# Latest

**URL:** https://discourse.julialang.org/latest.md?page=104

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

**Page:** 105

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## [Filtering dataframe row by row procedurally?](https://discourse.julialang.org/t/filtering-dataframe-row-by-row-procedurally/132745)

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**Author:** [@Quantodeluz](https://discourse.julialang.org/u/Quantodeluz)\
**Replies:** 2\
**Last updated:** [September 29, 2025, 1:29pm UTC](https://discourse.julialang.org/t/filtering-dataframe-row-by-row-procedurally/132745 "2025-09-29T13:29:31Z")

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Suppose i have a dataframe which i want to filter using, let’s say, interquartile range, and i want to do it for each column (so if one element is filtered out it’s whole row is filteed out with it), but i don’t know whi…

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## [Solving a non-linear P(I)DE - neural field equation](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-neural-field-equation/132678)

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**Author:** [@jucheval](https://discourse.julialang.org/u/jucheval)\
**Replies:** 3\
**Last updated:** [September 29, 2025, 8:53am UTC](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-neural-field-equation/132678 "2025-09-29T08:53:16Z")

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Hi everyone ! I am searching for some way to solve the following non linear P(I)DE, known as the neural field equation: \\frac{\\partial}{\\partial\_t} u(t,x) = -\\alpha u(t,x) + \\int w(y,x) f(u(t,y)) dy, for some scalar \\…

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## [Solving a non-linear P(I)DE - age-structured equation](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-age-structured-equation/132677)

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**Author:** [@jucheval](https://discourse.julialang.org/u/jucheval)\
**Replies:** 5\
**Last updated:** [September 29, 2025, 8:51am UTC](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-age-structured-equation/132677 "2025-09-29T08:51:02Z")

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Hi everyone ! I am searching for some way to solve the following non-linear P(I)DE, known as the refractory density equation or age-structured equation: \\begin{cases} \\frac{\\partial}{\\partial\_t} u(t,a) + \\frac{\\pa…

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## [Using CSS and JS function defined in Julia module for Pluto](https://discourse.julialang.org/t/using-css-and-js-function-defined-in-julia-module-for-pluto/132455)

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**Author:** [@dmetivie](https://discourse.julialang.org/u/dmetivie)\
**Replies:** 2\
**Last updated:** [September 29, 2025, 7:36am UTC](https://discourse.julialang.org/t/using-css-and-js-function-defined-in-julia-module-for-pluto/132455 "2025-09-29T07:36:30Z")

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I am creating a Julia package PlutoXXX.jl with some CSS and JS code. I want when checking a checkbox inside the Pluto notebook to activate the CSS and calling the JS function defined inside my module to activate a mode …

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## [Installation Issue of Python Package using CondaPkg.jl](https://discourse.julialang.org/t/installation-issue-of-python-package-using-condapkg-jl/132504)

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**Author:** [@Jiongci](https://discourse.julialang.org/u/Jiongci)\
**Replies:** 10\
**Last updated:** [September 29, 2025, 3:11am UTC](https://discourse.julialang.org/t/installation-issue-of-python-package-using-condapkg-jl/132504 "2025-09-29T03:11:59Z")

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Hello, I am recently using CondaPkg.jl to manage a conda environment in a Julia Package. However, when I tried CondaPkg.add\_pip(“fairchem-core”; version=“==2.6.0”) to install the latest Fairchem package, it failed and s…

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## [How to model an implication](https://discourse.julialang.org/t/how-to-model-an-implication/132617)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 24\
**Last updated:** [September 28, 2025, 9:17pm UTC](https://discourse.julialang.org/t/how-to-model-an-implication/132617 "2025-09-28T21:17:31Z")

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Suppose we have a two-dimensional binary variable x. Let, for example, be two-dimensional with n x m rows and columns. a) How can I express, in linear terms, a constraint of the following type? # sum(x\[1,:\])== 5 =\> su…

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## [Julia v1.12.0-rc3 is now available](https://discourse.julialang.org/t/julia-v1-12-0-rc3-is-now-available/132735)

