# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=473

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**Page:** 474

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## [DifferentialEquations and Julia v 1.3?](https://discourse.julialang.org/t/differentialequations-and-julia-v-1-3/31688)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 6\
**Last updated:** [November 30, 2019, 2:29pm UTC](https://discourse.julialang.org/t/differentialequations-and-julia-v-1-3/31688 "2019-11-30T14:29:25Z")

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I just removed Julia v. 1.2 from my Windows 10 64bit laptop, installed Julia v.1.3, and renamed v1.2 in .julia\\environments to v1.3, and did \]instantiate. Then I updated packages, and do using DifferentialEquations. I ge…

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## [Maintaining OpenCL packages](https://discourse.julialang.org/t/maintaining-opencl-packages/16279)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 6\
**Last updated:** [November 29, 2019, 10:20pm UTC](https://discourse.julialang.org/t/maintaining-opencl-packages/16279 "2019-11-29T22:20:22Z")

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I tried asking on slack, but since I didn’t get many replies, I am asking here. Could someone from the JuliaGPU organization please take care of the PRs in OpenCL? There are many attempts to port the package to Julia v1…

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## [Distributed Julia computing failed in Rstudio](https://discourse.julialang.org/t/distributed-julia-computing-failed-in-rstudio/23359)

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**Author:** [@Ziyi\_Chen](https://discourse.julialang.org/u/Ziyi_Chen)\
**Replies:** 10\
**Last updated:** [November 29, 2019, 5:27pm UTC](https://discourse.julialang.org/t/distributed-julia-computing-failed-in-rstudio/23359 "2019-11-29T17:27:54Z")

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I successfully setup JuliaCall in R: install.packages(“JuliaCall”) devtools::install\_github(“Non-Contradiction/JuliaCall”) # get the development version of JuliaCall library(JuliaCall) julia=julia\_setup(JULIA\_HOME …

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## [(Efficient) function to create a Histogram incrementally without plotting it?](https://discourse.julialang.org/t/efficient-function-to-create-a-histogram-incrementally-without-plotting-it/31651)

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**Author:** [@Massimiliano\_Comin](https://discourse.julialang.org/u/Massimiliano_Comin)\
**Replies:** 2\
**Last updated:** [November 29, 2019, 4:26pm UTC](https://discourse.julialang.org/t/efficient-function-to-create-a-histogram-incrementally-without-plotting-it/31651 "2019-11-29T16:26:42Z")

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Hello, I have many random vectors (all of the same nature/size of course) that I want to bin inside a fixed histogram. So basically I would like to incrementally fill a histogram without plotting it, in an efficient fas…

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## [Weird behaviour on contour plot update](https://discourse.julialang.org/t/weird-behaviour-on-contour-plot-update/31572)

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**Author:** [@Andre\_Mello](https://discourse.julialang.org/u/Andre_Mello)\
**Replies:** 10\
**Last updated:** [November 29, 2019, 2:45pm UTC](https://discourse.julialang.org/t/weird-behaviour-on-contour-plot-update/31572 "2019-11-29T14:45:05Z")

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It seems like if the differences in the contour levels are too small, updating the plot breaks its colors. Here’s a MWE to make things clearer. using Plots x = -0.1:0.01:0.1 y = -0.1:0.01:0.1 z = \[i^2+j^2 for i in x, …

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## [Interval arithmetic - computation time](https://discourse.julialang.org/t/interval-arithmetic-computation-time/14633)

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**Author:** [@OlivierHnt](https://discourse.julialang.org/u/OlivierHnt)\
**Replies:** 16\
**Last updated:** [November 29, 2019, 10:02am UTC](https://discourse.julialang.org/t/interval-arithmetic-computation-time/14633 "2019-11-29T10:02:37Z")

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Hi, I just started using the IntervalArithmetic package for Julia. For the same computations, Matlab (using IntLab) performs extremely well in comparison with Julia. The implementation has ben adapted, that is the compu…

