# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=168

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**Page:** 169

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## [Second order derivatives with ChainRules](https://discourse.julialang.org/t/second-order-derivatives-with-chainrules/103606)

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**Author:** [@mariusd](https://discourse.julialang.org/u/mariusd)\
**Replies:** 1\
**Last updated:** [September 7, 2023, 1:48pm UTC](https://discourse.julialang.org/t/second-order-derivatives-with-chainrules/103606 "2023-09-07T13:48:54Z")

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How can I get the second order derivarive of a function using ChainRules? Bellow is my approach for the sin function. See the following code: using ChainRules using ChainRulesCore # from the docs, first derivative of …

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## [GLMakie + 4K displays](https://discourse.julialang.org/t/glmakie-4k-displays/103590)

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**Author:** [@lgmendesDynamics](https://discourse.julialang.org/u/lgmendesDynamics)\
**Replies:** 1\
**Last updated:** [September 7, 2023, 5:57am UTC](https://discourse.julialang.org/t/glmakie-4k-displays/103590 "2023-09-07T05:57:24Z")

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Is there a correspondent option in GLMakie for the px\_per\_unit in the CairoMakie? To have good quality images (sharper) in a 4K display, I need to set px\_per\_unit=4 in CairoMakie. Currently (default configuration) the…

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## [How to use ParentScope with arrays](https://discourse.julialang.org/t/how-to-use-parentscope-with-arrays/103579)

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**Author:** [@contradict](https://discourse.julialang.org/u/contradict)\
**Replies:** 2\
**Last updated:** [September 6, 2023, 5:49pm UTC](https://discourse.julialang.org/t/how-to-use-parentscope-with-arrays/103579 "2023-09-06T17:49:10Z")

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This used to work in ModelingToolkit 8.65.0 but stopped in 8.66.0. Was it ever supposed to work? Is there a way to move array variables up the hierarchy? @parameters a\[1:2\]=\[1, 2\] b=4 c=1 @variables t x(t)=ParentScope(a…

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## [What are the advantages of using ModelingToolkit to make and solve ODEProblems?](https://discourse.julialang.org/t/what-are-the-advantages-of-using-modelingtoolkit-to-make-and-solve-odeproblems/103563)

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**Author:** [@markjholmes](https://discourse.julialang.org/u/markjholmes)\
**Replies:** 7\
**Last updated:** [September 6, 2023, 5:07pm UTC](https://discourse.julialang.org/t/what-are-the-advantages-of-using-modelingtoolkit-to-make-and-solve-odeproblems/103563 "2023-09-06T17:07:42Z")

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For context, I come from an R background using the deSolve package. The first examples for ModelingToolkit make use of a specific structure of model definition, using the @parameters, @variables, @named macros. The gene…

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## [Lines outside the box of Axis3 CairoMakie](https://discourse.julialang.org/t/lines-outside-the-box-of-axis3-cairomakie/103566)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 3\
**Last updated:** [September 6, 2023, 3:38pm UTC](https://discourse.julialang.org/t/lines-outside-the-box-of-axis3-cairomakie/103566 "2023-09-06T15:38:56Z")

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Hello, i have image: I using xlims and ylims and get image: How can i fix lines which outside the box? Thank you for helps

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## [Is there a Julia function that returns h5 group structures à la h5dump?](https://discourse.julialang.org/t/is-there-a-julia-function-that-returns-h5-group-structures-a-la-h5dump/102778)

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**Author:** [@alex-s-gardner](https://discourse.julialang.org/u/alex-s-gardner)\
**Replies:** 10\
**Last updated:** [September 6, 2023, 8:18am UTC](https://discourse.julialang.org/t/is-there-a-julia-function-that-returns-h5-group-structures-a-la-h5dump/102778 "2023-09-06T08:18:21Z")

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I’m looking for a function that maps h5 data structures, i.e. variable paths, names and Types, and attribute paths, names and Types. This would be similar to h5dump.

