# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=350

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**Page:** 351

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## [Passing data to modeling toolkit from a frontend](https://discourse.julialang.org/t/passing-data-to-modeling-toolkit-from-a-frontend/65013)

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**Author:** [@juliascrub](https://discourse.julialang.org/u/juliascrub)\
**Replies:** 0\
**Last updated:** [July 21, 2021, 4:14am UTC](https://discourse.julialang.org/t/passing-data-to-modeling-toolkit-from-a-frontend/65013 "2021-07-21T04:14:25Z")

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I am working on a little frontend for my modeling toolkit based project. let’s say I have a model my\_model. It has 3 parameters a,b, and c. I can call string.(parameters(my\_model)) and get a list of the parameter names,…

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## [@expression v.s. @constraint (when to use what)](https://discourse.julialang.org/t/expression-v-s-constraint-when-to-use-what/65008)

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**Author:** [@SingingKim](https://discourse.julialang.org/u/SingingKim)\
**Replies:** 5\
**Last updated:** [July 21, 2021, 3:11am UTC](https://discourse.julialang.org/t/expression-v-s-constraint-when-to-use-what/65008 "2021-07-21T03:11:57Z")

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I’m pretty sure this question will be redundant, but I could not find an answer anywhere. My question is more like asking a style guide so that my code can avoid any unnecessary build/calculation time. Q1. My guess is b…

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## [What do you need from a distributed computation framework?](https://discourse.julialang.org/t/what-do-you-need-from-a-distributed-computation-framework/55676)

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**Author:** [@dfdx](https://discourse.julialang.org/u/dfdx)\
**Replies:** 1\
**Last updated:** [July 20, 2021, 11:30pm UTC](https://discourse.julialang.org/t/what-do-you-need-from-a-distributed-computation-framework/55676 "2021-07-20T23:30:26Z")

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Recently I was thinking about adding UDF support to Spark.jl - a Julia bindings for Apache Spark. UDFs is how you run custom functions on distributed datasets in Python and Scala nowadays. However, adding them to Julia t…

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## [Calling Julia from EMTDC/PSCAD or MATLAB code](https://discourse.julialang.org/t/calling-julia-from-emtdc-pscad-or-matlab-code/52417)

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**Author:** [@anchasatish](https://discourse.julialang.org/u/anchasatish)\
**Replies:** 5\
**Last updated:** [July 20, 2021, 9:52pm UTC](https://discourse.julialang.org/t/calling-julia-from-emtdc-pscad-or-matlab-code/52417 "2021-07-20T21:52:20Z")

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I would like to use Julia programming as a software in loop for my EMTDC/PSCAD or MATLAB simulation i.e., optimization problem solved in julia and output of this optimization solution is given to the Simulation platform …

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## [Non-linear expressions in optimization](https://discourse.julialang.org/t/non-linear-expressions-in-optimization/64969)

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**Author:** [@Daniel\_Villamar](https://discourse.julialang.org/u/Daniel_Villamar)\
**Replies:** 5\
**Last updated:** [July 20, 2021, 4:33pm UTC](https://discourse.julialang.org/t/non-linear-expressions-in-optimization/64969 "2021-07-20T16:33:51Z")

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Hi! I use the version JuMP v0.21.4 and Julia v1.4.2 and I optimizing with Ipopt I ve been working in a non-linear optimization model. Sorry for not presenting a MWE but my code is full of things. I have a problems wit…

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## [PDE heat equation](https://discourse.julialang.org/t/pde-heat-equation/64428)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 24\
**Last updated:** [July 20, 2021, 3:15pm UTC](https://discourse.julialang.org/t/pde-heat-equation/64428 "2021-07-20T15:15:00Z")

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i want to solve the matrix ,but i can’t do it. i am new to Julia. please help me in finding error .i have to plot the last equation given in picture below. what is MethodError i am making?

