# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1859

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

**Page:** 1860

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## [Which package do you find the best for Object detection?](https://discourse.julialang.org/t/which-package-do-you-find-the-best-for-object-detection/32438)

<div class="topic-metadata">

**Author:** [@alirezamecheng](https://discourse.julialang.org/u/alirezamecheng)\
**Replies:** 1\
**Last updated:** [December 19, 2019, 1:06pm UTC](https://discourse.julialang.org/t/which-package-do-you-find-the-best-for-object-detection/32438 "2019-12-19T13:06:29Z")

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Hello, I’m new to machine learning especially to the subject of Object Detection. If you don’t mind can you please share your experience with me and name a good package to start with? I’m really confused about the diffe…

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## [Update Project.toml manually](https://discourse.julialang.org/t/update-project-toml-manually/32477)

<div class="topic-metadata">

**Author:** [@Johncowk](https://discourse.julialang.org/u/Johncowk)\
**Replies:** 1\
**Last updated:** [December 19, 2019, 1:01pm UTC](https://discourse.julialang.org/t/update-project-toml-manually/32477 "2019-12-19T13:01:43Z")

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Hello, I was trying to update an old package that I wrote in order to be able to register it and run gen\_package.jl as described in the Pkg doc and suppressed my REQUIRE file. The problem is now that I have made further…

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## [Are functions the same as closures in this case?](https://discourse.julialang.org/t/are-functions-the-same-as-closures-in-this-case/32467)

<div class="topic-metadata">

**Author:** [@rvignolo](https://discourse.julialang.org/u/rvignolo)\
**Replies:** 8\
**Last updated:** [December 19, 2019, 12:28pm UTC](https://discourse.julialang.org/t/are-functions-the-same-as-closures-in-this-case/32467 "2019-12-19T12:28:10Z")

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Are these functions/closures examples: function main() a = 1.0 b = 5.0 function f1(t) return a \* t + b end f2(t) = a \* t + b f3 = t -\> a \* t + b solver(f1, f2, f3) return nothing end the same w…

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## [\[Example\] Use automatic differentiation to find Lagrange multiplier](https://discourse.julialang.org/t/example-use-automatic-differentiation-to-find-lagrange-multiplier/32476)

<div class="topic-metadata">

**Author:** [@timueh](https://discourse.julialang.org/u/timueh)\
**Replies:** 2\
**Last updated:** [December 19, 2019, 12:11pm UTC](https://discourse.julialang.org/t/example-use-automatic-differentiation-to-find-lagrange-multiplier/32476 "2019-12-19T12:11:25Z")

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Hi there, this post is about a toy example that explores whether and how automatic differentiation (AD) can be used to determine Lagrange multipliers. Setup Take the following toy problem f(\\varepsilon) = \\underset{x\_…

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## [Handle differential equations with size varying state vector](https://discourse.julialang.org/t/handle-differential-equations-with-size-varying-state-vector/32377)

<div class="topic-metadata">

**Author:** [@mleprovost](https://discourse.julialang.org/u/mleprovost)\
**Replies:** 2\
**Last updated:** [December 19, 2019, 9:54am UTC](https://discourse.julialang.org/t/handle-differential-equations-with-size-varying-state-vector/32377 "2019-12-19T09:54:20Z")

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Hello, I am working on time marching of ODEs with size varying state vector. I would like to use the integrator interface of DifferentialEquations to do so. Here is a toy problem with the error. du is computed based on…

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## [Reviving WebDriver.jl](https://discourse.julialang.org/t/reviving-webdriver-jl/32468)

<div class="topic-metadata">

**Author:** [@Nosferican](https://discourse.julialang.org/u/Nosferican)\
**Replies:** 1\
**Last updated:** [December 19, 2019, 9:42am UTC](https://discourse.julialang.org/t/reviving-webdriver-jl/32468 "2019-12-19T09:42:12Z")

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I am pleased to share my initial draft towards reviving WebDriver.jl for Julia v1 at The package allows to interact with a remote web driver and covers most of the implementation in the current Selenium WebDriver proje…

