# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=335

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 336

---

## [Who "Symbolics.jl" is for?](https://discourse.julialang.org/t/who-symbolics-jl-is-for/68458)

<div class="topic-metadata">

**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 5\
**Last updated:** [September 20, 2021, 8:01pm UTC](https://discourse.julialang.org/t/who-symbolics-jl-is-for/68458 "2021-09-20T20:01:14Z")

</div>

Just a generic question on who is the target user for the Symbolics.jl package. I had a quick look on it, looking to find some alternative to the python-based SymPy (and the SymPy.jl wrapper), but I have now doubts if t…

---

## [Problem computing Jacobian with Symbolics.jl 3.3](https://discourse.julialang.org/t/problem-computing-jacobian-with-symbolics-jl-3-3/68336)

<div class="topic-metadata">

**Author:** [@prittjam](https://discourse.julialang.org/u/prittjam)\
**Replies:** 5\
**Last updated:** [September 20, 2021, 7:59pm UTC](https://discourse.julialang.org/t/problem-computing-jacobian-with-symbolics-jl-3-3/68336 "2021-09-20T19:59:39Z")

</div>

I’m using Julia v.1.6.2 and the package Symbolic v.3.3. I have a simple script to compute that Jacobian that gives an error: typeusing Symbolics using LinearAlgebra renormI(x) = x ./ x\[\[end\],:\] homogenize(x) = \[x; o…

---

## [Using Symbolics to simplify Boolean algebra](https://discourse.julialang.org/t/using-symbolics-to-simplify-boolean-algebra/68473)

<div class="topic-metadata">

**Author:** [@Tomas\_Pevny](https://discourse.julialang.org/u/Tomas_Pevny)\
**Replies:** 4\
**Last updated:** [September 20, 2021, 7:31pm UTC](https://discourse.julialang.org/t/using-symbolics-to-simplify-boolean-algebra/68473 "2021-09-20T19:31:58Z")

</div>

Dear All, I would like to ask, if it would be possible to use Symbolics to simplify Boolean rules. For example using Symbolics x = SymbolicUtils.Sym{Real}(:x) simplify((x \> 1) & (x \> 2)) should return (x \> 1)? Or am…

---

## [ModelingToolkit parameter fit: keep some parameters fixed](https://discourse.julialang.org/t/modelingtoolkit-parameter-fit-keep-some-parameters-fixed/67760)

<div class="topic-metadata">

**Author:** [@misa](https://discourse.julialang.org/u/misa)\
**Replies:** 3\
**Last updated:** [September 20, 2021, 7:22pm UTC](https://discourse.julialang.org/t/modelingtoolkit-parameter-fit-keep-some-parameters-fixed/67760 "2021-09-20T19:22:12Z")

</div>

I am trying to fit parameters in a ModelingToolkit model using DiffEqParamEstim. This works well when fitting all parameters contained in the model, but I would like to keep some of them fixed. For example, in the follow…

---

## [Help with Normal Distribution](https://discourse.julialang.org/t/help-with-normal-distribution/68486)

<div class="topic-metadata">

**Author:** [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Replies:** 1\
**Last updated:** [September 20, 2021, 5:07pm UTC](https://discourse.julialang.org/t/help-with-normal-distribution/68486 "2021-09-20T17:07:51Z")

</div>

Because when I compile my model I get the following error message: MethodError: no method matching Normal(; μ=0.16, σ=0.05) using JuMP, Gurobi, Random, Distributions Modelmathematical = Model(Gurobi.Optimizer) a = 280…

---

## [Format date axis](https://discourse.julialang.org/t/format-date-axis/68352)

<div class="topic-metadata">

**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 1\
**Last updated:** [September 20, 2021, 9:06am UTC](https://discourse.julialang.org/t/format-date-axis/68352 "2021-09-20T09:06:57Z")

</div>

I only want to show the month and day like mm-01 for each month, excluding the year. How can I do that? using Dates, AlgebraOfGraphics let dates = Date(2010,1,1):Day(1):Date(2010,12,31) p = data((dates=dates, values=ra…

---

## [Plotting bipartite graph](https://discourse.julialang.org/t/plotting-bipartite-graph/68443)

<div class="topic-metadata">

**Author:** [@sardinecan](https://discourse.julialang.org/u/sardinecan)\
**Replies:** 0\
**Last updated:** [September 20, 2021, 7:43am UTC](https://discourse.julialang.org/t/plotting-bipartite-graph/68443 "2021-09-20T07:43:23Z")

