# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=338

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**Page:** 339

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## [State of automatic differentiation in Julia](https://discourse.julialang.org/t/state-of-automatic-differentiation-in-julia/43083)

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**Author:** [@Samuel\_Ainsworth](https://discourse.julialang.org/u/Samuel_Ainsworth)\
**Replies:** 56\
**Last updated:** [September 8, 2021, 2:16pm UTC](https://discourse.julialang.org/t/state-of-automatic-differentiation-in-julia/43083 "2021-09-08T14:16:12Z")

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There seems to be a plethora of AD frameworks in Julia. I’m curious what the state of the ecosystem looks like currently. I’m aware of the following packages: FowardDiff ForwardDiff2 Nabla Tracker Yota Zygote ReverseD…

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## [Replicating ologit results from Econometrics.jl](https://discourse.julialang.org/t/replicating-ologit-results-from-econometrics-jl/67819)

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**Author:** [@amrods](https://discourse.julialang.org/u/amrods)\
**Replies:** 6\
**Last updated:** [September 8, 2021, 9:51am UTC](https://discourse.julialang.org/t/replicating-ologit-results-from-econometrics-jl/67819 "2021-09-08T09:51:42Z")

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I’m having a hard time replicating the results of an ordered logit regression in Econometrics.jl. The code for the estimation is done here. The objective function is here. Here is my implementation (you can download the…

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## [Adding a row to SQLite.jl database](https://discourse.julialang.org/t/adding-a-row-to-sqlite-jl-database/44139)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 5\
**Last updated:** [August 24, 2021, 6:03pm UTC](https://discourse.julialang.org/t/adding-a-row-to-sqlite-jl-database/44139 "2021-08-24T18:03:00Z")

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How do you add a row to a SQLite.jl database? julia\> using SQLite julia\> db = SQLite.DB("temp.sqlite") SQLite.DB("temp.sqlite") julia\> SQLite.createtable!(db, "Primes", Tables.Schema(("index", "prime"), (Int, Int))) No…

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## [Adaptive methods for image contrast stretching?](https://discourse.julialang.org/t/adaptive-methods-for-image-contrast-stretching/67774)

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**Author:** [@babaq](https://discourse.julialang.org/u/babaq)\
**Replies:** 1\
**Last updated:** [September 8, 2021, 7:51am UTC](https://discourse.julialang.org/t/adaptive-methods-for-image-contrast-stretching/67774 "2021-09-08T07:51:50Z")

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Hi, I have an image with small repeating structures, which need to be stretched in the same range(0-1). My intuition is to partition the image to many small tiles, and apply contrast linear stretching for each tile,…

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## [Simple Regression using DiffEqFlux](https://discourse.julialang.org/t/simple-regression-using-diffeqflux/66842)

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**Author:** [@amit1](https://discourse.julialang.org/u/amit1)\
**Replies:** 6\
**Last updated:** [September 8, 2021, 6:27am UTC](https://discourse.julialang.org/t/simple-regression-using-diffeqflux/66842 "2021-09-08T06:27:53Z")

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I am trying to work out a simple application of NeuralODE for regression problems, based on the following tutorial. Core idea here being (as per my understanding) that regression problems can be modelled as y = \\int\_{…

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## [Conjugate gradient with incomplete Cholesky preconditioner](https://discourse.julialang.org/t/conjugate-gradient-with-incomplete-cholesky-preconditioner/7809)

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**Author:** [@mohamed82008](https://discourse.julialang.org/u/mohamed82008)\
**Replies:** 22\
**Last updated:** [September 6, 2021, 10:27pm UTC](https://discourse.julialang.org/t/conjugate-gradient-with-incomplete-cholesky-preconditioner/7809 "2021-09-06T22:27:13Z")

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I have been trying my luck with using the conjugate gradient method to solve a sparse symmetric positive definite system of equations. I found IterativeSolvers.jl, Krylov.jl and KrylovMethods.jl, of which the first seems…

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## [Annotations in Makie.jl](https://discourse.julialang.org/t/annotations-in-makie-jl/55773)

