# Latest

**URL:** https://discourse.julialang.org/latest.md?page=716

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

**Page:** 717

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## [What causes the Distributed.ProcessExitedException(3) error in Julia and how can I resolve it in my Pluto notebook?](https://discourse.julialang.org/t/what-causes-the-distributed-processexitedexception-3-error-in-julia-and-how-can-i-resolve-it-in-my-pluto-notebook/97790)

<div class="topic-metadata">

**Author:** [@kondjenim](https://discourse.julialang.org/u/kondjenim)\
**Replies:** 4\
**Last updated:** [April 27, 2023, 4:02pm UTC](https://discourse.julialang.org/t/what-causes-the-distributed-processexitedexception-3-error-in-julia-and-how-can-i-resolve-it-in-my-pluto-notebook/97790 "2023-04-27T16:02:26Z")

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I am encountering the Distributed.ProcessExitedException(3) error in my Julia Pluto notebook. I am not sure what is causing this error or how to resolve it. I have tried updating Julia and the Pluto package, as well as r…

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## [Stacked environments](https://discourse.julialang.org/t/stacked-environments/97955)

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**Author:** [@airpmb](https://discourse.julialang.org/u/airpmb)\
**Replies:** 2\
**Last updated:** [April 27, 2023, 3:12pm UTC](https://discourse.julialang.org/t/stacked-environments/97955 "2023-04-27T15:12:11Z")

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I’d like to start making better use of stacked environments and have a few questions. If I’m not mistaken the only sanctioned way to add another stacked environment is by modifying LOAD\_PATH, e.g. push!(LOAD\_PATH, "@mye…

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## [Performance of Interpolations in Modeling toolkit](https://discourse.julialang.org/t/performance-of-interpolations-in-modeling-toolkit/97997)

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**Author:** [@HamzaKh99](https://discourse.julialang.org/u/HamzaKh99)\
**Replies:** 1\
**Last updated:** [April 27, 2023, 2:51pm UTC](https://discourse.julialang.org/t/performance-of-interpolations-in-modeling-toolkit/97997 "2023-04-27T14:51:51Z")

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Hello, I’m trying to create a lookup table function in modeling toolkit, for that I used Interpolations.jl to make an interpolation between elements of a table, my code is working perfectly fine but the problem is in th…

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## [Is dso\_local set in LLVM IR output?](https://discourse.julialang.org/t/is-dso-local-set-in-llvm-ir-output/52707)

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**Author:** [@MaskRay](https://discourse.julialang.org/u/MaskRay)\
**Replies:** 1\
**Last updated:** [April 27, 2023, 2:35pm UTC](https://discourse.julialang.org/t/is-dso-local-set-in-llvm-ir-output/52707 "2023-04-27T14:35:35Z")

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https://github.com/llvm/llvm-project/commit/2047c10c22b071cccc57a7e2779d6603512e9113 was to clean up llvm::TargetMachine::shouldAssumeDSOLocal. For Clang, that code is unneeded because Clang sets dso\_local https://github…

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## [Do Garbage Collectors necessarily make code slow?](https://discourse.julialang.org/t/do-garbage-collectors-necessarily-make-code-slow/97902)

<div class="topic-metadata">

**Author:** [@FrancisKing](https://discourse.julialang.org/u/FrancisKing)\
**Replies:** 22\
**Last updated:** [April 27, 2023, 2:19pm UTC](https://discourse.julialang.org/t/do-garbage-collectors-necessarily-make-code-slow/97902 "2023-04-27T14:19:14Z")

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A more serious question, while you’re around, is to ask you why C# is generally reckoned to be slower than C++, “because it has garbage collection”. In another thread you opined that garbage collectors don’t necessarily …

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## [Passing array as parameter to a PDESystem](https://discourse.julialang.org/t/passing-array-as-parameter-to-a-pdesystem/97407)

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**Author:** [@Mixpap](https://discourse.julialang.org/u/Mixpap)\
**Replies:** 12\
**Last updated:** [April 27, 2023, 12:08pm UTC](https://discourse.julialang.org/t/passing-array-as-parameter-to-a-pdesystem/97407 "2023-04-27T12:08:41Z")

