# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=508

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**Page:** 509

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## [How use SCIP in Windows](https://discourse.julialang.org/t/how-use-scip-in-windows/20929)

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**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 3\
**Last updated:** [February 18, 2019, 2:38pm UTC](https://discourse.julialang.org/t/how-use-scip-in-windows/20929 "2019-02-18T14:38:36Z")

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Hello, Can anyone help in how to install SCIP to use it in Windows through Julia 0.6/JuMP? I’ve seen some instructions here: But only for OS X and Linux, so i have no idea what i need to do to use it in Windows. I’…

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## [Median vs 50th Quantile giving different answers](https://discourse.julialang.org/t/median-vs-50th-quantile-giving-different-answers/18414)

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**Author:** [@davidzentlermunro](https://discourse.julialang.org/u/davidzentlermunro)\
**Replies:** 6\
**Last updated:** [February 18, 2019, 1:22pm UTC](https://discourse.julialang.org/t/median-vs-50th-quantile-giving-different-answers/18414 "2019-02-18T13:22:09Z")

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I’m getting different answers for median(v,w::AnalyticWeights) and quantile(v,w::AnalyticWeights,0.5) and not sure why. Any ideas?

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## [How to embed 2D slices of an array in a 3D plot using plot recipes?](https://discourse.julialang.org/t/how-to-embed-2d-slices-of-an-array-in-a-3d-plot-using-plot-recipes/20857)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 6\
**Last updated:** [February 18, 2019, 11:49am UTC](https://discourse.julialang.org/t/how-to-embed-2d-slices-of-an-array-in-a-3d-plot-using-plot-recipes/20857 "2019-02-18T11:49:02Z")

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Given a 3D array, I would like to produce the following visualization: The main problem I have is that I don’t know how to embed 2D slices in a 3D plot using plot recipes. Appreciate if you can help, or if you can pr…

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## [SatelliteToolbox.jl now supports IAU-2006/2010 model](https://discourse.julialang.org/t/satellitetoolbox-jl-now-supports-iau-2006-2010-model/20915)

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**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 1\
**Last updated:** [February 18, 2019, 6:05am UTC](https://discourse.julialang.org/t/satellitetoolbox-jl-now-supports-iau-2006-2010-model/20915 "2019-02-18T06:05:58Z")

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Hi guys! Just want to announce that with the latest set of commits, SatelliteToolbox.jl now supports the entire IAU-2006/2010 theory (CIO approach). The code is 100% written in Julia without requiring external libraries.…

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## [Vline! alters y-axis labels using Plots with GR](https://discourse.julialang.org/t/vline-alters-y-axis-labels-using-plots-with-gr/20918)

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**Author:** [@colintbowers](https://discourse.julialang.org/u/colintbowers)\
**Replies:** 0\
**Last updated:** [February 18, 2019, 12:43am UTC](https://discourse.julialang.org/t/vline-alters-y-axis-labels-using-plots-with-gr/20918 "2019-02-18T00:43:27Z")

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Hi all, An MWE follows: using Plots dt = \[ today() + Day(10\*n) for n = 1:100 \]; x = randn(100); p = plot(dt, x); savefig(p, "/home/colin/TempPlot/a1.svg"); dtlab = dt\[1:20:100\]; vline!(p, dtlab); savefig(p, "/home/coli…

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## [Best way to store data for GPU use](https://discourse.julialang.org/t/best-way-to-store-data-for-gpu-use/20792)

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**Author:** [@MrRobot](https://discourse.julialang.org/u/MrRobot)\
**Replies:** 7\
**Last updated:** [February 16, 2019, 5:27pm UTC](https://discourse.julialang.org/t/best-way-to-store-data-for-gpu-use/20792 "2019-02-16T17:27:14Z")

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Hello, I am writing code in Julia for molecular simulation. Currently it is only for CPU’s, but I would like to convert it to GPU’s once I have it running and tested. I am forever in a quandary about how to store data (…

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## [writing in excel](https://discourse.julialang.org/t/writing-in-excel/9577)

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**Author:** [@razieh95](https://discourse.julialang.org/u/razieh95)\
**Replies:** 3\
**Last updated:** [February 16, 2019, 4:56pm UTC](https://discourse.julialang.org/t/writing-in-excel/9577 "2019-02-16T16:56:53Z")

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hi. How write value variables in different excel sheets?

