# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1560

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

**Page:** 1561

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## [Nomenclature of the Reverse Function](https://discourse.julialang.org/t/nomenclature-of-the-reverse-function/50887)

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**Author:** [@TheCedarPrince](https://discourse.julialang.org/u/TheCedarPrince)\
**Replies:** 4\
**Last updated:** [November 28, 2020, 10:16pm UTC](https://discourse.julialang.org/t/nomenclature-of-the-reverse-function/50887 "2020-11-28T22:16:24Z")

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Hi all! I have been working on trying to understand the reverse function in Julia. I have an array whose values I would like to flip horizontally. I specify in the function reverse(my\_data, dims = 1) which does the job.…

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## [Optim, Forward Differentiation and OnceDifferentiable with MLE](https://discourse.julialang.org/t/optim-forward-differentiation-and-oncedifferentiable-with-mle/16320)

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**Author:** [@cosmia](https://discourse.julialang.org/u/cosmia)\
**Replies:** 18\
**Last updated:** [November 28, 2020, 8:52pm UTC](https://discourse.julialang.org/t/optim-forward-differentiation-and-oncedifferentiable-with-mle/16320 "2020-11-28T20:52:36Z")

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Hi guys, I am estimating a model by Maximum Likelihood. So far, I’ve been using Nelder-Mead as the optimization method where I don’t need to provide any gradient or Hessian. Convergence has been somewhat slow, and I usu…

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## [Does an Artifact download always need to be a tarball/zipped file?](https://discourse.julialang.org/t/does-an-artifact-download-always-need-to-be-a-tarball-zipped-file/33964)

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**Author:** [@CiaranOMara](https://discourse.julialang.org/u/CiaranOMara)\
**Replies:** 4\
**Last updated:** [November 28, 2020, 8:24pm UTC](https://discourse.julialang.org/t/does-an-artifact-download-always-need-to-be-a-tarball-zipped-file/33964 "2020-11-28T20:24:17Z")

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I was hoping to bind an unzipped file as a download-artifact. However, the download\_artifact function always seems to attempt to unpack/unzip the downloaded file. How are other people handling/binding plain unzipped fil…

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## [Permutation of elements in array + composition of functions resulting into an extremely inefficient runtime?](https://discourse.julialang.org/t/permutation-of-elements-in-array-composition-of-functions-resulting-into-an-extremely-inefficient-runtime/48047)

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**Author:** [@GuidoDipietro](https://discourse.julialang.org/u/GuidoDipietro)\
**Replies:** 6\
**Last updated:** [November 28, 2020, 7:50pm UTC](https://discourse.julialang.org/t/permutation-of-elements-in-array-composition-of-functions-resulting-into-an-extremely-inefficient-runtime/48047 "2020-11-28T19:50:22Z")

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Hey there. I have started using Julia today or yesterday, and there is something happening here that is driving me a little bit crazy. I wanted to model a group of permutations (specifically, the permutation group of a …

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## [DataFramesMeta release thread](https://discourse.julialang.org/t/dataframesmeta-release-thread/50911)

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**Author:** [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)\
**Replies:** 0\
**Last updated:** [November 28, 2020, 7:15pm UTC](https://discourse.julialang.org/t/dataframesmeta-release-thread/50911 "2020-11-28T19:15:46Z")

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Release announcements of DataFramesMeta Hello everyone! I am please to announce that yesterday DataFramesMeta had it’s 0.6.0 release, a breaking change from the previous version of 0.5.1. This post describes the new rele…

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## [Julia Architects / Control Engineers / Data Scientists (Europe Remote)](https://discourse.julialang.org/t/julia-architects-control-engineers-data-scientists-europe-remote/50906)

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**Author:** [@wrighty](https://discourse.julialang.org/u/wrighty)\
**Replies:** 0\
**Last updated:** [November 28, 2020, 6:44pm UTC](https://discourse.julialang.org/t/julia-architects-control-engineers-data-scientists-europe-remote/50906 "2020-11-28T18:44:52Z")

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Hello everyone, I’m from the team at arboricity, where we are building a better approach to modelling and managing water supply networks around the world. We have chosen Julia for the numerical functionality of our plat…

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## [Trying to add Gaston.jl, missing Gnuplot for some reason](https://discourse.julialang.org/t/trying-to-add-gaston-jl-missing-gnuplot-for-some-reason/50888)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 10\
**Last updated:** [November 28, 2020, 6:20pm UTC](https://discourse.julialang.org/t/trying-to-add-gaston-jl-missing-gnuplot-for-some-reason/50888 "2020-11-28T18:20:13Z")

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When I test Gaston.jl, I’m told that Gnuplots is not available on the system. How do I add this? ┌ Warning: Gnuplot is not available on this system. Gaston will be unable to produce any plots. └ @ Gaston C:\\Users\\Brett…