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## [Update existing plot instead of showing a new one](https://discourse.julialang.org/t/update-existing-plot-instead-of-showing-a-new-one/31630)

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**Author:** [@maximilianpreisinger](https://discourse.julialang.org/u/maximilianpreisinger)\
**Replies:** 1\
**Last updated:** [November 29, 2019, 9:53am UTC](https://discourse.julialang.org/t/update-existing-plot-instead-of-showing-a-new-one/31630 "2019-11-29T09:53:12Z")

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Hi guys, the whole plotting stuff very confuses me. For example I manage to display my plot with Plots.jl with the plotlyjs backend (it opens a new browser tab and shows my plot), and I am happy with it. However I do no…

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## [Rewriting function on CPU for execution on GPU](https://discourse.julialang.org/t/rewriting-function-on-cpu-for-execution-on-gpu/31608)

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**Author:** [@ennvvy](https://discourse.julialang.org/u/ennvvy)\
**Replies:** 4\
**Last updated:** [November 29, 2019, 5:48am UTC](https://discourse.julialang.org/t/rewriting-function-on-cpu-for-execution-on-gpu/31608 "2019-11-29T05:48:00Z")

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I am trying to execute a function that I am currently running on a CPU on the GPU. There are a few bottlenecks, like accessing elements of an array scalar getindex is disallowed The code is below: using CUDAdrv,CUDAnat…

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## [New Julia user seeking feedback on an in-progress project](https://discourse.julialang.org/t/new-julia-user-seeking-feedback-on-an-in-progress-project/31410)

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**Author:** [@otde](https://discourse.julialang.org/u/otde)\
**Replies:** 5\
**Last updated:** [November 28, 2019, 8:16pm UTC](https://discourse.julialang.org/t/new-julia-user-seeking-feedback-on-an-in-progress-project/31410 "2019-11-28T20:16:03Z")

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https://github.com/OTDE/RenderingGeometry.jl Hi folks! I’m a new Julia user transitioning from Java. Thanks to the folks in the #helpdesk channel on the Slack, I’ve been learning a lot. I’ve started work on a port of th…

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## [Writing simple kernel functions (EM algorithm)](https://discourse.julialang.org/t/writing-simple-kernel-functions-em-algorithm/24787)

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**Author:** [@myroslav](https://discourse.julialang.org/u/myroslav)\
**Replies:** 7\
**Last updated:** [November 28, 2019, 2:39pm UTC](https://discourse.julialang.org/t/writing-simple-kernel-functions-em-algorithm/24787 "2019-11-28T14:39:12Z")

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Hi everyone, I am trying to get my head around writing GPU kernels in Julia, would be great if someone could help me with my example. Without going into too many details, I am trying to run a simple EM (Expectation-Maxi…

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## [Whom to follow on GitHub?](https://discourse.julialang.org/t/whom-to-follow-on-github/31623)

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**Author:** [@ven-k](https://discourse.julialang.org/u/ven-k)\
**Replies:** 1\
**Last updated:** [November 28, 2019, 1:55pm UTC](https://discourse.julialang.org/t/whom-to-follow-on-github/31623 "2019-11-28T13:55:27Z")

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I want to contribute to open source; specifically in machine learning domain with Julia. I want to know who all to follow on GitHub to get to know the community, new trends etc.

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## [Performance of kernel function](https://discourse.julialang.org/t/performance-of-kernel-function/31605)

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**Author:** [@ennvvy](https://discourse.julialang.org/u/ennvvy)\
**Replies:** 3\
**Last updated:** [November 28, 2019, 5:35am UTC](https://discourse.julialang.org/t/performance-of-kernel-function/31605 "2019-11-28T05:35:11Z")

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I tried executing the following function on the GPU, for array sizes of 10,000. function update!(s,c,cedg,θ) index = (blockIdx().x - 1) \* blockDim().x + threadIdx().x stride = blockDim().x \* gridDim().x @inbounds …

