# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=406

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**Page:** 407

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## [Parallel simulations on multiple cores on Azure](https://discourse.julialang.org/t/parallel-simulations-on-multiple-cores-on-azure/50680)

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**Author:** [@maxpiot](https://discourse.julialang.org/u/maxpiot)\
**Replies:** 0\
**Last updated:** [November 24, 2020, 11:46am UTC](https://discourse.julialang.org/t/parallel-simulations-on-multiple-cores-on-azure/50680 "2020-11-24T11:46:11Z")

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I have some fairly computationally intensive simulation code that I would like to run across multiple cores, (independently, only combining data at the end of a simulation). Currently I run this on my PC, using the pmap …

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## [A question about scatter plot in Plots.jl](https://discourse.julialang.org/t/a-question-about-scatter-plot-in-plots-jl/50638)

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**Author:** [@O\_Julia](https://discourse.julialang.org/u/O_Julia)\
**Replies:** 2\
**Last updated:** [November 24, 2020, 11:02am UTC](https://discourse.julialang.org/t/a-question-about-scatter-plot-in-plots-jl/50638 "2020-11-24T11:02:37Z")

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I have three variables as coordinates in space and a fourth variable being color. I want to assign each color to each point in space. In python this can be done as follows: from mpl\_toolkits.mplot3d import Axes3D import…

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## [Arbitrary precision computations: BigFloat and ArbNumerics.jl](https://discourse.julialang.org/t/arbitrary-precision-computations-bigfloat-and-arbnumerics-jl/50645)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 8\
**Last updated:** [November 24, 2020, 9:41am UTC](https://discourse.julialang.org/t/arbitrary-precision-computations-bigfloat-and-arbnumerics-jl/50645 "2020-11-24T09:41:35Z")

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Hey, I have troubles to understand why arbitrary precision in Julia has to go through C code, like biglofats (that uses the mpfr library), and ArbNumerics (that uses the Arb library). Although these are stunning packag…

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## [Ipopt Fails in ver. 1.5.3!](https://discourse.julialang.org/t/ipopt-fails-in-ver-1-5-3/50600)

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**Author:** [@Amirrezz94](https://discourse.julialang.org/u/Amirrezz94)\
**Replies:** 13\
**Last updated:** [November 23, 2020, 10:57pm UTC](https://discourse.julialang.org/t/ipopt-fails-in-ver-1-5-3/50600 "2020-11-23T22:57:56Z")

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Hi, I just updated the julia to version 1.5.3 on windows 10 and I faced the this error when I tried to solve an optimization problem with JuMP and Ipopt: “EXIT: Restoration Failed!”. Even I tried a very basic problem l…

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## [Binary integer variable returned as float64](https://discourse.julialang.org/t/binary-integer-variable-returned-as-float64/50647)

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**Author:** [@bvilmann](https://discourse.julialang.org/u/bvilmann)\
**Replies:** 4\
**Last updated:** [November 23, 2020, 10:53pm UTC](https://discourse.julialang.org/t/binary-integer-variable-returned-as-float64/50647 "2020-11-23T22:53:39Z")

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I have a mixed-integer optimization problem with two variables: A binary integer, x, and a float, P\_G I was a little surprised that the value matrix of the binary integer variable was of type float64 and not int64: jul…

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## [\`Using\` with Distributed](https://discourse.julialang.org/t/using-with-distributed/50633)

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**Author:** [@BioTurboNick](https://discourse.julialang.org/u/BioTurboNick)\
**Replies:** 1\
**Last updated:** [November 23, 2020, 5:38pm UTC](https://discourse.julialang.org/t/using-with-distributed/50633 "2020-11-23T17:38:44Z")

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I noticed recently that when I try to do using for a package with worker processes, it appears to try loading it on all workers simultaneously, which creates some issues. When I removed the worker processes and ran the s…

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## [Creating GRASS.jl good or bad idea?](https://discourse.julialang.org/t/creating-grass-jl-good-or-bad-idea/50495)

