# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1750

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

**Page:** 1751

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## [RDataset: Error while running examples](https://discourse.julialang.org/t/rdataset-error-while-running-examples/39255)

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**Author:** [@v-i-s-h](https://discourse.julialang.org/u/v-i-s-h)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 11:59am UTC](https://discourse.julialang.org/t/rdataset-error-while-running-examples/39255 "2020-05-11T11:59:01Z")

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Hi, I am trying to use RDatasets. In the github README, the following code is given as an example using RDatasets iris = dataset("datasets", "iris") neuro = dataset("boot", "neuro") But I’m getting the following error…

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## [Impute by index](https://discourse.julialang.org/t/impute-by-index/39232)

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**Author:** [@chedieck](https://discourse.julialang.org/u/chedieck)\
**Replies:** 8\
**Last updated:** [May 11, 2020, 10:40am UTC](https://discourse.julialang.org/t/impute-by-index/39232 "2020-05-11T10:40:45Z")

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Hello! So I am new to the language, I have been learning now about all the joins, the select, combine, transform, etc. But there is an issue that I don’t know how to solve without creating a for loop: Suppose I have a…

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## [Can't iterate over an AbstractArray with custom indexing?](https://discourse.julialang.org/t/cant-iterate-over-an-abstractarray-with-custom-indexing/39269)

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**Author:** [@chelate](https://discourse.julialang.org/u/chelate)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 9:35am UTC](https://discourse.julialang.org/t/cant-iterate-over-an-abstractarray-with-custom-indexing/39269 "2020-05-11T09:35:38Z")

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So (like many other physicists trying out Julia), I went and tried to build a spherical tensor type where the size L is a type parameter and indexing runs from -L: L. I followed the manual and defined an abstract unit ra…

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## [Gtk.jl and webkit](https://discourse.julialang.org/t/gtk-jl-and-webkit/39208)

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**Author:** [@Carlos\_Werner](https://discourse.julialang.org/u/Carlos_Werner)\
**Replies:** 1\
**Last updated:** [May 11, 2020, 8:54am UTC](https://discourse.julialang.org/t/gtk-jl-and-webkit/39208 "2020-05-11T08:54:38Z")

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The gtk.jl package supports webkit If it does, someone can show you an example ?

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## [Issue with updating packages](https://discourse.julialang.org/t/issue-with-updating-packages/31233)

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**Author:** [@alewolf](https://discourse.julialang.org/u/alewolf)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 8:04am UTC](https://discourse.julialang.org/t/issue-with-updating-packages/31233 "2020-05-11T08:04:02Z")

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Hi, I have my token file in the correct directory. However everytime I try to update a package I get this message. I use github to login… and this was not an issue until about a week ago. Here is an exmaple: (v1.2) …

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## [PDAL Plugin](https://discourse.julialang.org/t/pdal-plugin/37999)

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**Author:** [@Julian\_Fell](https://discourse.julialang.org/u/Julian_Fell)\
**Replies:** 18\
**Last updated:** [May 11, 2020, 7:30am UTC](https://discourse.julialang.org/t/pdal-plugin/37999 "2020-05-11T07:30:09Z")

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Hi everyone. I’ve been working on an experimental plugin for using Julia as an embedded stage in PDAL. There is a similar feature for using Python already. I’d like to get a feel for how much people are using Julia for …

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## [Senior Engineer in Munich/Worldwide](https://discourse.julialang.org/t/senior-engineer-in-munich-worldwide/38542)

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**Author:** [@laborg](https://discourse.julialang.org/u/laborg)\
**Replies:** 1\
**Last updated:** [May 11, 2020, 7:29am UTC](https://discourse.julialang.org/t/senior-engineer-in-munich-worldwide/38542 "2020-05-11T07:29:04Z")

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Are you looking for a meaningful job and are interested in improving human health? “Improving Human Health” is Trium’s primary company objective, by online collection, analysis and dissemination of clinical and biomedic…

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## [Is it possible to use julia in windows subsystem for linux in juno?](https://discourse.julialang.org/t/is-it-possible-to-use-julia-in-windows-subsystem-for-linux-in-juno/11510)

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**Author:** [@Chong\_Wang](https://discourse.julialang.org/u/Chong_Wang)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 6:42am UTC](https://discourse.julialang.org/t/is-it-possible-to-use-julia-in-windows-subsystem-for-linux-in-juno/11510 "2020-05-11T06:42:58Z")

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I recently switched back to windows due to various reasons. However, I miss the feeling of using julia under linux. Now that windows subsystem for linux (WSL) is quite stable now. Is it possible to use julia in WSL in ju…