</div>

Hi everyone! I would like to know if there is a way with GraphPlot and gplot() to make a simple bipartite graph representation (one “column” for each node category) ? Here is a small sample of my code bigraph = Met…

---

## [How to make GLMakie "open interactive windows" from Jupyter](https://discourse.julialang.org/t/how-to-make-glmakie-open-interactive-windows-from-jupyter/68299)

<div class="topic-metadata">

**Author:** [@maxkapur](https://discourse.julialang.org/u/maxkapur)\
**Replies:** 3\
**Last updated:** [September 20, 2021, 7:33am UTC](https://discourse.julialang.org/t/how-to-make-glmakie-open-interactive-windows-from-jupyter/68299 "2021-09-20T07:33:22Z")

</div>

I am trying to reproduce a simple plot with a slider from the Makie docs. I read in the Makie basic tutorial To see the output of plotting commands when using CairoMakie, we recommend you either use an IDE which suppo…

---

## [Category-type axis in a scatter plot](https://discourse.julialang.org/t/category-type-axis-in-a-scatter-plot/68382)

<div class="topic-metadata">

**Author:** [@emchateau](https://discourse.julialang.org/u/emchateau)\
**Replies:** 2\
**Last updated:** [September 19, 2021, 10:40pm UTC](https://discourse.julialang.org/t/category-type-axis-in-a-scatter-plot/68382 "2021-09-19T22:40:25Z")

</div>

Hi, I would like to give a category-type in x-axis of a scatter plot. I’ve seen the xaxis discrete\_values attribute (cf. Axis Attributes · Plots) But I couldn’t find a way to use it nor any working exemple. Ex. using …

---

## [How to do non-centered parameterization in Turing](https://discourse.julialang.org/t/how-to-do-non-centered-parameterization-in-turing/44702)

<div class="topic-metadata">

**Author:** [@vkv](https://discourse.julialang.org/u/vkv)\
**Replies:** 13\
**Last updated:** [September 19, 2021, 9:38am UTC](https://discourse.julialang.org/t/how-to-do-non-centered-parameterization-in-turing/44702 "2021-09-19T09:38:50Z")

</div>

k is a random variable k ~ Normal(μ, σ), μ and σ have some other priors. I want to use a non-centered parameterization of the prior. I want to do something like this k\_ ~ Normal(0, 1) k = k\_ \* σ + μ Since the above doe…

---

## [Writing Arrow record batch requires a lot of RAM](https://discourse.julialang.org/t/writing-arrow-record-batch-requires-a-lot-of-ram/68313)

<div class="topic-metadata">

**Author:** [@kobusherbst](https://discourse.julialang.org/u/kobusherbst)\
**Replies:** 5\
**Last updated:** [September 19, 2021, 4:31am UTC](https://discourse.julialang.org/t/writing-arrow-record-batch-requires-a-lot-of-ram/68313 "2021-09-19T04:31:25Z")

</div>

I am using this function to save a batch Arrow files into a single Arrow file with record batches: function combinebatches(path::String, file::String, batches) files = Array{String,1}() for i = 1:batches …

---

## [Econometrics.jl vs. R's plm](https://discourse.julialang.org/t/econometrics-jl-vs-rs-plm/68345)

<div class="topic-metadata">

**Author:** [@mthelm85](https://discourse.julialang.org/u/mthelm85)\
**Replies:** 2\
**Last updated:** [September 18, 2021, 3:24pm UTC](https://discourse.julialang.org/t/econometrics-jl-vs-rs-plm/68345 "2021-09-18T15:24:21Z")

</div>

I’m working through the Econometrics With R online book, specifically the example in 10.3 on fixed effects regression, but I’m trying to follow along with Econometrics.jl. Here’s the full code to reproduce the example: …

---

## [What are the advantages of using @recipe in Plots vs import RecipesBase.plot?](https://discourse.julialang.org/t/what-are-the-advantages-of-using-recipe-in-plots-vs-import-recipesbase-plot/68366)

