# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=313

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**Page:** 314

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## [How to integrate 3d-force-graph into Dash.jl?](https://discourse.julialang.org/t/how-to-integrate-3d-force-graph-into-dash-jl/73693)

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**Author:** [@Junars](https://discourse.julialang.org/u/Junars)\
**Replies:** 0\
**Last updated:** [December 28, 2021, 2:15am UTC](https://discourse.julialang.org/t/how-to-integrate-3d-force-graph-into-dash-jl/73693 "2021-12-28T02:15:33Z")

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I am planning to use Dash.jl to make a web ui, it’s a dashboard with a dynamic 3d graph network illustration, Dash.jl ecosystem already has DashCytoscape and DashVTK，but 3d-force-graph is more fantastic and seems easy to…

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## [Adding a few variables and constraints makes the model nearly unsolvable](https://discourse.julialang.org/t/adding-a-few-variables-and-constraints-makes-the-model-nearly-unsolvable/70401)

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**Author:** [@fksayaci](https://discourse.julialang.org/u/fksayaci)\
**Replies:** 11\
**Last updated:** [December 28, 2021, 1:52am UTC](https://discourse.julialang.org/t/adding-a-few-variables-and-constraints-makes-the-model-nearly-unsolvable/70401 "2021-12-28T01:52:40Z")

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Hi all, I know that this has nothing to do with Julia, but although I asked the following question in Gurobi community, I have not received a response yet. Could you please help me with the following issue? I have a po…

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## [\`groups\` argument in Flux.Conv : a misunderstanding](https://discourse.julialang.org/t/groups-argument-in-flux-conv-a-misunderstanding/73641)

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**Author:** [@sim](https://discourse.julialang.org/u/sim)\
**Replies:** 4\
**Last updated:** [December 27, 2021, 8:50am UTC](https://discourse.julialang.org/t/groups-argument-in-flux-conv-a-misunderstanding/73641 "2021-12-27T08:50:23Z")

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Hello, I want to define a convolutional layer in Flux.jl using the groups option. Ideally, I want to use Conv((1,1), 3=\>3, groups=3). For reference, the Flux.Conv documentation defines this argument as Keyword groups …

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## [Consistent way to suppress solver output](https://discourse.julialang.org/t/consistent-way-to-suppress-solver-output/20437)

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**Author:** [@ndinsmore](https://discourse.julialang.org/u/ndinsmore)\
**Replies:** 8\
**Last updated:** [December 26, 2021, 9:17pm UTC](https://discourse.julialang.org/t/consistent-way-to-suppress-solver-output/20437 "2021-12-26T21:17:56Z")

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Is there a consistent way to suppress the solver output in JuMP v0.19 or MOI? It isn’t clear to me if there is.

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## [What to do when the DEQ model does not converge？](https://discourse.julialang.org/t/what-to-do-when-the-deq-model-does-not-converge/73610)

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**Author:** [@chen2021](https://discourse.julialang.org/u/chen2021)\
**Replies:** 6\
**Last updated:** [December 26, 2021, 12:13pm UTC](https://discourse.julialang.org/t/what-to-do-when-the-deq-model-does-not-converge/73610 "2021-12-26T12:13:31Z")

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Hi everyone! I am learning Deep equilibrium (DEQ) models. The following code is copied from @ChrisRackauckas 's reply in a topic (sorry forgot which topic). Its purpose is to train a DEQ model to fit y=2x. using Flux us…

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## [Trouble with NeuralPDE with ADAM optimizer on GPU](https://discourse.julialang.org/t/trouble-with-neuralpde-with-adam-optimizer-on-gpu/73622)

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**Author:** [@vnikoofard](https://discourse.julialang.org/u/vnikoofard)\
**Replies:** 5\
**Last updated:** [December 26, 2021, 4:58am UTC](https://discourse.julialang.org/t/trouble-with-neuralpde-with-adam-optimizer-on-gpu/73622 "2021-12-26T04:58:06Z")

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I’m trying to solve the dynamics of a massive particle on gravitational force by PINNs. The below code is inspired by an example in the documentation of NeuralPDE package. The problem is that the ADAM optimizer runs smoo…

