# Latest

**URL:** https://discourse.julialang.org/latest.md?page=938

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

**Page:** 939

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## [Common zscale for contour subplots](https://discourse.julialang.org/t/common-zscale-for-contour-subplots/86543)

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**Author:** [@Christopher\_Fisher](https://discourse.julialang.org/u/Christopher_Fisher)\
**Replies:** 4\
**Last updated:** [August 30, 2022, 4:36pm UTC](https://discourse.julialang.org/t/common-zscale-for-contour-subplots/86543 "2022-08-30T16:36:11Z")

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Hi all, I have a group of contour subplots (see below). I would like to reduce the scales to one, rather than have redundant scales. I am trying to figure out how to (1) remove white space in color scale for missing val…

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## [\[Discourse plugin\] Saving searches](https://discourse.julialang.org/t/discourse-plugin-saving-searches/86545)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 4\
**Last updated:** [August 30, 2022, 4:17pm UTC](https://discourse.julialang.org/t/discourse-plugin-saving-searches/86545 "2022-08-30T16:17:51Z")

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Hey, i would love to be able to make a search and watch that search: get notified if anything new pops up in this research. After a look on discourse’s forum there : Watching and sending notifications for keywords? - #…

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## [Julia 1.8: ChainRules does not have Adapt in its dependencies](https://discourse.julialang.org/t/julia-1-8-chainrules-does-not-have-adapt-in-its-dependencies/86474)

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**Author:** [@Xavier\_Gonzalez](https://discourse.julialang.org/u/Xavier_Gonzalez)\
**Replies:** 4\
**Last updated:** [August 30, 2022, 2:57pm UTC](https://discourse.julialang.org/t/julia-1-8-chainrules-does-not-have-adapt-in-its-dependencies/86474 "2022-08-30T14:57:21Z")

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I’m working on a codebase I’ve inherited. It runs completely fine in Julia 1.7 However, if I run identical code in Julia 1.8, I get the following error message ERROR: LoadError: ArgumentError: Package ChainRules does n…

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## [How to use JuliaCall?](https://discourse.julialang.org/t/how-to-use-juliacall/86549)

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**Author:** [@joa-quim](https://discourse.julialang.org/u/joa-quim)\
**Replies:** 4\
**Last updated:** [August 30, 2022, 2:49pm UTC](https://discourse.julialang.org/t/how-to-use-juliacall/86549 "2022-08-30T14:49:55Z")

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Hi, I want to try JuliaCall but I’m finding the instructions extremely difficult to understand. This is my second attempt so I don’t remember well what I did in the first time. This time I managed to reach the point whe…

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## [How to use 3d annotations](https://discourse.julialang.org/t/how-to-use-3d-annotations/86551)

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**Author:** [@Starpower\_Power](https://discourse.julialang.org/u/Starpower_Power)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 2:28pm UTC](https://discourse.julialang.org/t/how-to-use-3d-annotations/86551 "2022-08-30T14:28:33Z")

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as of now we can only use 2d annotations, how to use 3d annotations. thanks

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## [Pluto Ctrl-C Not Working on Julia 1.8.0](https://discourse.julialang.org/t/pluto-ctrl-c-not-working-on-julia-1-8-0/86534)

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**Author:** [@TI36XPro](https://discourse.julialang.org/u/TI36XPro)\
**Replies:** 6\
**Last updated:** [August 30, 2022, 2:25pm UTC](https://discourse.julialang.org/t/pluto-ctrl-c-not-working-on-julia-1-8-0/86534 "2022-08-30T14:25:31Z")

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I recently updated my environment and Julia version. I am running Julia 1.8.0 and Pluto v0.19.11. The packages I have installed in this environment are OhMyREPL v0.5.12 Pluto v0.19.11 PlutoUI v0.7.39 Revise v3.4.0 I …

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## [Pkg introduction blog post](https://discourse.julialang.org/t/pkg-introduction-blog-post/86462)

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**Author:** [@jules](https://discourse.julialang.org/u/jules)\
**Replies:** 3\
**Last updated:** [August 30, 2022, 2:00pm UTC](https://discourse.julialang.org/t/pkg-introduction-blog-post/86462 "2022-08-30T14:00:50Z")

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I wrote a post to explain Pkg and environments for beginners, with a focus on some of the aspects I found confusing myself when I started out. Hope it helps: https://jkrumbiegel.com/pages/2022-08-26-pkg-introduction/

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## [\[ANN\] BehaviorTree.jl](https://discourse.julialang.org/t/ann-behaviortree-jl/53829)

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**Author:** [@fabid](https://discourse.julialang.org/u/fabid)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 1:16pm UTC](https://discourse.julialang.org/t/ann-behaviortree-jl/53829 "2022-08-30T13:16:18Z")

