# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1451

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

**Page:** 1452

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## [Unable to install InteractiveDynamics package](https://discourse.julialang.org/t/unable-to-install-interactivedynamics-package/57661)

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**Author:** [@Ola\_Megahed](https://discourse.julialang.org/u/Ola_Megahed)\
**Replies:** 5\
**Last updated:** [March 21, 2021, 8:36pm UTC](https://discourse.julialang.org/t/unable-to-install-interactivedynamics-package/57661 "2021-03-21T20:36:54Z")

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I am trying to use the “InteractiveDynamics” package for Visualizing Agents model in Julia 1.5.3. using this code: using Agents using Random using AbstractPlotting using GLMakie using CairoMakie using MakieGallery …

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## [Efficient Nash Equilibria using JuMP](https://discourse.julialang.org/t/efficient-nash-equilibria-using-jump/57616)

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**Author:** [@Ian\_Slagle](https://discourse.julialang.org/u/Ian_Slagle)\
**Replies:** 5\
**Last updated:** [March 21, 2021, 8:31pm UTC](https://discourse.julialang.org/t/efficient-nash-equilibria-using-jump/57616 "2021-03-21T20:31:19Z")

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Previously I have been using LRSLib (which calls the C library lrsnash) for computing Nash equilibria of two-player simultaneous move zero-sum games. However, I wanted to implement a pure Julia implementation for the sak…

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## [PyCall / RCall in notebook showing graph displayed by the other language?](https://discourse.julialang.org/t/pycall-rcall-in-notebook-showing-graph-displayed-by-the-other-language/57624)

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**Author:** [@StatisticalMouse](https://discourse.julialang.org/u/StatisticalMouse)\
**Replies:** 3\
**Last updated:** [March 21, 2021, 8:13pm UTC](https://discourse.julialang.org/t/pycall-rcall-in-notebook-showing-graph-displayed-by-the-other-language/57624 "2021-03-21T20:13:48Z")

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Is it possible to call for instance ggplot2 in R, and have the graph be shown in a Julia Jupyter notebook? Any example code somewhere?

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## [GraphDB packages or solutions](https://discourse.julialang.org/t/graphdb-packages-or-solutions/57561)

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**Author:** [@zgornel](https://discourse.julialang.org/u/zgornel)\
**Replies:** 6\
**Last updated:** [March 21, 2021, 7:38pm UTC](https://discourse.julialang.org/t/graphdb-packages-or-solutions/57561 "2021-03-21T19:38:46Z")

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Is there any graphdb-like package that allows for more complex pattern queries and sub-graph retrieval (similar to neo4j’s or grakn’s). Metagraphs+Lightgraphs is the only thing I have found so far.

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## [Pluto.jl throws a multiple assigning error when trying to change the values of a variable](https://discourse.julialang.org/t/pluto-jl-throws-a-multiple-assigning-error-when-trying-to-change-the-values-of-a-variable/57665)

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**Author:** [@oo92](https://discourse.julialang.org/u/oo92)\
**Replies:** 1\
**Last updated:** [March 21, 2021, 7:28pm UTC](https://discourse.julialang.org/t/pluto-jl-throws-a-multiple-assigning-error-when-trying-to-change-the-values-of-a-variable/57665 "2021-03-21T19:28:08Z")

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In Python, if you have a variable numbers = 5 and then in the next like you write numbers = 55 , the variable’s value is updated. While using Pluto.jl, I declared a variable called y\_axis . I decided to change the value…

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## [Upload an Arduino sketch from Julia](https://discourse.julialang.org/t/upload-an-arduino-sketch-from-julia/57452)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 6\
**Last updated:** [March 21, 2021, 7:26pm UTC](https://discourse.julialang.org/t/upload-an-arduino-sketch-from-julia/57452 "2021-03-21T19:26:46Z")

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To upload a sketch (i.e. an .ino file) to an Arduino I normally just use the Arduino IDE. But it would be amazing if there was a way to do this from Julia. Ideally, this would involve some wrapped binary that would work …

