# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=266

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**Page:** 267

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## [Calculation Pi^Pi^Pi in hexadecimal in High precision](https://discourse.julialang.org/t/calculation-pi-pi-pi-in-hexadecimal-in-high-precision/51785)

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**Author:** [@rbdaus](https://discourse.julialang.org/u/rbdaus)\
**Replies:** 61\
**Last updated:** [July 13, 2022, 2:32pm UTC](https://discourse.julialang.org/t/calculation-pi-pi-pi-in-hexadecimal-in-high-precision/51785 "2022-07-13T14:32:51Z")

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Hello! I have a math question. In Wolfram Language I can type this: BaseForm\[N\[Pi^Pi^Pi, 100000\], 16\] and get VERY FAST the result of up to 100,000 hexadecimal digits for the expression “Pi^Pi^Pi” (a few seconds) B…

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## [Elliptic theta functions](https://discourse.julialang.org/t/elliptic-theta-functions/65742)

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**Author:** [@Gabrielmlando](https://discourse.julialang.org/u/Gabrielmlando)\
**Replies:** 15\
**Last updated:** [July 13, 2022, 1:44pm UTC](https://discourse.julialang.org/t/elliptic-theta-functions/65742 "2022-07-13T13:44:26Z")

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Are elliptic theta functions implemented in Julia? They exist in Mathematica as EllipticTheta, but I need them for heavy numerical calculations.

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## [Least-Angle Regression (LARS) package](https://discourse.julialang.org/t/least-angle-regression-lars-package/68424)

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**Author:** [@Frederic\_Gilt](https://discourse.julialang.org/u/Frederic_Gilt)\
**Replies:** 32\
**Last updated:** [July 13, 2022, 1:03pm UTC](https://discourse.julialang.org/t/least-angle-regression-lars-package/68424 "2022-07-13T13:03:34Z")

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Hello I need LARS method and fortunately a package is (was?) available… Unfortunately is has not been updated since several years, so I download the code, remove the call for ArrayViews package which is outdated and doe…

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## [Matrices vs vectors of vectors performance](https://discourse.julialang.org/t/matrices-vs-vectors-of-vectors-performance/84157)

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**Author:** [@Dario-Rosa85](https://discourse.julialang.org/u/Dario-Rosa85)\
**Replies:** 3\
**Last updated:** [July 13, 2022, 12:35pm UTC](https://discourse.julialang.org/t/matrices-vs-vectors-of-vectors-performance/84157 "2022-07-13T12:35:32Z")

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Coming from Mathematica I have been used on thinking about matrices as lists of lists. Hence, I use the same point of view in Julia and, when I have many vectors to be treated homogeneously, I pack them into vectors of v…

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## [How to find jacobian of neural network model for current variables only and not history variables](https://discourse.julialang.org/t/how-to-find-jacobian-of-neural-network-model-for-current-variables-only-and-not-history-variables/84161)

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**Author:** [@umerzakheer](https://discourse.julialang.org/u/umerzakheer)\
**Replies:** 0\
**Last updated:** [July 13, 2022, 11:10am UTC](https://discourse.julialang.org/t/how-to-find-jacobian-of-neural-network-model-for-current-variables-only-and-not-history-variables/84161 "2022-07-13T11:10:32Z")

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My data for training neural network model contains current variables and also history variables to find best fit for non-linear function. Training perfomance is very good and model can predict data with very low error. M…

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## [Degree modification of multivariate polynomial chaos surrogate model](https://discourse.julialang.org/t/degree-modification-of-multivariate-polynomial-chaos-surrogate-model/84145)

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**Author:** [@chenr86](https://discourse.julialang.org/u/chenr86)\
**Replies:** 2\
**Last updated:** [July 13, 2022, 9:00am UTC](https://discourse.julialang.org/t/degree-modification-of-multivariate-polynomial-chaos-surrogate-model/84145 "2022-07-13T09:00:22Z")

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Hello, I am using Surrogate.jl to build my polynomial choas surrogate model. The model is multivariate, with 4 input parameters, and 1D output. I want to change the parameter op = SurrogatesPolyChaos.GaussOrthoPoly(5) o…

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## [Unconstrained optimization problem?](https://discourse.julialang.org/t/unconstrained-optimization-problem/84140)

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**Author:** [@ivzktch99](https://discourse.julialang.org/u/ivzktch99)\
**Replies:** 5\
**Last updated:** [July 13, 2022, 6:43am UTC](https://discourse.julialang.org/t/unconstrained-optimization-problem/84140 "2022-07-13T06:43:11Z")

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I have a control problem that requires (in addition to other linear constraints) finding optimal coefficients M (n \\times n matrix) and a nth dimensional vector b such that \\det(I + xub^T - xM) \\geq 0 for all x \\in \\ma…