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I am happy to announce BehaviorTree.jl, a simple Behavior Trees implementation in Julia. Behavior Trees are an alternative to state machines, commonly used to to specify behaviors of autonomous agents. While this is wa…

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## [ERROR: Task Failed Exception reading CSV](https://discourse.julialang.org/t/error-task-failed-exception-reading-csv/86544)

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**Author:** [@lucasmsoares96](https://discourse.julialang.org/u/lucasmsoares96)\
**Replies:** 3\
**Last updated:** [August 30, 2022, 1:12pm UTC](https://discourse.julialang.org/t/error-task-failed-exception-reading-csv/86544 "2022-08-30T13:12:28Z")

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I’m trying to read a CSV file from Kaggle like this: https://www.kaggle.com/datasets/andrewmvd/data-engineer-jobs?resource=download using CSV using DataFrames df = CSV.read("DataEngineer.csv", DataFrame; delim=',') B…

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## [Swap two cells in Pluto](https://discourse.julialang.org/t/swap-two-cells-in-pluto/86525)

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**Author:** [@Xavier\_Gonzalez](https://discourse.julialang.org/u/Xavier_Gonzalez)\
**Replies:** 5\
**Last updated:** [August 30, 2022, 12:09pm UTC](https://discourse.julialang.org/t/swap-two-cells-in-pluto/86525 "2022-08-30T12:09:34Z")

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In colab, I can switch the location of two cells by pressing up or down arrows. Is there an equivalent way to do so in Pluto? I would really like to do so in order to restructure the order of my notebook.

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## [Symbolics and polynomials](https://discourse.julialang.org/t/symbolics-and-polynomials/86541)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 0\
**Last updated:** [August 30, 2022, 11:23am UTC](https://discourse.julialang.org/t/symbolics-and-polynomials/86541 "2022-08-30T11:23:50Z")

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What is the best package for working with polynomials with Symbolics.jl?

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## [Plotting timeseries](https://discourse.julialang.org/t/plotting-timeseries/86539)

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**Author:** [@this\_josh](https://discourse.julialang.org/u/this_josh)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 9:22am UTC](https://discourse.julialang.org/t/plotting-timeseries/86539 "2022-08-30T09:22:44Z")

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I have 96 samples at 15 minute intervals. I’d like to plot this with a marker for each sample and the x axis to be appropriate for my sample times (00:00, 00:15,…) although not comprehensive. using Dates using Plots y =…

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## [Citing Papers in Pluto](https://discourse.julialang.org/t/citing-papers-in-pluto/59544)

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**Author:** [@enweg](https://discourse.julialang.org/u/enweg)\
**Replies:** 4\
**Last updated:** [August 30, 2022, 8:40am UTC](https://discourse.julialang.org/t/citing-papers-in-pluto/59544 "2022-08-30T08:40:45Z")

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Hey, I recently saw the presentation on Pluto and really like the concept. I am actually so convinced of it that I was thinking about writing some lecture notes in it, so that students can directly experiment around. I …

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## [Does eig() which need Arpack.jl not support zygote?](https://discourse.julialang.org/t/does-eig-which-need-arpack-jl-not-support-zygote/86538)

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**Author:** [@F-YF](https://discourse.julialang.org/u/F-YF)\
**Replies:** 0\
**Last updated:** [August 30, 2022, 7:28am UTC](https://discourse.julialang.org/t/does-eig-which-need-arpack-jl-not-support-zygote/86538 "2022-08-30T07:28:26Z")

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julia\> using Arpack julia\> function f(x) val, vec = eigs( x; nev = 1, which = :LM, maxiter = 300 ) return log(real(val\[1\])) end f (generic function with 1 method) julia\> x0 = rand(4,4) 4×4 Matr…

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## [Pkg behavior that confused me](https://discourse.julialang.org/t/pkg-behavior-that-confused-me/86453)

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**Author:** [@JackStrauss](https://discourse.julialang.org/u/JackStrauss)\
**Replies:** 18\
**Last updated:** [August 29, 2022, 9:40am UTC](https://discourse.julialang.org/t/pkg-behavior-that-confused-me/86453 "2022-08-29T09:40:17Z")

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Hello all I spent a long time chasing something very confusing to me in Pkg. when I run our code on the command line as we always do, it seems to run julia -e 'push!(LOAD\_PATH,"Zinstrument/");using Zinstrument;Process…

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## [How to get the first row of each group of a DataFrame and subtract that value from each subsequent row in that group?](https://discourse.julialang.org/t/how-to-get-the-first-row-of-each-group-of-a-dataframe-and-subtract-that-value-from-each-subsequent-row-in-that-group/86527)