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## [Can we exploit binary builder as a general way to distribute softwares?](https://discourse.julialang.org/t/can-we-exploit-binary-builder-as-a-general-way-to-distribute-softwares/32472)

<div class="topic-metadata">

**Author:** [@innerlee](https://discourse.julialang.org/u/innerlee)\
**Replies:** 1\
**Last updated:** [December 19, 2019, 7:48am UTC](https://discourse.julialang.org/t/can-we-exploit-binary-builder-as-a-general-way-to-distribute-softwares/32472 "2019-12-19T07:48:23Z")

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Often one may have a clean server without root. Building everything from source is okay but I recently found the treasure of binary builder artifacts at https://github.com/JuliaBinaryWrappers. I wrote an install script f…

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## [What are your most coveted functionalities missing in the ecosystem?](https://discourse.julialang.org/t/what-are-your-most-coveted-functionalities-missing-in-the-ecosystem/26962)

<div class="topic-metadata">

**Author:** [@Nosferican](https://discourse.julialang.org/u/Nosferican)\
**Replies:** 55\
**Last updated:** [December 19, 2019, 5:21am UTC](https://discourse.julialang.org/t/what-are-your-most-coveted-functionalities-missing-in-the-ecosystem/26962 "2019-12-19T05:21:32Z")

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Some of the things I would love that the Julia ecosystem gets are: Selenium WebDriver (WebDriver.jl, last updated 2016-08-30) Leafletjs (Leaflet.jl, last updated 2018-03-13) Panel and temporal context for StatsMo…

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## [Julia 1.3 manual not downloadable as PDF](https://discourse.julialang.org/t/julia-1-3-manual-not-downloadable-as-pdf/32346)

<div class="topic-metadata">

**Author:** [@aerdely](https://discourse.julialang.org/u/aerdely)\
**Replies:** 2\
**Last updated:** [December 19, 2019, 5:16am UTC](https://discourse.julialang.org/t/julia-1-3-manual-not-downloadable-as-pdf/32346 "2019-12-19T05:16:50Z")

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The following link does not work for me: https://raw.githubusercontent.com/JuliaLang/docs.julialang.org/assets/julia-1.3.0.pdf I get the message 404: Not Found Any suggestions?

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## [Get function object from method](https://discourse.julialang.org/t/get-function-object-from-method/6524)

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**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 7\
**Last updated:** [December 19, 2019, 4:04am UTC](https://discourse.julialang.org/t/get-function-object-from-method/6524 "2019-12-19T04:04:11Z")

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Given a Method object, how do I get the function it implements? eval(method.module, method.name) works, but it doesn’t look all that reliable.

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## [Can a function returns a partial function?](https://discourse.julialang.org/t/can-a-function-returns-a-partial-function/32413)

<div class="topic-metadata">

**Author:** [@tog](https://discourse.julialang.org/u/tog)\
**Replies:** 13\
**Last updated:** [December 19, 2019, 1:50am UTC](https://discourse.julialang.org/t/can-a-function-returns-a-partial-function/32413 "2019-12-19T01:50:05Z")

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Hi, I am new to Julia coming from Python. In Python we have the “partial” function that allow to derive a function by fixing some arguments. Can we do something similar in Julia? I would like to do something like: fun…

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## [Changing missing logic](https://discourse.julialang.org/t/changing-missing-logic/32449)

<div class="topic-metadata">

**Author:** [@tbeason](https://discourse.julialang.org/u/tbeason)\
**Replies:** 6\
**Last updated:** [December 18, 2019, 8:45pm UTC](https://discourse.julialang.org/t/changing-missing-logic/32449 "2019-12-18T20:45:30Z")

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I really like to use missing, but there are some instances where it becomes annoying. First, logical indexing. Second, when a package hasn’t implemented a safety method f(missing)=missing. For example, suppose I read in…

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## [A Julia-compatible alternative to zarr](https://discourse.julialang.org/t/a-julia-compatible-alternative-to-zarr/11842)