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## [Sensitivity analysis in optimization](https://discourse.julialang.org/t/sensitivity-analysis-in-optimization/20833)

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**Author:** [@rev](https://discourse.julialang.org/u/rev)\
**Replies:** 2\
**Last updated:** [February 15, 2019, 9:00pm UTC](https://discourse.julialang.org/t/sensitivity-analysis-in-optimization/20833 "2019-02-15T21:00:33Z")

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Hello All, New to Optimization & JuMP. Trying to do sensitivity analysis for this example, and wondering how to get reduced costs, objective coefficients, allowable increase/decrease, shadow prices, and final values for…

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## [Counterfactual Regret Minimization](https://discourse.julialang.org/t/counterfactual-regret-minimization/19543)

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**Author:** [@ajkeith](https://discourse.julialang.org/u/ajkeith)\
**Replies:** 1\
**Last updated:** [February 15, 2019, 8:52pm UTC](https://discourse.julialang.org/t/counterfactual-regret-minimization/19543 "2019-02-15T20:52:11Z")

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Is anyone aware of a Julia implementation of Counterfactual Regret Minimization (CFR)? I found a python implementation but I haven’t been able to find anything in Julia. I’m thinking about writing a Julia implementation…

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## [Function values under the cursor](https://discourse.julialang.org/t/function-values-under-the-cursor/3469)

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**Author:** [@Tulio\_Valentim](https://discourse.julialang.org/u/Tulio_Valentim)\
**Replies:** 4\
**Last updated:** [February 14, 2019, 3:00pm UTC](https://discourse.julialang.org/t/function-values-under-the-cursor/3469 "2019-02-14T15:00:42Z")

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Hi, someone could help me to plot a graph that show the function value under the cursor? For example in the image below if the black point is cursor it will show (-0.5,2) Tks

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## [Parameter Estimate Problem](https://discourse.julialang.org/t/parameter-estimate-problem/20695)

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**Author:** [@hzgzh](https://discourse.julialang.org/u/hzgzh)\
**Replies:** 6\
**Last updated:** [February 14, 2019, 7:37am UTC](https://discourse.julialang.org/t/parameter-estimate-problem/20695 "2019-02-14T07:37:53Z")

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I find the IDA() can’t converge,the program keeping runing ,can’t not stop,how to select DAE algorithm to solve the prob. using Plots,DifferentialEquations,SmoothingSplines,Optim,Sundials using DiffEqParamEstim t=\[ 0, …

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## [User-defined outputs in DifferentialEquations](https://discourse.julialang.org/t/user-defined-outputs-in-differentialequations/20754)

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**Author:** [@asprionj](https://discourse.julialang.org/u/asprionj)\
**Replies:** 3\
**Last updated:** [February 13, 2019, 4:34pm UTC](https://discourse.julialang.org/t/user-defined-outputs-in-differentialequations/20754 "2019-02-13T16:34:54Z")

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Hi, is there a possibility to specify outputs that are recorded along the state variables when running a simulation in DifferentialEquations? I could not find anything relating to this in the documentation… Of course, I…

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## [Functions in @distributed for do not work](https://discourse.julialang.org/t/functions-in-distributed-for-do-not-work/20737)

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**Author:** [@MMalakhov](https://discourse.julialang.org/u/MMalakhov)\
**Replies:** 3\
**Last updated:** [February 13, 2019, 10:04am UTC](https://discourse.julialang.org/t/functions-in-distributed-for-do-not-work/20737 "2019-02-13T10:04:21Z")