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**Author:** [@WhiteFenrir](https://discourse.julialang.org/u/WhiteFenrir)\
**Replies:** 5\
**Last updated:** [November 23, 2020, 4:05pm UTC](https://discourse.julialang.org/t/creating-grass-jl-good-or-bad-idea/50495 "2020-11-23T16:05:12Z")

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Dear all, I start working with Julia and I feel a lack of integrated GIS package. I can find many packages that sometimes need to be used together to have a full workflow. That is great but the GeoJulia ecosystem still …

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## [Correct sensealg for an ensemble problem of stochastic UODEs with diagonal noise](https://discourse.julialang.org/t/correct-sensealg-for-an-ensemble-problem-of-stochastic-uodes-with-diagonal-noise/50490)

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**Author:** [@Libbum](https://discourse.julialang.org/u/Libbum)\
**Replies:** 17\
**Last updated:** [November 23, 2020, 10:03am UTC](https://discourse.julialang.org/t/correct-sensealg-for-an-ensemble-problem-of-stochastic-uodes-with-diagonal-noise/50490 "2020-11-23T10:03:04Z")

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Hi all, I can’t seem to get my stochastic UODE running. Here’s the setup and generation of synthetic data: using Plots, DiffEqFlux, Flux, Optim, LinearAlgebra, DifferentialEquations using Statistics using DiffEqSensiti…

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## [Strange CUDA\_ERROR\_OUT\_OF\_MEMORY when using CUDA on HPC](https://discourse.julialang.org/t/strange-cuda-error-out-of-memory-when-using-cuda-on-hpc/50428)

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**Author:** [@UtkarshChemE](https://discourse.julialang.org/u/UtkarshChemE)\
**Replies:** 5\
**Last updated:** [November 23, 2020, 6:45am UTC](https://discourse.julialang.org/t/strange-cuda-error-out-of-memory-when-using-cuda-on-hpc/50428 "2020-11-23T06:45:13Z")

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I am using CUDA.jl v2.3 on a HPC GPU cluster. There is a 50% chance that my job will receive an error of out of memory. Otherwise, the same script will run to completion. Any clue why this is happening. The error stack …

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## [Support for CategoricalValue in StatsPlots](https://discourse.julialang.org/t/support-for-categoricalvalue-in-statsplots/47523)

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**Author:** [@skorpio11](https://discourse.julialang.org/u/skorpio11)\
**Replies:** 3\
**Last updated:** [November 23, 2020, 4:25am UTC](https://discourse.julialang.org/t/support-for-categoricalvalue-in-statsplots/47523 "2020-11-23T04:25:00Z")

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Hi I am following the walkthrough for StatsPlots at: https://github.com/JuliaPlots/StatsPlots.jl Using Julia Version 1.4.1 Got into problems when trying the violin plot: singers = RDatasets.dataset("lattice", "singer…

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## [Improving performance (Stochastic Path + Ipopt/Jump Optim on 32 cores/132RAM)](https://discourse.julialang.org/t/improving-performance-stochastic-path-ipopt-jump-optim-on-32-cores-132ram/50510)

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**Author:** [@Bruno](https://discourse.julialang.org/u/Bruno)\
**Replies:** 6\
**Last updated:** [November 23, 2020, 3:37am UTC](https://discourse.julialang.org/t/improving-performance-stochastic-path-ipopt-jump-optim-on-32-cores-132ram/50510 "2020-11-23T03:37:51Z")

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Hello! I’ve created a gist with some Julia code. Basically I generate a path of a stochastic process (size 1000 array) and use it to analytically estimate one of the parameters (via nonlinear optim on a max likelihood su…

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## [Unusual JuMP and NLopt problem](https://discourse.julialang.org/t/unusual-jump-and-nlopt-problem/50595)

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**Author:** [@optimist](https://discourse.julialang.org/u/optimist)\
**Replies:** 4\
**Last updated:** [November 22, 2020, 11:59pm UTC](https://discourse.julialang.org/t/unusual-jump-and-nlopt-problem/50595 "2020-11-22T23:59:13Z")