<div class="topic-metadata">

**Author:** [@viraltux](https://discourse.julialang.org/u/viraltux)\
**Replies:** 0\
**Last updated:** [September 18, 2021, 10:06am UTC](https://discourse.julialang.org/t/what-are-the-advantages-of-using-recipe-in-plots-vs-import-recipesbase-plot/68366 "2021-09-18T10:06:25Z")

</div>

@recipe is described in its docstring as This functionality is primarily geared to turning user types and settings into the data and attributes that describe a Plots.jl visualization. The example given to dispatch o…

---

## [Materials to better understand Econometrics.jl absorb feature](https://discourse.julialang.org/t/materials-to-better-understand-econometrics-jl-absorb-feature/68276)

<div class="topic-metadata">

**Author:** [@mthelm85](https://discourse.julialang.org/u/mthelm85)\
**Replies:** 3\
**Last updated:** [September 17, 2021, 5:02pm UTC](https://discourse.julialang.org/t/materials-to-better-understand-econometrics-jl-absorb-feature/68276 "2021-09-17T17:02:01Z")

</div>

This is only a little bit of a Julia question and mostly a question about where to find materials for learning econometrics, but: I’m wondering if anyone can suggest good materials for learning about modelling techniques…

---

## [I've made a small step-by-step tutorial to using Flux for image recognition](https://discourse.julialang.org/t/ive-made-a-small-step-by-step-tutorial-to-using-flux-for-image-recognition/68261)

<div class="topic-metadata">

**Author:** [@Qfl3x](https://discourse.julialang.org/u/Qfl3x)\
**Replies:** 6\
**Last updated:** [September 17, 2021, 4:09pm UTC](https://discourse.julialang.org/t/ive-made-a-small-step-by-step-tutorial-to-using-flux-for-image-recognition/68261 "2021-09-17T16:09:55Z")

</div>

I was trying to model a simple character recognition in Flux and almost lost my sanity due to the lack of tutorials and the ones that do exist were quite outdated. So after some head banging I’ve made a small tutorial to…

---

## [How to create a system image with Makie.jl](https://discourse.julialang.org/t/how-to-create-a-system-image-with-makie-jl/55493)

<div class="topic-metadata">

**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 8\
**Last updated:** [September 17, 2021, 2:17pm UTC](https://discourse.julialang.org/t/how-to-create-a-system-image-with-makie-jl/55493 "2021-09-17T14:17:10Z")

</div>

I created a system image containing Makie.jl using the following steps: julia --project \]add PackageCompiler add MakieGallery exit() julia --project using MakieGallery exit() julia --project using Makie using PackageC…

---

## [Unable to change the tick font size when using ticks = :native with Plots.jl and pgfplotsx backend](https://discourse.julialang.org/t/unable-to-change-the-tick-font-size-when-using-ticks-native-with-plots-jl-and-pgfplotsx-backend/68106)

<div class="topic-metadata">

**Author:** [@deepakvinod](https://discourse.julialang.org/u/deepakvinod)\
**Replies:** 15\
**Last updated:** [September 17, 2021, 1:34pm UTC](https://discourse.julialang.org/t/unable-to-change-the-tick-font-size-when-using-ticks-native-with-plots-jl-and-pgfplotsx-backend/68106 "2021-09-17T13:34:45Z")

</div>

I am relatively new to Julia (coming from python and matplotlib) and have been trying to generate some plots for a project I am working on. It seems to be a known issue that Plots.jl does not produce ticks when there ar…

---

## [Turing.jl or SciML?: training and testing on different datasets](https://discourse.julialang.org/t/turing-jl-or-sciml-training-and-testing-on-different-datasets/68330)

<div class="topic-metadata">

**Author:** [@James\_Gorman](https://discourse.julialang.org/u/James_Gorman)\
**Replies:** 0\
**Last updated:** [September 17, 2021, 12:23pm UTC](https://discourse.julialang.org/t/turing-jl-or-sciml-training-and-testing-on-different-datasets/68330 "2021-09-17T12:23:04Z")

</div>

I am new to doing Bayesian inference, so I wanted to start off with doing a simple regression (here, assumed to be a linear regression). I decided to use Turing.jl, and through the tutorials and previous questions I was …