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Hello! I use Julia 1.0.2 on Atom. I’m trying to parallel my loop and there is a problem which I don’t understand. Parallel loops work great without functions inside. Also program work great on 1 worker with functions. …

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## [Query.jl: How can I write type-preserving methods for iterable tables](https://discourse.julialang.org/t/query-jl-how-can-i-write-type-preserving-methods-for-iterable-tables/19956)

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**Author:** [@ablaom](https://discourse.julialang.org/u/ablaom)\
**Replies:** 2\
**Last updated:** [February 13, 2019, 5:46am UTC](https://discourse.julialang.org/t/query-jl-how-can-i-write-type-preserving-methods-for-iterable-tables/19956 "2019-02-13T05:46:16Z")

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In MLJ.jl, we are trying to write a data-agnostic machine-learning framework and are presently trying to make this work using Query, to which I am new. We would like to write methods that take an iterable table as input…

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## [JuliaDB cross reference](https://discourse.julialang.org/t/juliadb-cross-reference/20705)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 3\
**Last updated:** [February 12, 2019, 8:00pm UTC](https://discourse.julialang.org/t/juliadb-cross-reference/20705 "2019-02-12T20:00:52Z")

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Disclaimer: I do not know any SQL. JuliaDB seems really straightforward so I’m trying it instead of some SQLish solution (although I suspect that’s what I should be using). I have a few tables (currently saved as .csv f…

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## [Sub set selection and column generation](https://discourse.julialang.org/t/sub-set-selection-and-column-generation/20716)

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**Author:** [@ndinsmore](https://discourse.julialang.org/u/ndinsmore)\
**Replies:** 0\
**Last updated:** [February 12, 2019, 5:55pm UTC](https://discourse.julialang.org/t/sub-set-selection-and-column-generation/20716 "2019-02-12T17:55:23Z")

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Before I ask my question let me give you an overview of the basic problem I am trying to solve: Given: 1.) a set of 2000+ nodes + node A & B 2.) With 20+ different connected graphs made up of a sub set of the given s…

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## [Problem defining a Straight Through Estimator gradient](https://discourse.julialang.org/t/problem-defining-a-straight-through-estimator-gradient/20698)

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**Author:** [@velix](https://discourse.julialang.org/u/velix)\
**Replies:** 0\
**Last updated:** [February 12, 2019, 11:31am UTC](https://discourse.julialang.org/t/problem-defining-a-straight-through-estimator-gradient/20698 "2019-02-12T11:31:00Z")

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Hi all, I am trying to define a custom STE gradient in Flux. The activation function is the sign function, and its gradient should just be the incoming gradient as is, iff its absolute value is \<= 1, or cancelled other…

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## [Using RemoteChannels in a Publisher/Subscriber Model](https://discourse.julialang.org/t/using-remotechannels-in-a-publisher-subscriber-model/20523)

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**Author:** [@colinxs](https://discourse.julialang.org/u/colinxs)\
**Replies:** 2\
**Last updated:** [February 12, 2019, 10:52am UTC](https://discourse.julialang.org/t/using-remotechannels-in-a-publisher-subscriber-model/20523 "2019-02-12T10:52:31Z")

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Hello all! I’m interested in leveraging Julia’s built-in RemoteChannels to replicate some of the functionality that ROS (http://www.ros.org/) provides. Unfortunately I’m running into some issues with calling put! on a R…

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## [Understanding GRU forward pass as implemented in Knet](https://discourse.julialang.org/t/understanding-gru-forward-pass-as-implemented-in-knet/20639)

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**Author:** [@Christian\_Dengler](https://discourse.julialang.org/u/Christian_Dengler)\
**Replies:** 1\
**Last updated:** [February 12, 2019, 5:00am UTC](https://discourse.julialang.org/t/understanding-gru-forward-pass-as-implemented-in-knet/20639 "2019-02-12T05:00:06Z")

