# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1925

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

**Page:** 1926

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## [Transposed convolution aka deconvolution layer in Flux.jl](https://discourse.julialang.org/t/transposed-convolution-aka-deconvolution-layer-in-flux-jl/12142)

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**Author:** [@Azamat](https://discourse.julialang.org/u/Azamat)\
**Replies:** 1\
**Last updated:** [September 6, 2019, 8:19pm UTC](https://discourse.julialang.org/t/transposed-convolution-aka-deconvolution-layer-in-flux-jl/12142 "2019-09-06T20:19:30Z")

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I would like to use deconvolutional layer (transposed convolution) in my network. How can this be done in Flux.jl? To be specific, it is described here: image processing - How does the unpooling and deconvolution work …

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## [Keyword arguments confustion](https://discourse.julialang.org/t/keyword-arguments-confustion/28470)

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**Author:** [@jasonsun0310](https://discourse.julialang.org/u/jasonsun0310)\
**Replies:** 4\
**Last updated:** [September 6, 2019, 7:45pm UTC](https://discourse.julialang.org/t/keyword-arguments-confustion/28470 "2019-09-06T19:45:35Z")

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function choose(a::Type{Val{:Gaussian},b::Type{Val{:Gamma}}; data::Any = nothing,comp::Any=nothing) print(1) And I want it to dispatch on symbols and I create the following shortcut const choose(a::Symbo…

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## [DARPA looks to propel parallelism with PAPPA](https://discourse.julialang.org/t/darpa-looks-to-propel-parallelism-with-pappa/28421)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 5:38pm UTC](https://discourse.julialang.org/t/darpa-looks-to-propel-parallelism-with-pappa/28421 "2019-09-06T17:38:27Z")

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https://t.co/iybdsybN0l PAPPA specifically seeks to fill the gap between programing frameworks that automate parallelism but lack the ability to scale and popular data science programming languages like Python and R th…

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## [How do I obtain the \`T\` values in a vector \`Vector{Union{Missing, T}}\`?](https://discourse.julialang.org/t/how-do-i-obtain-the-t-values-in-a-vector-vector-union-missing-t/28455)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 9\
**Last updated:** [September 6, 2019, 4:37pm UTC](https://discourse.julialang.org/t/how-do-i-obtain-the-t-values-in-a-vector-vector-union-missing-t/28455 "2019-09-06T16:37:22Z")

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Say I have a vector of billion length long and I want to retrieve the T-types values, and where it is missing, I want to replace it with ANY value. E.g. x = \[1, missing, 2\] getT(x) # shoud return # \[1, T, 2\] # where T …

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## [Very large compilation time (and space)](https://discourse.julialang.org/t/very-large-compilation-time-and-space/28342)

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**Author:** [@aml](https://discourse.julialang.org/u/aml)\
**Replies:** 11\
**Last updated:** [September 6, 2019, 3:47pm UTC](https://discourse.julialang.org/t/very-large-compilation-time-and-space/28342 "2019-09-06T15:47:45Z")

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In a previous post, I mentioned a small interpreter that I wrote both in direct style and in continuation-passing style. In the first case, Julia very quickly compiles the interpreter methods as they are being used. In t…

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## [Assistant Professor of Operations Management (TT and CT Positions available)](https://discourse.julialang.org/t/assistant-professor-of-operations-management-tt-and-ct-positions-available/28472)

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**Author:** [@Adam\_Fleischhacker](https://discourse.julialang.org/u/Adam_Fleischhacker)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 3:22pm UTC](https://discourse.julialang.org/t/assistant-professor-of-operations-management-tt-and-ct-positions-available/28472 "2019-09-06T15:22:37Z")

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Yes, Julia out of a b-school - how cool is that? Specifically, we teach probabilistic programming and data visualization. If you have a Ph.D. (or ABD) and know Turing.jl (or Stan or Tensorflow), we would love to hear f…

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## [Is there a reason why Expressions are not subtyped?](https://discourse.julialang.org/t/is-there-a-reason-why-expressions-are-not-subtyped/28428)

