# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=366

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**Page:** 367

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## [Rodas5 and ModelingToolkit much slower than Sundials' IDA on large systems](https://discourse.julialang.org/t/rodas5-and-modelingtoolkit-much-slower-than-sundials-ida-on-large-systems/60712)

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**Author:** [@bmetherall](https://discourse.julialang.org/u/bmetherall)\
**Replies:** 7\
**Last updated:** [May 13, 2021, 1:21am UTC](https://discourse.julialang.org/t/rodas5-and-modelingtoolkit-much-slower-than-sundials-ida-on-large-systems/60712 "2021-05-13T01:21:38Z")

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I’m trying to solve a 1-D advection-diffusion-reaction equation which has been discretized into a set of ODEs. My code below is about 30x slower for n~1000 than a similar implementation as a DAEProblem solved with IDA().…

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## [LoadError: UndefVarError: Grisu not defined](https://discourse.julialang.org/t/loaderror-undefvarerror-grisu-not-defined/61000)

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**Author:** [@healyp](https://discourse.julialang.org/u/healyp)\
**Replies:** 7\
**Last updated:** [May 12, 2021, 10:15pm UTC](https://discourse.julialang.org/t/loaderror-undefvarerror-grisu-not-defined/61000 "2021-05-12T22:15:23Z")

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I’m getting the above error with JuMP / MathOptInterface when I attempt to write a model to a file: MOI.write\_to\_file(lp\_model, gName\*".lp") I note that there has been some discussion about Grisu in a plots+1.6 context…

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## [Fitting normalizing flows with Bijectors.jl](https://discourse.julialang.org/t/fitting-normalizing-flows-with-bijectors-jl/60383)

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**Author:** [@mateuszbaran](https://discourse.julialang.org/u/mateuszbaran)\
**Replies:** 6\
**Last updated:** [May 12, 2021, 9:42pm UTC](https://discourse.julialang.org/t/fitting-normalizing-flows-with-bijectors-jl/60383 "2021-05-12T21:42:05Z")

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Hi! I’d like to fit a normalizing flow to some data using Bijectors.jl. I’m a bit lost because I couldn’t find any complete examples. This is what I managed to do so far: using Bijectors using KernelDensity using Stats…

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## [How to update JuMP](https://discourse.julialang.org/t/how-to-update-jump/60682)

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**Author:** [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Replies:** 2\
**Last updated:** [May 12, 2021, 6:05pm UTC](https://discourse.julialang.org/t/how-to-update-jump/60682 "2021-05-12T18:05:57Z")

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I’m with JuMP v0.18.6 and I want to update to v0.21, but whenever I try the following message appears: julia\> Pkg.update ("JuMP") Updating registry at \`C: \\ Users \\ raquel.santos \\ .julia \\ registries \\ General\` …

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## [Cannon's or SUMA algorithm implementation?](https://discourse.julialang.org/t/cannons-or-suma-algorithm-implementation/61034)

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**Author:** [@Chase\_Roberts](https://discourse.julialang.org/u/Chase_Roberts)\
**Replies:** 0\
**Last updated:** [May 12, 2021, 5:22pm UTC](https://discourse.julialang.org/t/cannons-or-suma-algorithm-implementation/61034 "2021-05-12T17:22:57Z")

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Are there any examples of doing distributed matmuls with Cannon’s or SUMA algorithm in Julia?

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## [Difference between Inference methods in BayesNet.jl](https://discourse.julialang.org/t/difference-between-inference-methods-in-bayesnet-jl/61023)

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**Author:** [@ashwanimalviya](https://discourse.julialang.org/u/ashwanimalviya)\
**Replies:** 0\
**Last updated:** [May 12, 2021, 1:36pm UTC](https://discourse.julialang.org/t/difference-between-inference-methods-in-bayesnet-jl/61023 "2021-05-12T13:36:05Z")

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Hi Guys, Can someone please suggest to me where can I get more details to understand the difference between the attached InferenceMethods. Thanks in advance.

