# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=346

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**Page:** 347

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## [AssertionError GCNConv FeaturedGraph GeometricFlux](https://discourse.julialang.org/t/assertionerror-gcnconv-featuredgraph-geometricflux/66061)

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**Author:** [@riegel\_gestr](https://discourse.julialang.org/u/riegel_gestr)\
**Replies:** 1\
**Last updated:** [August 13, 2021, 7:09am UTC](https://discourse.julialang.org/t/assertionerror-gcnconv-featuredgraph-geometricflux/66061 "2021-08-13T07:09:24Z")

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I am trying the GeometricFlux library by doing some test (coming from torch\_geometric). So test that I am doing is a simple graphs classification and I have considered very simple input: N = 100 k = 10 g = erdos\_renyi(…

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## [Manning liveProject on data science with Julia](https://discourse.julialang.org/t/manning-liveproject-on-data-science-with-julia/65692)

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**Author:** [@bkamins](https://discourse.julialang.org/u/bkamins)\
**Replies:** 5\
**Last updated:** [August 13, 2021, 6:04am UTC](https://discourse.julialang.org/t/manning-liveproject-on-data-science-with-julia/65692 "2021-08-13T06:04:52Z")

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I am soon releasing a liveProject with Manning on doing data science with Julia. You can find the link to it here. The liveProject is - as its name says - project oriented, so expect it to be challenging for someone jus…

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## [Loading touchstone (.snp) files](https://discourse.julialang.org/t/loading-touchstone-snp-files/66012)

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**Author:** [@Valery](https://discourse.julialang.org/u/Valery)\
**Replies:** 8\
**Last updated:** [August 13, 2021, 4:03am UTC](https://discourse.julialang.org/t/loading-touchstone-snp-files/66012 "2021-08-13T04:03:08Z")

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At the moment, what is the most convenient way to load touchstone (.snp) files in Julia ? I typically want to load scattering parameter of a multi-channel array extracted from software like Advanced Software Design (ADS…

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## [Recent AI developments: Roformer (transformer w/Rotary Position Embedding) and DL to Rejuvenate Symbolic AI: Neural Production](https://discourse.julialang.org/t/recent-ai-developments-roformer-transformer-w-rotary-position-embedding-and-dl-to-rejuvenate-symbolic-ai-neural-production/66314)

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**Author:** [@Palli](https://discourse.julialang.org/u/Palli)\
**Replies:** 4\
**Last updated:** [August 13, 2021, 12:56am UTC](https://discourse.julialang.org/t/recent-ai-developments-roformer-transformer-w-rotary-position-embedding-and-dl-to-rejuvenate-symbolic-ai-neural-production/66314 "2021-08-13T00:56:08Z")

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A. Seems important: ROFORMER: ENHANCED TRANSFORMER WITH ROTARY POSITION EMBEDDING We investigate various methods to encode positional information in transformer-based language models and propose a novel implementati…

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## [FeaturedGraph Explanation](https://discourse.julialang.org/t/featuredgraph-explanation/66294)

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**Author:** [@NFSturm](https://discourse.julialang.org/u/NFSturm)\
**Replies:** 0\
**Last updated:** [August 12, 2021, 8:33pm UTC](https://discourse.julialang.org/t/featuredgraph-explanation/66294 "2021-08-12T20:33:34Z")

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Dear Julia Community, I was recently becoming interested in Machine Learning on graphs I found the GeometricFlux library that seems to be quite useful in that regard. My understanding of graphs in general is rather basi…

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## [Landau distribution or something similar](https://discourse.julialang.org/t/landau-distribution-or-something-similar/66063)

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**Author:** [@tamasgal](https://discourse.julialang.org/u/tamasgal)\
**Replies:** 23\
**Last updated:** [August 12, 2021, 4:45pm UTC](https://discourse.julialang.org/t/landau-distribution-or-something-similar/66063 "2021-08-12T16:45:46Z")