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## [Custom Flux Layer Connect](https://discourse.julialang.org/t/custom-flux-layer-connect/36262)

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**Author:** [@TobiS](https://discourse.julialang.org/u/TobiS)\
**Replies:** 3\
**Last updated:** [September 6, 2023, 7:56am UTC](https://discourse.julialang.org/t/custom-flux-layer-connect/36262 "2023-09-06T07:56:19Z")

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Hello everyone, I would like to implement the architecture of N-BEATS network (https://arxiv.org/pdf/1905.10437.pdf) in julia Flux. A simple example of a part of the architecture is shown in the following figure. Is…

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## [Handling prematurely terminated ODE integration in parameter estimation](https://discourse.julialang.org/t/handling-prematurely-terminated-ode-integration-in-parameter-estimation/103514)

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**Author:** [@Neodym](https://discourse.julialang.org/u/Neodym)\
**Replies:** 3\
**Last updated:** [September 5, 2023, 10:25pm UTC](https://discourse.julialang.org/t/handling-prematurely-terminated-ode-integration-in-parameter-estimation/103514 "2023-09-05T22:25:30Z")

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Hi, I’m trying to estimate parameters of an ODE model using DifferentialEquations, SciMLSensitivity, and Optimization packages. In particular, I’ve found that Ipopt works quite well for my problem. Sometimes, though, t…

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## [Sort elements by frequency in julia](https://discourse.julialang.org/t/sort-elements-by-frequency-in-julia/103433)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 4\
**Last updated:** [September 5, 2023, 9:21pm UTC](https://discourse.julialang.org/t/sort-elements-by-frequency-in-julia/103433 "2023-09-05T21:21:20Z")

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I want to sort elements by frequency . For example let x = \["a", "d", "d", "c", "c", "c", "f", "b", "b" ,"b", "b"\] I want to have output sorted as x = \["b", "b" ,"b", "b","c", "c", "c, "d", "d", "a", "f"\] where we ha…

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## [A native Julia package for satellite images?](https://discourse.julialang.org/t/a-native-julia-package-for-satellite-images/44689)

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**Author:** [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)\
**Replies:** 20\
**Last updated:** [September 5, 2023, 8:44pm UTC](https://discourse.julialang.org/t/a-native-julia-package-for-satellite-images/44689 "2023-09-05T20:44:54Z")

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I use satellite data from a few sources (NASA- Landsat, etc., ESA - Sentinel1/2, etc.), and I know that there are a few ways to handle this in Julia (like GeoArrays.jl ArchGDAL.jl). But are there any thoughts to developi…

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## [Blog Post: Tight link between code and math, while keeping speed](https://discourse.julialang.org/t/blog-post-tight-link-between-code-and-math-while-keeping-speed/103548)

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**Author:** [@alfaromartino](https://discourse.julialang.org/u/alfaromartino)\
**Replies:** 0\
**Last updated:** [September 5, 2023, 4:43pm UTC](https://discourse.julialang.org/t/blog-post-tight-link-between-code-and-math-while-keeping-speed/103548 "2023-09-05T16:43:24Z")

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I wrote a blog post about how Julia makes it possible to maintain a tight connection between the code and the written equations of a model, without sacrificing speed. The goal was to demonstrate an approach I use to str…

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## [Mixed NN and functions fail with NeuralPDE](https://discourse.julialang.org/t/mixed-nn-and-functions-fail-with-neuralpde/103447)

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**Author:** [@Knud\_Sorensen](https://discourse.julialang.org/u/Knud_Sorensen)\
**Replies:** 7\
**Last updated:** [September 5, 2023, 3:13pm UTC](https://discourse.julialang.org/t/mixed-nn-and-functions-fail-with-neuralpde/103447 "2023-09-05T15:13:04Z")

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Hi. I’m trying to use NeuralPDE to approximate a solution to a PDE containing both Neural nets and functions. Something goes wrong, can you help ? I am new to NeuralPDE, so it might just be a newbie error. Here is the …

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## [Any examples applying Physics Informed Neural Networks to ODEs?](https://discourse.julialang.org/t/any-examples-applying-physics-informed-neural-networks-to-odes/103512)