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## [Source of financial data including earnings dates, implied volatility, historical vol and much more](https://discourse.julialang.org/t/source-of-financial-data-including-earnings-dates-implied-volatility-historical-vol-and-much-more/60925)

<div class="topic-metadata">

**Author:** [@anon69491625](https://discourse.julialang.org/u/anon69491625)\
**Replies:** 4\
**Last updated:** [May 12, 2021, 1:26pm UTC](https://discourse.julialang.org/t/source-of-financial-data-including-earnings-dates-implied-volatility-historical-vol-and-much-more/60925 "2021-05-12T13:26:55Z")

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Hi all, so I’ve noticed that quite a few of you are wanting a reliable source of earnings data and dates. Also implied volatility and historical vol. This is not an ad as we have no fiscal relationship with them, It’s j…

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## [Controlling thread affinity for distributed multithreading](https://discourse.julialang.org/t/controlling-thread-affinity-for-distributed-multithreading/53869)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 3\
**Last updated:** [May 12, 2021, 12:44pm UTC](https://discourse.julialang.org/t/controlling-thread-affinity-for-distributed-multithreading/53869 "2021-05-12T12:44:49Z")

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I have a question regarding the setup of hybrid parallelism which combines multithreading and distributed computations. Let’s say I want to run some computation on a machine with Non-Uniform Memory Access. In this case,…

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## [Optim: Problems with Fminbox and the NelderMead algorithm](https://discourse.julialang.org/t/optim-problems-with-fminbox-and-the-neldermead-algorithm/60978)

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**Author:** [@itzui](https://discourse.julialang.org/u/itzui)\
**Replies:** 4\
**Last updated:** [May 12, 2021, 10:44am UTC](https://discourse.julialang.org/t/optim-problems-with-fminbox-and-the-neldermead-algorithm/60978 "2021-05-12T10:44:39Z")

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Hi, Today my Optim package was updated. However, after this update, the optimization doesn’t work anymore. For the optimization I use the Nelder-Mead algorithm. In order to set some boundaries, I use Fminbox, i.e., the …

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## [How to expand a polynomial in Symbolics.jl?](https://discourse.julialang.org/t/how-to-expand-a-polynomial-in-symbolics-jl/58530)

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**Author:** [@greatpet](https://discourse.julialang.org/u/greatpet)\
**Replies:** 8\
**Last updated:** [May 12, 2021, 4:28am UTC](https://discourse.julialang.org/t/how-to-expand-a-polynomial-in-symbolics-jl/58530 "2021-05-12T04:28:03Z")

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I’m trying out the package Symbolics.jl. There is a “simplify” function, but not “expand” which is ubiquitous among other CASs. Is this functionality still to be implemented, or hidden somewhere?

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## [Warmstarting variables does not work with Xpress](https://discourse.julialang.org/t/warmstarting-variables-does-not-work-with-xpress/60989)

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**Author:** [@obar](https://discourse.julialang.org/u/obar)\
**Replies:** 3\
**Last updated:** [May 12, 2021, 4:00am UTC](https://discourse.julialang.org/t/warmstarting-variables-does-not-work-with-xpress/60989 "2021-05-12T04:00:19Z")

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Hello, When using the xpress solver through JuMP and the Xpress.jl packages to solve a mixed-integer program, I seem to be unable to warm-start primal variable values using set\_start\_value. Is this expected? Thanks!

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## [Bayes Testing](https://discourse.julialang.org/t/bayes-testing/60373)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 27\
**Last updated:** [May 12, 2021, 3:05am UTC](https://discourse.julialang.org/t/bayes-testing/60373 "2021-05-12T03:05:17Z")

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I tried to add BayesTesting.jl , but apparently it’s gone from GitHub. Is there a packages that does Bayesian t-tests or other hypothesis testsing?

