# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=527

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

**Page:** 528

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## [Get basic variables of Gurobi solution](https://discourse.julialang.org/t/get-basic-variables-of-gurobi-solution/14605)

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**Author:** [@stelmo](https://discourse.julialang.org/u/stelmo)\
**Replies:** 3\
**Last updated:** [September 8, 2018, 3:15am UTC](https://discourse.julialang.org/t/get-basic-variables-of-gurobi-solution/14605 "2018-09-08T03:15:25Z")

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Hi, Does anyone know how to get the basic variables after Gurobi solves an LP? It is not enough to just check for nonzero numbers in the solution since there could be degenerate basic variables. Gurobi exposes the funct…

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## [The integrator module](https://discourse.julialang.org/t/the-integrator-module/14365)

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**Author:** [@sysk\_msk](https://discourse.julialang.org/u/sysk_msk)\
**Replies:** 4\
**Last updated:** [September 7, 2018, 9:22pm UTC](https://discourse.julialang.org/t/the-integrator-module/14365 "2018-09-07T21:22:22Z")

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I want to calculate the following formula: but I can’t find the integrator module as Int() in MATLAB. how could I solve the problem using Julia?

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## [Symplectic integration and dynamic Hamiltonian Monte Carlo](https://discourse.julialang.org/t/symplectic-integration-and-dynamic-hamiltonian-monte-carlo/14602)

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**Author:** [@cscherrer](https://discourse.julialang.org/u/cscherrer)\
**Replies:** 6\
**Last updated:** [September 6, 2018, 4:08pm UTC](https://discourse.julialang.org/t/symplectic-integration-and-dynamic-hamiltonian-monte-carlo/14602 "2018-09-06T16:08:22Z")

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In A Conceptual Introduction to Hamiltonian Monte Carlo, Michael Betancourt talks about the instability of computing Hamiltonian trajectories, and introduces symplectic integration, especially “leapfrog” as a solution. D…

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## [ANN: PlotlyJS.jl Julia 1.0 compatible](https://discourse.julialang.org/t/ann-plotlyjs-jl-julia-1-0-compatible/14620)

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**Author:** [@sglyon](https://discourse.julialang.org/u/sglyon)\
**Replies:** 0\
**Last updated:** [September 6, 2018, 2:17pm UTC](https://discourse.julialang.org/t/ann-plotlyjs-jl-julia-1-0-compatible/14620 "2018-09-06T14:17:39Z")

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Just an annoncement that PlotlyJS has been updated for Julia 1.0. There are a few exciting new features: Use WebIO.jl for all display integrations. This simplified the code in PlotlyJS.jl (net reduction of about 700 L…

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## [Publication & DOI on JuliaStats package](https://discourse.julialang.org/t/publication-doi-on-juliastats-package/14479)

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**Author:** [@mbesancon](https://discourse.julialang.org/u/mbesancon)\
**Replies:** 9\
**Last updated:** [September 5, 2018, 9:22pm UTC](https://discourse.julialang.org/t/publication-doi-on-juliastats-package/14479 "2018-09-05T21:22:47Z")

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Unlike other Julia ecosystems, there is no publication associated to packages of the JuliaStats ecosystem. It would be nice to have the software citable For packages which would not be considered worth a paper, a DOI th…

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## [Wrapping function chains in a type](https://discourse.julialang.org/t/wrapping-function-chains-in-a-type/14586)

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**Author:** [@RainerHeintzmann](https://discourse.julialang.org/u/RainerHeintzmann)\
**Replies:** 0\
**Last updated:** [September 5, 2018, 3:59pm UTC](https://discourse.julialang.org/t/wrapping-function-chains-in-a-type/14586 "2018-09-05T15:59:41Z")

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I am having difficulties to understand how to best avoid local memory allocation. Here is some code based on CartesianIndices, which works really fast and nicely as it is NOT allocating extra memory: using LinearAlgebra…

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## [CFP: NIPS Workshop FEAP-AI4Fin 2018 (due 10/25)](https://discourse.julialang.org/t/cfp-nips-workshop-feap-ai4fin-2018-due-10-25/14556)

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**Author:** [@jiahao](https://discourse.julialang.org/u/jiahao)\
**Replies:** 0\
**Last updated:** [September 4, 2018, 10:35pm UTC](https://discourse.julialang.org/t/cfp-nips-workshop-feap-ai4fin-2018-due-10-25/14556 "2018-09-04T22:35:34Z")

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I’m happy to announce that the call for participation is now open for the NIPS 2018 Workshop on Challenges and Opportunities for AI in Financial Services: the Impact of Fairness, Explainability, Accuracy, and Privacy. …

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## [Logistic regression with GLM : not working with Categorical Arrays?](https://discourse.julialang.org/t/logistic-regression-with-glm-not-working-with-categorical-arrays/14411)