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## [Differentiating through a Jump Problem](https://discourse.julialang.org/t/differentiating-through-a-jump-problem/31496)

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**Author:** [@DR59](https://discourse.julialang.org/u/DR59)\
**Replies:** 28\
**Last updated:** [November 28, 2019, 12:41am UTC](https://discourse.julialang.org/t/differentiating-through-a-jump-problem/31496 "2019-11-28T00:41:57Z")

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Hi all, I’m thinking about Gillespie simulations, as one might use to simulate the individual molecules of a chemical reaction. Clearly a Gillespie Simulation (JumpProblem) is non-differentiable, as it has non-determin…

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## [Ignoring missing data when plotting](https://discourse.julialang.org/t/ignoring-missing-data-when-plotting/14124)

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**Author:** [@Kryohi](https://discourse.julialang.org/u/Kryohi)\
**Replies:** 12\
**Last updated:** [November 27, 2019, 10:11pm UTC](https://discourse.julialang.org/t/ignoring-missing-data-when-plotting/14124 "2019-11-27T22:11:38Z")

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Kind of a newbie question, so if this isn’t the appropriate section I’ll move it. I was trying to plot a column of a dataframe with some elements that cannot be calculated. At first I thought of initialize them to 0, a…

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## [AmplNLWriter : supports\_constraint() is ambiguous in MathOptInterface](https://discourse.julialang.org/t/amplnlwriter-supports-constraint-is-ambiguous-in-mathoptinterface/31390)

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**Author:** [@dmit](https://discourse.julialang.org/u/dmit)\
**Replies:** 9\
**Last updated:** [November 27, 2019, 8:41pm UTC](https://discourse.julialang.org/t/amplnlwriter-supports-constraint-is-ambiguous-in-mathoptinterface/31390 "2019-11-27T20:41:43Z")

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Hi there you beautiful people! Complete Julia newbie here, so the problem I’m having may be trivial. I’m trying to use Couenne optimizer with AmplNLWriter interface, but can’t make it work. Here’s my hello-world level…

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## [Mmap problem with SharedArrays](https://discourse.julialang.org/t/mmap-problem-with-sharedarrays/31552)

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**Author:** [@jmcastro2109](https://discourse.julialang.org/u/jmcastro2109)\
**Replies:** 2\
**Last updated:** [November 27, 2019, 1:44pm UTC](https://discourse.julialang.org/t/mmap-problem-with-sharedarrays/31552 "2019-11-27T13:44:49Z")

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Hello, I am confronting a very weird problem when parallelizing some function. I understand that I am supposed to post a MWE but I could not recreate the issue in a simple problem. @everywhere function simulSample(Profi…

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## [First alpha release of JuMP 0.19 (JuMP/MathOptInterface)](https://discourse.julialang.org/t/first-alpha-release-of-jump-0-19-jump-mathoptinterface/16099)

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**Author:** [@miles.lubin](https://discourse.julialang.org/u/miles.lubin)\
**Replies:** 12\
**Last updated:** [November 27, 2019, 1:40pm UTC](https://discourse.julialang.org/t/first-alpha-release-of-jump-0-19-jump-mathoptinterface/16099 "2019-11-27T13:40:58Z")

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To help out early adopters in the big transition to JuMP/MathOptInterface, we’ll be making development tags of JuMP master up to the JuMP 0.19 release. The first development release, v0.19-alpha is now tagged. This is th…

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## [What do I get when I subtype GPUArray?](https://discourse.julialang.org/t/what-do-i-get-when-i-subtype-gpuarray/31537)

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**Author:** [@jpsamaroo](https://discourse.julialang.org/u/jpsamaroo)\
**Replies:** 7\
**Last updated:** [November 27, 2019, 11:04am UTC](https://discourse.julialang.org/t/what-do-i-get-when-i-subtype-gpuarray/31537 "2019-11-27T11:04:44Z")

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As the main developer of ROCArrays.jl, I’m trying to understand what benefits I get when I make ROCArray \<: GPUArray. GPUArrays.jl is a rather large package (likely due to it also implementing JLArray), so it’s hard for …