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## [Constraint for scheduling worker to complete task before moving on](https://discourse.julialang.org/t/constraint-for-scheduling-worker-to-complete-task-before-moving-on/60984)

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**Author:** [@eipi10](https://discourse.julialang.org/u/eipi10)\
**Replies:** 3\
**Last updated:** [May 12, 2021, 2:44am UTC](https://discourse.julialang.org/t/constraint-for-scheduling-worker-to-complete-task-before-moving-on/60984 "2021-05-12T02:44:21Z")

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I have a worker-task scheduling problem that I am using a MILP on with JuMP. I want to set a constraint where once a worker starts a task they must complete that task before moving to a new task. I am looking at workers,…

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## [How to use AD for function with multiple inputs?](https://discourse.julialang.org/t/how-to-use-ad-for-function-with-multiple-inputs/60932)

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**Author:** [@amrods](https://discourse.julialang.org/u/amrods)\
**Replies:** 4\
**Last updated:** [May 12, 2021, 12:36am UTC](https://discourse.julialang.org/t/how-to-use-ad-for-function-with-multiple-inputs/60932 "2021-05-12T00:36:24Z")

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Over the past several days I have been struggling with AD for a particular function. I have boiled down the problem to this: using ForwardDiff function F!(resx, resy, x, y) resx\[1\] = 1 - x\[1\] resx\[2\] = 10(x\[2\]-…

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## [PGFPlotsX dependency ArgCheck](https://discourse.julialang.org/t/pgfplotsx-dependency-argcheck/60979)

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**Author:** [@GregR](https://discourse.julialang.org/u/GregR)\
**Replies:** 8\
**Last updated:** [May 11, 2021, 11:36pm UTC](https://discourse.julialang.org/t/pgfplotsx-dependency-argcheck/60979 "2021-05-11T23:36:57Z")

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It looks like the package ArgCheck.jl got deregistered, or whatever happens when the Package Manager doesn’t know about a package. So this breaks PGFPlotsX. I am using Julia 1.6.1. But the github repository is here: …

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## [WGLMakie doesn't display in browser](https://discourse.julialang.org/t/wglmakie-doesnt-display-in-browser/60868)

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**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 2\
**Last updated:** [May 11, 2021, 10:30pm UTC](https://discourse.julialang.org/t/wglmakie-doesnt-display-in-browser/60868 "2021-05-11T22:30:06Z")

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I’m trying to copy the jsserve-wglmakie example. I cloned JSServe.jl, installed WGLMakie and ran JSServe.browser\_display() app = App() do return scatter(1:5,1:5) end display(app) but the page in the bro…

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## [Trying to save MPS from raw solver and problems with MOI.RawSolver()](https://discourse.julialang.org/t/trying-to-save-mps-from-raw-solver-and-problems-with-moi-rawsolver/58515)

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**Author:** [@Henrique\_Becker](https://discourse.julialang.org/u/Henrique_Becker)\
**Replies:** 5\
**Last updated:** [May 11, 2021, 9:16pm UTC](https://discourse.julialang.org/t/trying-to-save-mps-from-raw-solver-and-problems-with-moi-rawsolver/58515 "2021-05-11T21:16:07Z")

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I am having problems with JuMP.write\_to\_file which calls MOI.write\_to\_file. I had some problems using Model with no solver attached (because this calls the MOI function mentioned above and, at the moment, it seems a litt…

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## [Problems with tuples in Statistics function](https://discourse.julialang.org/t/problems-with-tuples-in-statistics-function/60754)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 28\
**Last updated:** [May 11, 2021, 5:31pm UTC](https://discourse.julialang.org/t/problems-with-tuples-in-statistics-function/60754 "2021-05-11T17:31:21Z")

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using Statistics using Distributions x=\[1,2,3,4,5,6,7,8\] y=\[8,4,5,5,6,5,6,5\] function TwoSampleT2Test(X,Y) nx, p = size(X) ny, \_ = size(Y) δ = mean(X, dims=1) - mean(Y, dims=1) Sx = cov(X) Sy = cov(Y)…

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## [Combine CartesianIndices for effective CUDA kernels](https://discourse.julialang.org/t/combine-cartesianindices-for-effective-cuda-kernels/60958)