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This is a rather unusual problem for JuMP as I am using it to find roots of a function. I have tried Optim and Roots packages but I find them frequently failing-most likely due to the way I use them! IntervalRootFinding …

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## [Create variable name in dataframe that is groupby key](https://discourse.julialang.org/t/create-variable-name-in-dataframe-that-is-groupby-key/50590)

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**Author:** [@croberts](https://discourse.julialang.org/u/croberts)\
**Replies:** 1\
**Last updated:** [November 22, 2020, 8:07pm UTC](https://discourse.julialang.org/t/create-variable-name-in-dataframe-that-is-groupby-key/50590 "2020-11-22T20:07:31Z")

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Suppose we have the dataframe: df = DataFrame(Dict( :name =\> (“AAA”, “AAA”, “AAA”, “AAB”, “AAB”, “CCC”, “DDE”, “DDE”)) Each unique string in :name represents a group. We can use the split-apply-combine strategy descri…

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## [How do I install backends for Plots.jl](https://discourse.julialang.org/t/how-do-i-install-backends-for-plots-jl/50592)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 4\
**Last updated:** [November 22, 2020, 7:50pm UTC](https://discourse.julialang.org/t/how-do-i-install-backends-for-plots-jl/50592 "2020-11-22T19:50:17Z")

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How do I install a backend for Plots.jl? I wanted to try PGFPlotsX, to see if it would allow easier editing in LaTeX

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## [Sliders and plot together in one windows](https://discourse.julialang.org/t/sliders-and-plot-together-in-one-windows/50538)

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**Author:** [@Tomas\_Pevny](https://discourse.julialang.org/u/Tomas_Pevny)\
**Replies:** 2\
**Last updated:** [November 22, 2020, 1:16pm UTC](https://discourse.julialang.org/t/sliders-and-plot-together-in-one-windows/50538 "2020-11-22T13:16:01Z")

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Hi, I am preparing a lecture on Hypothesis testing for students and plan to go from the very basic, hopefully helping them understand the problems. Last year, my notebook was in Jupyter with Interact package, which was…

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## [Julia DifferentialEquations: add two delays into ODE](https://discourse.julialang.org/t/julia-differentialequations-add-two-delays-into-ode/50362)

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**Author:** [@Luigi\_Marongiu](https://discourse.julialang.org/u/Luigi_Marongiu)\
**Replies:** 14\
**Last updated:** [November 22, 2020, 8:13am UTC](https://discourse.julialang.org/t/julia-differentialequations-add-two-delays-into-ode/50362 "2020-11-22T08:13:14Z")

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Hello, I have a set of ODEs to model the invasion of a bacterium in presence of phages. I have inserted the invading bacterium at t=1000 using a delay. function multiInfect!(du, u, p, t) μ, ν, κ, φ, ψ, ω, β, Β, ρ, …

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## [Speed up model in Turing](https://discourse.julialang.org/t/speed-up-model-in-turing/50555)

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**Author:** [@ohmsweetohm1](https://discourse.julialang.org/u/ohmsweetohm1)\
**Replies:** 1\
**Last updated:** [November 21, 2020, 10:46pm UTC](https://discourse.julialang.org/t/speed-up-model-in-turing/50555 "2020-11-21T22:46:30Z")

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Note that I am new to Turing as well as to Bayesian inference. I have to following simple Bayesian linear regression model. (This is pretty much the tutorial example) Turing.@model function linear\_regression(x, y) …

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## [A mutable struct that does not get mutated ? or does it?](https://discourse.julialang.org/t/a-mutable-struct-that-does-not-get-mutated-or-does-it/50537)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 3\
**Last updated:** [November 21, 2020, 5:38pm UTC](https://discourse.julialang.org/t/a-mutable-struct-that-does-not-get-mutated-or-does-it/50537 "2020-11-21T17:38:21Z")