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**Author:** [@fabiangans](https://discourse.julialang.org/u/fabiangans)\
**Replies:** 19\
**Last updated:** [December 18, 2019, 8:17pm UTC](https://discourse.julialang.org/t/a-julia-compatible-alternative-to-zarr/11842 "2019-12-18T20:17:12Z")

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Dear Julia community, we are looking for a object-storage compatible file format for quite large dense N-dimensional arrays. Our project partners suggested this Zarr — zarr 2.13.6 documentation format, but there seems t…

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## [Creating a math website based on Julia](https://discourse.julialang.org/t/creating-a-math-website-based-on-julia/32448)

<div class="topic-metadata">

**Author:** [@chakravala](https://discourse.julialang.org/u/chakravala)\
**Replies:** 3\
**Last updated:** [December 18, 2019, 8:10pm UTC](https://discourse.julialang.org/t/creating-a-math-website-based-on-julia/32448 "2019-12-18T20:10:50Z")

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Recently, I have been making some nice webpages with the Julia Documenter and \\LaTeX. I also have a WordPress based website, which I am thinking of replacing with a Julia generated. What are the different options out t…

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## [Julia style? Arrays/matrix vs structs](https://discourse.julialang.org/t/julia-style-arrays-matrix-vs-structs/32424)

<div class="topic-metadata">

**Author:** [@dlakelan](https://discourse.julialang.org/u/dlakelan)\
**Replies:** 19\
**Last updated:** [December 18, 2019, 8:08pm UTC](https://discourse.julialang.org/t/julia-style-arrays-matrix-vs-structs/32424 "2019-12-18T20:08:33Z")

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Suppose I want to write a simulation of a bunch of particles interacting. I could for example represent them in an array of say 3x1000 floats for position and another for velocity. Maybe a third array would have some ide…

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## [Creating a function from a subset of the methods of another function](https://discourse.julialang.org/t/creating-a-function-from-a-subset-of-the-methods-of-another-function/32403)

<div class="topic-metadata">

**Author:** [@longemen3000](https://discourse.julialang.org/u/longemen3000)\
**Replies:** 7\
**Last updated:** [December 18, 2019, 6:10pm UTC](https://discourse.julialang.org/t/creating-a-function-from-a-subset-of-the-methods-of-another-function/32403 "2019-12-18T18:10:32Z")

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lets say i have a function f with a lot methods: julia\>methods(f) #invented output \[1\] f(x::Int64, y::Int64) in PackageA at \\.julia\\packages\\PackageA\\yPcDQ\\src\\functions.jl:43 \[2\] f(x::Float64, y::Float64) in Main at RE…

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## [Different behaviour during debugging and execution](https://discourse.julialang.org/t/different-behaviour-during-debugging-and-execution/32379)

<div class="topic-metadata">

**Author:** [@Volker](https://discourse.julialang.org/u/Volker)\
**Replies:** 5\
**Last updated:** [December 18, 2019, 5:20pm UTC](https://discourse.julialang.org/t/different-behaviour-during-debugging-and-execution/32379 "2019-12-18T17:20:05Z")

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Somehow I get a different behaviour of the following code, but I don´t know why. As you can see from the REPL output during debugging the for-loop was executed successfully, but during execution not. Does somebody have …

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## [Scope when using multiple modules](https://discourse.julialang.org/t/scope-when-using-multiple-modules/32344)

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**Author:** [@urp](https://discourse.julialang.org/u/urp)\
**Replies:** 2\
**Last updated:** [December 18, 2019, 5:00pm UTC](https://discourse.julialang.org/t/scope-when-using-multiple-modules/32344 "2019-12-18T17:00:17Z")

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I am new at using Julia. I am writing a PDE solver. I would like to have a struct that stores all mesh/simulation variables that could then be accessed from other modules in my code. However, I am having some trouble wit…

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## [Face this run time error](https://discourse.julialang.org/t/face-this-run-time-error/32418)