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Hello all, I tried to reimplement the simple forward pass of a GRU layer in order to be able to evaluate the RNN in other languages after training in Julia. So far with no luck, and Im starting to be out of ideas. Is th…

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## [Please can you explain the use of get! and IdDict in optimisers.jl](https://discourse.julialang.org/t/please-can-you-explain-the-use-of-get-and-iddict-in-optimisers-jl/20685)

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**Author:** [@murphyk](https://discourse.julialang.org/u/murphyk)\
**Replies:** 5\
**Last updated:** [February 12, 2019, 12:51am UTC](https://discourse.julialang.org/t/please-can-you-explain-the-use-of-get-and-iddict-in-optimisers-jl/20685 "2019-02-12T00:51:24Z")

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I’m trying to understand the optimization code for momentum which reads function apply!(o::Momentum, x, Δ) η, ρ = o.eta, o.rho v = get!(o.velocity, x, zero(x))::typeof(x) @. v = ρ \* v - η \* Δ @. Δ = -v end I do…

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## [Uncertainties in DiffEqFlux.jl](https://discourse.julialang.org/t/uncertainties-in-diffeqflux-jl/20660)

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**Author:** [@spinkney](https://discourse.julialang.org/u/spinkney)\
**Replies:** 2\
**Last updated:** [February 11, 2019, 9:40pm UTC](https://discourse.julialang.org/t/uncertainties-in-diffeqflux-jl/20660 "2019-02-11T21:40:51Z")

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I watched the JuliaCon 2018 | PuMaS.jl: Pharmaceutical Modeling and Simulation Engine given by @ChrisRackauckas and saw the part about propagation of parameter uncertainties around 21:47. A (possibly) quick question reg…

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## [Electro and magneto statics](https://discourse.julialang.org/t/electro-and-magneto-statics/20634)

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**Author:** [@Lee\_Streeter](https://discourse.julialang.org/u/Lee_Streeter)\
**Replies:** 6\
**Last updated:** [February 11, 2019, 8:35pm UTC](https://discourse.julialang.org/t/electro-and-magneto-statics/20634 "2019-02-11T20:35:21Z")

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I’ve been hunting for a package for electro and magneto static modelling. The best I can find are a few FEM packages that have not had recent updates for over a year (according to github). Right now I’m looking into Dif…

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## [Automatic Differentiation](https://discourse.julialang.org/t/automatic-differentiation/17472)

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**Author:** [@kkmann](https://discourse.julialang.org/u/kkmann)\
**Replies:** 11\
**Last updated:** [February 11, 2019, 2:19pm UTC](https://discourse.julialang.org/t/automatic-differentiation/17472 "2019-02-11T14:19:18Z")

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Hey, I am still having a bit of a hard time figuring out what flux.jl actually does. One important aspect seems to be making gradients available automatically via tracking. How does that differ from the approach in Forw…

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## [Applying \`quantile\` to \`AbstractArray\`s](https://discourse.julialang.org/t/applying-quantile-to-abstractarray-s/20619)

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**Author:** [@heliosdrm](https://discourse.julialang.org/u/heliosdrm)\
**Replies:** 1\
**Last updated:** [February 10, 2019, 12:11am UTC](https://discourse.julialang.org/t/applying-quantile-to-abstractarray-s/20619 "2019-02-10T00:11:35Z")

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The docstring of quantile in the Statistics module says: quantile(itr, p; sorted=false) Compute the quantile(s) of a collection itr at a specified probability or vector or tuple of probabilities p on the interval \[0,…

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## [New blog post on banded matrices and ordinary differential equations using BandedMatrices.jl](https://discourse.julialang.org/t/new-blog-post-on-banded-matrices-and-ordinary-differential-equations-using-bandedmatrices-jl/18564)