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## [Taking the derivative of a scalar loss, that involves a gradient inside, errors on GPU only](https://discourse.julialang.org/t/taking-the-derivative-of-a-scalar-loss-that-involves-a-gradient-inside-errors-on-gpu-only/80275)

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**Author:** [@AlexLewandowski](https://discourse.julialang.org/u/AlexLewandowski)\
**Replies:** 7\
**Last updated:** [July 13, 2022, 5:11am UTC](https://discourse.julialang.org/t/taking-the-derivative-of-a-scalar-loss-that-involves-a-gradient-inside-errors-on-gpu-only/80275 "2022-07-13T05:11:38Z")

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I am working on a meta-learning project and experimenting with MAML. I am able to get a first-order approximation fine, as it can be implemented without differentiating through gradient descent. When doing “full” MAML, I…

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## [Can existing packages for image registration align huge images, e.g. Hubble with the new James Webb images (150 MP)?](https://discourse.julialang.org/t/can-existing-packages-for-image-registration-align-huge-images-e-g-hubble-with-the-new-james-webb-images-150-mp/84118)

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**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 3\
**Last updated:** [July 12, 2022, 10:25pm UTC](https://discourse.julialang.org/t/can-existing-packages-for-image-registration-align-huge-images-e-g-hubble-with-the-new-james-webb-images-150-mp/84118 "2022-07-12T22:25:43Z")

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Like many others I’m drooling over the new images from the JWST, e.g. this one: https://webbtelescope.org/contents/media/images/2022/034/01G7DA5ADA2WDSK1JJPQ0PTG4A So I thought it would be fun to try to align it with o…

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## [Current status of point cloud processing in Julia?](https://discourse.julialang.org/t/current-status-of-point-cloud-processing-in-julia/84119)

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**Author:** [@EricChameroy](https://discourse.julialang.org/u/EricChameroy)\
**Replies:** 1\
**Last updated:** [July 12, 2022, 8:00pm UTC](https://discourse.julialang.org/t/current-status-of-point-cloud-processing-in-julia/84119 "2022-07-12T20:00:12Z")

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I’m working with foot impressions in the form of point cloud data and would like to know if there is anyway to work with this data in Julia? One thing I’d like to do with this data is generate 2D contour plots. Many of …

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## [GeneralizedLinearMixedModel no method matching \_ranef\_refs](https://discourse.julialang.org/t/generalizedlinearmixedmodel-no-method-matching-ranef-refs/82859)

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**Author:** [@jar1](https://discourse.julialang.org/u/jar1)\
**Replies:** 5\
**Last updated:** [June 26, 2022, 5:44pm UTC](https://discourse.julialang.org/t/generalizedlinearmixedmodel-no-method-matching-ranef-refs/82859 "2022-06-26T17:44:53Z")

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How can I fix this error? form = @formula(y ~ (1 | a \* b \* c)) n = 1000 df = DataFrame( y=rand(Bool, n), a=CategoricalArray(rand('a':'z', n)), b=CategoricalArray(rand('a':'z', n)), c=CategoricalArray(…

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## [Error message when using AoG/Makie with "yscale=log10", for my particular data](https://discourse.julialang.org/t/error-message-when-using-aog-makie-with-yscale-log10-for-my-particular-data/82206)

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**Author:** [@martinmestre](https://discourse.julialang.org/u/martinmestre)\
**Replies:** 14\
**Last updated:** [July 12, 2022, 7:43pm UTC](https://discourse.julialang.org/t/error-message-when-using-aog-makie-with-yscale-log10-for-my-particular-data/82206 "2022-07-12T19:43:16Z")

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Hello all, when running the following piece of code, I obtain an error. I have found out that it is due to the fact of using yscale=log10. If I use yscale=log there is no problem. In the x coordinate I have no problem. …

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## [Plotting marks with more one character in Gaston](https://discourse.julialang.org/t/plotting-marks-with-more-one-character-in-gaston/84107)

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**Author:** [@angeloaliano1](https://discourse.julialang.org/u/angeloaliano1)\
**Replies:** 3\
**Last updated:** [July 12, 2022, 3:22pm UTC](https://discourse.julialang.org/t/plotting-marks-with-more-one-character-in-gaston/84107 "2022-07-12T15:22:13Z")

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Dear all, I have the following code to plot several points and marks beside it: using Gaston n=15 L=rand(1:100,n,2) L=\[L 1:n\] scatter(\[L\[1,1\]\], \[L\[1,2\]\],linewidth="3", pointtype="fsquare", plotstyle="linespoints",line…

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## [Maximum likelihood optimization problem through Optim.jl](https://discourse.julialang.org/t/maximum-likelihood-optimization-problem-through-optim-jl/84096)