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Hello, I am trying to solve an inverse diffusion+source problem based on some data on the surface of a cylinder. I already tried several PINN implementations I have used before but with no luck. What I am trying to do i…

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## [Improve type inference in iterating over \`Eigen\`](https://discourse.julialang.org/t/improve-type-inference-in-iterating-over-eigen/97987)

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**Author:** [@jishnub](https://discourse.julialang.org/u/jishnub)\
**Replies:** 5\
**Last updated:** [April 27, 2023, 11:26am UTC](https://discourse.julialang.org/t/improve-type-inference-in-iterating-over-eigen/97987 "2023-04-27T11:26:15Z")

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In the following example: julia\> @code\_warntype (A -\> ((λ,v) = eigen(A); (λ,v)))(rand(2,2)) MethodInstance for (::var"#19#20")(::Matrix{Float64}) from (::var"#19#20")(A) @ Main REPL\[14\]:1 Arguments #self#::Core.Cons…

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## [Monotone cubic spline interpolation on an irregular grid](https://discourse.julialang.org/t/monotone-cubic-spline-interpolation-on-an-irregular-grid/97977)

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**Author:** [@zdenek\_hurak](https://discourse.julialang.org/u/zdenek_hurak)\
**Replies:** 2\
**Last updated:** [April 27, 2023, 10:45am UTC](https://discourse.julialang.org/t/monotone-cubic-spline-interpolation-on-an-irregular-grid/97977 "2023-04-27T10:45:49Z")

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Is there a package in Julia for interpolation using a monotone cubic spline interpolation on an irregular grid? I seem to be failing to find one. Interpolations.jl does provide monotone option, but only on a regular gri…

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## [Static testing with JET vs interfaces](https://discourse.julialang.org/t/static-testing-with-jet-vs-interfaces/97985)

<div class="topic-metadata">

**Author:** [@gdalle](https://discourse.julialang.org/u/gdalle)\
**Replies:** 5\
**Last updated:** [April 27, 2023, 9:47am UTC](https://discourse.julialang.org/t/static-testing-with-jet-vs-interfaces/97985 "2023-04-27T09:47:51Z")

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Hi there! I’m starting to add JET testing to several packages, but I run into problems when I try to define abstract interfaces. As of right now, interfaces in Julia are mostly methodless functions with explicit documen…

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## [PackageCompiler - reduce system image](https://discourse.julialang.org/t/packagecompiler-reduce-system-image/97952)

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**Author:** [@gitboy16](https://discourse.julialang.org/u/gitboy16)\
**Replies:** 5\
**Last updated:** [April 27, 2023, 8:29am UTC](https://discourse.julialang.org/t/packagecompiler-reduce-system-image/97952 "2023-04-27T08:29:46Z")

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Hi, I was looking at the doc of PackageCompiler but couldn’t find the information I was looking for. Is there options to strip metadata, ir, documentation, some standard libraries…etc from the system image when buildin…

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## [Plotting Polygons in geomakie](https://discourse.julialang.org/t/plotting-polygons-in-geomakie/97948)

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**Author:** [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)\
**Replies:** 2\
**Last updated:** [April 27, 2023, 7:33am UTC](https://discourse.julialang.org/t/plotting-polygons-in-geomakie/97948 "2023-04-27T07:33:46Z")

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Hello, I’m trying to make map of administrative regions in GeoMakie but the poly! function does not work with Polygons, unlike specified in the documentation (poly · Makie). Here’s a MWE: GeoJSON.write("data/DE\_regions.…

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## [Simulating a dynamic satellite constellation network using SatelliteToolbox.jl](https://discourse.julialang.org/t/simulating-a-dynamic-satellite-constellation-network-using-satellitetoolbox-jl/97979)

<div class="topic-metadata">

**Author:** [@rafiulnakib](https://discourse.julialang.org/u/rafiulnakib)\
**Replies:** 1\
**Last updated:** [April 27, 2023, 6:20am UTC](https://discourse.julialang.org/t/simulating-a-dynamic-satellite-constellation-network-using-satellitetoolbox-jl/97979 "2023-04-27T06:20:43Z")