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## ["gradcheck" in Flux?](https://discourse.julialang.org/t/gradcheck-in-flux/39158)

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**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 5:53am UTC](https://discourse.julialang.org/t/gradcheck-in-flux/39158 "2020-05-11T05:53:19Z")

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Is there a function to check the Zygote gradient against a finite-difference? I think I had seen something in discussions here but cannot find it, also not in the docs

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## [Flux Activations() computes the forward pass again](https://discourse.julialang.org/t/flux-activations-computes-the-forward-pass-again/38904)

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**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 2\
**Last updated:** [May 11, 2020, 5:50am UTC](https://discourse.julialang.org/t/flux-activations-computes-the-forward-pass-again/38904 "2020-05-11T05:50:43Z")

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It looks like the activations() function (in basic.jl) computes the forward pass to obtain the activations, which would mean that it is computed twice. I guess a fix for this would be to implement a custom alternative …

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## [How to use Juno and Julia to develop a project?](https://discourse.julialang.org/t/how-to-use-juno-and-julia-to-develop-a-project/39225)

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**Author:** [@Laszlo\_Nagy](https://discourse.julialang.org/u/Laszlo_Nagy)\
**Replies:** 8\
**Last updated:** [May 11, 2020, 4:58am UTC](https://discourse.julialang.org/t/how-to-use-juno-and-julia-to-develop-a-project/39225 "2020-05-11T04:58:39Z")

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I’m about to write my first (test) project with Julia. I have installed Juno and , because I saw that is the “standard” for development. I have entered examples from the official Julia documentation into a REPL prompt so…

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## [Documenter handling Internal (private) modules](https://discourse.julialang.org/t/documenter-handling-internal-private-modules/39242)

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**Author:** [@pixel27](https://discourse.julialang.org/u/pixel27)\
**Replies:** 1\
**Last updated:** [May 11, 2020, 3:38am UTC](https://discourse.julialang.org/t/documenter-handling-internal-private-modules/39242 "2020-05-11T03:38:23Z")

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I am working on the documentation for module that mostly just bridges the gap between Julia and a C library. There are two methods that I expose that are fully written in Julia because they do not have a counterpart in …

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## [Adding a package stops at "Resolving package versions" since yesterday](https://discourse.julialang.org/t/adding-a-package-stops-at-resolving-package-versions-since-yesterday/39233)

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**Author:** [@peterj](https://discourse.julialang.org/u/peterj)\
**Replies:** 1\
**Last updated:** [May 11, 2020, 3:01am UTC](https://discourse.julialang.org/t/adding-a-package-stops-at-resolving-package-versions-since-yesterday/39233 "2020-05-11T03:01:15Z")

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This is a recent problem, I’m not sure what’s causing it, and I’m wondering if anyone has a solution. (@v1.4) pkg\> add PkgTemplates Updating registry at \`C:\\Users\\peter\\.julia\\registries\\General\` Updating git-repo…

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## [Why is the parallel map so slow?](https://discourse.julialang.org/t/why-is-the-parallel-map-so-slow/39250)

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**Author:** [@Tofi](https://discourse.julialang.org/u/Tofi)\
**Replies:** 2\
**Last updated:** [May 10, 2020, 11:49pm UTC](https://discourse.julialang.org/t/why-is-the-parallel-map-so-slow/39250 "2020-05-10T23:49:57Z")

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I have an array a defined as: julia\> a = collect(1:10000) I can map a squaring function over the array and time the execution as following: julia\> @time map((x)-\>x^2, a) On my machine, the line above runs in 0.05 sec…

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## [A little problem with combine from DataFrames.jl](https://discourse.julialang.org/t/a-little-problem-with-combine-from-dataframes-jl/39244)

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**Author:** [@ameresv](https://discourse.julialang.org/u/ameresv)\
**Replies:** 2\
**Last updated:** [May 10, 2020, 10:26pm UTC](https://discourse.julialang.org/t/a-little-problem-with-combine-from-dataframes-jl/39244 "2020-05-10T22:26:40Z")

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Hi! I am learning the usage of DataFrames.jl from Julia Academy and I found a problem. When I used combine for creating a new column, the tutorial and any other material (like this) that I have consulted says the follow…

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## [How to make dynamic plots with slider bars](https://discourse.julialang.org/t/how-to-make-dynamic-plots-with-slider-bars/30698)

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**Author:** [@HenriDeh](https://discourse.julialang.org/u/HenriDeh)\
**Replies:** 7\
**Last updated:** [May 10, 2020, 7:09pm UTC](https://discourse.julialang.org/t/how-to-make-dynamic-plots-with-slider-bars/30698 "2020-05-10T19:09:46Z")