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**Author:** [@ararslan](https://discourse.julialang.org/u/ararslan)\
**Replies:** 0\
**Last updated:** [September 28, 2025, 7:25pm UTC](https://discourse.julialang.org/t/julia-v1-12-0-rc3-is-now-available/132735 "2025-09-28T19:25:58Z")

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Julia version 1.12.0-rc3, the third release candidate for the upcoming 1.12 series of releases, is now available. Binaries are available via JuliaUp and in the upcoming release section of https://julialang.org/downloads/ …

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## [RecursiveArrayTools.VectorOfArray weirdness](https://discourse.julialang.org/t/recursivearraytools-vectorofarray-weirdness/132726)

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**Author:** [@rveltz](https://discourse.julialang.org/u/rveltz)\
**Replies:** 5\
**Last updated:** [September 28, 2025, 5:35pm UTC](https://discourse.julialang.org/t/recursivearraytools-vectorofarray-weirdness/132726 "2025-09-28T17:35:43Z")

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Hi, I stumbled onto the following weirdness, it seems norm(a,2) is computed in place of norm(a,Inf). julia\> using RecursiveArrayTools julia\> a = VectorOfArray(\[rand(10)\]) VectorOfArray{Float64,2}: 1-element Vector{Vec…

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## [MWE- Minimum Working Example steps guide](https://discourse.julialang.org/t/mwe-minimum-working-example-steps-guide/132733)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 1\
**Last updated:** [September 28, 2025, 4:10pm UTC](https://discourse.julialang.org/t/mwe-minimum-working-example-steps-guide/132733 "2025-09-28T16:10:00Z")

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Suggest steps to write Minimum Working Example. When we post an issue here on Discourse. Often helpers want MWE (minimum working example) that reproduces same error or results. For many of us writing a MWE is usually tou…

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## [Confusion about BioJulia site?](https://discourse.julialang.org/t/confusion-about-biojulia-site/132708)

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**Author:** [@Marco\_Antoniotti](https://discourse.julialang.org/u/Marco_Antoniotti)\
**Replies:** 2\
**Last updated:** [September 28, 2025, 9:08am UTC](https://discourse.julialang.org/t/confusion-about-biojulia-site/132708 "2025-09-28T09:08:23Z")

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Hi I am back to BioJulia and I see that the main indexed site appears to be https://biojulia.dev. Alas, that appears… old (2024). OTOH, there is a BioJulia Unified Docs which appears to be up to date. What gives? Al…

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## [\[ANN\] UnsupervisedClustering.jl, a unified interface for clustering with optimization techniques](https://discourse.julialang.org/t/ann-unsupervisedclustering-jl-a-unified-interface-for-clustering-with-optimization-techniques/132720)

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**Author:** [@raphasampaio](https://discourse.julialang.org/u/raphasampaio)\
**Replies:** 0\
**Last updated:** [September 27, 2025, 9:57pm UTC](https://discourse.julialang.org/t/ann-unsupervisedclustering-jl-a-unified-interface-for-clustering-with-optimization-techniques/132720 "2025-09-27T21:57:34Z")

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I’m happy to announce UnsupervisedClustering.jl, a Julia package that provides a consistent interface for unsupervised clustering algorithms, along with strategies to escape local optima and reduce overfitting. Unsuperv…

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## [Vectorization of "complex" loops](https://discourse.julialang.org/t/vectorization-of-complex-loops/132681)

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**Author:** [@eduardomartini](https://discourse.julialang.org/u/eduardomartini)\
**Replies:** 15\
**Last updated:** [September 27, 2025, 8:18pm UTC](https://discourse.julialang.org/t/vectorization-of-complex-loops/132681 "2025-09-27T20:18:51Z")

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Hi, First and foremost, thanks to everyone involved in advancing Julia. I recently started testing it out, and I am having lots of fun :slight\_smile:. I am not sure if this is the proper forum for this question, but sin…

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## [Fitting generates an extreme standard deviation (Dataframes + Easyfit)](https://discourse.julialang.org/t/fitting-generates-an-extreme-standard-deviation-dataframes-easyfit/132718)