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Hi everyone, I am trying to simulate a dynamic satellite constellation network using SatelliteToolbox. The goal is to use this network and integrate it with the QuNet package for benchmarking and performance analysis as…

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## [Pluto misses cell update](https://discourse.julialang.org/t/pluto-misses-cell-update/96062)

<div class="topic-metadata">

**Author:** [@DOT](https://discourse.julialang.org/u/DOT)\
**Replies:** 2\
**Last updated:** [April 27, 2023, 6:08am UTC](https://discourse.julialang.org/t/pluto-misses-cell-update/96062 "2023-04-27T06:08:07Z")

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In callable parameterized types, Pluto seems to miss when the cell defining the function is changed: Near the comment, if, e.g., I push @show :stuff into the next line, without #, and then run that cell, the final ce…

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## ["type definition not allowed inside a local scope"](https://discourse.julialang.org/t/type-definition-not-allowed-inside-a-local-scope/3907)

<div class="topic-metadata">

**Author:** [@Dandan](https://discourse.julialang.org/u/Dandan)\
**Replies:** 20\
**Last updated:** [April 27, 2023, 3:24am UTC](https://discourse.julialang.org/t/type-definition-not-allowed-inside-a-local-scope/3907 "2023-04-27T03:24:39Z")

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Hi. Julia tells me that “type definition not allowed inside a local scope”. I have a simple question - why? :slight\_smile:

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## [Tagging values unique to a group in a dataframe](https://discourse.julialang.org/t/tagging-values-unique-to-a-group-in-a-dataframe/97967)

<div class="topic-metadata">

**Author:** [@George9000](https://discourse.julialang.org/u/George9000)\
**Replies:** 2\
**Last updated:** [April 27, 2023, 1:59am UTC](https://discourse.julialang.org/t/tagging-values-unique-to-a-group-in-a-dataframe/97967 "2023-04-27T01:59:12Z")

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Say that I have a dataframe: function exampl() grp = Int8\[\] for i in 1:5 grp = append!(grp, fill(i, 7)) end values = Int8\[\] for i in 1:7 values = append!(values, rand(1:15, 5)) e…

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## [Error with dependency of NetworkDynamics.jl. What to do?](https://discourse.julialang.org/t/error-with-dependency-of-networkdynamics-jl-what-to-do/97978)

<div class="topic-metadata">

**Author:** [@bryaan](https://discourse.julialang.org/u/bryaan)\
**Replies:** 0\
**Last updated:** [April 27, 2023, 12:55am UTC](https://discourse.julialang.org/t/error-with-dependency-of-networkdynamics-jl-what-to-do/97978 "2023-04-27T00:55:09Z")

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I am trying to run this BlockSystems.jl example but I’m getting an issue with what seems like a dependency of NetworkDynamics.jl. LoadError: UndefVarError: AllObserved not defined in expression starting at /Users/bry…

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## [Naming constraints error](https://discourse.julialang.org/t/naming-constraints-error/97959)

<div class="topic-metadata">

**Author:** [@irene\_ub](https://discourse.julialang.org/u/irene_ub)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 10:57pm UTC](https://discourse.julialang.org/t/naming-constraints-error/97959 "2023-04-26T22:57:36Z")

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Hello, I have an optimization model, for which I’m trying to give names to its constraints so that I can write them to an lp file and find them easily. However, I’m having some trouble. The constraint specifically that…

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## [COUENNE with Julia](https://discourse.julialang.org/t/couenne-with-julia/43216)

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**Author:** [@mayar](https://discourse.julialang.org/u/mayar)\
**Replies:** 47\
**Last updated:** [April 26, 2023, 10:43pm UTC](https://discourse.julialang.org/t/couenne-with-julia/43216 "2023-04-26T22:43:40Z")

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hello there, I am trying to install and use Couenne on Windows 10 so I can use it in my Julia program, Does anyone has experience with installing solvers. It is my first time to do something like that. What I understand…