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## [Functions in Type Declarations](https://discourse.julialang.org/t/functions-in-type-declarations/57632)

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**Author:** [@andenrx](https://discourse.julialang.org/u/andenrx)\
**Replies:** 5\
**Last updated:** [March 21, 2021, 6:17pm UTC](https://discourse.julialang.org/t/functions-in-type-declarations/57632 "2021-03-21T18:17:45Z")

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Is there anyway to call functions in type declarations? For example, something like struct ChildParent{T} child::Type{T} parent::Type{supertype{T}} end This throws MethodError: no method matching supertype(::T…

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## [What is the best visualization for seeing changes in distribution over time in hierarchical data?](https://discourse.julialang.org/t/what-is-the-best-visualization-for-seeing-changes-in-distribution-over-time-in-hierarchical-data/57594)

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**Author:** [@NightMachinary](https://discourse.julialang.org/u/NightMachinary)\
**Replies:** 9\
**Last updated:** [March 21, 2021, 6:02pm UTC](https://discourse.julialang.org/t/what-is-the-best-visualization-for-seeing-changes-in-distribution-over-time-in-hierarchical-data/57594 "2021-03-21T18:02:30Z")

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I am trying to find a good visualization for how how I spent my time is changing over time. I can visualize this data for a single interval very well with a sunburst or treemap chart: But visualizing the changes in t…

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## [Sparse matrix for ODE](https://discourse.julialang.org/t/sparse-matrix-for-ode/57646)

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**Author:** [@Manisha\_07](https://discourse.julialang.org/u/Manisha_07)\
**Replies:** 3\
**Last updated:** [March 21, 2021, 5:01pm UTC](https://discourse.julialang.org/t/sparse-matrix-for-ode/57646 "2021-03-21T17:01:58Z")

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Hello Pls give me knowledge on sparse matrix.Wat is its application in solving ODE

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## [Advanced Julia Tutorials](https://discourse.julialang.org/t/advanced-julia-tutorials/25633)

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**Author:** [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)\
**Replies:** 12\
**Last updated:** [March 21, 2021, 5:00pm UTC](https://discourse.julialang.org/t/advanced-julia-tutorials/25633 "2021-03-21T17:00:07Z")

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I have been able to find a wide range of “getting started” guides to Julia, but I am at a point where I would like to learn more advanced features, for example, designing systems leveraging multiple inheritance, macros, …

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## [\[ANN\] Flywheel: 1-D finite element tool for gyroscopic systems](https://discourse.julialang.org/t/ann-flywheel-1-d-finite-element-tool-for-gyroscopic-systems/57662)

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**Author:** [@LysandrosAn](https://discourse.julialang.org/u/LysandrosAn)\
**Replies:** 0\
**Last updated:** [March 21, 2021, 4:15pm UTC](https://discourse.julialang.org/t/ann-flywheel-1-d-finite-element-tool-for-gyroscopic-systems/57662 "2021-03-21T16:15:18Z")

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Hello together, this announces Flywheel on GitHub, a 1-D finite element tool for simulating gyroscopic equipment, such as satellite reaction wheels, laboratory centrifuges and kinetic energy storage devices. Feel free t…

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## [REPL-based workflow](https://discourse.julialang.org/t/repl-based-workflow/57629)

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**Author:** [@jaydub](https://discourse.julialang.org/u/jaydub)\
**Replies:** 9\
**Last updated:** [March 21, 2021, 3:48pm UTC](https://discourse.julialang.org/t/repl-based-workflow/57629 "2021-03-21T15:48:38Z")

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Coming from Common Lisp, using the Julia REPL is… well… frustrating. There’s no easy way to send a piece of code from a file to the REPL with its module namespace correctly recognized. I read https://docs.julialang.org/e…

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## [Help question with running Stan.jl in VSCode on Windows](https://discourse.julialang.org/t/help-question-with-running-stan-jl-in-vscode-on-windows/57571)