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**Author:** [@imrankhan\_juliaLang](https://discourse.julialang.org/u/imrankhan_juliaLang)\
**Replies:** 3\
**Last updated:** [December 18, 2019, 4:34pm UTC](https://discourse.julialang.org/t/face-this-run-time-error/32418 "2019-12-18T16:34:46Z")

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I face this error in MJL pakage

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## [User-defined functions with large vector inputs](https://discourse.julialang.org/t/user-defined-functions-with-large-vector-inputs/32434)

<div class="topic-metadata">

**Author:** [@edljk](https://discourse.julialang.org/u/edljk)\
**Replies:** 4\
**Last updated:** [December 18, 2019, 3:40pm UTC](https://discourse.julialang.org/t/user-defined-functions-with-large-vector-inputs/32434 "2019-12-18T15:40:39Z")

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JuMP documentation suggest to use splatting for user-defined functions with vector inputs. For medium size data this works pretty well but for large scale vectors I encounter a memory issue: julia\> f(x...) = sum(x\[i\] fo…

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## [Equivalent Function to licols in Matlab](https://discourse.julialang.org/t/equivalent-function-to-licols-in-matlab/32445)

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**Author:** [@jmcastro2109](https://discourse.julialang.org/u/jmcastro2109)\
**Replies:** 2\
**Last updated:** [December 18, 2019, 3:00pm UTC](https://discourse.julialang.org/t/equivalent-function-to-licols-in-matlab/32445 "2019-12-18T15:00:00Z")

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Hello, I wonder whether Julia has a function to remove (or identify) the columns of a matrix that are linearly dependent similar as the licols does in Matlab.

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## [\[ANN\] GitCommand.jl: use command-line Git in your Julia packages](https://discourse.julialang.org/t/ann-gitcommand-jl-use-command-line-git-in-your-julia-packages/32330)

<div class="topic-metadata">

**Author:** [@dilumaluthge](https://discourse.julialang.org/u/dilumaluthge)\
**Replies:** 11\
**Last updated:** [December 18, 2019, 1:57pm UTC](https://discourse.julialang.org/t/ann-gitcommand-jl-use-command-line-git-in-your-julia-packages/32330 "2019-12-18T13:57:21Z")

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I’m pleased to announce the new package GitCommand.jl. GitCommand allows you to use command-line Git in your Julia packages. You do not need to have Git installed on your computer, and neither do the users of your packa…

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## [Some help with ArrayFire + DifferentialEquations](https://discourse.julialang.org/t/some-help-with-arrayfire-differentialequations/32342)

<div class="topic-metadata">

**Author:** [@Noel\_Araujo](https://discourse.julialang.org/u/Noel_Araujo)\
**Replies:** 20\
**Last updated:** [December 18, 2019, 1:50pm UTC](https://discourse.julialang.org/t/some-help-with-arrayfire-differentialequations/32342 "2019-12-18T13:50:47Z")

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Hellos, I noticed that with one line definition for ArrayFire.jl I can make it run together with DifferentialEquations.jl, but it is not working as expected. DifferentialEquations is calling a generic multiplication fu…

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## [Julia 1.3 selection of datafarme's column with :Col is deprecated](https://discourse.julialang.org/t/julia-1-3-selection-of-datafarmes-column-with-col-is-deprecated/32430)

<div class="topic-metadata">

**Author:** [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)\
**Replies:** 5\
**Last updated:** [December 18, 2019, 12:58pm UTC](https://discourse.julialang.org/t/julia-1-3-selection-of-datafarmes-column-with-col-is-deprecated/32430 "2019-12-18T12:58:39Z")

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Hello, I recently upgraded to Julia 1.3. Before I was using df\[:Column\] to select a dataframe’s column, but now I get the error: Julia \> Warning: getindex(df::DataFrame, col\_ind::ColumnIndex)is deprecated, usedf\[!, col…

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## [How to setup Julia & Flux with CUDA & cuDNN on a computing cluster?](https://discourse.julialang.org/t/how-to-setup-julia-flux-with-cuda-cudnn-on-a-computing-cluster/30165)