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**Author:** [@kirtsar](https://discourse.julialang.org/u/kirtsar)\
**Replies:** 1\
**Last updated:** [September 2, 2018, 3:08am UTC](https://discourse.julialang.org/t/logistic-regression-with-glm-not-working-with-categorical-arrays/14411 "2018-09-02T03:08:49Z")

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Hello there! I’m trying to do logistic regression using GLM Package. My Y-variable is of type categorical array, the predictor is the usual Float64-array. When I’m trying to make a model with @formula(Y ~ X), I’ve got a…

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## [using Makie ERROR](https://discourse.julialang.org/t/using-makie-error/14431)

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**Author:** [@dbarends](https://discourse.julialang.org/u/dbarends)\
**Replies:** 7\
**Last updated:** [September 4, 2018, 9:10am UTC](https://discourse.julialang.org/t/using-makie-error/14431 "2018-09-04T09:10:22Z")

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Just added Makie, using julia v1.0, i get an error when using Makie julia\> using Makie \[ Info: Precompiling Makie \[ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a\] ERROR: LoadError: ArgumentError: Package Makie does not have Color…

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## [CuArray and Optim](https://discourse.julialang.org/t/cuarray-and-optim/14053)

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**Author:** [@RainerHeintzmann](https://discourse.julialang.org/u/RainerHeintzmann)\
**Replies:** 9\
**Last updated:** [September 4, 2018, 6:38am UTC](https://discourse.julialang.org/t/cuarray-and-optim/14053 "2018-09-04T06:38:41Z")

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I am trying to write some deconvolution code in Julia via combining LBFGS Optimization (Optim.jl), automatic differentiation (AutoGrad.jl) and Cuda support (CuArray). Julia 1.0 on Windows 10. I finally have some runnab…

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## [Is there any example of porting an octave multi compartment PBPK ode model to Julia?](https://discourse.julialang.org/t/is-there-any-example-of-porting-an-octave-multi-compartment-pbpk-ode-model-to-julia/14506)

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**Author:** [@mmarikar](https://discourse.julialang.org/u/mmarikar)\
**Replies:** 1\
**Last updated:** [September 4, 2018, 1:07am UTC](https://discourse.julialang.org/t/is-there-any-example-of-porting-an-octave-multi-compartment-pbpk-ode-model-to-julia/14506 "2018-09-04T01:07:42Z")

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I was able to get a single compartment model working as indicated below using Chris R’s links. My example can be seen at https://github.com/mmarikar/julia/blob/master/OneCompartmentPBPKmodel.jl Does anyone have an exam…

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## [CSV.read with really small decimal value](https://discourse.julialang.org/t/csv-read-with-really-small-decimal-value/14274)

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**Author:** [@youngjae.woo](https://discourse.julialang.org/u/youngjae.woo)\
**Replies:** 3\
**Last updated:** [September 3, 2018, 10:49pm UTC](https://discourse.julialang.org/t/csv-read-with-really-small-decimal-value/14274 "2018-09-03T22:49:21Z")

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CSV.read runs into the following error if there is a value below 5e-324. ERROR: MethodError: no method matching /(::Base.TwicePrecision{Float64}, ::Base.TwicePrecision{Float64}) Closest candidates are: /(::Base.TwiceP…

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## [How Define a Complex JuMP Variable](https://discourse.julialang.org/t/how-define-a-complex-jump-variable/14362)

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**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 3\
**Last updated:** [September 3, 2018, 8:16pm UTC](https://discourse.julialang.org/t/how-define-a-complex-jump-variable/14362 "2018-09-03T20:16:06Z")

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How can this be done? I remember there was a Complex128 syntax or something, but i couldn’t find how to use it in a JuMP variable. Here’s my problem, assume i already have the values of Rf, Xlf and Xcf: Nt = 2; hmax = …

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## [Gadfly: transparent histogram layers](https://discourse.julialang.org/t/gadfly-transparent-histogram-layers/6705)

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**Author:** [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Replies:** 13\
**Last updated:** [September 3, 2018, 11:08am UTC](https://discourse.julialang.org/t/gadfly-transparent-histogram-layers/6705 "2018-09-03T11:08:14Z")

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All I want to do is plot two histograms on the same plot in layers and make them both transparent so I can see both at the same time. I can’t for the life of me figure out how to do this, I’ve tried many of the differen…

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## [Makie.jl Mouse Interaction Question/Discussion](https://discourse.julialang.org/t/makie-jl-mouse-interaction-question-discussion/14396)

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**Author:** [@standarddeviant](https://discourse.julialang.org/u/standarddeviant)\
**Replies:** 11\
**Last updated:** [September 3, 2018, 9:30am UTC](https://discourse.julialang.org/t/makie-jl-mouse-interaction-question-discussion/14396 "2018-09-03T09:30:23Z")