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**Author:** [@affans](https://discourse.julialang.org/u/affans)\
**Replies:** 1\
**Last updated:** [September 5, 2023, 2:04pm UTC](https://discourse.julialang.org/t/any-examples-applying-physics-informed-neural-networks-to-odes/103512 "2023-09-05T14:04:25Z")

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I recently have been involved in PINNs and their applications. While I understand the mathematics of NNs, ODE solvers, PDEs, etc… I have very little experience in implementing them and in Julia especially. Does anyone ha…

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## [Creating Variables from a Vector of Tuples and Naming Them](https://discourse.julialang.org/t/creating-variables-from-a-vector-of-tuples-and-naming-them/103525)

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**Author:** [@nemoincognito](https://discourse.julialang.org/u/nemoincognito)\
**Replies:** 8\
**Last updated:** [September 5, 2023, 3:22am UTC](https://discourse.julialang.org/t/creating-variables-from-a-vector-of-tuples-and-naming-them/103525 "2023-09-05T03:22:00Z")

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I have converted some PuLP code to Julia and have three vectors of Tuples. supplylist: 149988-element Vector{Tuple{String15, String31}} flowslist: 499572-element Vector{Tuple{String15, String15, String31}} edgelist: …

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## [How to put text on a Gantt chart (Vega-Lite)?](https://discourse.julialang.org/t/how-to-put-text-on-a-gantt-chart-vega-lite/103515)

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**Author:** [@Josa9321](https://discourse.julialang.org/u/Josa9321)\
**Replies:** 1\
**Last updated:** [September 4, 2023, 5:36pm UTC](https://discourse.julialang.org/t/how-to-put-text-on-a-gantt-chart-vega-lite/103515 "2023-09-04T17:36:39Z")

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Hi, This plot using Vega-Lite for Gantt charts is almost perfect for me, but I want the text of the task on the plot. Here is my code with the image generated. using DataFrames, VegaLite # Create a DataFrame df = Data…

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## [Grouping plots to be able to overwrite them with new data](https://discourse.julialang.org/t/grouping-plots-to-be-able-to-overwrite-them-with-new-data/103397)

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**Author:** [@peremato](https://discourse.julialang.org/u/peremato)\
**Replies:** 3\
**Last updated:** [September 4, 2023, 4:16pm UTC](https://discourse.julialang.org/t/grouping-plots-to-be-able-to-overwrite-them-with-new-data/103397 "2023-09-04T16:16:18Z")

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When visualising 3D data I would like to keep some geometrical structures fixed (plotted with a series of functions mesh!), while to be able to overwrite a set of plots made with lines!, text!, etc. with new data. Is it…

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## [PlotlyJS question: How to change color of stacked bar](https://discourse.julialang.org/t/plotlyjs-question-how-to-change-color-of-stacked-bar/103495)

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**Author:** [@nnguyengiatan](https://discourse.julialang.org/u/nnguyengiatan)\
**Replies:** 2\
**Last updated:** [September 4, 2023, 8:08am UTC](https://discourse.julialang.org/t/plotlyjs-question-how-to-change-color-of-stacked-bar/103495 "2023-09-04T08:08:05Z")

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Hi all, I am using PlotlyJS.jl and trying to change color of stacked bar chart. p\_turnover\_s = plot( turnover\_size\_df, x=:year, y=:mean\_turnover, color=:size, text=:mean\_t…

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## [Stream large file via HTTP](https://discourse.julialang.org/t/stream-large-file-via-http/103486)

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**Author:** [@sschmidhuber](https://discourse.julialang.org/u/sschmidhuber)\
**Replies:** 0\
**Last updated:** [September 3, 2023, 4:45pm UTC](https://discourse.julialang.org/t/stream-large-file-via-http/103486 "2023-09-03T16:45:57Z")

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Hello all, my goal is to stream a large file via a HTTP GET request to a client. The file is potentially larger than my server’s memory. Related to that, I found the following on Stack Overflow: stream - Send a large fi…