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**Author:** [@fedoroff](https://discourse.julialang.org/u/fedoroff)\
**Replies:** 4\
**Last updated:** [May 11, 2021, 5:30pm UTC](https://discourse.julialang.org/t/combine-cartesianindices-for-effective-cuda-kernels/60958 "2021-05-11T17:30:46Z")

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Suppose, I have a multidimensional array and I want to perform some operation along one of its axes. A sample generic code can look like this: s = (1, 2, 3, 4, 5) # shape of the array dim = 3 # dimension, along whic…

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## [Dot-product of CuArray views is slow](https://discourse.julialang.org/t/dot-product-of-cuarray-views-is-slow/60953)

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**Author:** [@jlbosse](https://discourse.julialang.org/u/jlbosse)\
**Replies:** 10\
**Last updated:** [May 11, 2021, 4:37pm UTC](https://discourse.julialang.org/t/dot-product-of-cuarray-views-is-slow/60953 "2021-05-11T16:37:15Z")

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I have fairly simple function that iterates over the columns of a 2-dimensional CuArray , takes inner products of these columns and writes them to another matrix. I noticed that running this code on the GPU gave no speed…

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## [Reaching bounds of Distributions.Uniform()](https://discourse.julialang.org/t/reaching-bounds-of-distributions-uniform/60956)

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**Author:** [@goualard-f](https://discourse.julialang.org/u/goualard-f)\
**Replies:** 4\
**Last updated:** [May 11, 2021, 4:05pm UTC](https://discourse.julialang.org/t/reaching-bounds-of-distributions-uniform/60956 "2021-05-11T16:05:07Z")

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The documentation for Distributions.Uniform() states that it allows to draw a value in \[a,b\] (bounds included). Looking into the code, it seems that the rand() function from Base is used along with some affine transforma…

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## [Complicated GMM in Turing.jl - StackOverFlow error](https://discourse.julialang.org/t/complicated-gmm-in-turing-jl-stackoverflow-error/60876)

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**Author:** [@Michaela\_Maskova](https://discourse.julialang.org/u/Michaela_Maskova)\
**Replies:** 4\
**Last updated:** [May 11, 2021, 3:45pm UTC](https://discourse.julialang.org/t/complicated-gmm-in-turing-jl-stackoverflow-error/60876 "2021-05-11T15:45:20Z")

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Hey everyone, I’m trying to create a MGMM model from paper http://proceedings.mlr.press/v15/xiong11a/xiong11a.pdf. The idea is that I have a dataset D = \[G\_1, \\dots, G\_M\], where each group consists of vectors G\_M = \[x\_1…

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## [DiffEqFlux: an error when using NN's that take both time and position as input](https://discourse.julialang.org/t/diffeqflux-an-error-when-using-nns-that-take-both-time-and-position-as-input/60937)

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**Author:** [@SvenDummer](https://discourse.julialang.org/u/SvenDummer)\
**Replies:** 6\
**Last updated:** [May 11, 2021, 11:29am UTC](https://discourse.julialang.org/t/diffeqflux-an-error-when-using-nns-that-take-both-time-and-position-as-input/60937 "2021-05-11T11:29:55Z")

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Hi everyone, I am new to the Julia programming language and ran into an error when programming. My problem: I would like to solve a ODE optimal control problem with a neural network based approach. I take the ODE and r…

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## [What should the default color space for \`YCbCr\` be?](https://discourse.julialang.org/t/what-should-the-default-color-space-for-ycbcr-be/60874)

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**Author:** [@kimikage](https://discourse.julialang.org/u/kimikage)\
**Replies:** 3\
**Last updated:** [May 11, 2021, 10:53am UTC](https://discourse.julialang.org/t/what-should-the-default-color-space-for-ycbcr-be/60874 "2021-05-11T10:53:54Z")

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Hi all, I (we) will make a clarification about the default color space for each color type in the next minor releases of ColorTypes.jl and Colors.jl. Of the color types defined in ColorTypes.jl, the definition of YCbCr …