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## [How to plot a subplots in PlotlyJS](https://discourse.julialang.org/t/how-to-plot-a-subplots-in-plotlyjs/31424)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 4\
**Last updated:** [November 27, 2019, 3:31am UTC](https://discourse.julialang.org/t/how-to-plot-a-subplots-in-plotlyjs/31424 "2019-11-27T03:31:05Z")

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How can I use PlotlyJS.jl to make two subplots with two traces each with shared x-axis? What I have: using PlotlyJS trace1 = PlotlyJS.scatter(x=1:3, y=rand(3)) trace2 = PlotlyJS.scatter(x=1:3, y=rand(3)) trace3 = Plot…

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## [Difficulty in solving a MINLP](https://discourse.julialang.org/t/difficulty-in-solving-a-minlp/31555)

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**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 2\
**Last updated:** [November 27, 2019, 12:56am UTC](https://discourse.julialang.org/t/difficulty-in-solving-a-minlp/31555 "2019-11-27T00:56:43Z")

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Hello all, i’m trying to solve a MINLP using Couenne. These are my variables and constraints: Constraints: 1040 Variables: 1048 (8 integer) Auxiliaries: 3530 (13 integer) It had a lot more, bu…

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## [How to extract the Standard Deviation out of Turing.jl](https://discourse.julialang.org/t/how-to-extract-the-standard-deviation-out-of-turing-jl/31519)

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**Author:** [@StevenSiew](https://discourse.julialang.org/u/StevenSiew)\
**Replies:** 3\
**Last updated:** [November 27, 2019, 12:35am UTC](https://discourse.julialang.org/t/how-to-extract-the-standard-deviation-out-of-turing-jl/31519 "2019-11-27T00:35:18Z")

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I am trying to extract the Standard Deviation out of Turing for the parameter p but it kept giving me an error. I was tired and frustrated and I could not think straight. I guess I need to take a break. The guide here …

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## [Time tick issue on x-axis](https://discourse.julialang.org/t/time-tick-issue-on-x-axis/15643)

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**Author:** [@jling](https://discourse.julialang.org/u/jling)\
**Replies:** 7\
**Last updated:** [November 26, 2019, 10:26pm UTC](https://discourse.julialang.org/t/time-tick-issue-on-x-axis/15643 "2019-11-26T22:26:25Z")

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I’m trying to plot a time-related histogram where the x-axis is times in a day, but I want the ticks to increase every 30 minutes instead of the crazy amount of ticks defaulted by Gadfly. Any other plotting package solu…

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## [Need help getting started with FluxML](https://discourse.julialang.org/t/need-help-getting-started-with-fluxml/31196)

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**Author:** [@cgo](https://discourse.julialang.org/u/cgo)\
**Replies:** 5\
**Last updated:** [November 25, 2019, 9:47pm UTC](https://discourse.julialang.org/t/need-help-getting-started-with-fluxml/31196 "2019-11-25T21:47:53Z")

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Hi all, I am just getting started with Flux. While the documentation is present, I have a hard time finding some information. In particular, these are some questions that came up: am I to use Zygote or the Tracker m…

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## [Multiple plots in Plots.jl](https://discourse.julialang.org/t/multiple-plots-in-plots-jl/31497)

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**Author:** [@atteson](https://discourse.julialang.org/u/atteson)\
**Replies:** 2\
**Last updated:** [November 25, 2019, 4:20pm UTC](https://discourse.julialang.org/t/multiple-plots-in-plots-jl/31497 "2019-11-25T16:20:09Z")

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Why doesn’t the following work: using Plots pyplot() p=plot(layout=2) for i = 1:2 plot!(p,rand(10),subplot=i) end while the following does work: using Plots pyplot() p=plot(layout=2) plot!(p,rand(10),subplot=1) pl…

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## [Statistic for differentiating two distributions?](https://discourse.julialang.org/t/statistic-for-differentiating-two-distributions/31492)