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**Author:** [@TheLateKronos](https://discourse.julialang.org/u/TheLateKronos)\
**Replies:** 4\
**Last updated:** [September 7, 2021, 8:50pm UTC](https://discourse.julialang.org/t/annotations-in-makie-jl/55773 "2021-09-07T20:50:50Z")

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Is it currently possible to annotate Makie-plots? I am thinking about having text at the root of an arrow that point to some location in the plot. I am imagining that one could DIY it by plotting a vector, and possible p…

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## [Permute x and y axes of a \`Makie.Axis\`](https://discourse.julialang.org/t/permute-x-and-y-axes-of-a-makie-axis/67826)

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**Author:** [@goretkin](https://discourse.julialang.org/u/goretkin)\
**Replies:** 2\
**Last updated:** [September 7, 2021, 8:21pm UTC](https://discourse.julialang.org/t/permute-x-and-y-axes-of-a-makie-axis/67826 "2021-09-07T20:21:21Z")

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This example shows how to reverse the direction of the x- and y-axis. However, I am interested in plotting the first coordinate of data along the vertical axis, and the second coordinate of data along the horizontal axis…

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## [Normal Inverse Gaussian distribution in Turing](https://discourse.julialang.org/t/normal-inverse-gaussian-distribution-in-turing/67831)

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**Author:** [@robertdj](https://discourse.julialang.org/u/robertdj)\
**Replies:** 0\
**Last updated:** [September 7, 2021, 8:00pm UTC](https://discourse.julialang.org/t/normal-inverse-gaussian-distribution-in-turing/67831 "2021-09-07T20:00:26Z")

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I’m trying to use Turing to do inference for a Normal-Inverse-Gaussian (NIG) distribution, but I have two problems: I can only make the inference work for certain realizations. The parameter restriction feels clumsy. M…

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## [Parametric surface plots with Makie](https://discourse.julialang.org/t/parametric-surface-plots-with-makie/67685)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 6\
**Last updated:** [September 7, 2021, 7:26pm UTC](https://discourse.julialang.org/t/parametric-surface-plots-with-makie/67685 "2021-09-07T19:26:11Z")

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I am a new user of Makie. How can I make a parametric plot of a surface in 3-dimensions with Makie? For example, I am looking for something like this: ParametricPlot3D—Wolfram Language Documentation Is there a similar…

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## [Huge jump in version numbers for coin-or binary dependencies](https://discourse.julialang.org/t/huge-jump-in-version-numbers-for-coin-or-binary-dependencies/67825)

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**Author:** [@ianfiske](https://discourse.julialang.org/u/ianfiske)\
**Replies:** 2\
**Last updated:** [September 7, 2021, 6:58pm UTC](https://discourse.julialang.org/t/huge-jump-in-version-numbers-for-coin-or-binary-dependencies/67825 "2021-09-07T18:58:42Z")

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After my most recent \] up, I saw \[38041ee0\] ↑ Cbc\_jll v2.10.3+5 ⇒ v200.1000.500+1 \[3830e938\] ↑ Cgl\_jll v0.60.2+6 ⇒ v0.6000.200+0 \[06985876\] ↑ Clp\_jll v1.17.6+7 ⇒ v100.1700.600+0 Did something go wrong in the buil…

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## [DataFrame select, un-nesting a column containing tuples into three columns](https://discourse.julialang.org/t/dataframe-select-un-nesting-a-column-containing-tuples-into-three-columns/67726)

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**Author:** [@marcello](https://discourse.julialang.org/u/marcello)\
**Replies:** 2\
**Last updated:** [September 7, 2021, 6:02pm UTC](https://discourse.julialang.org/t/dataframe-select-un-nesting-a-column-containing-tuples-into-three-columns/67726 "2021-09-07T18:02:46Z")

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Hello, I’ve been following the JuliaCon 2021 tutorial on DataFrames https://github.com/bkamins/JuliaCon2021-DataFrames-Tutorial I’m using Julia 1.6.2 on VSCodium after exporting the Tutorial.ipynb into tutorial.js Th…

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## [Statistics in Julia good enough for my course?](https://discourse.julialang.org/t/statistics-in-julia-good-enough-for-my-course/67409)