<div class="topic-metadata">

**Author:** [@Massimiliano\_Comin](https://discourse.julialang.org/u/Massimiliano_Comin)\
**Replies:** 9\
**Last updated:** [December 18, 2019, 12:48pm UTC](https://discourse.julialang.org/t/how-to-setup-julia-flux-with-cuda-cudnn-on-a-computing-cluster/30165 "2019-12-18T12:48:20Z")

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Hello, I recently switched to Julia from Python for both Deep Learning and scientific computing. I use a national cluster for my calculations, where Julia 1.0.3 is installed as well as CUDA 10.1.105. I’d like to set up …

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## [A list of plots as an argument for the plot-command of Plots.jl](https://discourse.julialang.org/t/a-list-of-plots-as-an-argument-for-the-plot-command-of-plots-jl/32433)

<div class="topic-metadata">

**Author:** [@Volker](https://discourse.julialang.org/u/Volker)\
**Replies:** 2\
**Last updated:** [December 18, 2019, 10:48am UTC](https://discourse.julialang.org/t/a-list-of-plots-as-an-argument-for-the-plot-command-of-plots-jl/32433 "2019-12-18T10:48:25Z")

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If you consider the following code, you will get a list of plots. using Plots plotly() var\_names = \["var1", "var2", "var3"\] # initialize regression matrices for training, validation and test X1 = rand(20, 3) X2 = r…

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## [KNITRO 'option\_file' is not working](https://discourse.julialang.org/t/knitro-option-file-is-not-working/32410)

<div class="topic-metadata">

**Author:** [@SingingKim](https://discourse.julialang.org/u/SingingKim)\
**Replies:** 3\
**Last updated:** [December 18, 2019, 8:32am UTC](https://discourse.julialang.org/t/knitro-option-file-is-not-working/32410 "2019-12-18T08:32:24Z")

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Hi all, I’m trying to pass an option file to KNITRO solver and it gives me the following error: using JuMP, KNITRO m = Model(with\_optimizer(KNITRO.Optimizer, option\_file="knitro.opt")) ERROR: MathOptInterface.Unsuppor…

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## [How to run Julia in Android Studio](https://discourse.julialang.org/t/how-to-run-julia-in-android-studio/32426)

<div class="topic-metadata">

**Author:** [@William\_willson](https://discourse.julialang.org/u/William_willson)\
**Replies:** 3\
**Last updated:** [December 18, 2019, 8:32am UTC](https://discourse.julialang.org/t/how-to-run-julia-in-android-studio/32426 "2019-12-18T08:32:01Z")

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I want to use Julia for app development so anyone can help me in that to use it

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## [The same network performs differently in Flux.jl and tensorflow](https://discourse.julialang.org/t/the-same-network-performs-differently-in-flux-jl-and-tensorflow/28378)

<div class="topic-metadata">

**Author:** [@zhangqian](https://discourse.julialang.org/u/zhangqian)\
**Replies:** 13\
**Last updated:** [December 18, 2019, 8:12am UTC](https://discourse.julialang.org/t/the-same-network-performs-differently-in-flux-jl-and-tensorflow/28378 "2019-12-18T08:12:46Z")

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Hi, I am writing a toy model to test the performance of Flux.jl. I generated some dummy data with the following code import numpy as np traindata=np.random.random((10000,50)) target=np.random.random(10000) np.savetxt…

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## [Counting number of occurences in an array](https://discourse.julialang.org/t/counting-number-of-occurences-in-an-array/31613)

<div class="topic-metadata">

**Author:** [@WEEZEERAE](https://discourse.julialang.org/u/WEEZEERAE)\
**Replies:** 10\
**Last updated:** [December 18, 2019, 7:33am UTC](https://discourse.julialang.org/t/counting-number-of-occurences-in-an-array/31613 "2019-12-18T07:33:39Z")

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Hey people, I’m struggling with the following problem: I want to count the number of occurances for the values in an array, s.t. I can plot the result. I.e. this is the array: A = \[1,2,3,3,4,4,4,6\] and I want to fin…

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