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## [Gaussian Process Model with Turing](https://discourse.julialang.org/t/gaussian-process-model-with-turing/42453)

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**Author:** [@kevbonham](https://discourse.julialang.org/u/kevbonham)\
**Replies:** 84\
**Last updated:** [November 28, 2020, 6:12pm UTC](https://discourse.julialang.org/t/gaussian-process-model-with-turing/42453 "2020-11-28T18:12:19Z")

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Is it possible to specifiy a Gaussian process (GP) regression model directly in Turing? I’ve looked at Stheno.jl and GaussianProcesses.jl, but neither have an obvious way to specify a multivariate model (GaussianProcesse…

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## [Call Julia function with keywords from C++](https://discourse.julialang.org/t/call-julia-function-with-keywords-from-c/20981)

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**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 3\
**Last updated:** [November 28, 2020, 6:03pm UTC](https://discourse.julialang.org/t/call-julia-function-with-keywords-from-c/20981 "2020-11-28T18:03:03Z")

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Hi guys! Let’s say I have Julia function: function teste(a::Int,b::Int; c = 1.0, d = 1.0, e = 1.0) return (a+b)^(c+d+e) end How can I call it from C++ modifying the keyword d?

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## [Now() - Date(2020) errors](https://discourse.julialang.org/t/now-date-2020-errors/50890)

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**Author:** [@sambitdash](https://discourse.julialang.org/u/sambitdash)\
**Replies:** 10\
**Last updated:** [November 28, 2020, 5:54pm UTC](https://discourse.julialang.org/t/now-date-2020-errors/50890 "2020-11-28T17:54:39Z")

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Hi All, I am seeing the following behavior with Julia 1.5.2 with Win64. julia\> now() - Date(2020) MethodError: no method matching -(::DateTime, ::Date) Closest candidates are: -(::DateTime, !Matched::Month) at D:\\bui…

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## [Function composition and piping,function name color hightlight in IDE's](https://discourse.julialang.org/t/function-composition-and-piping-function-name-color-hightlight-in-ides/50901)

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**Author:** [@rapasite](https://discourse.julialang.org/u/rapasite)\
**Replies:** 2\
**Last updated:** [November 28, 2020, 4:39pm UTC](https://discourse.julialang.org/t/function-composition-and-piping-function-name-color-hightlight-in-ides/50901 "2020-11-28T16:39:31Z")

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Hi, any reasons the name of functions are only highlight (colored) when putting the parenthesis on vscode or juno? It is not like I can define a variable with the same name as an already define function anyway. I will …

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## [Error in setting a for loop](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891)

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**Author:** [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)\
**Replies:** 3\
**Last updated:** [November 28, 2020, 1:58pm UTC](https://discourse.julialang.org/t/error-in-setting-a-for-loop/50891 "2020-11-28T13:58:33Z")

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Hello, I am setting a for loop but I am getting an error: epsilon = 1 omega = 0.05 tau = 2.392731385751533 mu = 0.72 p = \[epsilon, omega, tau, mu\] for x in \[0.0:0.1:1.0e9\] println(x) y = …

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## [What are those artifacts?](https://discourse.julialang.org/t/what-are-those-artifacts/50893)

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**Author:** [@CodeLenz](https://discourse.julialang.org/u/CodeLenz)\
**Replies:** 2\
**Last updated:** [November 28, 2020, 1:09pm UTC](https://discourse.julialang.org/t/what-are-those-artifacts/50893 "2020-11-28T13:09:24Z")

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Hi There are a lot of artifacts like Xorg\_xcb\_\* being installed and updated when I do \]update. How can I learn more about these? Is there some reference about its need and adoption? Thanks in advance!

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## [Constant time Gaussian and Bilateral filter](https://discourse.julialang.org/t/constant-time-gaussian-and-bilateral-filter/50867)

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**Author:** [@Geoffrey](https://discourse.julialang.org/u/Geoffrey)\
**Replies:** 5\
**Last updated:** [November 28, 2020, 12:47pm UTC](https://discourse.julialang.org/t/constant-time-gaussian-and-bilateral-filter/50867 "2020-11-28T12:47:47Z")

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Hi, I’m still learning the julia language and to do so I try to implement different published algorithms that I found useful for my work (I’m a biologist and I do a lot of image analysis). So I have an implementation of…

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## [ParameterizedFunctions for setting up systems of ODEs](https://discourse.julialang.org/t/parameterizedfunctions-for-setting-up-systems-of-odes/50849)

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**Author:** [@Peter-Jolly](https://discourse.julialang.org/u/Peter-Jolly)\
**Replies:** 11\
**Last updated:** [November 28, 2020, 7:43am UTC](https://discourse.julialang.org/t/parameterizedfunctions-for-setting-up-systems-of-odes/50849 "2020-11-28T07:43:20Z")