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**Author:** [@goedman](https://discourse.julialang.org/u/goedman)\
**Replies:** 10\
**Last updated:** [March 21, 2021, 3:17pm UTC](https://discourse.julialang.org/t/help-question-with-running-stan-jl-in-vscode-on-windows/57571 "2021-03-21T15:17:38Z")

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Hi, When I run below script in VSCode on Windows: using CmdStan, Statistics bm = " data { int\<lower=1\> N; int\<lower=0,upper=1\> y\[N\]; } parameters { real\<lower=0,upper=1\> theta; } model { t…

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## [Update Julia Package](https://discourse.julialang.org/t/update-julia-package/57645)

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**Author:** [@Manisha\_07](https://discourse.julialang.org/u/Manisha_07)\
**Replies:** 2\
**Last updated:** [March 21, 2021, 1:36pm UTC](https://discourse.julialang.org/t/update-julia-package/57645 "2021-03-21T13:36:51Z")

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whenever I am trying to install new package iam getting this msg again and again. Pls anyone help me to resolve this problem

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## [Does specifying the element type of a Channel impact performance?](https://discourse.julialang.org/t/does-specifying-the-element-type-of-a-channel-impact-performance/57653)

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**Author:** [@jishnub](https://discourse.julialang.org/u/jishnub)\
**Replies:** 2\
**Last updated:** [March 21, 2021, 1:19pm UTC](https://discourse.julialang.org/t/does-specifying-the-element-type-of-a-channel-impact-performance/57653 "2021-03-21T13:19:04Z")

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julia\> a = ones(2,2); julia\> ct = Channel{Matrix{Float64}}(1) Channel{Array{Float64,2}}(sz\_max:1,sz\_curr:0) julia\> @btime (put!($ct, $a); take!($ct);); 283.612 ns (0 allocations: 0 bytes) julia\> c = Channel{Any}(1);…

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## [Problem in importing the "ParameterizedFunctions"](https://discourse.julialang.org/t/problem-in-importing-the-parameterizedfunctions/57623)

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**Author:** [@Manisha\_07](https://discourse.julialang.org/u/Manisha_07)\
**Replies:** 5\
**Last updated:** [March 21, 2021, 1:15pm UTC](https://discourse.julialang.org/t/problem-in-importing-the-parameterizedfunctions/57623 "2021-03-21T13:15:33Z")

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Hello People I am trying to import “ParamatricFunctions” but iam finding the error . Pls find the error in . Please help me Thanks

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## [Newbie: Gradient of a gradient performance in Zygote](https://discourse.julialang.org/t/newbie-gradient-of-a-gradient-performance-in-zygote/57593)

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**Author:** [@roh\_codeur](https://discourse.julialang.org/u/roh_codeur)\
**Replies:** 2\
**Last updated:** [March 21, 2021, 12:10pm UTC](https://discourse.julialang.org/t/newbie-gradient-of-a-gradient-performance-in-zygote/57593 "2021-03-21T12:10:45Z")

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Hi I am a newbie to Julia. I am trying to implement a piece of code as below. I was wondering if there is a way to improve the performance of gradient of a gradient. Note: for simplicity, both x and y are the same arra…

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## [Julia reporting an extra ) when it doesn't exist](https://discourse.julialang.org/t/julia-reporting-an-extra-when-it-doesnt-exist/57644)

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**Author:** [@oo92](https://discourse.julialang.org/u/oo92)\
**Replies:** 6\
**Last updated:** [March 21, 2021, 8:50am UTC](https://discourse.julialang.org/t/julia-reporting-an-extra-when-it-doesnt-exist/57644 "2021-03-21T08:50:05Z")

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I have this for loop in Julia: for country in countries\_data\_labels new\_dataframe = get\_country(df, country) new\_dataframe = DataFrame(new\_dataframe) df\_rows, df\_columns = size(new\_dataframe)…

