Moslem_Uddin)\
**Replies:** 10\
**Last updated:** [May 21, 2023, 6:18pm UTC](https://discourse.julialang.org/t/help-to-plot-a-surface-plot-with-infinite-roots/98291 "2023-05-21T18:18:02Z")

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I am trying to generate a surface plot of the following in Julia. As I’m new, I’m struggling where \\alpha\_k are I’m being able to generate a line plot at a fixed time using the following code: using Roots,Plots plot…

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## [Julia supported by LangChain?](https://discourse.julialang.org/t/julia-supported-by-langchain/98509)

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**Author:** [@Alex\_Tantos](https://discourse.julialang.org/u/Alex_Tantos)\
**Replies:** 14\
**Last updated:** [May 21, 2023, 5:27pm UTC](https://discourse.julialang.org/t/julia-supported-by-langchain/98509 "2023-05-21T17:27:21Z")

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Hi there! Is anyone aware of any attempts/plans by LangChain to support julia? Any answer will be greatly appreciated! Best! Alex

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## [Histogram with Y-axis in log-scale](https://discourse.julialang.org/t/histogram-with-y-axis-in-log-scale/99183)

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**Author:** [@parf](https://discourse.julialang.org/u/parf)\
**Replies:** 1\
**Last updated:** [May 21, 2023, 2:10pm UTC](https://discourse.julialang.org/t/histogram-with-y-axis-in-log-scale/99183 "2023-05-21T14:10:22Z")

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Hi all, I want to plot histogram with Y-axis in log-scale. So, I do the following: using Plots gr() histogram(r\_pos\*L/n, normed=:pdf, bins=0.0:0.012:0.8, yaxis=:log10, ylim=(1e-3,10)) How to make the bins filling …

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## [Probablistic modeling of multiagent systems?](https://discourse.julialang.org/t/probablistic-modeling-of-multiagent-systems/95689)

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**Author:** [@DanielV](https://discourse.julialang.org/u/DanielV)\
**Replies:** 5\
**Last updated:** [May 21, 2023, 12:44pm UTC](https://discourse.julialang.org/t/probablistic-modeling-of-multiagent-systems/95689 "2023-05-21T12:44:14Z")

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I have a simple agents.jl sim where at each step with some probability agents are added or change state or are removed. Agents are not independent, e.g., there is a finite “capacity” resource which might prevent an agent…

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## [Solving Ax = b s.t. x contains all positive values](https://discourse.julialang.org/t/solving-ax-b-s-t-x-contains-all-positive-values/99138)

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**Author:** [@dleather](https://discourse.julialang.org/u/dleather)\
**Replies:** 4\
**Last updated:** [May 20, 2023, 8:00am UTC](https://discourse.julialang.org/t/solving-ax-b-s-t-x-contains-all-positive-values/99138 "2023-05-20T08:00:11Z")

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I am solving an asset pricing equations via discretizing an underlying Markov process, X \\in R^d, resulting in \\tilde{X} \\sim \\Pi, where \\Pi is a transition matrix whose rows sum to unity, and all entries in \[0,1\]. Let \\…

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## [Implementing Gibbs sampler for ODE parameter estimation](https://discourse.julialang.org/t/implementing-gibbs-sampler-for-ode-parameter-estimation/99132)

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**Author:** [@PeX](https://discourse.julialang.org/u/PeX)\
**Replies:** 2\
**Last updated:** [May 20, 2023, 8:58pm UTC](https://discourse.julialang.org/t/implementing-gibbs-sampler-for-ode-parameter-estimation/99132 "2023-05-20T20:58:14Z")

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I would like to use a Gibbs sampler for a model that looks like this (in Turing.jl): @model function fit\_burger2(data::AbstractVector, prob) # Prior distributions σᵣ = 1.5e6 Aₘ ~ truncated(Normal(0.1, 0.05); lo…