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## [Empty container reduce error: diff eq](https://discourse.julialang.org/t/empty-container-reduce-error-diff-eq/64956)

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**Author:** [@graham](https://discourse.julialang.org/u/graham)\
**Replies:** 10\
**Last updated:** [July 20, 2021, 2:52pm UTC](https://discourse.julialang.org/t/empty-container-reduce-error-diff-eq/64956 "2021-07-20T14:52:17Z")

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Hi all, I’m trying to use the DifferentialEquations.jl package to perform explicit integration of a mass-spring-damper system. Here are the function I’m solving, and how I passed it into the SecondOrderODEProblem() fun…

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## [Performance issues JuMP, GLPK](https://discourse.julialang.org/t/performance-issues-jump-glpk/64971)

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**Author:** [@Annette\_F](https://discourse.julialang.org/u/Annette_F)\
**Replies:** 4\
**Last updated:** [July 20, 2021, 1:20pm UTC](https://discourse.julialang.org/t/performance-issues-jump-glpk/64971 "2021-07-20T13:20:12Z")

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Goodmorning, I have created the following MIP which I assumed is small and would only take seconds to built and solve. I’ve been working with CPLEX/Gurobi quite a lot, just not in combination with Julia, so I expected …

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## [Fixing parameter values when solving inverse problem using DiffEqFlux](https://discourse.julialang.org/t/fixing-parameter-values-when-solving-inverse-problem-using-diffeqflux/64963)

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**Author:** [@juliascrub](https://discourse.julialang.org/u/juliascrub)\
**Replies:** 1\
**Last updated:** [July 20, 2021, 4:27am UTC](https://discourse.julialang.org/t/fixing-parameter-values-when-solving-inverse-problem-using-diffeqflux/64963 "2021-07-20T04:27:12Z")

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Is there a way to fix certain parameters when using sciml\_train? I could manually override them in the loss function like below but am curious if theres a better way function loss(p) overridden\_p = p but with some p…

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## [Unpredictable learning of neural network based controller for dc motor](https://discourse.julialang.org/t/unpredictable-learning-of-neural-network-based-controller-for-dc-motor/64960)

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**Author:** [@shafeeq\_Elanattil](https://discourse.julialang.org/u/shafeeq_Elanattil)\
**Replies:** 2\
**Last updated:** [July 20, 2021, 4:22am UTC](https://discourse.julialang.org/t/unpredictable-learning-of-neural-network-based-controller-for-dc-motor/64960 "2021-07-20T04:22:14Z")

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Hello, I am new to the Julia language. I am trying to make neural network based position controller using Julia libraries. My code is given below. J = 0.1999 Ke = 2.1918 Kt = 38.185 L = 0.020453 R = 3.9694 Tq = 0.20142…

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## [How do I use Plots with MPIClusterManagers in "only workers" mode?](https://discourse.julialang.org/t/how-do-i-use-plots-with-mpiclustermanagers-in-only-workers-mode/64286)

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**Author:** [@giancarloantonucci](https://discourse.julialang.org/u/giancarloantonucci)\
**Replies:** 2\
**Last updated:** [July 19, 2021, 10:30pm UTC](https://discourse.julialang.org/t/how-do-i-use-plots-with-mpiclustermanagers-in-only-workers-mode/64286 "2021-07-19T22:30:12Z")

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I find that @mpi\_do from MPIClusterManagers.jl is great with Jupiter notebooks. However, I’m not able to plot anything from within @mpi\_do: using MPIClusterManagers using Distributed manager = MPIManager(np = 4) addproc…

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## [ZygoteRules dispatch on traits?](https://discourse.julialang.org/t/zygoterules-dispatch-on-traits/64869)

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**Author:** [@lamorton](https://discourse.julialang.org/u/lamorton)\
**Replies:** 2\
**Last updated:** [July 19, 2021, 5:52pm UTC](https://discourse.julialang.org/t/zygoterules-dispatch-on-traits/64869 "2021-07-19T17:52:05Z")

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Is it possible to specialize a ZygoteRule using a Holy trait? I’m not sure how I would go about doing this.