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**Author:** [@Quantodeluz](https://discourse.julialang.org/u/Quantodeluz)\
**Replies:** 2\
**Last updated:** [September 27, 2025, 7:07pm UTC](https://discourse.julialang.org/t/fitting-generates-an-extreme-standard-deviation-dataframes-easyfit/132718 "2025-09-27T19:07:44Z")

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Hi, I am trying to fit some data with EasyFit.jl, but i get an unreasonable standard deviation. What could be the cause, and what could i do about it? -------------------- Linear Fit ------------------- Equation: y = a…

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## [Syntax of multiple let assignments vs tuples](https://discourse.julialang.org/t/syntax-of-multiple-let-assignments-vs-tuples/130357)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 10\
**Last updated:** [September 27, 2025, 2:38pm UTC](https://discourse.julialang.org/t/syntax-of-multiple-let-assignments-vs-tuples/130357 "2025-09-27T14:38:28Z")

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One question has been continually bothering me—why do we have this syntax let x = 1, y = 2? Since we used to write x, y = 1, 2 directly in julia REPL. Otherwise it’s invalid as follows julia\> x = 1, y = 2 ERROR: synta…

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## [How to use PythonCall with a previous Conda environment](https://discourse.julialang.org/t/how-to-use-pythoncall-with-a-previous-conda-environment/87419)

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**Author:** [@martinmestre](https://discourse.julialang.org/u/martinmestre)\
**Replies:** 9\
**Last updated:** [September 27, 2025, 2:35pm UTC](https://discourse.julialang.org/t/how-to-use-pythoncall-with-a-previous-conda-environment/87419 "2025-09-27T14:35:57Z")

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Hello, I would be very gratefull to understand what is the problem. I followed the instructions: julia \> ENV\["JULIA\_CONDAPKG\_BACKEND"\] = "System" julia \> ENV\["JULIA\_CONDAPKG\_EXE"\] = "/home/mmestre/.conda/envs/cosmos/bi…

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## [Local variable inside a loop: why it ERRORs](https://discourse.julialang.org/t/local-variable-inside-a-loop-why-it-errors/132501)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 14\
**Last updated:** [September 27, 2025, 12:30pm UTC](https://discourse.julialang.org/t/local-variable-inside-a-loop-why-it-errors/132501 "2025-09-27T12:30:41Z")

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Dear all: I wonder why is the UndefVarError, and, is the Suggestion accurate? julia\> function test(C) count = 1 v = Function\[\] while count \< C local item f…

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## [Pair of methods for symmetric operator by a single definition](https://discourse.julialang.org/t/pair-of-methods-for-symmetric-operator-by-a-single-definition/132696)

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**Author:** [@DanimirD](https://discourse.julialang.org/u/DanimirD)\
**Replies:** 2\
**Last updated:** [September 27, 2025, 11:41am UTC](https://discourse.julialang.org/t/pair-of-methods-for-symmetric-operator-by-a-single-definition/132696 "2025-09-27T11:41:06Z")

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Hi, I’ve been trying to familiarize myself with Julia lately and I finally stumbled upon a question to which I couldn’t find an answer yet, so I signed up to Discourse :slight\_smile: First of all, thanks to everyone who…

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## [Is there a functional substitute for JuMP.@variable?](https://discourse.julialang.org/t/is-there-a-functional-substitute-for-jump-variable/132669)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 7\
**Last updated:** [September 27, 2025, 1:17am UTC](https://discourse.julialang.org/t/is-there-a-functional-substitute-for-jump-variable/132669 "2025-09-27T01:17:52Z")

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I think there is a basic criterion: macros should yield to functions whenever possible I know it is necessary to have macros build expressions, e.g. JuMP.@expression(m, sum(c\[i\]x\[i\] for i = 1:I)) since the last arg …