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## [Type Observable{Int64} isn't supported for uniform: dodge](https://discourse.julialang.org/t/type-observable-int64-isnt-supported-for-uniform-dodge/73635)

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**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 0\
**Last updated:** [December 26, 2021, 3:50am UTC](https://discourse.julialang.org/t/type-observable-int64-isnt-supported-for-uniform-dodge/73635 "2021-12-26T03:50:02Z")

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Why does this fail? using DataFrames, AlgebraOfGraphics, WGLMakie plotdf = DataFrame(a=\["x", "x", "y", "y"\], b=\["a", "b", "a", "b"\], c=\[1., 2., 3.,4.\]) spec = ( data(plotdf) \* mapping(:a, dodge=:b, color=:b) …

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## [How to define a data-dependent model without using global variables](https://discourse.julialang.org/t/how-to-define-a-data-dependent-model-without-using-global-variables/73584)

<div class="topic-metadata">

**Author:** [@chen2021](https://discourse.julialang.org/u/chen2021)\
**Replies:** 4\
**Last updated:** [December 25, 2021, 4:40am UTC](https://discourse.julialang.org/t/how-to-define-a-data-dependent-model-without-using-global-variables/73584 "2021-12-25T04:40:20Z")

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Hi, I am facing a problem that the network model depends on data. In fact, I am trying to train an iterator to solve $Au=f$，the model performs a single-step iteration u\_next = model(u), hence the model depends on A and f…

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## [Appending rows to a dataframe is seemingly inconsistent and confusing](https://discourse.julialang.org/t/appending-rows-to-a-dataframe-is-seemingly-inconsistent-and-confusing/73298)

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**Author:** [@JackStrauss](https://discourse.julialang.org/u/JackStrauss)\
**Replies:** 11\
**Last updated:** [December 24, 2021, 11:24pm UTC](https://discourse.julialang.org/t/appending-rows-to-a-dataframe-is-seemingly-inconsistent-and-confusing/73298 "2021-12-24T23:24:25Z")

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Hi Everybody Coming from python and R, I find Julia a breath of fresh air. Usually so much better. But, I find dataframes, and especially adding rows to dataframes is very confusing, and much harder than R or python. H…

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## [New: WildBootTests for wild-bootstrap-based inference on linear models](https://discourse.julialang.org/t/new-wildboottests-for-wild-bootstrap-based-inference-on-linear-models/73567)

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**Author:** [@droodman](https://discourse.julialang.org/u/droodman)\
**Replies:** 1\
**Last updated:** [December 24, 2021, 10:49pm UTC](https://discourse.julialang.org/t/new-wildboottests-for-wild-bootstrap-based-inference-on-linear-models/73567 "2021-12-24T22:49:38Z")

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WildBootTests.jl is a Julia translation of the Stata package boottest, which is the most developed program for performing inference on linear models using the wild bootstrap. So it is algorithmically mature, but not quit…

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## [SOLVED: Animations and "\_display has no backend"](https://discourse.julialang.org/t/solved-animations-and-display-has-no-backend/28024)

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**Author:** [@Brad\_Hines](https://discourse.julialang.org/u/Brad_Hines)\
**Replies:** 0\
**Last updated:** [August 27, 2019, 4:11am UTC](https://discourse.julialang.org/t/solved-animations-and-display-has-no-backend/28024 "2019-08-27T04:11:06Z")

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Recording this just in case it helps someone else in the future. I have a function that sometimes I use for animation, and sometimes just to pop up an image. It had been working great, then suddenly failed with “\_displ…

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## [Changing '"' char by '\`' in FunSQL and MySQL query](https://discourse.julialang.org/t/changing-char-by-in-funsql-and-mysql-query/73589)

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**Author:** [@cesarmarinhorj](https://discourse.julialang.org/u/cesarmarinhorj)\
**Replies:** 1\
**Last updated:** [December 24, 2021, 2:31pm UTC](https://discourse.julialang.org/t/changing-char-by-in-funsql-and-mysql-query/73589 "2021-12-24T14:31:26Z")