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## [Julia for real time, worried about the garbage collector](https://discourse.julialang.org/t/julia-for-real-time-worried-about-the-garbage-collector/34654)

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**Author:** [@gosim](https://discourse.julialang.org/u/gosim)\
**Replies:** 48\
**Last updated:** [March 21, 2021, 1:16am UTC](https://discourse.julialang.org/t/julia-for-real-time-worried-about-the-garbage-collector/34654 "2021-03-21T01:16:35Z")

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Hello, totally new. I’ve read about Julia and the concept seems great. I have a block diagram software (like simulink) that automatically creates a script, works well and it is using m-code where every block is a functi…

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## [Singularity, ERROR: Unable to find compatible target in system image](https://discourse.julialang.org/t/singularity-error-unable-to-find-compatible-target-in-system-image/57619)

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**Author:** [@Perrin\_Meyer](https://discourse.julialang.org/u/Perrin_Meyer)\
**Replies:** 3\
**Last updated:** [March 21, 2021, 12:00am UTC](https://discourse.julialang.org/t/singularity-error-unable-to-find-compatible-target-in-system-image/57619 "2021-03-21T00:00:55Z")

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I’m trying to compile a Singularity container for running on a HPC cluster. My container works on my laptop (where I build it), but when I transfer it over to the cluster, I get a: ERROR: Unable to find compatible targ…

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## [Integrating Julia with Power BI](https://discourse.julialang.org/t/integrating-julia-with-power-bi/19185)

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**Author:** [@hasanOryx](https://discourse.julialang.org/u/hasanOryx)\
**Replies:** 1\
**Last updated:** [March 20, 2021, 11:31pm UTC](https://discourse.julialang.org/t/integrating-julia-with-power-bi/19185 "2021-03-20T23:31:28Z")

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Is there a way to integrate Julia lang with MS Power BI, knowing that Power Bi has R integration.

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## [How to use a forked Github project](https://discourse.julialang.org/t/how-to-use-a-forked-github-project/57360)

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**Author:** [@ultradian](https://discourse.julialang.org/u/ultradian)\
**Replies:** 2\
**Last updated:** [March 20, 2021, 11:12pm UTC](https://discourse.julialang.org/t/how-to-use-a-forked-github-project/57360 "2021-03-20T23:12:55Z")

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I am trying to use a fork of the Ogg package, but having problems. Ogg itself is easy to use as it is a registered package. The fork I want to use is https://github.com/ssfrr/Ogg.jl as ssfrr created a streaming branch th…

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## [Globe in Makie](https://discourse.julialang.org/t/globe-in-makie/57627)

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**Author:** [@gdkrmr](https://discourse.julialang.org/u/gdkrmr)\
**Replies:** 1\
**Last updated:** [March 20, 2021, 9:52pm UTC](https://discourse.julialang.org/t/globe-in-makie/57627 "2021-03-20T21:52:50Z")

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I am trying to reproduce the example from here but it doesn’t work with the current version of the packages. I am currently hanging at the following line: m = uv\_normal\_mesh(Tesselation(Sphere(Point3f0(0), 1f0), 200)) …

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## [Julia alignas: is there a way to specify the alignment of Julia objects in memory?](https://discourse.julialang.org/t/julia-alignas-is-there-a-way-to-specify-the-alignment-of-julia-objects-in-memory/57501)

<div class="topic-metadata">

**Author:** [@nsajko](https://discourse.julialang.org/u/nsajko)\
**Replies:** 15\
**Last updated:** [March 20, 2021, 10:25pm UTC](https://discourse.julialang.org/t/julia-alignas-is-there-a-way-to-specify-the-alignment-of-julia-objects-in-memory/57501 "2021-03-20T22:25:25Z")

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In C++ there is alignas (and related stuff like alignof): https://en.cppreference.com/w/cpp/language/alignas alignas enables specifying, for example, that an array’s storage should be aligned to 64 bytes in memory, whi…

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## [Return statements and global consts in a struct](https://discourse.julialang.org/t/return-statements-and-global-consts-in-a-struct/57567)