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## [Finding all zeros of a univariate function on the real line](https://discourse.julialang.org/t/finding-all-zeros-of-a-univariate-function-on-the-real-line/132565)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 5\
**Last updated:** [September 26, 2025, 10:23pm UTC](https://discourse.julialang.org/t/finding-all-zeros-of-a-univariate-function-on-the-real-line/132565 "2025-09-26T22:23:51Z")

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I am trying to find all zeros of f(z) = C\_m + D\_m H(C\_f + D\_f H(z)) - z where C\_i, D\_i \\in \\mathbb{R} (can be any sign) and H is the CDF of the standard normal. If someone wants to experiment, this can be coded in Ju…

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## [Juliaup installer fails on AWS: "cannot open /dev/pts/1: Permission denied"](https://discourse.julialang.org/t/juliaup-installer-fails-on-aws-cannot-open-dev-pts-1-permission-denied/132685)

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**Author:** [@NonDairyNeutrino](https://discourse.julialang.org/u/NonDairyNeutrino)\
**Replies:** 3\
**Last updated:** [September 26, 2025, 9:42pm UTC](https://discourse.julialang.org/t/juliaup-installer-fails-on-aws-cannot-open-dev-pts-1-permission-denied/132685 "2025-09-26T21:42:25Z")

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After ssh-ing into an AWS instance (I’m new to AWS), I’m attempting to install juliaup with the standard script curl -fsSL https://install.julialang.org | sh, but am met with sh: 148: cannot open /dev/pts/1: Permission…

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## [Constructing a chemical reaction network from an ode system](https://discourse.julialang.org/t/constructing-a-chemical-reaction-network-from-an-ode-system/132682)

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**Author:** [@adhalanay](https://discourse.julialang.org/u/adhalanay)\
**Replies:** 1\
**Last updated:** [September 26, 2025, 8:02pm UTC](https://discourse.julialang.org/t/constructing-a-chemical-reaction-network-from-an-ode-system/132682 "2025-09-26T20:02:36Z")

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The so called Hungarian Lemma states that a system of ODEs with polynomial RHS x'\_j =f\_j(x),j=\\overline{1,n} comes from a mass-action chemical reaction network if and only if all the negative monomials of f\_f have x\_j …

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## [What is the status of type inference of recursive calls? Odd statefulness?](https://discourse.julialang.org/t/what-is-the-status-of-type-inference-of-recursive-calls-odd-statefulness/132545)

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**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 4\
**Last updated:** [September 26, 2025, 7:09pm UTC](https://discourse.julialang.org/t/what-is-the-status-of-type-inference-of-recursive-calls-odd-statefulness/132545 "2025-09-26T19:09:15Z")

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Evidently, the situation has improved from v1.10.10 because the examples from the links below on v1.11.7 are inferred with concrete return types and pass JET.@report\_opt. Note that type instabilities that don’t cause int…

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## [How can I register/align shifted image stacks?](https://discourse.julialang.org/t/how-can-i-register-align-shifted-image-stacks/29244)

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**Author:** [@Moses](https://discourse.julialang.org/u/Moses)\
**Replies:** 45\
**Last updated:** [September 26, 2025, 6:03pm UTC](https://discourse.julialang.org/t/how-can-i-register-align-shifted-image-stacks/29244 "2025-09-26T18:03:13Z")

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Good evening. I have the problem that in many microscopy experiments the sample drifts over time (mainly because a buffer solution is flowing continuously over the sample). I am looking for a way to register/align the …

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## [\[ANN\] PixelMatch.jl](https://discourse.julialang.org/t/ann-pixelmatch-jl/132679)

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**Author:** [@jules](https://discourse.julialang.org/u/jules)\
**Replies:** 0\
**Last updated:** [September 26, 2025, 3:43pm UTC](https://discourse.julialang.org/t/ann-pixelmatch-jl/132679 "2025-09-26T15:43:24Z")

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PixelMatch.jl is a small package which is a translation of mapbox/pixelmatch. You can run visual regression tests with it and it’s more sensitive to pixel-level changes than the standard algorithm you get in ReferenceTes…