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I recently got Julia 1.0.0 up and running with my favorite packages and tried out Makie and interactive plotting just worked! I have a question and potential suggestion about the mouse interaction model and curious to s…

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## [Huber objective](https://discourse.julialang.org/t/huber-objective/14338)

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**Author:** [@Zranz](https://discourse.julialang.org/u/Zranz)\
**Replies:** 2\
**Last updated:** [August 31, 2018, 11:40pm UTC](https://discourse.julialang.org/t/huber-objective/14338 "2018-08-31T23:40:46Z")

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Hi. I wanted to know if it is possible to place a Huber loss in the objective of a quadratic problem in JuMP 0.18. The Huber function can be defined as follows: huber(a,delta)= abs(a) \<= delta ? 1/2\*a^2 : delta\*(abs(a)…

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## [Error when using @distributed for on cluster with multiple nodes](https://discourse.julialang.org/t/error-when-using-distributed-for-on-cluster-with-multiple-nodes/14377)

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**Author:** [@thehalfspace](https://discourse.julialang.org/u/thehalfspace)\
**Replies:** 4\
**Last updated:** [August 31, 2018, 9:02pm UTC](https://discourse.julialang.org/t/error-when-using-distributed-for-on-cluster-with-multiple-nodes/14377 "2018-08-31T21:02:24Z")

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I have a code with some simple @sync @distributed for loops. It works fine when I run it on my computer with 4 processors, or on the cluster with 1 node and any number of processors per node. But when I run it with more…

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## [Should we use N0f8 to store image?](https://discourse.julialang.org/t/should-we-use-n0f8-to-store-image/14315)

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**Author:** [@JohnnyChen94](https://discourse.julialang.org/u/JohnnyChen94)\
**Replies:** 0\
**Last updated:** [August 30, 2018, 1:00pm UTC](https://discourse.julialang.org/t/should-we-use-n0f8-to-store-image/14315 "2018-08-30T13:00:51Z")

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We use N0f8 to store image data in default. But I wonder if this does correctly. using Images # my custom function function down\_intensity!(img::Array{Gray{T}}, bit) where T gray\_level = range(0, stop = 1, length=…

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## [Videos in Blink + WebIO?](https://discourse.julialang.org/t/videos-in-blink-webio/13372)

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**Author:** [@hhaensel](https://discourse.julialang.org/u/hhaensel)\
**Replies:** 3\
**Last updated:** [August 30, 2018, 9:26pm UTC](https://discourse.julialang.org/t/videos-in-blink-webio/13372 "2018-08-30T21:26:27Z")

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I successfully learned how to display plots and text in Blink + WebIO :slight\_smile: Now I would like to include image and video files on the page, however, I don’t know how to share the files via WebIO. I would like t…

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## [Issue with HDF5/Homebrew on 0.6.4](https://discourse.julialang.org/t/issue-with-hdf5-homebrew-on-0-6-4/13791)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 0\
**Last updated:** [August 20, 2018, 9:56pm UTC](https://discourse.julialang.org/t/issue-with-hdf5-homebrew-on-0-6-4/13791 "2018-08-20T21:56:46Z")

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The following is preventing me from getting HDF5 up and running. This used to work for me, but I had to reinstall 0.6.4 after finding I couldn’t get HDF5 in 0.7 working, and now HDF5 won’t install. INFO: Building HDF5 …

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## [GPUArrays, 64-32bit conversions, and Cassete.jl](https://discourse.julialang.org/t/gpuarrays-64-32bit-conversions-and-cassete-jl/14294)

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**Author:** [@Raf](https://discourse.julialang.org/u/Raf)\
**Replies:** 8\
**Last updated:** [August 30, 2018, 3:06pm UTC](https://discourse.julialang.org/t/gpuarrays-64-32bit-conversions-and-cassete-jl/14294 "2018-08-30T15:06:30Z")

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I’m writing some frameworks that run arbitrary user code on the GPU, but I’m missing the performance gains of using only 32bit numbers. Is anyone else thinking about automatic 32/64 bit code transformations using Casset…

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## [Custom Modules with Distributed](https://discourse.julialang.org/t/custom-modules-with-distributed/14321)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 1\
**Last updated:** [August 30, 2018, 2:48pm UTC](https://discourse.julialang.org/t/custom-modules-with-distributed/14321 "2018-08-30T14:48:14Z")

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In 0.6.x of Julia, the following worked for me: modulepath = "/home/me/code/my\_modules"; addprocs(4); push!(LOAD\_PATH,modulepath); @everywhere using MyModule # rest of my code In the above, MyModule is some custom modu…

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## [HDF5 error on 0.6.4](https://discourse.julialang.org/t/hdf5-error-on-0-6-4/14319)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 0\
**Last updated:** [August 30, 2018, 2:10pm UTC](https://discourse.julialang.org/t/hdf5-error-on-0-6-4/14319 "2018-08-30T14:10:50Z")