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**Author:** [@TheLateKronos](https://discourse.julialang.org/u/TheLateKronos)\
**Replies:** 15\
**Last updated:** [September 7, 2021, 2:51pm UTC](https://discourse.julialang.org/t/statistics-in-julia-good-enough-for-my-course/67409 "2021-09-07T14:51:30Z")

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I am starting a Statistics course tomorrow, as an undergrad. While prepping for class, I met the following statement: The faculty I am in at my school swears to MatLab for most things, and I have followed courses on …

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## [ChainRulesCore: Custom adjoint ignored in certain cases](https://discourse.julialang.org/t/chainrulescore-custom-adjoint-ignored-in-certain-cases/67814)

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**Author:** [@Rasmus\_Hoier](https://discourse.julialang.org/u/Rasmus_Hoier)\
**Replies:** 3\
**Last updated:** [September 7, 2021, 2:32pm UTC](https://discourse.julialang.org/t/chainrulescore-custom-adjoint-ignored-in-certain-cases/67814 "2021-09-07T14:32:10Z")

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Hi, A colleague of mine ran into the issue that custom adjoints get ignored in certain cases in recent versions of ChainRulesCore. Here is a minimal working example: using Flux, ChainRulesCore my\_fun(x) = x\*x …

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## [Convexifying a 6-dimensional closed trajectory with \`LazySets.jl\`](https://discourse.julialang.org/t/convexifying-a-6-dimensional-closed-trajectory-with-lazysets-jl/67764)

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**Author:** [@cadojo](https://discourse.julialang.org/u/cadojo)\
**Replies:** 2\
**Last updated:** [September 7, 2021, 11:01am UTC](https://discourse.julialang.org/t/convexifying-a-6-dimensional-closed-trajectory-with-lazysets-jl/67764 "2021-09-07T11:01:35Z")

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First off, if anyone knows how to change the tag reachability-analysi to reachability-analysis, please do so! Discourse won’t let me type reachability-analysis in the category because a previous tag with an incorrect spe…

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## [Eigen not working for arbitrary precision BigFloat](https://discourse.julialang.org/t/eigen-not-working-for-arbitrary-precision-bigfloat/67686)

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**Author:** [@ekiral](https://discourse.julialang.org/u/ekiral)\
**Replies:** 16\
**Last updated:** [September 7, 2021, 11:11am UTC](https://discourse.julialang.org/t/eigen-not-working-for-arbitrary-precision-bigfloat/67686 "2021-09-07T11:11:51Z")

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I try to use the function eigen defined on a matrix with BigFloat entries. The method does not work. julia\> matrix = \[BigFloat(2) BigFloat(3); BigFloat(3), BigFloat(2)\] julia\> matrix 2x2 Matrix{BigFloat}: 2.0 3.0 …

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## [System data in different formats in PowerModels.jl](https://discourse.julialang.org/t/system-data-in-different-formats-in-powermodels-jl/67344)

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**Author:** [@Mariana](https://discourse.julialang.org/u/Mariana)\
**Replies:** 2\
**Last updated:** [September 7, 2021, 9:14am UTC](https://discourse.julialang.org/t/system-data-in-different-formats-in-powermodels-jl/67344 "2021-09-07T09:14:56Z")

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Hello. I’m using PowerModels.jl to study different power flow methods. However, for a specific system that I’m studying, I don’t have all the data in a single file. Also, the system’s data files I have are in different …

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## [How to "label" DataFrame categorical column?](https://discourse.julialang.org/t/how-to-label-dataframe-categorical-column/67790)

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**Author:** [@amrods](https://discourse.julialang.org/u/amrods)\
**Replies:** 1\
**Last updated:** [September 7, 2021, 7:35am UTC](https://discourse.julialang.org/t/how-to-label-dataframe-categorical-column/67790 "2021-09-07T07:35:01Z")

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How can I rename the levels of a categorical column in a DataFrame? I tried this but it throws an error: using DataFrames using CategoricalArrays df = DataFrame(x=\[1, 2, 3\]) df.x = categorical(df.x) levels!(df.x, \["one…

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## [Two questions about GLM](https://discourse.julialang.org/t/two-questions-about-glm/10376)