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Hi, I am trying out an example to set up a system of ODE’s for solution using the ParameterizedFunctions package - looks quite useful. I keep getting an error and could do with some help. It seems the set of the method …

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## [BigFloat loses precision on simple operations](https://discourse.julialang.org/t/bigfloat-loses-precision-on-simple-operations/50588)

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**Author:** [@Sharath\_Gururaj](https://discourse.julialang.org/u/Sharath_Gururaj)\
**Replies:** 4\
**Last updated:** [November 28, 2020, 7:36am UTC](https://discourse.julialang.org/t/bigfloat-loses-precision-on-simple-operations/50588 "2020-11-28T07:36:00Z")

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Consider the following operation, effectively raising 1.0003 to the zeroth power, which should give 1 to high precision. But the output answer is correct only to 2 digits. What am I doing wrong? setprecision(BigFloat, 2…

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## [Change default JULIA Path Manually in Ubuntu](https://discourse.julialang.org/t/change-default-julia-path-manually-in-ubuntu/50842)

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**Author:** [@clement](https://discourse.julialang.org/u/clement)\
**Replies:** 20\
**Last updated:** [November 28, 2020, 7:03am UTC](https://discourse.julialang.org/t/change-default-julia-path-manually-in-ubuntu/50842 "2020-11-28T07:03:45Z")

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I have managed to locally install a latest Julia (version 1.5.2) locally on an Ubuntu SuperComputer into a folder I created called Julia\_folder . I am able to use Julia within this folder. But my challenge is the system …

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## [Network application framework in Julia (i.e. netty, NIO, MINA)](https://discourse.julialang.org/t/network-application-framework-in-julia-i-e-netty-nio-mina/50889)

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**Author:** [@mks](https://discourse.julialang.org/u/mks)\
**Replies:** 0\
**Last updated:** [November 28, 2020, 6:24am UTC](https://discourse.julialang.org/t/network-application-framework-in-julia-i-e-netty-nio-mina/50889 "2020-11-28T06:24:19Z")

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Hello, is there work going on to come up with a network application framework in Julia like netty, NIO, MINA? https://netty.io/ It would be nice to be able to use gRPC and Protobuf. I know there is protobuf.jl which …

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## [Error while using ModelingToolkit](https://discourse.julialang.org/t/error-while-using-modelingtoolkit/50881)

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**Author:** [@contradict](https://discourse.julialang.org/u/contradict)\
**Replies:** 2\
**Last updated:** [November 28, 2020, 4:11am UTC](https://discourse.julialang.org/t/error-while-using-modelingtoolkit/50881 "2020-11-28T04:11:58Z")

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I am building a model of a pneumatic system with ModelingToolkit and have gotten stuck. I have a not-very-minimal example of the error in this gist. I haven’t been able to trim it down any more and preserve the error. H…

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## [Plotting differential equations solutions with varying color](https://discourse.julialang.org/t/plotting-differential-equations-solutions-with-varying-color/50884)

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**Author:** [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Replies:** 1\
**Last updated:** [November 28, 2020, 4:00am UTC](https://discourse.julialang.org/t/plotting-differential-equations-solutions-with-varying-color/50884 "2020-11-28T04:00:41Z")

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When plotting DifferentialEquations solutions, the plotdensity keyword does not seem to work together with line\_z. See code below where data interpolation within Plots does not take place, when we color the solution by t…

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## [Promotion, Multiple Dispatch, in example using temperature](https://discourse.julialang.org/t/promotion-multiple-dispatch-in-example-using-temperature/50843)

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**Author:** [@nero57](https://discourse.julialang.org/u/nero57)\
**Replies:** 6\
**Last updated:** [November 28, 2020, 12:27am UTC](https://discourse.julialang.org/t/promotion-multiple-dispatch-in-example-using-temperature/50843 "2020-11-28T00:27:46Z")

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Hello all, I’m trying to understand conversion, multiple dispatch, and promotion using a modified version of the example described in this blogpost. The post discusses multiple dispatch, promotion, and conversion using …

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## [Why not an even-harder scope?](https://discourse.julialang.org/t/why-not-an-even-harder-scope/50087)

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**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 29\
**Last updated:** [November 27, 2020, 11:59pm UTC](https://discourse.julialang.org/t/why-not-an-even-harder-scope/50087 "2020-11-27T23:59:40Z")

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I know this is hardly the first post about scoping being “different” in different places (documented here), but I had a thought and couldn’t really find any post that addressed it. I’ll try to give a short recap: versio…

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## [How to get components of vector solution in Gridap](https://discourse.julialang.org/t/how-to-get-components-of-vector-solution-in-gridap/50882)

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**Author:** [@jmura](https://discourse.julialang.org/u/jmura)\
**Replies:** 0\
**Last updated:** [November 27, 2020, 11:43pm UTC](https://discourse.julialang.org/t/how-to-get-components-of-vector-solution-in-gridap/50882 "2020-11-27T23:43:25Z")