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**Author:** [@jonathanBieler](https://discourse.julialang.org/u/jonathanBieler)\
**Replies:** 7\
**Last updated:** [September 6, 2019, 3:10pm UTC](https://discourse.julialang.org/t/is-there-a-reason-why-expressions-are-not-subtyped/28428 "2019-09-06T15:10:42Z")

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When working with expressions I often find myself writing things like: if ex.head == :call ... if ex.head == :tuple Code in Base is also full of that kind of pattern. It would be much easier to write suc…

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## [Cfunction from 0.6 to 1.0](https://discourse.julialang.org/t/cfunction-from-0-6-to-1-0/28441)

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**Author:** [@tomerarnon](https://discourse.julialang.org/u/tomerarnon)\
**Replies:** 13\
**Last updated:** [September 6, 2019, 2:31pm UTC](https://discourse.julialang.org/t/cfunction-from-0-6-to-1-0/28441 "2019-09-06T14:31:17Z")

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I am upgrading a package that wraps a C library from julia 0.6 to 1.0. In principle this should be very simple, but in practice I am running into some problems (naturally). In particular, migrating from 0.6 to 0.7 as an …

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## [Adjoint sensitivity analysis of ODE - get value of cost functional](https://discourse.julialang.org/t/adjoint-sensitivity-analysis-of-ode-get-value-of-cost-functional/28468)

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**Author:** [@DR59](https://discourse.julialang.org/u/DR59)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 2:22pm UTC](https://discourse.julialang.org/t/adjoint-sensitivity-analysis-of-ode-get-value-of-cost-functional/28468 "2019-09-06T14:22:27Z")

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Dear all, This question is related to the DifferentialEquations.jl package. I’ve used the very helpful documentation here to implement adjoint sensitivity analysis on an ODE. Specifically, i have a cost function of the…

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## [Turning off type inference?](https://discourse.julialang.org/t/turning-off-type-inference/28434)

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**Author:** [@dlfivefifty](https://discourse.julialang.org/u/dlfivefifty)\
**Replies:** 12\
**Last updated:** [September 6, 2019, 1:23pm UTC](https://discourse.julialang.org/t/turning-off-type-inference/28434 "2019-09-06T13:23:44Z")

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Is there a way to turn off type inference? I have a function that’s too keen on making union types that aren’t actually helpful, which causes compilation to take forever (in some cases it seems like I mean literally fore…

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## [Connect to secure server using secure(SSL) sockets(plan tcp client)](https://discourse.julialang.org/t/connect-to-secure-server-using-secure-ssl-sockets-plan-tcp-client/28465)

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**Author:** [@universe68](https://discourse.julialang.org/u/universe68)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 12:44pm UTC](https://discourse.julialang.org/t/connect-to-secure-server-using-secure-ssl-sockets-plan-tcp-client/28465 "2019-09-06T12:44:05Z")

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Hey guys :slight\_smile: I’m trying to connect to remote server(not my server) via socket(no HTTP request) with SSL(no client certificate is needed) The client should have two threads, one thread that waits for incoming…

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## [\[DSP.jl\] What resampling parameters should I use to get the same output as the decimate function in MATLAB?](https://discourse.julialang.org/t/dsp-jl-what-resampling-parameters-should-i-use-to-get-the-same-output-as-the-decimate-function-in-matlab/28357)

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**Author:** [@Losses](https://discourse.julialang.org/u/Losses)\
**Replies:** 4\
**Last updated:** [September 6, 2019, 10:58am UTC](https://discourse.julialang.org/t/dsp-jl-what-resampling-parameters-should-i-use-to-get-the-same-output-as-the-decimate-function-in-matlab/28357 "2019-09-06T10:58:16Z")

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Hello everyone, I am a cognitive neuroscience researcher, have little knowledge about the detail of signal processing, We are trying to resampling our signal with DSP.jl, and expect to get identical(or similar) result as…