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## [Standalone window from Plots.jl or GLMakie in jupyter lab?](https://discourse.julialang.org/t/standalone-window-from-plots-jl-or-glmakie-in-jupyter-lab/132674)

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**Author:** [@cpf-work](https://discourse.julialang.org/u/cpf-work)\
**Replies:** 2\
**Last updated:** [September 26, 2025, 2:20pm UTC](https://discourse.julialang.org/t/standalone-window-from-plots-jl-or-glmakie-in-jupyter-lab/132674 "2025-09-26T14:20:26Z")

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I’m using jupyter lab and have trouble to get a standalone window (not inline) from Plots.jl and GLMakie. I tried using Plots scatter(rand(5), rand(5), legend=false) gui() and also plt = plot() scatter!(plt, rand(5), …

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## [Jupyter lab run\_kernel not working](https://discourse.julialang.org/t/jupyter-lab-run-kernel-not-working/132671)

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**Author:** [@cpf-work](https://discourse.julialang.org/u/cpf-work)\
**Replies:** 0\
**Last updated:** [September 26, 2025, 8:59am UTC](https://discourse.julialang.org/t/jupyter-lab-run-kernel-not-working/132671 "2025-09-26T08:59:43Z")

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I finally decided to update to 1.11 and juliaup. So I installed 1.11 with juliaup and got rid of the former 1.9 version I used. Ì’m on Windows 11. Everything seemed working except jupyterlab. I get the following in the t…

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## [Changing the name of a package](https://discourse.julialang.org/t/changing-the-name-of-a-package/14960)

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**Author:** [@heliosdrm](https://discourse.julialang.org/u/heliosdrm)\
**Replies:** 8\
**Last updated:** [September 26, 2025, 7:55am UTC](https://discourse.julialang.org/t/changing-the-name-of-a-package/14960 "2025-09-26T07:55:52Z")

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I have been developing the package RecurrenceAnalysis for some time. I used that name because the usual way of calling what it does looked too long for a package name (“Recurrence Quantification Analysis”), and acronyms…

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## [Passing state variable to handler functions](https://discourse.julialang.org/t/passing-state-variable-to-handler-functions/119268)

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**Author:** [@ehsani63](https://discourse.julialang.org/u/ehsani63)\
**Replies:** 1\
**Last updated:** [September 26, 2025, 4:23am UTC](https://discourse.julialang.org/t/passing-state-variable-to-handler-functions/119268 "2025-09-26T04:23:10Z")

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A general question about Julia web frameworks like Oxygen.jl: Is there an easy way to pass a state variable as an argument to handler functions, or is relying on global variables the only option?

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## [\[Oxygen.jl\] returning plots to user](https://discourse.julialang.org/t/oxygen-jl-returning-plots-to-user/126341)

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**Author:** [@braamvandyk](https://discourse.julialang.org/u/braamvandyk)\
**Replies:** 4\
**Last updated:** [September 26, 2025, 4:08am UTC](https://discourse.julialang.org/t/oxygen-jl-returning-plots-to-user/126341 "2025-09-26T04:08:09Z")

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Hi all My first attempt at putting together a browser-based interface and also any form of web programming, so I really don’t know what it is that I don’t know. Apologies for asking the obvious. I am using Oxygen.jl for…

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## [What lessons could Julia's autodiff ecosystem learn from Stan's TinyGrad?](https://discourse.julialang.org/t/what-lessons-could-julias-autodiff-ecosystem-learn-from-stans-tinygrad/103070)

<div class="topic-metadata">

**Author:** [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Replies:** 45\
**Last updated:** [September 26, 2025, 1:16am UTC](https://discourse.julialang.org/t/what-lessons-could-julias-autodiff-ecosystem-learn-from-stans-tinygrad/103070 "2025-09-26T01:16:10Z")

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This came up in the What steps should the Julia community take to bring Julia to the next level of popularity? megathread and I think it’s worth having a dedicated topic on the point. I’ll merge some existing posts into…

[Previous page](https://discourse.julialang.org/latest.md?page=103)

[Next page](https://discourse.julialang.org/latest.md?page=105)