---

## [Setting up a small compute cluster](https://discourse.julialang.org/t/setting-up-a-small-compute-cluster/50622)

<div class="topic-metadata">

**Author:** [@maxfreu](https://discourse.julialang.org/u/maxfreu)\
**Replies:** 16\
**Last updated:** [September 17, 2021, 9:54am UTC](https://discourse.julialang.org/t/setting-up-a-small-compute-cluster/50622 "2021-09-17T09:54:59Z")

</div>

Hi everybody! I would like to set up a “compute cluster” with 4-5 computers in my workgroup. It should be able to run more or less arbitrary code, so it’s maybe not a totally julia-specific question, but in the end I wo…

---

## [JuMP+Ipopt producing infeasible solutions for constraints with small upper bounds](https://discourse.julialang.org/t/jump-ipopt-producing-infeasible-solutions-for-constraints-with-small-upper-bounds/68306)

<div class="topic-metadata">

**Author:** [@maxkapur](https://discourse.julialang.org/u/maxkapur)\
**Replies:** 2\
**Last updated:** [September 17, 2021, 5:30am UTC](https://discourse.julialang.org/t/jump-ipopt-producing-infeasible-solutions-for-constraints-with-small-upper-bounds/68306 "2021-09-17T05:30:19Z")

</div>

using JuMP, Ipopt function parametertest() m = Model(Ipopt.Optimizer) set\_silent(m) a = \[0.15, 0.16, 0.72, -0.80, -12.0\] @variable(m, x\[1:5\]) @variable(m, abs\_x\[1:5\]) for i in 1:5 …

---

## [Unable to run Makie in VS Code + WSL 2](https://discourse.julialang.org/t/unable-to-run-makie-in-vs-code-wsl-2/68305)

<div class="topic-metadata">

**Author:** [@tmwatchanan](https://discourse.julialang.org/u/tmwatchanan)\
**Replies:** 0\
**Last updated:** [September 17, 2021, 4:56am UTC](https://discourse.julialang.org/t/unable-to-run-makie-in-vs-code-wsl-2/68305 "2021-09-17T04:56:35Z")

</div>

I could be able to run Makie, say plot a simple line, by executing the Julia code in WSL 2. However, when I tried to run the same code with VS Code REPL, it didn’t work. So, I decided to give Persistent Session a try. I …

---

## [Paste an image onto another image?](https://discourse.julialang.org/t/paste-an-image-onto-another-image/68033)

<div class="topic-metadata">

**Author:** [@vshesh](https://discourse.julialang.org/u/vshesh)\
**Replies:** 2\
**Last updated:** [September 17, 2021, 12:08am UTC](https://discourse.julialang.org/t/paste-an-image-onto-another-image/68033 "2021-09-17T00:08:13Z")

</div>

What is Julia’s equivalent of python PIL Image.paste? And how would I paste a rotated image onto a background image? (everything below is just context, that’s the question) I am trying to use Julia to make a dataset of…

---

## [NaN returned by gauss()](https://discourse.julialang.org/t/nan-returned-by-gauss/68260)

<div class="topic-metadata">

**Author:** [@trg818](https://discourse.julialang.org/u/trg818)\
**Replies:** 6\
**Last updated:** [September 16, 2021, 7:33pm UTC](https://discourse.julialang.org/t/nan-returned-by-gauss/68260 "2021-09-16T19:33:37Z")

</div>

I’m using the function gauss() from QuadGK in order to calculate a non-adaptive quadrature and am irritated about the appearance of NaN beyond a certain N. Specifically, gauss(1093,38.68598671891722,150000.0) returns an …

---

## [What is the best tool to use for weighting matrices](https://discourse.julialang.org/t/what-is-the-best-tool-to-use-for-weighting-matrices/68218)

<div class="topic-metadata">

**Author:** [@Nenndul](https://discourse.julialang.org/u/Nenndul)\
**Replies:** 8\
**Last updated:** [September 16, 2021, 8:18pm UTC](https://discourse.julialang.org/t/what-is-the-best-tool-to-use-for-weighting-matrices/68218 "2021-09-16T20:18:10Z")

</div>

I have a problem that involves combining several matrices with a weighted average to optimize for a given feature, such as the average value of over the data in the resulting matrix. The setup is essentially like this. …

---

## [How to choose which parameters to estimate in parameter estimation when using diffeqflux.sciml\_train and BBO?](https://discourse.julialang.org/t/how-to-choose-which-parameters-to-estimate-in-parameter-estimation-when-using-diffeqflux-sciml-train-and-bbo/68280)