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I am testing FunSQL (is amazing!!!) examples are in SQLite, ok, going to MySQL. my simple query dont works, because of extras ‘"’ chars around field names. Ok, so made a function, that replace them, as: function chang…

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## [Modeling dynamic economic systems using ModelingToolkit (MTK)](https://discourse.julialang.org/t/modeling-dynamic-economic-systems-using-modelingtoolkit-mtk/72861)

<div class="topic-metadata">

**Author:** [@finmod](https://discourse.julialang.org/u/finmod)\
**Replies:** 14\
**Last updated:** [December 23, 2021, 9:38pm UTC](https://discourse.julialang.org/t/modeling-dynamic-economic-systems-using-modelingtoolkit-mtk/72861 "2021-12-23T21:38:56Z")

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I am seeking help in specifying a dynamic economic model in MTK. Although I have followed the evolution of MTK since its creation, I have difficulties with “function” as a function can be the whole model, a function of p…

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## [Cannot return Result in OMJulia](https://discourse.julialang.org/t/cannot-return-result-in-omjulia/73406)

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**Author:** [@Amro](https://discourse.julialang.org/u/Amro)\
**Replies:** 11\
**Last updated:** [December 23, 2021, 8:43pm UTC](https://discourse.julialang.org/t/cannot-return-result-in-omjulia/73406 "2021-12-23T20:43:39Z")

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@arun3688 arun3688 @JKRT RT @AnHeuermann AnHeuermann I am using OpenModelica and I am trying to read the output (i.e., s here). I tried several ways but could not succeed. Any idea to solve that? using OMJulia omc= O…

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## [Hessian Vector products in Flux with Zygote](https://discourse.julialang.org/t/hessian-vector-products-in-flux-with-zygote/40242)

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**Author:** [@DR59](https://discourse.julialang.org/u/DR59)\
**Replies:** 4\
**Last updated:** [December 22, 2021, 9:29pm UTC](https://discourse.julialang.org/t/hessian-vector-products-in-flux-with-zygote/40242 "2021-12-22T21:29:03Z")

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Hi, I’m trying to update some of my code that uses Flux models and HVPs. With Tracker as the backend (i.e. the old version of Flux), this was possible. I’m unsure how to implement similar functionality with Zygote. Any h…

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## [Zygote gradients with ensemble ODEs](https://discourse.julialang.org/t/zygote-gradients-with-ensemble-odes/65062)

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**Author:** [@PavanChaggar](https://discourse.julialang.org/u/PavanChaggar)\
**Replies:** 16\
**Last updated:** [December 22, 2021, 9:24pm UTC](https://discourse.julialang.org/t/zygote-gradients-with-ensemble-odes/65062 "2021-12-22T21:24:34Z")

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Hey, I’ve been doing some work on getting zygote gradients from ensemble problems. I tried extending the first example in the docs for local sensitivities but I’m getting an error that I’m not sure how to solve. I’m not…

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## [Using Makie for Allotaxonometry](https://discourse.julialang.org/t/using-makie-for-allotaxonometry/73453)

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**Author:** [@jstonge](https://discourse.julialang.org/u/jstonge)\
**Replies:** 3\
**Last updated:** [December 22, 2021, 5:01pm UTC](https://discourse.julialang.org/t/using-makie-for-allotaxonometry/73453 "2021-12-22T17:01:21Z")

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Hi, As part of a small project of mine, I want to replicate a figure in a paper using Makie (this paper and these figures). The idea of allotaxonometry plots is that you compare two systems that are zipf distributed (in…

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## [CSV.Rows usage & Tables.jl interface](https://discourse.julialang.org/t/csv-rows-usage-tables-jl-interface/72120)

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**Author:** [@benibilme](https://discourse.julialang.org/u/benibilme)\
**Replies:** 8\
**Last updated:** [December 22, 2021, 2:28pm UTC](https://discourse.julialang.org/t/csv-rows-usage-tables-jl-interface/72120 "2021-12-22T14:28:59Z")

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Hello, I am newbie in julia so please bare with me. I am trying to read a csv file which includes a fairly large taxi data about 124M lines. I would like to read line by line. According to documentation, I should be u…