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## [Symbolics.jl expressions that don't reduce to single type](https://discourse.julialang.org/t/symbolics-jl-expressions-that-dont-reduce-to-single-type/102551)

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**Author:** [@Eemilp](https://discourse.julialang.org/u/Eemilp)\
**Replies:** 5\
**Last updated:** [September 3, 2023, 4:27pm UTC](https://discourse.julialang.org/t/symbolics-jl-expressions-that-dont-reduce-to-single-type/102551 "2023-09-03T16:27:33Z")

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Hi, I’m trying to use Symbolics.jl to simplify some expressions in the domain of quantum mechanics. The problem I’m facing is that I would like to simplify a partial expression that does not exactly reduce to a single t…

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## [@Maintainer of Julia Graphics](https://discourse.julialang.org/t/maintainer-of-julia-graphics/103246)

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**Author:** [@ShalokShalom](https://discourse.julialang.org/u/ShalokShalom)\
**Replies:** 16\
**Last updated:** [September 3, 2023, 10:55am UTC](https://discourse.julialang.org/t/maintainer-of-julia-graphics/103246 "2023-09-03T10:55:34Z")

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Can anybody from the Julia Graphics team transition the QML binding, please: Do we know, who has admin rights, and can we ping them? Thanks

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## [How Preconditioners work for multiple eigenpairs](https://discourse.julialang.org/t/how-preconditioners-work-for-multiple-eigenpairs/103456)

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**Author:** [@Neo](https://discourse.julialang.org/u/Neo)\
**Replies:** 4\
**Last updated:** [September 3, 2023, 6:16am UTC](https://discourse.julialang.org/t/how-preconditioners-work-for-multiple-eigenpairs/103456 "2023-09-03T06:16:25Z")

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I am using Preconditioners.jl to precondition the eigensolver lobpcg in IterativeSolvers.jl. But the preconditioners didn’t worked for more than one vectors. Any ideas? This works when I need only one eigenpair. using …

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## [Error with ODE Tableaus by DiffEqDevTools](https://discourse.julialang.org/t/error-with-ode-tableaus-by-diffeqdevtools/103448)

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**Author:** [@simon79](https://discourse.julialang.org/u/simon79)\
**Replies:** 5\
**Last updated:** [September 2, 2023, 10:46pm UTC](https://discourse.julialang.org/t/error-with-ode-tableaus-by-diffeqdevtools/103448 "2023-09-02T22:46:16Z")

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I am having errors with the tableau methods for explicitRK using DiffEqDevTools listed in tableau-methods-list The code using DiffEqBase using DiffEqDevTools using OrdinaryDiffEq using ODEInterfaceDiffEq using SciMLB…

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## [Issue of volume render with large 3D data](https://discourse.julialang.org/t/issue-of-volume-render-with-large-3d-data/103395)

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**Author:** [@dora\_ho](https://discourse.julialang.org/u/dora_ho)\
**Replies:** 3\
**Last updated:** [September 2, 2023, 6:26pm UTC](https://discourse.julialang.org/t/issue-of-volume-render-with-large-3d-data/103395 "2023-09-02T18:26:53Z")

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Hi, I was trying to volume render a very large 3D data withGLMakie. However, I found this exists a limit for the volume render. This is my plotting scripts GLMakie.volume!(x, y, z, 3DArray, algorithm=:mip , absorpt…

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## [GLMakie: Run a function when slider is released](https://discourse.julialang.org/t/glmakie-run-a-function-when-slider-is-released/103295)

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**Author:** [@f.ij](https://discourse.julialang.org/u/f.ij)\
**Replies:** 3\
**Last updated:** [September 2, 2023, 2:46pm UTC](https://discourse.julialang.org/t/glmakie-run-a-function-when-slider-is-released/103295 "2023-09-02T14:46:06Z")

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Quite a simple question: Is it possible to run a function specifically when a slider is released? A way to check whether the slider is currently being dragged would suffice. I couldn’t find a way to do this.