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## [KeyError: key \*\*\*\*\* \[86cd37e6-c0ff-550b-95fe-21d72c8d4fc9\] not found while calling "Serialization.deserialize(f)" function](https://discourse.julialang.org/t/keyerror-key-86cd37e6-c0ff-550b-95fe-21d72c8d4fc9-not-found-while-calling-serialization-deserialize-f-function/28442)

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**Author:** [@bsnyh](https://discourse.julialang.org/u/bsnyh)\
**Replies:** 3\
**Last updated:** [September 6, 2019, 10:33am UTC](https://discourse.julialang.org/t/keyerror-key-86cd37e6-c0ff-550b-95fe-21d72c8d4fc9-not-found-while-calling-serialization-deserialize-f-function/28442 "2019-09-06T10:33:46Z")

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Hi. I got a KeyError as the above when using the package \*\*\*\*\*. Could anyone please let me know what might be wrong?

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## [Compute parity of a bit vector](https://discourse.julialang.org/t/compute-parity-of-a-bit-vector/28453)

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**Author:** [@Deniz](https://discourse.julialang.org/u/Deniz)\
**Replies:** 3\
**Last updated:** [September 6, 2019, 10:11am UTC](https://discourse.julialang.org/t/compute-parity-of-a-bit-vector/28453 "2019-09-06T10:11:10Z")

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I’m trying to compute the dot product of two UInt8 bit vectors. First I bitwise-xor them, then I have to compute the parity of the result. Is there a simple way to compute the parity of a single byte stored in a UInt8, …

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## [Something(a, b) not shortcutting](https://discourse.julialang.org/t/something-a-b-not-shortcutting/27746)

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**Author:** [@Charlie\_He](https://discourse.julialang.org/u/Charlie_He)\
**Replies:** 4\
**Last updated:** [September 6, 2019, 9:18am UTC](https://discourse.julialang.org/t/something-a-b-not-shortcutting/27746 "2019-09-06T09:18:56Z")

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Assuming we have: function do\_work(x) sleep(2) x end It turns out something(Some(2), do\_work(3)) still invoke do\_work, which returns 2 seconds later. It would be better to define it as a macro, which retains …

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## [Specialized Base.findfirst for ranges](https://discourse.julialang.org/t/specialized-base-findfirst-for-ranges/28460)

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**Author:** [@pnalysz](https://discourse.julialang.org/u/pnalysz)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 9:10am UTC](https://discourse.julialang.org/t/specialized-base-findfirst-for-ranges/28460 "2019-09-06T09:10:08Z")

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As far as I see at the moment julia uses the same findfirst method for all AbstractArray which simply iterates through all the items. Would it not make sense to have specialized method for ranges that would find the item…

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## [Applications Open for 2020 BSSw Fellowship Program](https://discourse.julialang.org/t/applications-open-for-2020-bssw-fellowship-program/28461)

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**Author:** [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 8:34am UTC](https://discourse.julialang.org/t/applications-open-for-2020-bssw-fellowship-program/28461 "2019-09-06T08:34:34Z")

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BSSw Fellowship Applications Are Now Open Tired of technical debt in scientific software? Got a great idea that would benefit the community? The Better Scientific Software (BSSw) Fellowship program fosters and promote…

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## [Julia REPL Configuration Error: No Julia Executable, please specify one](https://discourse.julialang.org/t/julia-repl-configuration-error-no-julia-executable-please-specify-one/28459)

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**Author:** [@hasanOryx](https://discourse.julialang.org/u/hasanOryx)\
**Replies:** 0\
**Last updated:** [September 6, 2019, 7:04am UTC](https://discourse.julialang.org/t/julia-repl-configuration-error-no-julia-executable-please-specify-one/28459 "2019-09-06T07:04:09Z")

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Trying to work with PyCharm and julia plugin, I added the configuration as below byt still getting error msg Julia REPL Configuration Error: No Julia Executable, please specify one.