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## [Reading a large JSON file make Julia crashing](https://discourse.julialang.org/t/reading-a-large-json-file-make-julia-crashing/73424)

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**Author:** [@tlorans](https://discourse.julialang.org/u/tlorans)\
**Replies:** 10\
**Last updated:** [December 22, 2021, 1:55pm UTC](https://discourse.julialang.org/t/reading-a-large-json-file-make-julia-crashing/73424 "2021-12-22T13:55:35Z")

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Hello everyone, I’m trying to read and select a subset of a large JSON file from here. The result is a Dataframe of few lines (1600+) according to the game selected. However, I cannot reuse my process as after a first r…

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## [EAGO.jl: LoadError: Invalid upper bound value NaN](https://discourse.julialang.org/t/eago-jl-loaderror-invalid-upper-bound-value-nan/73403)

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**Author:** [@mvsoom](https://discourse.julialang.org/u/mvsoom)\
**Replies:** 4\
**Last updated:** [December 22, 2021, 11:19am UTC](https://discourse.julialang.org/t/eago-jl-loaderror-invalid-upper-bound-value-nan/73403 "2021-12-22T11:19:12Z")

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I’ve been trying to solve the following nonlinear optimization program with EAGO.jl in order to find a global solution: using JuMP using EAGO model = Model(EAGO.Optimizer) n = 2 r = 0.15 @variable(model, 0 \<= e…

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## [Read multi .nc files along new dimension](https://discourse.julialang.org/t/read-multi-nc-files-along-new-dimension/70696)

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**Author:** [@Inna](https://discourse.julialang.org/u/Inna)\
**Replies:** 10\
**Last updated:** [December 22, 2021, 7:52am UTC](https://discourse.julialang.org/t/read-multi-nc-files-along-new-dimension/70696 "2021-12-22T07:52:37Z")

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Dear all, I have some netcdf files containg temperature and precipitation, with size 360 x 180. There isn’t inside the .nc file the dimension of time, but it is on the name of each file (2012.01.nc, 2012.02.nc, … ). I w…

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## [Error in resampling with Rasters.jl](https://discourse.julialang.org/t/error-in-resampling-with-rasters-jl/73261)

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**Author:** [@MJulia](https://discourse.julialang.org/u/MJulia)\
**Replies:** 6\
**Last updated:** [December 22, 2021, 2:01am UTC](https://discourse.julialang.org/t/error-in-resampling-with-rasters-jl/73261 "2021-12-22T02:01:02Z")

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I’m trying to resample a data of lambert\_azimuthal\_equal\_area projection to normal Lat/Lon coordinates by using Rasters.jl as following: using NCDatasets using ArchGDAL using DimendionalData using Rasters ds = Data…

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## [Gradient Origin Networks with Zygote/Flux?](https://discourse.julialang.org/t/gradient-origin-networks-with-zygote-flux/73421)

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**Author:** [@afishy](https://discourse.julialang.org/u/afishy)\
**Replies:** 1\
**Last updated:** [December 21, 2021, 10:35pm UTC](https://discourse.julialang.org/t/gradient-origin-networks-with-zygote-flux/73421 "2021-12-21T22:35:01Z")

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Hi! I’d like to train an autoencoder according to this paper. Briefly, it requires first taking a gradient step to get an estimate of the latent vector z, and then evaluating the output of the decoder using z. The differ…

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## [Any tools for making expressions composed functions from nested function calls?](https://discourse.julialang.org/t/any-tools-for-making-expressions-composed-functions-from-nested-function-calls/73446)

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**Author:** [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)\
**Replies:** 2\
**Last updated:** [December 21, 2021, 9:36pm UTC](https://discourse.julialang.org/t/any-tools-for-making-expressions-composed-functions-from-nested-function-calls/73446 "2021-12-21T21:36:45Z")

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In a macro, I’m trying to turn the expression f(g(x)) into (f ∘ g)(x). To make sure I’m not trying to re-invent the wheel, I figured I would ask here if anyone has written a macro which does this.