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Good day everyone! I need a tiny toss in the right direction since I am stuck with some statistics problems. I am investigating signals which are similar to a Landau distribution but I don’t have a good physical model …

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## [Plot using for loop](https://discourse.julialang.org/t/plot-using-for-loop/66167)

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**Author:** [@Phonindra](https://discourse.julialang.org/u/Phonindra)\
**Replies:** 10\
**Last updated:** [August 12, 2021, 4:22pm UTC](https://discourse.julialang.org/t/plot-using-for-loop/66167 "2021-08-12T16:22:11Z")

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I have ode like this Now if I need the result for a series of different values of the parameter “p”, I was trying to use for loop to do that, here is the code Which shows the following error! Please help me t…

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## [Equating two symbolically symmetric matrices in JuMP without redundant constraints](https://discourse.julialang.org/t/equating-two-symbolically-symmetric-matrices-in-jump-without-redundant-constraints/66274)

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**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 2\
**Last updated:** [August 12, 2021, 3:14pm UTC](https://discourse.julialang.org/t/equating-two-symbolically-symmetric-matrices-in-jump-without-redundant-constraints/66274 "2021-08-12T15:14:06Z")

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Dear All, I am trying to define a constraint to equate two symbolically symmetric matrices and I am wondering if there is a compact way so that JuMP does not store redundant constraints. A simple example is as follows u…

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## [Chebyshev Coefficients for 1/(1+x^2); interpretation of equations in paper](https://discourse.julialang.org/t/chebyshev-coefficients-for-1-1-x-2-interpretation-of-equations-in-paper/66001)

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**Author:** [@blackeneth](https://discourse.julialang.org/u/blackeneth)\
**Replies:** 6\
**Last updated:** [August 12, 2021, 2:04pm UTC](https://discourse.julialang.org/t/chebyshev-coefficients-for-1-1-x-2-interpretation-of-equations-in-paper/66001 "2021-08-12T14:04:40Z")

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I need to calculate C2k from the paper, Modification of of Owen’s Method for Computing the Bivariate Normal Integral (DM Borth, 1973). The relevant bit of math is here: Note the sentence, Letting\\ C\_{2k} \\ be\\ the…

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## [Dash.jl slider doesn't display labels](https://discourse.julialang.org/t/dash-jl-slider-doesnt-display-labels/66253)

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**Author:** [@Iulian.Cioarca](https://discourse.julialang.org/u/Iulian.Cioarca)\
**Replies:** 1\
**Last updated:** [August 12, 2021, 11:16am UTC](https://discourse.julialang.org/t/dash-jl-slider-doesnt-display-labels/66253 "2021-08-12T11:16:24Z")

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I was messing around with dcc\_slider and observed that labels are missing if the marks argument is constructed using an array of Floats, with zero as decimal (ex: 0.0:10.0). The labels are displayed fine if I use either …

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## [Query optimizer support for indicator constraints](https://discourse.julialang.org/t/query-optimizer-support-for-indicator-constraints/66244)

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**Author:** [@SupplyChef](https://discourse.julialang.org/u/SupplyChef)\
**Replies:** 1\
**Last updated:** [August 12, 2021, 3:39am UTC](https://discourse.julialang.org/t/query-optimizer-support-for-indicator-constraints/66244 "2021-08-12T03:39:30Z")

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Hello, Is there a way to query if a solver supports indicator constraints? I’d like to write a function that produces a model that uses indicator constraints if they are supported and reverts to a big-M constraints if n…

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## [Arrow.jl reading compressed(lz4 and zstd) arrow/feather format may have memory leak](https://discourse.julialang.org/t/arrow-jl-reading-compressed-lz4-and-zstd-arrow-feather-format-may-have-memory-leak/52177)

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**Author:** [@jesseventura](https://discourse.julialang.org/u/jesseventura)\
**Replies:** 3\
**Last updated:** [August 12, 2021, 1:47am UTC](https://discourse.julialang.org/t/arrow-jl-reading-compressed-lz4-and-zstd-arrow-feather-format-may-have-memory-leak/52177 "2021-08-12T01:47:19Z")