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## [What's the fastest to convert a String to an \`Vector{T}\` where \`isbits(T) == true\` and back again?](https://discourse.julialang.org/t/whats-the-fastest-to-convert-a-string-to-an-vector-t-where-isbits-t-true-and-back-again/28458)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 6:24am UTC](https://discourse.julialang.org/t/whats-the-fastest-to-convert-a-string-to-an-vector-t-where-isbits-t-true-and-back-again/28458 "2019-09-06T06:24:07Z")

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I want to see what’s the fastest way to convert a String to an invertible its binary representation (which I assume will be an array of type T for some T). The codeunit should do the trick but it used to be slow. Also h…

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## [non-GUI backend, so cannot show the figure](https://discourse.julialang.org/t/non-gui-backend-so-cannot-show-the-figure/28445)

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**Author:** [@hasanOryx](https://discourse.julialang.org/u/hasanOryx)\
**Replies:** 2\
**Last updated:** [September 6, 2019, 5:54am UTC](https://discourse.julialang.org/t/non-gui-backend-so-cannot-show-the-figure/28445 "2019-09-06T05:54:30Z")

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I’ve the below code that worked with jupyter lab, but once tried it with Julia REPL or PyCharm with Julia plugin I got the below error: ┌ Warning: No working GUI backend found for matplotlib └ @ PyPlot C:\\Users\\hasan.DE…

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## [How do I append (row-bind) a collection of DataFrames together into one?](https://discourse.julialang.org/t/how-do-i-append-row-bind-a-collection-of-dataframes-together-into-one/28456)

<div class="topic-metadata">

**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 1\
**Last updated:** [September 6, 2019, 5:14am UTC](https://discourse.julialang.org/t/how-do-i-append-row-bind-a-collection-of-dataframes-together-into-one/28456 "2019-09-06T05:14:38Z")

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I have a collection of DataFrames all with the same columns, what’s the most efficient way to append them together (row-bind)? a = \[DataFrame(a = 1:3, b = 4:6) for i = 1:3\] How do I efficient append the dataframes in a…

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## [Efficient way to transform Array{Union{Missing,Float64}} to Array{Float64}?](https://discourse.julialang.org/t/efficient-way-to-transform-array-union-missing-float64-to-array-float64/22475)

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**Author:** [@longemen3000](https://discourse.julialang.org/u/longemen3000)\
**Replies:** 11\
**Last updated:** [September 6, 2019, 3:36am UTC](https://discourse.julialang.org/t/efficient-way-to-transform-array-union-missing-float64-to-array-float64/22475 "2019-09-06T03:36:18Z")

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there is a way to transform an array x1 of Union{Missing,Float64} to an Array x2 of Float64 without allocating a new array? .x1 doesn’t containg missing values. an example: x1 = Array{Union{Missing,Float64}}(undef,3) fo…

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## [Error when loading Distributions package for parallel computing](https://discourse.julialang.org/t/error-when-loading-distributions-package-for-parallel-computing/28437)

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**Author:** [@sergevic](https://discourse.julialang.org/u/sergevic)\
**Replies:** 3\
**Last updated:** [September 6, 2019, 3:03am UTC](https://discourse.julialang.org/t/error-when-loading-distributions-package-for-parallel-computing/28437 "2019-09-06T03:03:22Z")

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I’m using parallel computing for some parts of my Julia code and for that, I need to load 2 packages: LinearAlgebra and Distributions. Concerning LinearAlgebra I run the following code and it works: using Distributed us…

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## [How do I read a binary file back into an Array?](https://discourse.julialang.org/t/how-do-i-read-a-binary-file-back-into-an-array/28454)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 1\
**Last updated:** [September 6, 2019, 2:35am UTC](https://discourse.julialang.org/t/how-do-i-read-a-binary-file-back-into-an-array/28454 "2019-09-06T02:35:29Z")

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I have written an Vector{UInt} into a binary file and I want to read the binary file back into a Vector{UInt}. How do I do that? # write it out bbc = rand(UInt8, 100) io = open("io.test", "w") write(io, bbc) close(io) …