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## [Memory is not freed with CUDA and two REPLs](https://discourse.julialang.org/t/memory-is-not-freed-with-cuda-and-two-repls/60706)

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**Author:** [@roflmaostc](https://discourse.julialang.org/u/roflmaostc)\
**Replies:** 8\
**Last updated:** [May 7, 2021, 5:03pm UTC](https://discourse.julialang.org/t/memory-is-not-freed-with-cuda-and-two-repls/60706 "2021-05-07T17:03:02Z")

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Hey, I observed that on Julia 1.6.1 and CUDA 3.1.0 (and 2.6.3), I’m accumulating memory (with point wise multiplications) that I can only free when I close the REPL. I also track usage with nvidia-smi and initially ìt …

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## [Disassociate parameter or variable from a model in JuMP](https://discourse.julialang.org/t/disassociate-parameter-or-variable-from-a-model-in-jump/60851)

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**Author:** [@path-doc](https://discourse.julialang.org/u/path-doc)\
**Replies:** 6\
**Last updated:** [May 11, 2021, 12:37am UTC](https://discourse.julialang.org/t/disassociate-parameter-or-variable-from-a-model-in-jump/60851 "2021-05-11T00:37:46Z")

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Suppose I have associated the NLvariable y with the model mod. Then suppose I change my mind and want to disassociate the variable y from mod. Is there something like unset?

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## [MLJ - user defined models - supporting weights - issue?](https://discourse.julialang.org/t/mlj-user-defined-models-supporting-weights-issue/60801)

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**Author:** [@diadora77](https://discourse.julialang.org/u/diadora77)\
**Replies:** 4\
**Last updated:** [May 10, 2021, 9:51pm UTC](https://discourse.julialang.org/t/mlj-user-defined-models-supporting-weights-issue/60801 "2021-05-10T21:51:54Z")

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Hi- I’ve been using MLJ successfully to create some simple custom models using the MLJModelInterface. Recently, I’ve attempted to expand the models to support sample weights for the purpose of implementing a simple adap…

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## [Need help with CUDA.jl installation](https://discourse.julialang.org/t/need-help-with-cuda-jl-installation/52786)

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**Author:** [@maxfreu](https://discourse.julialang.org/u/maxfreu)\
**Replies:** 4\
**Last updated:** [May 10, 2021, 3:52pm UTC](https://discourse.julialang.org/t/need-help-with-cuda-jl-installation/52786 "2021-05-10T15:52:22Z")

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Hi everybody! I had CUDA.jl installed and nicely running past summer, but somehow goofed it up (driver/cuda update?). It is probably not directly related to CUDA.jl. I crawled dmesg for errors, rebooted and nvidia-smi wo…

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## [Plotlyjs - merged legend for both subplots](https://discourse.julialang.org/t/plotlyjs-merged-legend-for-both-subplots/60873)

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**Author:** [@stej](https://discourse.julialang.org/u/stej)\
**Replies:** 4\
**Last updated:** [May 10, 2021, 1:41pm UTC](https://discourse.julialang.org/t/plotlyjs-merged-legend-for-both-subplots/60873 "2021-05-10T13:41:12Z")

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Hi, this is followup of Plotly.js - stacked bars in subplots - #3 by stej I have this code ########### using PlotlyJS, Dates dates = \[Date(2021, 05, 08), Date(2021, 05, 09), Date(2021, 05, 10)\] trace1 = bar(; x = dat…

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## [How to use NLopt with juniper and Alpine](https://discourse.julialang.org/t/how-to-use-nlopt-with-juniper-and-alpine/60857)

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**Author:** [@manoj.centura](https://discourse.julialang.org/u/manoj.centura)\
**Replies:** 9\
**Last updated:** [May 10, 2021, 11:18am UTC](https://discourse.julialang.org/t/how-to-use-nlopt-with-juniper-and-alpine/60857 "2021-05-10T11:18:01Z")

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Hi, Can we use NLopt with juniper/Alpine or any other solver for solving MINLP? Thanks, Manoj

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