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Hi, I’m trying to code an extension do Distributions.jl for a certain distribution (Some gamma convolutions), and implementing the Moschopoulos algorithm. I have an issue: To compute the pdf, i need to cache certain va…

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## [CUDA.sqrt will not found symbol "\_\_nv\_sqrt"](https://discourse.julialang.org/t/cuda-sqrt-will-not-found-symbol-nv-sqrt/50533)

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**Author:** [@HaoxuanGuo](https://discourse.julialang.org/u/HaoxuanGuo)\
**Replies:** 1\
**Last updated:** [November 21, 2020, 4:15pm UTC](https://discourse.julialang.org/t/cuda-sqrt-will-not-found-symbol-nv-sqrt/50533 "2020-11-21T16:15:55Z")

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I think this may be a bug and reported it. https://github.com/JuliaGPU/CUDA.jl/issues/559#issue-748013387 Now I wonder if this a artifact error because other math function like abs are not work too. But, what caused it…

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## [Export as Word](https://discourse.julialang.org/t/export-as-word/50518)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 8\
**Last updated:** [November 21, 2020, 12:29pm UTC](https://discourse.julialang.org/t/export-as-word/50518 "2020-11-21T12:29:11Z")

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How do I export a Julia Markdown as a .doc or .docx document

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## [Turing: Observing sum of two random dice](https://discourse.julialang.org/t/turing-observing-sum-of-two-random-dice/50486)

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**Author:** [@Hakan\_Kjellerstrand](https://discourse.julialang.org/u/Hakan_Kjellerstrand)\
**Replies:** 4\
**Last updated:** [November 21, 2020, 8:29am UTC](https://discourse.julialang.org/t/turing-observing-sum-of-two-random-dice/50486 "2020-11-21T08:29:03Z")

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I’m (still) a Turing beginner and tries to build some simple models (porting my WebPPL models). I now wonder how observing a sum of two (DiscreteUniform) random variables works, i.e. to force the sum to a specific value. …

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## [Benchmarks of Various Formats for Tabular Data](https://discourse.julialang.org/t/benchmarks-of-various-formats-for-tabular-data/50489)

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**Author:** [@lungben](https://discourse.julialang.org/u/lungben)\
**Replies:** 1\
**Last updated:** [November 21, 2020, 4:14am UTC](https://discourse.julialang.org/t/benchmarks-of-various-formats-for-tabular-data/50489 "2020-11-21T04:14:38Z")

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Hi, here is a Pluto.jl notebook for benchmarking of the read and write performance, as well as file sizes of various formats for tabular data. The following formats / packages are compared: CSV via GitHub - JuliaDa…

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## [Get infeasibility certificate in CPLEX or Gurobi](https://discourse.julialang.org/t/get-infeasibility-certificate-in-cplex-or-gurobi/50506)

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**Author:** [@pkienscherf](https://discourse.julialang.org/u/pkienscherf)\
**Replies:** 3\
**Last updated:** [November 20, 2020, 7:18pm UTC](https://discourse.julialang.org/t/get-infeasibility-certificate-in-cplex-or-gurobi/50506 "2020-11-20T19:18:09Z")

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Hi, I’m trying to retrieve an extreme/dual infeasibility ray from a JuMP Model. I tried to do so with the GLPK, CPLEX, and Gurobi Solvers. I currently have the following versions installed: \[a076750e\] CPLEX v0.7.3 …

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## [Distributions.jl extension](https://discourse.julialang.org/t/distributions-jl-extension/50501)

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**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 2\
**Last updated:** [November 20, 2020, 3:34pm UTC](https://discourse.julialang.org/t/distributions-jl-extension/50501 "2020-11-20T15:34:16Z")

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Hi, I’m trying to code an extension of the Distributions.jl to add my own distribution, a convolution of N gammas, for which there exists an efficient algorithm for exact pdf / cdf computations. I wrote a bunch of code…

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## [Query root relaxation values with JuMP](https://discourse.julialang.org/t/query-root-relaxation-values-with-jump/50465)

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**Author:** [@afazevedo](https://discourse.julialang.org/u/afazevedo)\
**Replies:** 2\
**Last updated:** [November 20, 2020, 2:23pm UTC](https://discourse.julialang.org/t/query-root-relaxation-values-with-jump/50465 "2020-11-20T14:23:42Z")

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Whats the easiest way to query root relaxation value with JuMP? I’m reoptimizing and setting “NodeLimit” parameter to 1.