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**Author:** [@mwsohn](https://discourse.julialang.org/u/mwsohn)\
**Replies:** 4\
**Last updated:** [September 7, 2021, 5:55am UTC](https://discourse.julialang.org/t/two-questions-about-glm/10376 "2021-09-07T05:55:59Z")

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I have noticed that I could not use a CategoricalArray as the dependent variable for a logistic regression. When I convert the binary dependent variable into a Float64, then I can estimate the model without any problem. …

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## [Setting parameters for \`ReachabilityAnalysis\`'s \`@ivp\`](https://discourse.julialang.org/t/setting-parameters-for-reachabilityanalysis-s-ivp/67776)

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**Author:** [@cadojo](https://discourse.julialang.org/u/cadojo)\
**Replies:** 1\
**Last updated:** [September 7, 2021, 12:53am UTC](https://discourse.julialang.org/t/setting-parameters-for-reachabilityanalysis-s-ivp/67776 "2021-09-07T00:53:54Z")

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I see in documentation for ReachabilityAnalysis that parameters are typically set in a function, as is the case in the duffing oscillator example. I’m working with a system where the ODEFunction was automatically generat…

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## [Simulating evolutionary birth-death processes with EvoId.jl](https://discourse.julialang.org/t/simulating-evolutionary-birth-death-processes-with-evoid-jl/65867)

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**Author:** [@boutor2](https://discourse.julialang.org/u/boutor2)\
**Replies:** 1\
**Last updated:** [September 6, 2021, 7:47pm UTC](https://discourse.julialang.org/t/simulating-evolutionary-birth-death-processes-with-evoid-jl/65867 "2021-09-06T19:47:05Z")

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Hello guys, I am posting here a link to EvoId.jl, a package that I have been developing for my research. EvoId.jl is purposed for numerical experiments in theoretical evolutionary biology, and implements a few algorithm…

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## [Trying to understand 3d indexing](https://discourse.julialang.org/t/trying-to-understand-3d-indexing/67525)

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**Author:** [@Jakub\_Mitura](https://discourse.julialang.org/u/Jakub_Mitura)\
**Replies:** 3\
**Last updated:** [September 6, 2021, 9:51am UTC](https://discourse.julialang.org/t/trying-to-understand-3d-indexing/67525 "2021-09-06T09:51:53Z")

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I prepared kernel with thread dimensions 4, 4,1 and iterating over array of dimensionality 16,16,2 and 32 blocks as far as my calculations all should work - all divides without remainder but I get constantly ERROR: Ou…

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## [Laplace equation in one dimension](https://discourse.julialang.org/t/laplace-equation-in-one-dimension/67715)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 5\
**Last updated:** [September 6, 2021, 2:25am UTC](https://discourse.julialang.org/t/laplace-equation-in-one-dimension/67715 "2021-09-06T02:25:55Z")

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Please solve the Laplace equation in one dimension on a region bounded between x ∈ \[0, 1\], with the boundary condition Φ(0) = 1, and Φ(1) = 2. Actually line should pass through (0,1) making 45 degree with x,y-axis.

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## [Getting strange "UndefVarError: xs not defined" in Zygote / Flux](https://discourse.julialang.org/t/getting-strange-undefvarerror-xs-not-defined-in-zygote-flux/67707)

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**Author:** [@outlace](https://discourse.julialang.org/u/outlace)\
**Replies:** 3\
**Last updated:** [September 5, 2021, 10:18pm UTC](https://discourse.julialang.org/t/getting-strange-undefvarerror-xs-not-defined-in-zygote-flux/67707 "2021-09-05T22:18:41Z")

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I’ve got a fairly simple custom 2-layer MLP implementation but I get this strange error when trying to get the gradient: LoadError: UndefVarError: xs not defined UndefVarError: xs not defined Here’s my full code using…

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## [Subsetting boolean columns and multiple assignments](https://discourse.julialang.org/t/subsetting-boolean-columns-and-multiple-assignments/67716)