<div class="topic-metadata">

**Author:** [@shwetank\_verma](https://discourse.julialang.org/u/shwetank_verma)\
**Replies:** 1\
**Last updated:** [September 16, 2021, 7:52pm UTC](https://discourse.julialang.org/t/how-to-choose-which-parameters-to-estimate-in-parameter-estimation-when-using-diffeqflux-sciml-train-and-bbo/68280 "2021-09-16T19:52:26Z")

</div>

Hey everyone, I am trying to do parameter estimation for a set of differential equations using diffeqflux\_sciml\_train and BBO. However, I would like to choose which parameters I want to estimate and which ones I don’t wa…

---

## [Package for multi label classification](https://discourse.julialang.org/t/package-for-multi-label-classification/46156)

<div class="topic-metadata">

**Author:** [@Rajeev\_Gangal](https://discourse.julialang.org/u/Rajeev_Gangal)\
**Replies:** 2\
**Last updated:** [September 16, 2021, 5:11pm UTC](https://discourse.julialang.org/t/package-for-multi-label-classification/46156 "2021-09-16T17:11:35Z")

</div>

What’s the best ML package to use for multi-label classification in Julia? Hopefully, it will have multiple algorithms. Else, do suggest particular packages too. MLJ? Flux? or TensorFlow etc

---

## [NamedVecs.jl - Is this a good idea?](https://discourse.julialang.org/t/namedvecs-jl-is-this-a-good-idea/68275)

<div class="topic-metadata">

**Author:** [@Per](https://discourse.julialang.org/u/Per)\
**Replies:** 4\
**Last updated:** [September 16, 2021, 4:41pm UTC](https://discourse.julialang.org/t/namedvecs-jl-is-this-a-good-idea/68275 "2021-09-16T16:41:49Z")

</div>

The Julia ecosystem is reaching a size where, if something seems like a good idea, there’s probably a package for it. And conversely, if there is no package, then there’s probably a reason why such a package is not a goo…

---

## [Multiple camera views on same scene in Makie](https://discourse.julialang.org/t/multiple-camera-views-on-same-scene-in-makie/68274)

<div class="topic-metadata">

**Author:** [@goretkin](https://discourse.julialang.org/u/goretkin)\
**Replies:** 3\
**Last updated:** [September 16, 2021, 4:22pm UTC](https://discourse.julialang.org/t/multiple-camera-views-on-same-scene-in-makie/68274 "2021-09-16T16:22:03Z")

</div>

I’d like to have two views of the same scene / data in Makie. Below is code for the output that I want, but I would like to just have one call to scatter! (for example). using Makie: Makie, Observable using GLMakie: GLM…

---

## [Running a pre-trained BERT on twitter data using Flux.jl Transformer.jl](https://discourse.julialang.org/t/running-a-pre-trained-bert-on-twitter-data-using-flux-jl-transformer-jl/67721)

<div class="topic-metadata">

**Author:** [@Storopoli](https://discourse.julialang.org/u/Storopoli)\
**Replies:** 17\
**Last updated:** [September 16, 2021, 9:24am UTC](https://discourse.julialang.org/t/running-a-pre-trained-bert-on-twitter-data-using-flux-jl-transformer-jl/67721 "2021-09-16T09:24:41Z")

</div>

Hi everybody! I have 8k labelled twitter data with either a 0 or 1 (binary classification). MLJ.jl with classical machine learning has not very good performance with the problem. I am trying to fit a pre-trained BERT t…

---

## [Rew file format in MOI.FileFormats / JuMP](https://discourse.julialang.org/t/rew-file-format-in-moi-fileformats-jump/68238)

<div class="topic-metadata">

**Author:** [@obar](https://discourse.julialang.org/u/obar)\
**Replies:** 2\
**Last updated:** [September 16, 2021, 1:54am UTC](https://discourse.julialang.org/t/rew-file-format-in-moi-fileformats-jump/68238 "2021-09-16T01:54:35Z")

</div>

Would it be possible to include support for .rew model file formats in JuMP? It is sometimes useful to share models where a risk of leaking proprietary information is present (e.g. here) and .mps files contain constrain…

[Previous page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=334)

[Next page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=336)