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Dear Julia users, I’m using Gridap, and I’m learning from the tutorials. I have some questions: a) How can we recover x- or y-components from a numerical solution uh, as the solution to linear elasticity (like in the t…

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## [Number of values in an array above a threshold](https://discourse.julialang.org/t/number-of-values-in-an-array-above-a-threshold/2167)

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**Author:** [@Andrea\_Tersigni](https://discourse.julialang.org/u/Andrea_Tersigni)\
**Replies:** 20\
**Last updated:** [November 27, 2020, 11:05pm UTC](https://discourse.julialang.org/t/number-of-values-in-an-array-above-a-threshold/2167 "2020-11-27T23:05:22Z")

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Hello I’m new to Julia and

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## [K-Medoids in Julia - Results Quality](https://discourse.julialang.org/t/k-medoids-in-julia-results-quality/50687)

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**Author:** [@mthelm85](https://discourse.julialang.org/u/mthelm85)\
**Replies:** 7\
**Last updated:** [November 27, 2020, 9:54pm UTC](https://discourse.julialang.org/t/k-medoids-in-julia-results-quality/50687 "2020-11-27T21:54:05Z")

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I was reading the Wikipedia page on k-medoids clustering and in the Software section, it’s stated that: Julia contains a k-medoid implementation of the k-means style algorithm (faster, but much worse result quality) i…

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## [VSC extension is showing "micro hangings" (on Windows)](https://discourse.julialang.org/t/vsc-extension-is-showing-micro-hangings-on-windows/50844)

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**Author:** [@joa-quim](https://discourse.julialang.org/u/joa-quim)\
**Replies:** 0\
**Last updated:** [November 27, 2020, 1:01am UTC](https://discourse.julialang.org/t/vsc-extension-is-showing-micro-hangings-on-windows/50844 "2020-11-27T01:01:10Z")

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I am noticing that VSC randomly hangs for nearly a second and then continues. When that happens the task manager shows very high core activity (\> 50 %). Only me?

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## [Repeatedly calculating likelihood using Turing](https://discourse.julialang.org/t/repeatedly-calculating-likelihood-using-turing/50608)

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**Author:** [@ArnoStrouwen](https://discourse.julialang.org/u/ArnoStrouwen)\
**Replies:** 2\
**Last updated:** [November 27, 2020, 8:56pm UTC](https://discourse.julialang.org/t/repeatedly-calculating-likelihood-using-turing/50608 "2020-11-27T20:56:36Z")

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I want to repeatedly calculate likelihoods of the same Turing model at different parameter values, and also with different possible observations. What is the best way to do this in Turing? A minimal example of the type o…

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## [Weird behavior using Jupyter and Gridap/GridapMakie](https://discourse.julialang.org/t/weird-behavior-using-jupyter-and-gridap-gridapmakie/50875)

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**Author:** [@jmura](https://discourse.julialang.org/u/jmura)\
**Replies:** 0\
**Last updated:** [November 27, 2020, 7:53pm UTC](https://discourse.julialang.org/t/weird-behavior-using-jupyter-and-gridap-gridapmakie/50875 "2020-11-27T19:53:43Z")

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Dear All, I’m using Julia 1.5.0 and Gridap v0.13.4 in Windows 10, and I was replicating the elasticity tutorial in Jupyter to learn how it works. Here is the code snippet: using Gridap # Creating a grid as the mesh n …

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## [Workflow for hosting "data" packages with artifacts](https://discourse.julialang.org/t/workflow-for-hosting-data-packages-with-artifacts/50868)

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**Author:** [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)\
**Replies:** 3\
**Last updated:** [November 27, 2020, 4:47pm UTC](https://discourse.julialang.org/t/workflow-for-hosting-data-packages-with-artifacts/50868 "2020-11-27T16:47:55Z")

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There seems to be broad consensus that using artifacts is the preferred way of hosting data for a package. Say, hypothetically, I were to make a package which makes it easier for users to download datasets from Hayashi’s…

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## [JLD2 Type Reconstruction: Getting an Instance for an arbitrary Type](https://discourse.julialang.org/t/jld2-type-reconstruction-getting-an-instance-for-an-arbitrary-type/50850)

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**Author:** [@JonasIsensee](https://discourse.julialang.org/u/JonasIsensee)\
**Replies:** 2\
**Last updated:** [November 27, 2020, 3:37pm UTC](https://discourse.julialang.org/t/jld2-type-reconstruction-getting-an-instance-for-an-arbitrary-type/50850 "2020-11-27T15:37:31Z")

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Hi all, I recently tagged the v0.3.0 release for JLD2 that changed the internals to allow for defining custom serialization. Annoyingly I introduced a bug in the process. Previously type instantiation was done within…

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