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## [How to change a public interface](https://discourse.julialang.org/t/how-to-change-a-public-interface/97958)

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**Author:** [@Lilith](https://discourse.julialang.org/u/Lilith)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 9:49pm UTC](https://discourse.julialang.org/t/how-to-change-a-public-interface/97958 "2023-04-26T21:49:05Z")

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Let’s say I have a package that defines an abstract type with an interface: if you define successor\_is\_prime, then my module will define predecessor\_is\_prime. module Arithmetic function successor\_is\_prime end pr…

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## [Plots adjust the subtitle position](https://discourse.julialang.org/t/plots-adjust-the-subtitle-position/97971)

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**Author:** [@jianqixi](https://discourse.julialang.org/u/jianqixi)\
**Replies:** 0\
**Last updated:** [April 26, 2023, 9:44pm UTC](https://discourse.julialang.org/t/plots-adjust-the-subtitle-position/97971 "2023-04-26T21:44:32Z")

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Hi I am trying to plot some subplots with title or label. I tried to use label which was assumed to be appeared within the plot, but it didn’t. Then I tried to use title, it works now, but the position of those subtitle …

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## [What is the point of the Symmetric type?](https://discourse.julialang.org/t/what-is-the-point-of-the-symmetric-type/40773)

<div class="topic-metadata">

**Author:** [@Grayscale](https://discourse.julialang.org/u/Grayscale)\
**Replies:** 19\
**Last updated:** [April 26, 2023, 9:37pm UTC](https://discourse.julialang.org/t/what-is-the-point-of-the-symmetric-type/40773 "2023-04-26T21:37:56Z")

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Cross-posting this question at the suggestion of a commenter: https://stackoverflow.com/questions/62058109/what-is-the-point-of-the-symmetric-type-in-julia

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## [Transforming a Pluto notebook into a Julia package](https://discourse.julialang.org/t/transforming-a-pluto-notebook-into-a-julia-package/60789)

<div class="topic-metadata">

**Author:** [@Mark\_Nahabedian](https://discourse.julialang.org/u/Mark_Nahabedian)\
**Replies:** 15\
**Last updated:** [April 26, 2023, 9:11pm UTC](https://discourse.julialang.org/t/transforming-a-pluto-notebook-into-a-julia-package/60789 "2023-04-26T21:11:29Z")

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I’ve been using a Pluto notebook as an IDE. It’s been pretty handy being able to try things out, change definitions and try again. Once my code is “done” though, I’d like to be able to turn it into a module/package wit…

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## [Optimizing performance with FASTX I/O stream and Codon Counting](https://discourse.julialang.org/t/optimizing-performance-with-fastx-i-o-stream-and-codon-counting/97918)

<div class="topic-metadata">

**Author:** [@gus-pendleton](https://discourse.julialang.org/u/gus-pendleton)\
**Replies:** 5\
**Last updated:** [April 26, 2023, 8:05pm UTC](https://discourse.julialang.org/t/optimizing-performance-with-fastx-i-o-stream-and-codon-counting/97918 "2023-04-26T20:05:38Z")

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Hello, I am working to write code for codon usage bias, and my slowest step by far is calculating counts of individual codons for each gene in a fasta sequence of a genome. The general idea is that I’m using FASTX to s…

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## [Error when adding CairoMakie in a fresh temporary environment](https://discourse.julialang.org/t/error-when-adding-cairomakie-in-a-fresh-temporary-environment/97962)

<div class="topic-metadata">

**Author:** [@martinmestre](https://discourse.julialang.org/u/martinmestre)\
**Replies:** 1\
**Last updated:** [April 26, 2023, 7:18pm UTC](https://discourse.julialang.org/t/error-when-adding-cairomakie-in-a-fresh-temporary-environment/97962 "2023-04-26T19:18:56Z")

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Hi, this is the full output: (jl\_iJ7m9n) pkg\> add CairoMakie Resolving package versions... Updating \`/tmp/jl\_iJ7m9n/Project.toml\` \[13f3f980\] + CairoMakie v0.10.4 Updating \`/tmp/jl\_iJ7m9n/Manifest.toml\` \[6…