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**Author:** [@dlfivefifty](https://discourse.julialang.org/u/dlfivefifty)\
**Replies:** 31\
**Last updated:** [February 9, 2019, 7:12am UTC](https://discourse.julialang.org/t/new-blog-post-on-banded-matrices-and-ordinary-differential-equations-using-bandedmatrices-jl/18564 "2019-02-09T07:12:55Z")

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I just posted my first blog post, on using BandedMatrices.jl to solve ordinary differential equations via finite differences / spectral methods: Banded matrices and ordinary differential equations This is first of a ser…

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## [GPU Map without reduction on multiple arrays indices](https://discourse.julialang.org/t/gpu-map-without-reduction-on-multiple-arrays-indices/20565)

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**Author:** [@mleprovost](https://discourse.julialang.org/u/mleprovost)\
**Replies:** 1\
**Last updated:** [February 8, 2019, 7:20am UTC](https://discourse.julialang.org/t/gpu-map-without-reduction-on-multiple-arrays-indices/20565 "2019-02-08T07:20:11Z")

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Hello, I would like to compute a multi-dimensional array (4-D) A of a 2 components function f on a large multi-dimensional domain (X,Y,T) with GPU. So A will have size: 2, NX, NY, NT. X, Y and T are 1D arrays I tried …

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## [Run external commands in parallel](https://discourse.julialang.org/t/run-external-commands-in-parallel/20268)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 10\
**Last updated:** [February 7, 2019, 6:59pm UTC](https://discourse.julialang.org/t/run-external-commands-in-parallel/20268 "2019-02-07T18:59:22Z")

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I have a computation for which the time-consuming part boils down to calling an external program, in particular with read(cmd, String) in parallel for 1-5 values of cmd. Should I just construct the commands, and use pma…

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## [StackOverflowError with julia v1.1 similar to previous bug v0.7](https://discourse.julialang.org/t/stackoverflowerror-with-julia-v1-1-similar-to-previous-bug-v0-7/20531)

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**Author:** [@tlagos](https://discourse.julialang.org/u/tlagos)\
**Replies:** 5\
**Last updated:** [February 7, 2019, 5:26pm UTC](https://discourse.julialang.org/t/stackoverflowerror-with-julia-v1-1-similar-to-previous-bug-v0-7/20531 "2019-02-07T17:26:42Z")

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Hi everyone, I’ve been dealing with a similar error that this one. The output is the following: ERROR: LoadError: StackOverflowError: Stacktrace: \[1\] (::Interpolations.GriddedInterpolation{Float64,1,Float64,Gridded{Li…

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## [DifferentialEquations.jl: complex-value matrix equations without in-place update](https://discourse.julialang.org/t/differentialequations-jl-complex-value-matrix-equations-without-in-place-update/20110)

<div class="topic-metadata">

**Author:** [@Egwene\_al\_Vere](https://discourse.julialang.org/u/Egwene_al_Vere)\
**Replies:** 1\
**Last updated:** [February 7, 2019, 2:49pm UTC](https://discourse.julialang.org/t/differentialequations-jl-complex-value-matrix-equations-without-in-place-update/20110 "2019-02-07T14:49:30Z")

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To solve a stiff complex-value matrix equation, I’m using the Rosenbrock23() solver. As a minimum working example, (may not be stiff, just to illustrate the error I got) With in-place du, (function taking 4 arguments: d…

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## [How to design distributed (CPU/GPU) reinforcement learning methods?](https://discourse.julialang.org/t/how-to-design-distributed-cpu-gpu-reinforcement-learning-methods/20539)

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**Author:** [@jbrea](https://discourse.julialang.org/u/jbrea)\
**Replies:** 0\
**Last updated:** [February 7, 2019, 10:17am UTC](https://discourse.julialang.org/t/how-to-design-distributed-cpu-gpu-reinforcement-learning-methods/20539 "2019-02-07T10:17:55Z")

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Question to the experts on distributed computing: How should we design distributed reinforcement learning methods in julia? Ray has a nice approach with different optimizers for methods that move around gradients or ba…

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