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refer to memory leaking when reading compressed arrow files · Issue #80 · apache/arrow-julia · GitHub I found only when i have a compressed arrow format(lz4 or zstd) , the memory leak problem occurs. uncompressed forma…

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## [Creating an array of symmetric matrix variables in \`JuMP\`](https://discourse.julialang.org/t/creating-an-array-of-symmetric-matrix-variables-in-jump/66229)

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**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 2\
**Last updated:** [August 11, 2021, 9:13pm UTC](https://discourse.julialang.org/t/creating-an-array-of-symmetric-matrix-variables-in-jump/66229 "2021-08-11T21:13:23Z")

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Dear All, I am trying to create an array of symmetric matrix variables in JuMP, i.e., an array of matrix variables X\_i\\in\\mathbf{S}^n for i\\in\\{1,2,\\ldots,N\\}. If I had only one symmetric matrix variable X\\in\\mathbf{S}^…

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## [Get training data from saved machine](https://discourse.julialang.org/t/get-training-data-from-saved-machine/66114)

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**Author:** [@Vishal\_Sharma1](https://discourse.julialang.org/u/Vishal_Sharma1)\
**Replies:** 1\
**Last updated:** [August 11, 2021, 9:13pm UTC](https://discourse.julialang.org/t/get-training-data-from-saved-machine/66114 "2021-08-11T21:13:08Z")

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Using MLJ, after saving and retrieving a machine - Is there any method to retrieve the training data that was used to train this machine. I am unable to find any such method in documentation.

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## [Julia v1.7.0-beta3 installs old Turing version](https://discourse.julialang.org/t/julia-v1-7-0-beta3-installs-old-turing-version/66185)

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**Author:** [@stst](https://discourse.julialang.org/u/stst)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 4:53pm UTC](https://discourse.julialang.org/t/julia-v1-7-0-beta3-installs-old-turing-version/66185 "2021-08-11T16:53:57Z")

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\] add Turing in the REPL of a fresh Julia v1.7.0-beta3 install on Windows with an emtpy .julia folder installs Turing v0.15.1 instead of the most recent v0.17.0. \] add Turing@v0.17.0 results in an unsatisfiable requirem…

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## [Automatic differentiation of \`cispi\`](https://discourse.julialang.org/t/automatic-differentiation-of-cispi/66075)

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**Author:** [@RainerHeintzmann](https://discourse.julialang.org/u/RainerHeintzmann)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 3:43pm UTC](https://discourse.julialang.org/t/automatic-differentiation-of-cispi/66075 "2021-08-11T15:43:20Z")

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I think the rrule for cispi seems to be missing. Maybe it should be included in the basic set of rules? function loss2(data) sum(abs.(cispi.(data))) end data = ones(2,2) loss2(data) gradient(loss2, data) yields: j…

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## [Inconsitency in matrix multiplication](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193)

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**Author:** [@Joseph\_S\_Rebeirro](https://discourse.julialang.org/u/Joseph_S_Rebeirro)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 12:40pm UTC](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193 "2021-08-11T12:40:27Z")

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Hi All, I was playing with the Quantum optics package and I saw something weird So the resulting matrix is inconsistent in comparison with other CAS systems (Mathematica) Mathematica: # Spin operators Sx = 1/Sq…

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## [Solving inequations](https://discourse.julialang.org/t/solving-inequations/58410)

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**Author:** [@statspy](https://discourse.julialang.org/u/statspy)\
**Replies:** 8\
**Last updated:** [August 11, 2021, 9:42am UTC](https://discourse.julialang.org/t/solving-inequations/58410 "2021-08-11T09:42:20Z")

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is there a package to solve inequations in Julia? 2x + 3 \<= x + 7 answer: x\<= 4 Thanks

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## [How to make R, C, etc. parameters in Acausal Component-Based Model (ModelingToolkit example)](https://discourse.julialang.org/t/how-to-make-r-c-etc-parameters-in-acausal-component-based-model-modelingtoolkit-example/66115)