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## [Slow MCMC sampling of complex polynomial model \[Turing.jl\]](https://discourse.julialang.org/t/slow-mcmc-sampling-of-complex-polynomial-model-turing-jl/102184)

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**Author:** [@rubisco](https://discourse.julialang.org/u/rubisco)\
**Replies:** 2\
**Last updated:** [September 2, 2023, 10:25am UTC](https://discourse.julialang.org/t/slow-mcmc-sampling-of-complex-polynomial-model-turing-jl/102184 "2023-09-02T10:25:25Z")

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In my model functions I use several complicated functions (long equations for Q and cd functions with many terms). Basically \[look in Q\_generated function\] they are some polynomials of v and w parameter - where v is scal…

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## [Help with understanding Turing's predict function](https://discourse.julialang.org/t/help-with-understanding-turings-predict-function/102021)

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**Author:** [@JanG](https://discourse.julialang.org/u/JanG)\
**Replies:** 3\
**Last updated:** [September 2, 2023, 9:42am UTC](https://discourse.julialang.org/t/help-with-understanding-turings-predict-function/102021 "2023-09-02T09:42:28Z")

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Hi everybody, I played around a bit with the predict() function in Turing and encountered some behaviour I don’t quite understand. When I use it to produce new output based on a chain, it only seems to take some of the …

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## [Within-chain parallelization with Turing.jl](https://discourse.julialang.org/t/within-chain-parallelization-with-turing-jl/103402)

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**Author:** [@Nicolo\_Foppa](https://discourse.julialang.org/u/Nicolo_Foppa)\
**Replies:** 6\
**Last updated:** [September 1, 2023, 9:56pm UTC](https://discourse.julialang.org/t/within-chain-parallelization-with-turing-jl/103402 "2023-09-01T21:56:54Z")

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Hi everyone, I’m a new Turing user and I read that there is a possible way to parallelize the MCMC of a single chain on multiple threads but I’m not able to do that. Do you have any references that I can use to have a b…

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## [Error running Museinference.jl example](https://discourse.julialang.org/t/error-running-museinference-jl-example/103360)

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**Author:** [@mgp](https://discourse.julialang.org/u/mgp)\
**Replies:** 7\
**Last updated:** [September 1, 2023, 6:58pm UTC](https://discourse.julialang.org/t/error-running-museinference-jl-example/103360 "2023-09-01T18:58:53Z")

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Not sure if this should be a new topic. It follows on from https://discourse.julialang.org/t/ann-museinference-jl-drop-in-replacement-for-hmc-vi-try-it-on-your-problem/73468. When I run the example code @model function…

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## [Does a Sequential Modular Approach (SMA) algorithm exist for solving component-based systems of non-linear equations](https://discourse.julialang.org/t/does-a-sequential-modular-approach-sma-algorithm-exist-for-solving-component-based-systems-of-non-linear-equations/103389)

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**Author:** [@chris-hampel-CA](https://discourse.julialang.org/u/chris-hampel-CA)\
**Replies:** 2\
**Last updated:** [September 1, 2023, 5:41pm UTC](https://discourse.julialang.org/t/does-a-sequential-modular-approach-sma-algorithm-exist-for-solving-component-based-systems-of-non-linear-equations/103389 "2023-09-01T17:41:17Z")

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Hello, I am polling this board to see if anyone knows if an algorithm exists in any Julia package to perform the Sequential Modular Approach (SMA) technique for solving systems of connected components where each compone…

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## [Numerical solutions of eigenvalue problems with linear constrains](https://discourse.julialang.org/t/numerical-solutions-of-eigenvalue-problems-with-linear-constrains/103325)

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**Author:** [@swish47](https://discourse.julialang.org/u/swish47)\
**Replies:** 6\
**Last updated:** [September 1, 2023, 2:34pm UTC](https://discourse.julialang.org/t/numerical-solutions-of-eigenvalue-problems-with-linear-constrains/103325 "2023-09-01T14:34:35Z")

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As an example, one need to search the least or the least second eigenvalue and corresponded eigenvector of matrix A, under constraint Bx=c, where B is coefficient matrix, x is eigenvector under search, and c is a constan…

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