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## [Implementation of graphical lasso with Cholesky factor](https://discourse.julialang.org/t/implementation-of-graphical-lasso-with-cholesky-factor/99016)

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**Author:** [@mleprovost](https://discourse.julialang.org/u/mleprovost)\
**Replies:** 2\
**Last updated:** [May 20, 2023, 3:47pm UTC](https://discourse.julialang.org/t/implementation-of-graphical-lasso-with-cholesky-factor/99016 "2023-05-20T15:47:02Z")

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Hello, I am working on an implementation of the graphical Lasso (Glasso) (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3019769/pdf/kxm045.pdf) in pure Julia. In the algorithm, we have to use a square root of sample cova…

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## [Strange results when using seed kwarg in solve function](https://discourse.julialang.org/t/strange-results-when-using-seed-kwarg-in-solve-function/99128)

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**Author:** [@stochasticguy](https://discourse.julialang.org/u/stochasticguy)\
**Replies:** 2\
**Last updated:** [May 20, 2023, 12:58pm UTC](https://discourse.julialang.org/t/strange-results-when-using-seed-kwarg-in-solve-function/99128 "2023-05-20T12:58:13Z")

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Hi everyone, First of all I wanted to congratulate you all for this amazing community. I’m having issues with the solution of a Stochastic Differential Equation (SDE) when passing the seed kwarg to the solve method. W…

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## [Zerocrossing detection with ModelingToolkit](https://discourse.julialang.org/t/zerocrossing-detection-with-modelingtoolkit/99150)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 1\
**Last updated:** [May 20, 2023, 8:22am UTC](https://discourse.julialang.org/t/zerocrossing-detection-with-modelingtoolkit/99150 "2023-05-20T08:22:19Z")

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I Simulink many components have the option to turn “zero crossing detection” on or off, which has a large influence on the simulation time, stability and accuracy. How is this issue handled in ModelingToolkit?

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## [Periodic Callback and Sensitivity](https://discourse.julialang.org/t/periodic-callback-and-sensitivity/99057)

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**Author:** [@Guido\_Ballabio](https://discourse.julialang.org/u/Guido_Ballabio)\
**Replies:** 5\
**Last updated:** [May 19, 2023, 8:40pm UTC](https://discourse.julialang.org/t/periodic-callback-and-sensitivity/99057 "2023-05-19T20:40:30Z")

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I am trying to use DiffEq and SciML sensitivity to build NN controllers for physical systems. Usually everything works, however this time I need to design a fixed-frequency controller so I’ve reached to PeriodCallback w…

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## [Error During Test in wmma.jl](https://discourse.julialang.org/t/error-during-test-in-wmma-jl/99035)

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**Author:** [@huiyuxie](https://discourse.julialang.org/u/huiyuxie)\
**Replies:** 2\
**Last updated:** [May 19, 2023, 8:11pm UTC](https://discourse.julialang.org/t/error-during-test-in-wmma-jl/99035 "2023-05-19T20:11:10Z")

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Hi! I run test CUDA to ensure that everything works as expected. But some errors occurred as below. Are these errors related to the test file or the configuration of the system? How can I resolve them? Thanks! I have…

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## [MethodError in Turing.jl](https://discourse.julialang.org/t/methoderror-in-turing-jl/99075)

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**Author:** [@PeX](https://discourse.julialang.org/u/PeX)\
**Replies:** 2\
**Last updated:** [May 19, 2023, 6:41pm UTC](https://discourse.julialang.org/t/methoderror-in-turing-jl/99075 "2023-05-19T18:41:28Z")

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I’m trying to do a Bayesian inference to the following ODE system: function ice(du, u, p, t) εₘ, εₖ, σ, F, d, ε = u Aₘ, Qₘ, n, pₘ, R, T, Eₖ, Eₘ, η, dₛₛ, Fₛₛ, ε₁, ε₂, S = p du\[1\] = Aₘ \* (σ/F)^n \* d^(-pₘ) \* ℯ^(-Qₘ/(…

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