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**Author:** [@TS-CUBED](https://discourse.julialang.org/u/TS-CUBED)\
**Replies:** 6\
**Last updated:** [August 11, 2021, 9:04am UTC](https://discourse.julialang.org/t/how-to-make-r-c-etc-parameters-in-acausal-component-based-model-modelingtoolkit-example/66115 "2021-08-11T09:04:39Z")

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Hello, I am trying to move my models to the new ModelingToolkit framework and so far everything works nicely and it creates the models nicely. For simplicity I refer here to the example as outlined in Acausal Component…

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## [Laplace approximation for mixed models in Julia (TMB-like functionality)](https://discourse.julialang.org/t/laplace-approximation-for-mixed-models-in-julia-tmb-like-functionality/61796)

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**Author:** [@monnahc](https://discourse.julialang.org/u/monnahc)\
**Replies:** 35\
**Last updated:** [August 10, 2021, 10:26pm UTC](https://discourse.julialang.org/t/laplace-approximation-for-mixed-models-in-julia-tmb-like-functionality/61796 "2021-08-10T22:26:53Z")

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Hello, \[Apologies for lack of URLs, I’m a new user so limited to only 2. I can provide more in a follow up as requested\] I’m writing to inquire about the current state of Julia with respect to the Laplace approximation…

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## [GSP Package](https://discourse.julialang.org/t/gsp-package/66132)

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**Author:** [@elefthca](https://discourse.julialang.org/u/elefthca)\
**Replies:** 2\
**Last updated:** [August 10, 2021, 8:40pm UTC](https://discourse.julialang.org/t/gsp-package/66132 "2021-08-10T20:40:48Z")

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Hello everyone! I recently became interested in Graph Signal Processing and upon searching, I found nothing relevant implemented in Julia. I also saw that the call for NumFocus grants opened just a couple of days ago wh…

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## [Tips on writing kernels?](https://discourse.julialang.org/t/tips-on-writing-kernels/66074)

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**Author:** [@Ribeiro](https://discourse.julialang.org/u/Ribeiro)\
**Replies:** 4\
**Last updated:** [August 10, 2021, 8:40pm UTC](https://discourse.julialang.org/t/tips-on-writing-kernels/66074 "2021-08-10T20:40:45Z")

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Hello! I’m working on a problem where I have structs with big vectors and I have to compute stuff index vs index (N square). Something like this: for i in 1:length(bigVector1) for j in 1:length(bigVector2) bigVe…

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## [Ridgelets, Shapelets, Curvelets, Radon Transform etc?](https://discourse.julialang.org/t/ridgelets-shapelets-curvelets-radon-transform-etc/45042)

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**Author:** [@anon92994695](https://discourse.julialang.org/u/anon92994695)\
**Replies:** 1\
**Last updated:** [August 10, 2021, 3:48pm UTC](https://discourse.julialang.org/t/ridgelets-shapelets-curvelets-radon-transform-etc/45042 "2021-08-10T15:48:22Z")

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Anyone know of efforts in Julia to do these fancy \*-let type DSP operations? I was able to find one repository(https://github.com/NFFT/nfft), but it’s a C effort with only a partial Julia interface(it seems)? Whoever i…

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## [NeuralODE: optimal control action in a constrained optimization problem](https://discourse.julialang.org/t/neuralode-optimal-control-action-in-a-constrained-optimization-problem/63372)

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**Author:** [@Antonino\_Gandolfo](https://discourse.julialang.org/u/Antonino_Gandolfo)\
**Replies:** 13\
**Last updated:** [July 26, 2021, 5:03pm UTC](https://discourse.julialang.org/t/neuralode-optimal-control-action-in-a-constrained-optimization-problem/63372 "2021-07-26T17:03:01Z")

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Hi, I’m new with Julia. I want to ask if it’s possible to optimize an differential equation using the NeuralODE. I try to create my code but the problems are the physical constrains. I don’t know how to add this equa…