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**Author:** [@affans](https://discourse.julialang.org/u/affans)\
**Replies:** 5\
**Last updated:** [March 20, 2021, 10:17pm UTC](https://discourse.julialang.org/t/return-statements-and-global-consts-in-a-struct/57567 "2021-03-20T22:17:40Z")

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I posted this on Slack, but looking for some detailed answers. I recently saw a code snippet in Julia struct \_GLOBAL\_RNG \<: AbstractRNG global const GLOBAL\_RNG = \_GLOBAL\_RNG.instance end Jeff described this as basi…

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## [No method matching getindex](https://discourse.julialang.org/t/no-method-matching-getindex/57622)

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**Author:** [@SUMAN\_SHEKHAR](https://discourse.julialang.org/u/SUMAN_SHEKHAR)\
**Replies:** 4\
**Last updated:** [March 20, 2021, 8:34pm UTC](https://discourse.julialang.org/t/no-method-matching-getindex/57622 "2021-03-20T20:34:50Z")

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Greeting to all, I am new user to Julia and I was writing my code in Julia for the first time. I wanted to implement a Gaussian Heat surface over a circular radius and outside that radius I want to set the value to zero …

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## [Broadcasting over arrays of SVectors](https://discourse.julialang.org/t/broadcasting-over-arrays-of-svectors/57579)

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**Author:** [@lancejnelson](https://discourse.julialang.org/u/lancejnelson)\
**Replies:** 20\
**Last updated:** [March 20, 2021, 8:05pm UTC](https://discourse.julialang.org/t/broadcasting-over-arrays-of-svectors/57579 "2021-03-20T20:05:03Z")

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Can you use .= across an array of SVectors to reduce the number of allocations?

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## [TextAnalysis 0.7.2 - where to find SentimentAnalyzer()](https://discourse.julialang.org/t/textanalysis-0-7-2-where-to-find-sentimentanalyzer/57612)

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**Author:** [@julio.ca2020](https://discourse.julialang.org/u/julio.ca2020)\
**Replies:** 4\
**Last updated:** [March 20, 2021, 7:29pm UTC](https://discourse.julialang.org/t/textanalysis-0-7-2-where-to-find-sentimentanalyzer/57612 "2021-03-20T19:29:53Z")

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In the documentation for TextAnalysis 0.7.2, the function SentimentAnalyzer() is available. I do not find in the code. Where is it? What am I doing wrong? https://juliahub.com/docs/TextAnalysis/5Mwet/0.7.2/features/

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## [Usage of @ode\_def](https://discourse.julialang.org/t/usage-of-ode-def/57613)

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**Author:** [@Manisha\_07](https://discourse.julialang.org/u/Manisha_07)\
**Replies:** 1\
**Last updated:** [March 20, 2021, 5:32pm UTC](https://discourse.julialang.org/t/usage-of-ode-def/57613 "2021-03-20T17:32:31Z")

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Hello I am trying to use @ode\_def ,but i am getting error msg as “LoadError: UndefVarError: @ode\_def not defined in expression starting at In\[1\]:1” How would I resolve this issue…

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## [JuliaCon 2021 Call for Proposals (CFP) Office Hours | Come ask questions!](https://discourse.julialang.org/t/juliacon-2021-call-for-proposals-cfp-office-hours-come-ask-questions/57506)

<div class="topic-metadata">

**Author:** [@logankilpatrick](https://discourse.julialang.org/u/logankilpatrick)\
**Replies:** 1\
**Last updated:** [March 20, 2021, 3:50pm UTC](https://discourse.julialang.org/t/juliacon-2021-call-for-proposals-cfp-office-hours-come-ask-questions/57506 "2021-03-20T15:50:51Z")

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Announcement: we’re hosting the first ever “CFP office hours” this Saturday 3/20, 4pm UTC. If you have questions about the JuliaCon CFP or if are not sure if you should submit a proposal, come to this event and we’ll an…

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