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## [Cond() error: LinearAlgebra and BigFloats incompatible?](https://discourse.julialang.org/t/cond-error-linearalgebra-and-bigfloats-incompatible/64924)

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**Author:** [@damonturney](https://discourse.julialang.org/u/damonturney)\
**Replies:** 3\
**Last updated:** [July 19, 2021, 5:46pm UTC](https://discourse.julialang.org/t/cond-error-linearalgebra-and-bigfloats-incompatible/64924 "2021-07-19T17:46:57Z")

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In the course of building my simulation of chemicals in an operating battery, I need to invert matrices that are ill-conditioned (condition number near 1E15). My strategy was to use a matrix of BigFloats because they ca…

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## [Running For loops on GPU](https://discourse.julialang.org/t/running-for-loops-on-gpu/1553)

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**Author:** [@deepakagrawal](https://discourse.julialang.org/u/deepakagrawal)\
**Replies:** 11\
**Last updated:** [July 19, 2021, 5:39pm UTC](https://discourse.julialang.org/t/running-for-loops-on-gpu/1553 "2021-07-19T17:39:41Z")

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I am trying to do simulation in which I am repeating same function multiple times Changing several parameters Is there a way I can do any of them via a for loop or some other way on GPU? I am new to Julia. Any help o…

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## [Treemap subplot in PlotlyJS](https://discourse.julialang.org/t/treemap-subplot-in-plotlyjs/64759)

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**Author:** [@stej](https://discourse.julialang.org/u/stej)\
**Replies:** 3\
**Last updated:** [July 19, 2021, 5:18pm UTC](https://discourse.julialang.org/t/treemap-subplot-in-plotlyjs/64759 "2021-07-19T17:18:06Z")

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I wanted to use a treemap in PlotlyJS. There is no method like this, so I create that by hand. fieldsa = Dict{Symbol,Any}(:type =\> "treemap", :labels =\> \["a", "A"\], :parents =\> \["", ""\], :values =\> \[1, 10\], …

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## [Turing.jl - Error running tutorial code](https://discourse.julialang.org/t/turing-jl-error-running-tutorial-code/64867)

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**Author:** [@v-i-s-h](https://discourse.julialang.org/u/v-i-s-h)\
**Replies:** 2\
**Last updated:** [July 19, 2021, 1:23pm UTC](https://discourse.julialang.org/t/turing-jl-error-running-tutorial-code/64867 "2021-07-19T13:23:54Z")

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I was try Turing.jl tutorial code for Bayesian Neural networks (Bayesian Neural Networks) When I try to run the Variational inference code (code below) using Bijectors using Turing: Variational using AdvancedVI m = ba…

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## [Why does \`Flux.stack\` use splatting?](https://discourse.julialang.org/t/why-does-flux-stack-use-splatting/64923)

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**Author:** [@bad\_at\_math](https://discourse.julialang.org/u/bad_at_math)\
**Replies:** 1\
**Last updated:** [July 19, 2021, 1:12pm UTC](https://discourse.julialang.org/t/why-does-flux-stack-use-splatting/64923 "2021-07-19T13:12:49Z")

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The Flux.stack function is defined here: https://github.com/FluxML/Flux.jl/blob/b78a27b01c9629099adb059a98657b995760b617/src/utils.jl#L476, and it is very simple: stack(xs, dim) = cat(unsqueeze.(xs, dim)..., dims=dim). …

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## [Streamplot statemap using JSServe](https://discourse.julialang.org/t/streamplot-statemap-using-jsserve/64337)

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**Author:** [@EvoArt](https://discourse.julialang.org/u/EvoArt)\
**Replies:** 13\
**Last updated:** [July 19, 2021, 10:52am UTC](https://discourse.julialang.org/t/streamplot-statemap-using-jsserve/64337 "2021-07-19T10:52:33Z")