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## [\[ANN\] New package FinitePosets](https://discourse.julialang.org/t/ann-new-package-finiteposets/96707)

<div class="topic-metadata">

**Author:** [@Jean\_Michel](https://discourse.julialang.org/u/Jean_Michel)\
**Replies:** 0\
**Last updated:** [March 28, 2023, 11:44am UTC](https://discourse.julialang.org/t/ann-new-package-finiteposets/96707 "2023-03-28T11:44:31Z")

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This new (registered) package is at FinitePosets. Here is the README “”" This package deals with finite posets. There are two types of posets. A “canonical poset” or CPoset is on the elements 1:n where n=leng…

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## [\[ANN\] Attractors.jl](https://discourse.julialang.org/t/ann-attractors-jl/97961)

<div class="topic-metadata">

**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 0\
**Last updated:** [April 26, 2023, 6:21pm UTC](https://discourse.julialang.org/t/ann-attractors-jl/97961 "2023-04-26T18:21:49Z")

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Hello people, I am super proud to announce Attractors.jl and the publication that accompanies the bulk of the package, which just appeared on arXiv. As eluded to in the DynamicalSystems.jl v3 announcement, Attractors.jl…

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## [Plot images within a loop](https://discourse.julialang.org/t/plot-images-within-a-loop/97960)

<div class="topic-metadata">

**Author:** [@jianqixi](https://discourse.julialang.org/u/jianqixi)\
**Replies:** 5\
**Last updated:** [April 26, 2023, 6:13pm UTC](https://discourse.julialang.org/t/plot-images-within-a-loop/97960 "2023-04-26T18:13:28Z")

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I am trying to plot some data within one loop using the following code: n=length(B) for i in 1:n i=contourf(x,y,B\[i\], layout=n) display(i) end Here B is a matrix and each B\[i\] is one array. When using the above cod…

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## [Pre-allocating arrays for parallel multiple shooting Neural ODE training in Flux](https://discourse.julialang.org/t/pre-allocating-arrays-for-parallel-multiple-shooting-neural-ode-training-in-flux/97867)

<div class="topic-metadata">

**Author:** [@linkz](https://discourse.julialang.org/u/linkz)\
**Replies:** 1\
**Last updated:** [April 24, 2023, 5:30pm UTC](https://discourse.julialang.org/t/pre-allocating-arrays-for-parallel-multiple-shooting-neural-ode-training-in-flux/97867 "2023-04-24T17:30:39Z")

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Hi, I would like to pre-allocate an array of matrices which I would then in-place mutate in my multiple shooting training in Flux, optimized via Optimization (see skeleton code below). However, I don’t know what type sho…

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## [Outer Product of SparseMatrix and SparseVector](https://discourse.julialang.org/t/outer-product-of-sparsematrix-and-sparsevector/97947)

<div class="topic-metadata">

**Author:** [@ejmeitz](https://discourse.julialang.org/u/ejmeitz)\
**Replies:** 5\
**Last updated:** [April 26, 2023, 4:08pm UTC](https://discourse.julialang.org/t/outer-product-of-sparsematrix-and-sparsevector/97947 "2023-04-26T16:08:19Z")

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Is there an elegant/optimized way to take the outer product of 3 sparse vectors? Problem 1: Triple Outer Product In numpy I can just chain calls to np.outer(np.outer(v,v),v) but I cannot do the same in Julia. I see th…

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## [JuliaCon 2023 Workshops Announced!](https://discourse.julialang.org/t/juliacon-2023-workshops-announced/96567)

<div class="topic-metadata">

**Author:** [@logankilpatrick](https://discourse.julialang.org/u/logankilpatrick)\
**Replies:** 4\
**Last updated:** [April 20, 2023, 9:01pm UTC](https://discourse.julialang.org/t/juliacon-2023-workshops-announced/96567 "2023-04-20T21:01:38Z")

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Hey all! We recently announced the workshops for JuliaCon 2023: https://pretalx.com/juliacon2023/featured/ If you are planning to attend in person, please fill out this form so we can make sure to get the right sized ro…

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