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## [How to generate a random number in CUDA kernel function](https://discourse.julialang.org/t/how-to-generate-a-random-number-in-cuda-kernel-function/50364)

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**Author:** [@HaoxuanGuo](https://discourse.julialang.org/u/HaoxuanGuo)\
**Replies:** 4\
**Last updated:** [November 20, 2020, 1:11am UTC](https://discourse.julialang.org/t/how-to-generate-a-random-number-in-cuda-kernel-function/50364 "2020-11-20T01:11:56Z")

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All the rand like function in CUDA.jl will get a CuArray. But memory allocation is not allowed in a kernel function. Thus, a CuArray can not be generated. So, are there any method to get a pure random number instead of a…

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## [NVIDIA Tensor Cores not useful for double-precision simulations?](https://discourse.julialang.org/t/nvidia-tensor-cores-not-useful-for-double-precision-simulations/50245)

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**Author:** [@Zhong\_Pan](https://discourse.julialang.org/u/Zhong_Pan)\
**Replies:** 12\
**Last updated:** [November 19, 2020, 10:47pm UTC](https://discourse.julialang.org/t/nvidia-tensor-cores-not-useful-for-double-precision-simulations/50245 "2020-11-19T22:47:28Z")

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I am using CUDA.jl to speed up double-precision simulations with large matrix computations and FFT (e.g. Split Step Fourier Method). I heard about Tensor Cores on NVIDIA GPUs and have the following questions: Tensor …

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## [Overnight a ERROR: StackOverflowError: in unchanged code](https://discourse.julialang.org/t/overnight-a-error-stackoverflowerror-in-unchanged-code/50449)

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**Author:** [@GerhardTotschnig](https://discourse.julialang.org/u/GerhardTotschnig)\
**Replies:** 3\
**Last updated:** [November 19, 2020, 9:22pm UTC](https://discourse.julialang.org/t/overnight-a-error-stackoverflowerror-in-unchanged-code/50449 "2020-11-19T21:22:43Z")

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Up to yesterday I had no problem with the code: https://github.com/GerhardTotschnig/Seasonal I think the code is unchanged. And the code still works on other computers. Starting from the REPL julia\>include("SeasUL.jl…

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## [Redundant and non-redundant constraints](https://discourse.julialang.org/t/redundant-and-non-redundant-constraints/50314)

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**Author:** [@kat\_mt](https://discourse.julialang.org/u/kat_mt)\
**Replies:** 5\
**Last updated:** [November 19, 2020, 9:20pm UTC](https://discourse.julialang.org/t/redundant-and-non-redundant-constraints/50314 "2020-11-19T21:20:14Z")

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Hello! I need to solve a LP model with CPLEX and find which of constraints are non redundant. After solving, it gives me the following message: Tried aggregator 1 time. LP Presolve eliminated 22 rows and 0 columns. R…

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## [Generate singular value sequentialy](https://discourse.julialang.org/t/generate-singular-value-sequentialy/50434)

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**Author:** [@Geoffrey](https://discourse.julialang.org/u/Geoffrey)\
**Replies:** 2\
**Last updated:** [November 19, 2020, 2:13pm UTC](https://discourse.julialang.org/t/generate-singular-value-sequentialy/50434 "2020-11-19T14:13:25Z")

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Hi, I’m wondering if there is a way of generating singular value sequentialy. I’m aware of the truncated svd utilities from TSVD.jl and LowRankApprox.jl but to my knowledge they didn’t provide a way to generate singular…

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