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I’m trying to record a statemap to include an interactive streamplot in a web page. Is there a way to pull out the actual Float64 value from the observable? Thanks in advance. using WGLMakie, JSServe WGLMakie.activate!…

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## [Use the non-missing elements of DataFrame A to update DataFrame B](https://discourse.julialang.org/t/use-the-non-missing-elements-of-dataframe-a-to-update-dataframe-b/64658)

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**Author:** [@fipelle](https://discourse.julialang.org/u/fipelle)\
**Replies:** 9\
**Last updated:** [July 18, 2021, 8:53am UTC](https://discourse.julialang.org/t/use-the-non-missing-elements-of-dataframe-a-to-update-dataframe-b/64658 "2021-07-18T08:53:57Z")

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Hi, I am trying to find an elegant solution to update a DataFrame (B), using the non-missing elements in another DataFrame (A) with the same columns. For instance, with using Dates, DataFrames; # Dates date\_1 = Date("…

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## [How to center a text with Luxor](https://discourse.julialang.org/t/how-to-center-a-text-with-luxor/55125)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 4\
**Last updated:** [July 18, 2021, 8:22am UTC](https://discourse.julialang.org/t/how-to-center-a-text-with-luxor/55125 "2021-07-18T08:22:14Z")

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I am trying to create simple images with a text made of a few digits on the center. The problem is that I need to manually offset the position, is there a way to make it “centered” in a visual sense, i.e. where the spa…

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## [How to make GLFW window non blocking](https://discourse.julialang.org/t/how-to-make-glfw-window-non-blocking/64804)

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**Author:** [@Jakub\_Mitura](https://discourse.julialang.org/u/Jakub_Mitura)\
**Replies:** 1\
**Last updated:** [July 18, 2021, 4:15am UTC](https://discourse.julialang.org/t/how-to-make-glfw-window-non-blocking/64804 "2021-07-18T04:15:57Z")

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Hello I am creating some openGL GUI and I have probably simple to solve problem - I want to have the rendering loop non blocking i.e so for example I will be able to run the openGL app and make it possible to 1) respond…

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## [Need help with loading plots in dash](https://discourse.julialang.org/t/need-help-with-loading-plots-in-dash/64841)

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**Author:** [@Goku](https://discourse.julialang.org/u/Goku)\
**Replies:** 0\
**Last updated:** [July 18, 2021, 1:00am UTC](https://discourse.julialang.org/t/need-help-with-loading-plots-in-dash/64841 "2021-07-18T01:00:25Z")

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I am trying to host this plot in dash, but I am getting the following error: Error loading layout Full Code: using CSV, DataFrames, Dates, Plots using Dash, DashHtmlComponents, DashCoreComponents plotly() df = CSV…

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## [DP5() algorithm failing to solve simple SIR problem?](https://discourse.julialang.org/t/dp5-algorithm-failing-to-solve-simple-sir-problem/64835)

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**Author:** [@Michael\_Barmann](https://discourse.julialang.org/u/Michael_Barmann)\
**Replies:** 1\
**Last updated:** [July 17, 2021, 11:34pm UTC](https://discourse.julialang.org/t/dp5-algorithm-failing-to-solve-simple-sir-problem/64835 "2021-07-17T23:34:05Z")

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While testing out different ODE solvers, I found that DP5() completely fails when given a simple SIR model (while other solvers handle it perfectly fine): function SIR!(du,u,pars,t) β, γ = pars S, I, R = u …

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## [Range constraint](https://discourse.julialang.org/t/range-constraint/64819)

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**Author:** [@mjanun](https://discourse.julialang.org/u/mjanun)\
**Replies:** 10\
**Last updated:** [July 17, 2021, 9:35pm UTC](https://discourse.julialang.org/t/range-constraint/64819 "2021-07-17T21:35:16Z")

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I have a constraint that can be either a range or an equality depending upon whether a user passes a range (i.e. two arguments) or a single value as a constraint. I convert the range constraint to an equality using the s…