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**Author:** [@akhibovska](https://discourse.julialang.org/u/akhibovska)\
**Replies:** 3\
**Last updated:** [August 30, 2022, 4:44am UTC](https://discourse.julialang.org/t/how-to-get-the-first-row-of-each-group-of-a-dataframe-and-subtract-that-value-from-each-subsequent-row-in-that-group/86527 "2022-08-30T04:44:08Z")

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Hi! Hope someone can help me figure out probably a pretty simple problem! I have a data set where I have a column called ‘Time’ and ‘Trial’. The time is recorded from the first trial in 4ms increments. I want to transfo…

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## [Is it possible to retain the explicit multiplication sign \* in Julia while using Symbolics? i.e turn off implicit multiplication](https://discourse.julialang.org/t/is-it-possible-to-retain-the-explicit-multiplication-sign-in-julia-while-using-symbolics-i-e-turn-off-implicit-multiplication/86533)

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**Author:** [@Nasser](https://discourse.julialang.org/u/Nasser)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 4:33am UTC](https://discourse.julialang.org/t/is-it-possible-to-retain-the-explicit-multiplication-sign-in-julia-while-using-symbolics-i-e-turn-off-implicit-multiplication/86533 "2022-08-30T04:33:22Z")

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I am mainly interested in symbolic Julia, but this also happens in all of Julia. Is it possible to keep the \* there in the expressions and not have the implicit multiplication? Here is an example julia\> using Symbolics…

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## [Known bugs in new Julia releases](https://discourse.julialang.org/t/known-bugs-in-new-julia-releases/85566)

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**Author:** [@GHTaarn](https://discourse.julialang.org/u/GHTaarn)\
**Replies:** 14\
**Last updated:** [August 30, 2022, 4:26am UTC](https://discourse.julialang.org/t/known-bugs-in-new-julia-releases/85566 "2022-08-30T04:26:21Z")

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Before we release Julia 1.8 I would like to get some clarity about how severe a known bug must be before it needs to be fixed before the next new release of Julia. Two months ago I reported what I thought was a bug t…

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## [(-x)^(1//2) gives error in Symbolics.jl](https://discourse.julialang.org/t/x-1-2-gives-error-in-symbolics-jl/86523)

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**Author:** [@Nasser](https://discourse.julialang.org/u/Nasser)\
**Replies:** 2\
**Last updated:** [August 30, 2022, 3:31am UTC](https://discourse.julialang.org/t/x-1-2-gives-error-in-symbolics-jl/86523 "2022-08-30T03:31:23Z")

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I was going to enter an issue for this, but thought to ask first here in case I am not using Julia symbolic correctly as I am still learning it. \>julia \_ \_ \_ \_(\_)\_ | Documentation: https://…

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## [Documenter: preprocess ?foo to \[\`foo\`\](@ref).. possible?](https://discourse.julialang.org/t/documenter-preprocess-foo-to-foo-ref-possible/86494)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 3\
**Last updated:** [August 30, 2022, 1:58am UTC](https://discourse.julialang.org/t/documenter-preprocess-foo-to-foo-ref-possible/86494 "2022-08-30T01:58:20Z")

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In my docstrings I often use "See ?foo for details". With Documenter, for most sinks this would be better as "See \[\`foo\`\](@ref) for details." But that would then look odd if one use the online help of the original func…

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## [Most effective way to check if neighboring values in a matrix are the same](https://discourse.julialang.org/t/most-effective-way-to-check-if-neighboring-values-in-a-matrix-are-the-same/86291)

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**Author:** [@phantom](https://discourse.julialang.org/u/phantom)\
**Replies:** 19\
**Last updated:** [August 30, 2022, 12:07am UTC](https://discourse.julialang.org/t/most-effective-way-to-check-if-neighboring-values-in-a-matrix-are-the-same/86291 "2022-08-30T00:07:01Z")

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Suppose A is the following matrix. 0.0 0.0 0.0 1.0 0.0 0.0 0.0 1.0 0.0 1.0 1.0 0.0 0.0 0.0 1.0 1.0 0.0 1.0 0.0 1.0 1.0 1.0 1.0 1.0 I want to check each row of the matrix for the number of times …

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## [User cut with JuMP and Gurobi](https://discourse.julialang.org/t/user-cut-with-jump-and-gurobi/86518)

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**Author:** [@Luiz\_Monteiro](https://discourse.julialang.org/u/Luiz_Monteiro)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 11:18pm UTC](https://discourse.julialang.org/t/user-cut-with-jump-and-gurobi/86518 "2022-08-29T23:18:57Z")

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Hi, I am trying to insert user cuts in a mixed-integer linear programming model (Location-routing problem). I’m using the sintax presented in JuMP documentation (Callbacks · JuMP), and model in direct mode (model1 = dir…

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## [Roadblocks to using Julia in a university](https://discourse.julialang.org/t/roadblocks-to-using-julia-in-a-university/86313)