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I’ve been trying to convert some data form .jld to .jld2 and when reading in one of my files, I encountered the following error: julia\> load("/Users/gideonsimpson/filename1.jld") HDF5-DIAG: Error detected in HDF5 (1.10.…

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## [Http request via unix socket](https://discourse.julialang.org/t/http-request-via-unix-socket/14306)

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**Author:** [@Kaiyin\_Zhong](https://discourse.julialang.org/u/Kaiyin_Zhong)\
**Replies:** 0\
**Last updated:** [August 30, 2018, 11:16am UTC](https://discourse.julialang.org/t/http-request-via-unix-socket/14306 "2018-08-30T11:16:55Z")

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I am wondering how I can achieve the following in Julia: curl --unix-socket /var/run/docker.sock http://v1.37/containers/json

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## [Ingesting data to JuliaDB without .csv files](https://discourse.julialang.org/t/ingesting-data-to-juliadb-without-csv-files/11347)

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**Author:** [@ElOceanografo](https://discourse.julialang.org/u/ElOceanografo)\
**Replies:** 4\
**Last updated:** [August 30, 2018, 5:52am UTC](https://discourse.julialang.org/t/ingesting-data-to-juliadb-without-csv-files/11347 "2018-08-30T05:52:20Z")

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I’ve got a large dataset of several million short audio clips (i.e., waveforms in 1D arrays, plus metadata). Total size is about 500 GB, stored across 140,000 .jld files. I need to go through and calculate a set of sum…

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## [is the code correct to set parameters in Gurobi](https://discourse.julialang.org/t/is-the-code-correct-to-set-parameters-in-gurobi/14226)

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**Author:** [@Summer](https://discourse.julialang.org/u/Summer)\
**Replies:** 2\
**Last updated:** [August 30, 2018, 4:49am UTC](https://discourse.julialang.org/t/is-the-code-correct-to-set-parameters-in-gurobi/14226 "2018-08-30T04:49:43Z")

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Hello, I am using Gurobi as the solver in Julia to solve the problem but now encountered the out-of-memory error. I understand that Gurobi has parameters such as NodefileStart and Thread to deal with this problem (h…

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## [Performant, interactive Plots.jl backend for jupyter notebook](https://discourse.julialang.org/t/performant-interactive-plots-jl-backend-for-jupyter-notebook/11266)

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**Author:** [@standarddeviant](https://discourse.julialang.org/u/standarddeviant)\
**Replies:** 7\
**Last updated:** [August 30, 2018, 3:29am UTC](https://discourse.julialang.org/t/performant-interactive-plots-jl-backend-for-jupyter-notebook/11266 "2018-08-30T03:29:59Z")

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I’ve been using Plots.jl with plotlyjs() for interactive plots and automated ‘report’ generation. I appreciate the work that’s gone in to Plots.jl and PlotlyJS.jl - I use them every day! Some of the individual plots ha…

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## [Julia program reading CSV file from stdin](https://discourse.julialang.org/t/julia-program-reading-csv-file-from-stdin/14208)

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**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 13\
**Last updated:** [August 29, 2018, 7:56pm UTC](https://discourse.julialang.org/t/julia-program-reading-csv-file-from-stdin/14208 "2018-08-29T19:56:56Z")

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I am wondering whether it is possible to embed a CSV file in a julia program. It almost works with CSV.read(), except I do not see a way to signal “EOF” (like with ^D on the REPL). julia\> using DataFrames, CSV julia\> …

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## [ANN: Feather.jl v0.4.0 (lazy edition)](https://discourse.julialang.org/t/ann-feather-jl-v0-4-0-lazy-edition/14219)

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**Author:** [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Replies:** 2\
**Last updated:** [August 29, 2018, 1:23pm UTC](https://discourse.julialang.org/t/ann-feather-jl-v0-4-0-lazy-edition/14219 "2018-08-29T13:23:14Z")

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Hello all, it’s finally time to announce something that we’ve been working on and using extensively for a good while now, that is the new Feather.jl. (We still have to fix our docs, see latest for the v0.4.0 docs.) For…

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## [SubDataFrame to DataFrame](https://discourse.julialang.org/t/subdataframe-to-dataframe/2241)

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**Author:** [@Diego\_Javier\_Zea](https://discourse.julialang.org/u/Diego_Javier_Zea)\
**Replies:** 4\
**Last updated:** [August 29, 2018, 9:47am UTC](https://discourse.julialang.org/t/subdataframe-to-dataframe/2241 "2018-08-29T09:47:21Z")

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Hi! I was trying to use a function that not accept SubDataFrames inside by() (in particular https://github.com/JuliaInterop/RCall.jl/issues/167). I found that there is not way to get a DataFrame from a SubDataFrame. It …

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