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**Author:** [@jacobusmmsmit](https://discourse.julialang.org/u/jacobusmmsmit)\
**Replies:** 5\
**Last updated:** [September 5, 2021, 8:37pm UTC](https://discourse.julialang.org/t/subsetting-boolean-columns-and-multiple-assignments/67716 "2021-09-05T20:37:54Z")

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Hello, I have two related questions both related to the following code: df = DataFrame(a = \[true, true, false\]) subset1 = subset(df, :a) subset2 = subset(df, :a =\> ByRow(!=(true))) I want to be able to do something lik…

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## [Makie animation: type FigureAxisPlot has no field plots](https://discourse.julialang.org/t/makie-animation-type-figureaxisplot-has-no-field-plots/67696)

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**Author:** [@GoH](https://discourse.julialang.org/u/GoH)\
**Replies:** 2\
**Last updated:** [September 5, 2021, 8:35am UTC](https://discourse.julialang.org/t/makie-animation-type-figureaxisplot-has-no-field-plots/67696 "2021-09-05T08:35:38Z")

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Hi i am trying to run the example code in http://juliaplots.org/MakieGallery.jl/stable/animation.html, but got an error of type FigureAxisPlot has no field plots getproperty(::Makie.FigureAxisPlot, ::Symbol)@Base.jl:33…

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## [Will Flux/Zygote compute gradients sparsely?](https://discourse.julialang.org/t/will-flux-zygote-compute-gradients-sparsely/67542)

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**Author:** [@outlace](https://discourse.julialang.org/u/outlace)\
**Replies:** 7\
**Last updated:** [September 4, 2021, 10:30pm UTC](https://discourse.julialang.org/t/will-flux-zygote-compute-gradients-sparsely/67542 "2021-09-04T22:30:03Z")

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So in short I want to train an MLP by sparsely updating it’s parameters. I do this on the forward pass by randomly subsampling the columns of my parameter matrices. E.g. for a simple 2 layer model on MINST with input dat…

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## [Examples of analysis that can be done with SatelliteToolbox.jl](https://discourse.julialang.org/t/examples-of-analysis-that-can-be-done-with-satellitetoolbox-jl/19330)

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**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 28\
**Last updated:** [September 4, 2021, 8:34pm UTC](https://discourse.julialang.org/t/examples-of-analysis-that-can-be-done-with-satellitetoolbox-jl/19330 "2021-09-04T20:34:58Z")

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Hi guys! Just to let you know that I added to my blog a introductory post about the SatelliteToolbox.jl package: https://ronanarraes.com/tutorials/julia/the-satellitetoolbox-for-julia/ I also provided two examples of a…

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## [Specify the admissible region of SIS model when plotting its phase portrait, using streamplot](https://discourse.julialang.org/t/specify-the-admissible-region-of-sis-model-when-plotting-its-phase-portrait-using-streamplot/67688)

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**Author:** [@GoH](https://discourse.julialang.org/u/GoH)\
**Replies:** 4\
**Last updated:** [September 4, 2021, 2:43pm UTC](https://discourse.julialang.org/t/specify-the-admissible-region-of-sis-model-when-plotting-its-phase-portrait-using-streamplot/67688 "2021-09-04T14:43:05Z")

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Hi I am trying to visualize the phase space of SIS model, but here is what I obtained. The problem is the trajectories should on the line of S+I=1, but somehow they did not, in the plot. here is my code begin using…

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## [What is the difference btween handling f\[i,j\]=GridLayout() and g=f\[i,j\]=GridLayout()](https://discourse.julialang.org/t/what-is-the-difference-btween-handling-f-i-j-gridlayout-and-g-f-i-j-gridlayout/67675)

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**Author:** [@thudjx](https://discourse.julialang.org/u/thudjx)\
**Replies:** 7\
**Last updated:** [September 4, 2021, 1:37pm UTC](https://discourse.julialang.org/t/what-is-the-difference-btween-handling-f-i-j-gridlayout-and-g-f-i-j-gridlayout/67675 "2021-09-04T13:37:46Z")

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I am trying to plot a 2x2 figure as shown below. So I import CairoMakie for ir in 1:2, ic in 1:2 g = f\[ir,ic\] = GridLayout() # handling g below end But if I try the following code: for ir in 1:2, ic in 1:…

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