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I have a routine that given some arguments outputs a plot. I would like to create an interface where I can change each argument using a slider bar and the plot would update in real-time. Is there a package that allows su…

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## [Why accessing a Float property allocates memory?](https://discourse.julialang.org/t/why-accessing-a-float-property-allocates-memory/39235)

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**Author:** [@emancu](https://discourse.julialang.org/u/emancu)\
**Replies:** 2\
**Last updated:** [May 10, 2020, 7:01pm UTC](https://discourse.julialang.org/t/why-accessing-a-float-property-allocates-memory/39235 "2020-05-10T19:01:14Z")

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Hello community! I’m running a simulation which requires millions of iterations, and the memory consumption (even temporary) is huge and I would like to reduce it. Pursuing this, I found something that I wasn’t expectin…

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## [Investigating a package dependency issue](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230)

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**Author:** [@sijo](https://discourse.julialang.org/u/sijo)\
**Replies:** 3\
**Last updated:** [May 10, 2020, 4:39pm UTC](https://discourse.julialang.org/t/investigating-a-package-dependency-issue/39230 "2020-05-10T16:39:03Z")

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Hi, what is the recommended way to investigate a package dependency issue? I’m asking a general question in the “teach to fish” spirit, but here are the specifics: I can’t get SystemBenchmark.jl to run because of an is…

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## [Manipulating expressions with macros](https://discourse.julialang.org/t/manipulating-expressions-with-macros/39229)

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**Author:** [@Jollywatt](https://discourse.julialang.org/u/Jollywatt)\
**Replies:** 1\
**Last updated:** [May 10, 2020, 2:46pm UTC](https://discourse.julialang.org/t/manipulating-expressions-with-macros/39229 "2020-05-10T14:46:28Z")

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Hi. I’m having trouble defining a macro which manipulates expressions containing $’s. It’s best illustrated by example: Is it possible to define a macro @newrule such that for op ∈ (+, -) @newrule $op(a, 0) =\> a end e…

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## [Julia deep learning library which supports array mutation?](https://discourse.julialang.org/t/julia-deep-learning-library-which-supports-array-mutation/39215)

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**Author:** [@DeepQ](https://discourse.julialang.org/u/DeepQ)\
**Replies:** 4\
**Last updated:** [May 10, 2020, 12:24pm UTC](https://discourse.julialang.org/t/julia-deep-learning-library-which-supports-array-mutation/39215 "2020-05-10T12:24:15Z")

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I am searching for a Julia deep learning library which supports array mutation so I don’t need to store the arrays in a buffer.

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## [Domain error using nlsolve](https://discourse.julialang.org/t/domain-error-using-nlsolve/38722)

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**Author:** [@R\_Surya\_Narayan](https://discourse.julialang.org/u/R_Surya_Narayan)\
**Replies:** 27\
**Last updated:** [May 10, 2020, 10:07am UTC](https://discourse.julialang.org/t/domain-error-using-nlsolve/38722 "2020-05-10T10:07:04Z")

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I am trying to solve non linear equation systems in gas dynamics using nlsolve, but the solver seems to breakdown when I call it at h = 0.1R\_A2Theta\_D (see code below) using NLsolve using DifferentialEquations ## About …

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## [Five argument mul! in FFTW](https://discourse.julialang.org/t/five-argument-mul-in-fftw/35443)

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**Author:** [@ranocha](https://discourse.julialang.org/u/ranocha)\
**Replies:** 3\
**Last updated:** [May 10, 2020, 10:01am UTC](https://discourse.julialang.org/t/five-argument-mul-in-fftw/35443 "2020-05-10T10:01:58Z")

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I couldn’t find a 5 argument method of mul! in FFTW.jl for FFTW.rFFTWPlan and its siblings. Would it be reasonable to add such methods? In particular, I would like to be able to do something like julia\> using LinearAlge…

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## [Improve perfromance of DifferentialEquations, when odefun is evaluated repeatedly and many timepoints are required](https://discourse.julialang.org/t/improve-perfromance-of-differentialequations-when-odefun-is-evaluated-repeatedly-and-many-timepoints-are-required/39110)

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**Author:** [@user22](https://discourse.julialang.org/u/user22)\
**Replies:** 8\
**Last updated:** [May 10, 2020, 8:05am UTC](https://discourse.julialang.org/t/improve-perfromance-of-differentialequations-when-odefun-is-evaluated-repeatedly-and-many-timepoints-are-required/39110 "2020-05-10T08:05:05Z")

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Is it possible to improve the performance of an ODE system solving, if we have to evaluate the equation many times with different parameters (not in a Monte Carlo manner, but sequentially), and if we want to evaluate par…