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## [Mixing GPU/CPU in struct definition](https://discourse.julialang.org/t/mixing-gpu-cpu-in-struct-definition/66066)

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**Author:** [@Ribeiro](https://discourse.julialang.org/u/Ribeiro)\
**Replies:** 5\
**Last updated:** [August 10, 2021, 9:37am UTC](https://discourse.julialang.org/t/mixing-gpu-cpu-in-struct-definition/66066 "2021-08-10T09:37:23Z")

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Hello, I use big structs in my code with lots of different vectors of integers and floats like so: mutable struct Bodies a:: Vector{StaticArrays.SVector{3,Float64}} b:: Int c:: Vector{StaticArrays.SVector{3…

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## [Regular JuMP-NLP developer call](https://discourse.julialang.org/t/regular-jump-nlp-developer-call/65797)

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**Author:** [@frapac](https://discourse.julialang.org/u/frapac)\
**Replies:** 1\
**Last updated:** [August 10, 2021, 7:37am UTC](https://discourse.julialang.org/t/regular-jump-nlp-developer-call/65797 "2021-08-10T07:37:13Z")

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Hi everyone! Last week at JuMP-dev, we agreed on organizing a regular meeting to discuss the future of nonlinear programming in Julia/JuMP. As a follow-up, I would suggest to organize our first meeting by the end of Au…

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## [LoadError: UndefVarError: @defVar not defined](https://discourse.julialang.org/t/loaderror-undefvarerror-defvar-not-defined/66022)

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**Author:** [@zhangsanle](https://discourse.julialang.org/u/zhangsanle)\
**Replies:** 4\
**Last updated:** [August 9, 2021, 10:50am UTC](https://discourse.julialang.org/t/loaderror-undefvarerror-defvar-not-defined/66022 "2021-08-09T10:50:21Z")

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I have a piece of code about JuMP. When I run it ,it says that LoadError: UndefVarError: @defVar not defined. I have tried using global forward or backward but both fails. See: function T1(w\_func,grid\_b,β,u,z) …

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## [Multiple GPUs with Julia](https://discourse.julialang.org/t/multiple-gpus-with-julia/11248)

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**Author:** [@jacobcvt12](https://discourse.julialang.org/u/jacobcvt12)\
**Replies:** 8\
**Last updated:** [August 9, 2021, 9:49am UTC](https://discourse.julialang.org/t/multiple-gpus-with-julia/11248 "2021-08-09T09:49:25Z")

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Has anyone every used multiple GPUs with Flux? If so, did you have to modify your code to run on multiple GPUs?

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## [Getting Started with High Frequency Finance using Crypto Data and Julia](https://discourse.julialang.org/t/getting-started-with-high-frequency-finance-using-crypto-data-and-julia/63730)

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**Author:** [@dm13450](https://discourse.julialang.org/u/dm13450)\
**Replies:** 11\
**Last updated:** [August 9, 2021, 12:03am UTC](https://discourse.julialang.org/t/getting-started-with-high-frequency-finance-using-crypto-data-and-julia/63730 "2021-08-09T00:03:08Z")

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I’ve written about how to use my CoinbasePro.jl package in Julia to get started with some concepts in high frequency finance. Happy to answer any questions around the subject for anyone interested!

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## [Q: The scope for development of a flexible framework for coupled stiff integro-differential equations](https://discourse.julialang.org/t/q-the-scope-for-development-of-a-flexible-framework-for-coupled-stiff-integro-differential-equations/65935)

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**Author:** [@SMijin](https://discourse.julialang.org/u/SMijin)\
**Replies:** 7\
**Last updated:** [August 8, 2021, 10:28pm UTC](https://discourse.julialang.org/t/q-the-scope-for-development-of-a-flexible-framework-for-coupled-stiff-integro-differential-equations/65935 "2021-08-08T22:28:27Z")

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Hello, New user here, quite eager to get involved with the community, so my apologies for the long post! I work in fusion research, and am interested in testing modelling approaches for systems of coupled stiff integro…

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