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## [Join vs innerjoin and pkg updating](https://discourse.julialang.org/t/join-vs-innerjoin-and-pkg-updating/64778)

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**Author:** [@davidoff](https://discourse.julialang.org/u/davidoff)\
**Replies:** 10\
**Last updated:** [July 17, 2021, 1:30am UTC](https://discourse.julialang.org/t/join-vs-innerjoin-and-pkg-updating/64778 "2021-07-17T01:30:55Z")

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I have the same version of Julia and same Pkg.update() vintage on 2 different computers. On one, when I merge data frames, I use join() and the other innerjoin() – on each of the two computers, the alternative join comma…

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## [Help with Turing.jl model using Categorical, Normal and ordered constraint](https://discourse.julialang.org/t/help-with-turing-jl-model-using-categorical-normal-and-ordered-constraint/64765)

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**Author:** [@Hakan\_Kjellerstrand](https://discourse.julialang.org/u/Hakan_Kjellerstrand)\
**Replies:** 2\
**Last updated:** [July 16, 2021, 9:05pm UTC](https://discourse.julialang.org/t/help-with-turing-jl-model-using-categorical-normal-and-ordered-constraint/64765 "2021-07-16T21:05:06Z")

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I’m trying to model AllenDowney’s three problems “How tall is A?” (How tall is A? – Probably Overthinking It ): 1) Suppose you meet an adult resident of the U.S. who is 170 cm tall. What is the probability that th…

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## [Order of groupedbar](https://discourse.julialang.org/t/order-of-groupedbar/64749)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 1\
**Last updated:** [July 16, 2021, 7:32pm UTC](https://discourse.julialang.org/t/order-of-groupedbar/64749 "2021-07-16T19:32:10Z")

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I have the following plot of a Likert scale: StatsPlots.groupedbar( repeat(questions, outer = 5), weights, group=repeat(\["1", "2", "3", "4", "5"\], inner=length(questions)), bar\_position=:stack, o…

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## [Chi-Square test of a sample](https://discourse.julialang.org/t/chi-square-test-of-a-sample/63617)

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**Author:** [@Mariana](https://discourse.julialang.org/u/Mariana)\
**Replies:** 19\
**Last updated:** [July 16, 2021, 8:50am UTC](https://discourse.julialang.org/t/chi-square-test-of-a-sample/63617 "2021-07-16T08:50:22Z")

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Hello! I am working on a project in which I was given a random sample, and now I want to identify, among 3 distributions, which one created this sample. By plotting a histogram, it seems that the gamma distribution is …

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## [BERT models from huggingface - Transformers.jl](https://discourse.julialang.org/t/bert-models-from-huggingface-transformers-jl/64453)

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**Author:** [@Alex\_Tantos](https://discourse.julialang.org/u/Alex_Tantos)\
**Replies:** 1\
**Last updated:** [July 15, 2021, 10:50pm UTC](https://discourse.julialang.org/t/bert-models-from-huggingface-transformers-jl/64453 "2021-07-15T22:50:32Z")

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Hi! @chengchingwen Am planning to use an already pre-trained BERT model for Greek published in huggingface. As we know for using this type of pre-trained models, one depends on python’s hugginface and pytorch. I know t…

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## [Histogram counts in bin under mouse hover](https://discourse.julialang.org/t/histogram-counts-in-bin-under-mouse-hover/53743)

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**Author:** [@mocalvao](https://discourse.julialang.org/u/mocalvao)\
**Replies:** 0\
**Last updated:** [January 21, 2021, 8:01pm UTC](https://discourse.julialang.org/t/histogram-counts-in-bin-under-mouse-hover/53743 "2021-01-21T20:01:01Z")

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I would like to make a histogram, under IJulia jupyter notebook, such that, when I hover the mouse over the bars, I get the number of ocurrences within the corresponding bins, as a tooltip. My MWE is: using PlotlyJS plo…

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