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## [Pkg: GtkTextUtils in manifest but not in project](https://discourse.julialang.org/t/pkg-gtktextutils-in-manifest-but-not-in-project/28447)

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**Author:** [@KajWiik](https://discourse.julialang.org/u/KajWiik)\
**Replies:** 0\
**Last updated:** [September 5, 2019, 11:19pm UTC](https://discourse.julialang.org/t/pkg-gtktextutils-in-manifest-but-not-in-project/28447 "2019-09-05T23:19:37Z")

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When I try to install any package, I get the following error message: (v1.1) pkg\> add HTTP Updating registry at \`~/.julia/registries/General\` Updating git-repo \`https://github.com/JuliaRegistries/General.git\` Resol…

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## [Review inefficient pipeline?](https://discourse.julialang.org/t/review-inefficient-pipeline/28215)

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**Author:** [@danriggins](https://discourse.julialang.org/u/danriggins)\
**Replies:** 2\
**Last updated:** [September 5, 2019, 11:06pm UTC](https://discourse.julialang.org/t/review-inefficient-pipeline/28215 "2019-09-05T23:06:12Z")

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Hi, I’m a new learner, trying to learn/practice data ingestion in Julia. I was wondering if anyone could review this pipeline I created to see if there’s a more efficient way to do it. I ultimately want a JuliaDB table, …

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## [@spawnat and remotecall equivalence?](https://discourse.julialang.org/t/spawnat-and-remotecall-equivalence/28404)

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**Author:** [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)\
**Replies:** 2\
**Last updated:** [September 5, 2019, 9:50pm UTC](https://discourse.julialang.org/t/spawnat-and-remotecall-equivalence/28404 "2019-09-05T21:50:27Z")

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Hi, I try to understand the distributed parallel computing Julia’s API and I wonder if I always can use remotecall in place of @spawnat. In the following MWE, I initialize a vector on np procs and I modify these vector…

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## [Arpack build issues](https://discourse.julialang.org/t/arpack-build-issues/27772)

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**Author:** [@Phillip\_Sutton](https://discourse.julialang.org/u/Phillip_Sutton)\
**Replies:** 1\
**Last updated:** [September 5, 2019, 9:00pm UTC](https://discourse.julialang.org/t/arpack-build-issues/27772 "2019-09-05T21:00:00Z")

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When building I get the following error message. I’m running 1.0.3 behind a firewall so updates are readily accessible, but if thats the root cause I can figure something out. Error: Error building 'Arpack': ERROR: Load…

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## [Error building \`PyCall\`](https://discourse.julialang.org/t/error-building-pycall/28438)

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**Author:** [@hasanOryx](https://discourse.julialang.org/u/hasanOryx)\
**Replies:** 1\
**Last updated:** [September 5, 2019, 8:09pm UTC](https://discourse.julialang.org/t/error-building-pycall/28438 "2019-09-05T20:09:24Z")

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I just installed Python3 from the installer at my Windows 10 device, and got this error while trying Pkg.add("PyPlot") In my Mac I also installed python3 from the installer, and got the same error ┌ Error: Error buildi…

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## [\[Flux\]Trouble running examples from the Flux Differentiable control problems blogpost](https://discourse.julialang.org/t/flux-trouble-running-examples-from-the-flux-differentiable-control-problems-blogpost/28417)

<div class="topic-metadata">

**Author:** [@thvhauwe](https://discourse.julialang.org/u/thvhauwe)\
**Replies:** 2\
**Last updated:** [September 5, 2019, 7:21pm UTC](https://discourse.julialang.org/t/flux-trouble-running-examples-from-the-flux-differentiable-control-problems-blogpost/28417 "2019-09-05T19:21:06Z")

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Hey there, Trying to replicate all the results and examples from the blogpost: https://fluxml.ai/2019/03/05/dp-vs-rl.html These are the steps that I used, as described in the README. Zygote trows an error. Running Juli…

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