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## [Defining a lower triangular matrix as the decision variable in JuMP](https://discourse.julialang.org/t/defining-a-lower-triangular-matrix-as-the-decision-variable-in-jump/73372)

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**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 5\
**Last updated:** [December 21, 2021, 9:36pm UTC](https://discourse.julialang.org/t/defining-a-lower-triangular-matrix-as-the-decision-variable-in-jump/73372 "2021-12-21T21:36:35Z")

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Dear All, I am trying to define a decision variable L \\in \\mathbb{R}^{n\\times n} in JuMP, which is lower triangular. As of now, I am defining this matrix as follows. @variable(my\_model, L\_mat\[1:n, 1:n\]) # upper off-di…

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## [Plural macros (e.g. @variables) should return collection of the defined objects](https://discourse.julialang.org/t/plural-macros-e-g-variables-should-return-collection-of-the-defined-objects/73397)

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**Author:** [@MartinBonde](https://discourse.julialang.org/u/MartinBonde)\
**Replies:** 4\
**Last updated:** [December 21, 2021, 8:08pm UTC](https://discourse.julialang.org/t/plural-macros-e-g-variables-should-return-collection-of-the-defined-objects/73397 "2021-12-21T20:08:42Z")

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When working on a large model it is extremely useful to be able to manipulate large groups of variables or constraints. To avoid repeating long lists of variable names or equations, it would be very useful if the the ‘p…

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## [Local edge feature aggregation in GraphNeuralNetworks.jl](https://discourse.julialang.org/t/local-edge-feature-aggregation-in-graphneuralnetworks-jl/73271)

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**Author:** [@bad\_at\_math](https://discourse.julialang.org/u/bad_at_math)\
**Replies:** 2\
**Last updated:** [December 21, 2021, 2:10pm UTC](https://discourse.julialang.org/t/local-edge-feature-aggregation-in-graphneuralnetworks-jl/73271 "2021-12-21T14:10:05Z")

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I’m looking at a broad class of graph neural network update operations defined as follows: for each edge \`k\` connecting vertices \`s\` and \`r\` ē\_k = ϕ\_e(concat(v\_s, v\_r, e\_k)) for each node \`i\` v\_{i, e} = Pool({ē…

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## [Run Julia/Makie simulations in Blender](https://discourse.julialang.org/t/run-julia-makie-simulations-in-blender/72796)

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**Author:** [@Chimel](https://discourse.julialang.org/u/Chimel)\
**Replies:** 7\
**Last updated:** [December 20, 2021, 10:57pm UTC](https://discourse.julialang.org/t/run-julia-makie-simulations-in-blender/72796 "2021-12-20T22:57:41Z")

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Hello, Blender user here, new to Julia. I ran into a Tweet with a cool Protein simuation done with the BioMakie.jl Julia program, and wanted to know if it is possible to export the simulation data to use it in Blender;…

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## [Lazy constraints with callback in gurobi](https://discourse.julialang.org/t/lazy-constraints-with-callback-in-gurobi/73367)

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**Author:** [@ahmad88](https://discourse.julialang.org/u/ahmad88)\
**Replies:** 1\
**Last updated:** [December 20, 2021, 7:17pm UTC](https://discourse.julialang.org/t/lazy-constraints-with-callback-in-gurobi/73367 "2021-12-20T19:17:59Z")

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Hi I have a model and when of model’s constraints is corresponding to cycles in the graph, so I am trying to add these cycle constraints as lazy constraints within the callback, so in each iteration, I am solving the mo…

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## [Create plot with multiple colorgradients](https://discourse.julialang.org/t/create-plot-with-multiple-colorgradients/73383)

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**Author:** [@DrChainsaw](https://discourse.julialang.org/u/DrChainsaw)\
**Replies:** 8\
**Last updated:** [December 20, 2021, 7:11pm UTC](https://discourse.julialang.org/t/create-plot-with-multiple-colorgradients/73383 "2021-12-20T19:11:02Z")

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I’m trying to visualize some data where I want to see some kind of distribution a (small) set of per sample distributions. I doubt that the description makes much sense, but this MWE creates the type of figure I would l…

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