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**Author:** [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)\
**Replies:** 6\
**Last updated:** [November 25, 2019, 3:35pm UTC](https://discourse.julialang.org/t/statistic-for-differentiating-two-distributions/31492 "2019-11-25T15:35:32Z")

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I need some advice on choosing a proper statistical test for project I will be starting soon. My expectation is that the data will consist of two distinct datasets with similar (normal?) distributions, but different mean…

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## [How to NLsolve with sparsity but no jacobian?](https://discourse.julialang.org/t/how-to-nlsolve-with-sparsity-but-no-jacobian/31462)

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**Author:** [@MatFi](https://discourse.julialang.org/u/MatFi)\
**Replies:** 7\
**Last updated:** [November 25, 2019, 8:41am UTC](https://discourse.julialang.org/t/how-to-nlsolve-with-sparsity-but-no-jacobian/31462 "2019-11-25T08:41:38Z")

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From the NLsolve-docs i know that one can pass a jacobian to nlsolve and make the solver treating the jacobian as sparse. But what can I do when I don’t want to write down a jacobian of a PDE discretisation, and only k…

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## [Bayesian Analysis of Weighted Parameter](https://discourse.julialang.org/t/bayesian-analysis-of-weighted-parameter/31372)

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**Author:** [@Alec\_Loudenback](https://discourse.julialang.org/u/Alec_Loudenback)\
**Replies:** 10\
**Last updated:** [November 25, 2019, 6:41am UTC](https://discourse.julialang.org/t/bayesian-analysis-of-weighted-parameter/31372 "2019-11-25T06:41:34Z")

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I am interested in analyzing the posterior distribution of a Bernoulli parameter, weighted by given amounts. A simple example: weights = \[100, 50 , 50, 150, 200 \] trials = \[1, 0, 0, 1, 0 \] q\_weghted = sum(weights .\* …

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## [Question Regarding leveraging MLJ.jl's CV features for my own](https://discourse.julialang.org/t/question-regarding-leveraging-mlj-jls-cv-features-for-my-own/31439)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 5\
**Last updated:** [November 25, 2019, 12:42am UTC](https://discourse.julialang.org/t/question-regarding-leveraging-mlj-jls-cv-features-for-my-own/31439 "2019-11-25T00:42:49Z")

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I tried to read through the Adding Models for General Use · MLJ article, but I can’t find any information on how I can expose the hyper-parameters in my model to MLJ.jl so that I can use MLJ’s infrastructure to do CV. Ca…

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## [JuMP : Solving an optimisation problem with a large matrix of variables](https://discourse.julialang.org/t/jump-solving-an-optimisation-problem-with-a-large-matrix-of-variables/31347)

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**Author:** [@Wedg](https://discourse.julialang.org/u/Wedg)\
**Replies:** 4\
**Last updated:** [November 24, 2019, 2:08pm UTC](https://discourse.julialang.org/t/jump-solving-an-optimisation-problem-with-a-large-matrix-of-variables/31347 "2019-11-24T14:08:09Z")

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Hi all I have an optimisation of the following form. # Size rows = 6000 cols = 10 # Create model with solver model = Model(with\_optimizer(GLPK.Optimizer)) # Create binary variables @variable(model, X\[1:rows, 1:cols\],…

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## [Flow Charts? LightGraphs?](https://discourse.julialang.org/t/flow-charts-lightgraphs/31139)

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**Author:** [@anon92994695](https://discourse.julialang.org/u/anon92994695)\
**Replies:** 11\
**Last updated:** [November 24, 2019, 1:34am UTC](https://discourse.julialang.org/t/flow-charts-lightgraphs/31139 "2019-11-24T01:34:35Z")

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How hard would it be to make a quick and dirty wrapper for flow chart plots from DAGs? I gave it a whirl for a jupyter notebook blog I am writing. Didn’t come out so hot! using GraphRecipes using Plots using LightGraph…

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