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## [Etiquette question on posting to Announcements](https://discourse.julialang.org/t/etiquette-question-on-posting-to-announcements/39193)

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**Author:** [@anon94023334](https://discourse.julialang.org/u/anon94023334)\
**Replies:** 11\
**Last updated:** [May 10, 2020, 7:36am UTC](https://discourse.julialang.org/t/etiquette-question-on-posting-to-announcements/39193 "2020-05-10T07:36:47Z")

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I’ve been posting announcements of new LG versions in the Community/Announcements forum for a while now, but I’ve received a comment from someone that it might not be appropriate to post things like patch release announc…

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## [Syntax for import from parent module](https://discourse.julialang.org/t/syntax-for-import-from-parent-module/434)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 8\
**Last updated:** [May 10, 2020, 7:24am UTC](https://discourse.julialang.org/t/syntax-for-import-from-parent-module/434 "2020-05-10T07:24:48Z")

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consider this MWE: module Foo macro id(expr) expr end module Bar import Foo: @id # how to refer to parent here without naming it? @id(1+1) end end Is it possible to import a symbol from the parent modul…

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## [Deploying a website with Franklin](https://discourse.julialang.org/t/deploying-a-website-with-franklin/38930)

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**Author:** [@chakravala](https://discourse.julialang.org/u/chakravala)\
**Replies:** 9\
**Last updated:** [May 10, 2020, 7:24am UTC](https://discourse.julialang.org/t/deploying-a-website-with-franklin/38930 "2020-05-10T07:24:10Z")

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I am deploying a website with Franklin.jl on my own web server instead of using GitHub. When I use serve() with Franklin and view the website on localhost, it appears correctly. However, when I deploy the \_\_site folder…

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## [How do I pass Optim.Options(...) to DiffEqFlux.sciml\_train(...)](https://discourse.julialang.org/t/how-do-i-pass-optim-options-to-diffeqflux-sciml-train/39127)

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**Author:** [@Matthew\_Overlin](https://discourse.julialang.org/u/Matthew_Overlin)\
**Replies:** 1\
**Last updated:** [May 10, 2020, 6:22am UTC](https://discourse.julialang.org/t/how-do-i-pass-optim-options-to-diffeqflux-sciml-train/39127 "2020-05-10T06:22:29Z")

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I am using DiffEqFlux to train neural ODEs. Following the example at this link, I am using the function DiffEqFlux.scil\_train to train the neural network. I’d like to pass/customize some things with the optimizer. For…

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## [Identical dependency being replaced while importing packages](https://discourse.julialang.org/t/identical-dependency-being-replaced-while-importing-packages/39209)

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**Author:** [@jishnub](https://discourse.julialang.org/u/jishnub)\
**Replies:** 1\
**Last updated:** [May 10, 2020, 5:09am UTC](https://discourse.julialang.org/t/identical-dependency-being-replaced-while-importing-packages/39209 "2020-05-10T05:09:19Z")

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I am facing an issue that seems to have cropped up suddenly. I am trying to import the packages JLD2 and NamedArrays on a HPC cluster (not sure if this is relevant), and they seem to clash over DataStructures. I’m not su…

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## [Error converting from a DataFrames.DataFrame to a Pandas.Dataframe](https://discourse.julialang.org/t/error-converting-from-a-dataframes-dataframe-to-a-pandas-dataframe/39162)

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**Author:** [@00krishna](https://discourse.julialang.org/u/00krishna)\
**Replies:** 5\
**Last updated:** [May 10, 2020, 1:52am UTC](https://discourse.julialang.org/t/error-converting-from-a-dataframes-dataframe-to-a-pandas-dataframe/39162 "2020-05-10T01:52:04Z")

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I have a pretty large DataFrames.jl dataframe that I am using for some data simulations. However, I need to pass the data back to python for some visualizations and @tkf suggested that I convert the DataFrames DataFrame …

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## [Makie doesn't display plot when using a custom Julia sysimage](https://discourse.julialang.org/t/makie-doesnt-display-plot-when-using-a-custom-julia-sysimage/38515)

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**Author:** [@brianguenter](https://discourse.julialang.org/u/brianguenter)\
**Replies:** 3\
**Last updated:** [May 10, 2020, 1:39am UTC](https://discourse.julialang.org/t/makie-doesnt-display-plot-when-using-a-custom-julia-sysimage/38515 "2020-05-10T01:39:00Z")

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I created a custom system image using the VSCode sysimage feature. Makie plots display fine when I run in a Julia repl that is not started with the sysimage. But I only get text output when drawing Makie plots in a Juli…

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