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**Author:** [@uje](https://discourse.julialang.org/u/uje)\
**Replies:** 38\
**Last updated:** [August 29, 2022, 10:59pm UTC](https://discourse.julialang.org/t/roadblocks-to-using-julia-in-a-university/86313 "2022-08-29T22:59:14Z")

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Yesterday, in my university, our professor had a discussion with us yesterday on what programming language we’d love to use as the defacto to teach concepts from the foundation to the expert level on concepts like: Mu…

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## [Deepsimilar()?](https://discourse.julialang.org/t/deepsimilar/86466)

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**Author:** [@nicolas](https://discourse.julialang.org/u/nicolas)\
**Replies:** 7\
**Last updated:** [August 29, 2022, 10:56pm UTC](https://discourse.julialang.org/t/deepsimilar/86466 "2022-08-29T22:56:59Z")

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I am writing an optimization package where users can input arrays of arrays. For simple arrays, initialization can be done using similar() without copying values. For arrays of arrays however, I haven’t found anything ot…

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## [GeoStats.jl v0.33](https://discourse.julialang.org/t/geostats-jl-v0-33/86516)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 0\
**Last updated:** [August 29, 2022, 8:08pm UTC](https://discourse.julialang.org/t/geostats-jl-v0-33/86516 "2022-08-29T20:08:35Z")

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Overview This project release comes with a great number of performance improvements and fixes, including treatment of missing values, corrections in geometrical algorithms and more. We highly recommend updating if you ar…

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## [Converting an image rotation demo from JuliaCon 2021 (AMD -\> NVIDIA)](https://discourse.julialang.org/t/converting-an-image-rotation-demo-from-juliacon-2021-amd-nvidia/86365)

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**Author:** [@aaron\_pung](https://discourse.julialang.org/u/aaron_pung)\
**Replies:** 3\
**Last updated:** [August 29, 2022, 7:32pm UTC](https://discourse.julialang.org/t/converting-an-image-rotation-demo-from-juliacon-2021-amd-nvidia/86365 "2022-08-29T19:32:02Z")

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I’ve been trying to convert the rotate\_kernel function from the 2021 JuliaCon GPU Workshop to work with CUDA, but I’m having trouble. I’m new to building kernels on the GPU, but my current implementation of these functi…

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## [Symbolics and Polynomial](https://discourse.julialang.org/t/symbolics-and-polynomial/86503)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 3\
**Last updated:** [August 29, 2022, 7:31pm UTC](https://discourse.julialang.org/t/symbolics-and-polynomial/86503 "2022-08-29T19:31:24Z")

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Is there a function that lets you know if a given expression is a polynomial?

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## [CUDA.device() info is displayed, but neither printed nor stored on variable](https://discourse.julialang.org/t/cuda-device-info-is-displayed-but-neither-printed-nor-stored-on-variable/86330)

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**Author:** [@cirobr](https://discourse.julialang.org/u/cirobr)\
**Replies:** 4\
**Last updated:** [August 29, 2022, 7:05pm UTC](https://discourse.julialang.org/t/cuda-device-info-is-displayed-but-neither-printed-nor-stored-on-variable/86330 "2022-08-29T19:05:56Z")

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Cheers, The below command in my Julia 1.6.7 / CUDA v3.12.0 system: CUDA.device() has the answer: CuDevice(0): NVIDIA GeForce RTX 2060 However, when printing or storing the output on a variable, println( CUDA.…

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## [Searchsorted with predicate](https://discourse.julialang.org/t/searchsorted-with-predicate/86495)

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**Author:** [@aplavin](https://discourse.julialang.org/u/aplavin)\
**Replies:** 5\
**Last updated:** [August 29, 2022, 6:56pm UTC](https://discourse.julialang.org/t/searchsorted-with-predicate/86495 "2022-08-29T18:56:45Z")

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Often when using the searchsorted function family, I wish predicate versions of those functions existed: searchsorted(==(5), array) searchsorted(\>(5), array) searchsortedfirst(\>(5), array) searchsortedlast(\<=(5), array)…

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## [The following package names could not be resolved: in manifest but not in project](https://discourse.julialang.org/t/the-following-package-names-could-not-be-resolved-in-manifest-but-not-in-project/86509)

<div class="topic-metadata">

**Author:** [@Xavier\_Gonzalez](https://discourse.julialang.org/u/Xavier_Gonzalez)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 6:42pm UTC](https://discourse.julialang.org/t/the-following-package-names-could-not-be-resolved-in-manifest-but-not-in-project/86509 "2022-08-29T18:42:05Z")

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I am getting weird errors with ChainRules in Julia 1.8 To try to fix the problem, I went into the package manager for my project, and tried both rm ChainRules and rm Zygote. Both times I got the following error message: …

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