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**Author:** [@Jian\_ZUO](https://discourse.julialang.org/u/Jian_ZUO)\
**Replies:** 14\
**Last updated:** [July 12, 2022, 1:11pm UTC](https://discourse.julialang.org/t/maximum-likelihood-optimization-problem-through-optim-jl/84096 "2022-07-12T13:11:50Z")

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Hi, I am trying to solve a likelihood function in Optim as follows: I have some increments which are gamma-distributed (Ga(a\*t, β)): det\_x = \[0.0175, 0.0055, 0.0059\] # increments det\_t = \[185, 163, 167\] # correspondi…

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## [Performance of weighed graphs](https://discourse.julialang.org/t/performance-of-weighed-graphs/83661)

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**Author:** [@Jirka\_Fink](https://discourse.julialang.org/u/Jirka_Fink)\
**Replies:** 9\
**Last updated:** [July 12, 2022, 9:02am UTC](https://discourse.julialang.org/t/performance-of-weighed-graphs/83661 "2022-07-12T09:02:38Z")

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I work on combinarotial optimization, so I am looking data structures storing weighed graph. At https://juliagraphs.org/, I found SimpleWeightedGraphs, MetaGraphs, MetaGraphsNext. However, neither of them seems to me t…

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## [Jmathplot via JavaCall.jl](https://discourse.julialang.org/t/jmathplot-via-javacall-jl/69686)

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**Author:** [@Bardo](https://discourse.julialang.org/u/Bardo)\
**Replies:** 3\
**Last updated:** [October 13, 2021, 8:37pm UTC](https://discourse.julialang.org/t/jmathplot-via-javacall-jl/69686 "2021-10-13T20:37:57Z")

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Hi, would be glad if someone could give a hand with the example from https://github.com/yannrichet/jmathplot. jmathplot.jar is in https://github.com/yannrichet/jmathplot/tree/master/dist Got lost in the calling synta…

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## [Sample from csv to build surrogate model](https://discourse.julialang.org/t/sample-from-csv-to-build-surrogate-model/84031)

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**Author:** [@chenr86](https://discourse.julialang.org/u/chenr86)\
**Replies:** 4\
**Last updated:** [July 12, 2022, 6:15am UTC](https://discourse.julialang.org/t/sample-from-csv-to-build-surrogate-model/84031 "2022-07-12T06:15:30Z")

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Hello I attempt to use Surrogate.jl to build a surrogate model of a set of measurement data, coming from a csv file. For the model, there will be 5 inputs and 1 output. I review the user manual of Surrogate.jl and I fin…

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## [Hypernetworks using Flux.destructure?](https://discourse.julialang.org/t/hypernetworks-using-flux-destructure/77211)

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**Author:** [@afishy](https://discourse.julialang.org/u/afishy)\
**Replies:** 10\
**Last updated:** [July 11, 2022, 2:28pm UTC](https://discourse.julialang.org/t/hypernetworks-using-flux-destructure/77211 "2022-07-11T14:28:11Z")

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Flux.destructure provides a nice interface for creating hypernetworks, but I seem to be having trouble with it: it seems to calculate the wrong number of parameters for the dimensions and can’t take the gradient if the h…

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## [Error: Point2f and Point3f not defined](https://discourse.julialang.org/t/error-point2f-and-point3f-not-defined/83920)

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**Author:** [@evandro.schulz](https://discourse.julialang.org/u/evandro.schulz)\
**Replies:** 5\
**Last updated:** [July 11, 2022, 2:16pm UTC](https://discourse.julialang.org/t/error-point2f-and-point3f-not-defined/83920 "2022-07-11T14:16:39Z")

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Hi, I’m trying to use a code that I found in the community. But I cannot run because a error: return (Point3f.(xyzos), Float32.(weights)) ERROR: UndefVarError: Point3f not defined How I can solve one? Mu Julia Version…

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## [CUDA.jl unsupported call to an unknown function, unsupported dynamic function invocation](https://discourse.julialang.org/t/cuda-jl-unsupported-call-to-an-unknown-function-unsupported-dynamic-function-invocation/83997)

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**Author:** [@kongdd](https://discourse.julialang.org/u/kongdd)\
**Replies:** 3\
**Last updated:** [July 11, 2022, 1:31pm UTC](https://discourse.julialang.org/t/cuda-jl-unsupported-call-to-an-unknown-function-unsupported-dynamic-function-invocation/83997 "2022-07-11T13:31:04Z")

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I am trying to translate the following function into the GPU version. But faced with the following error: unsupported call to an unknown function Reason: unsupported dynamic function invocation (call to libcuda) begin …

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## [GPU sparse matrix-vector product with DoubleFloats.jl](https://discourse.julialang.org/t/gpu-sparse-matrix-vector-product-with-doublefloats-jl/84008)

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**Author:** [@geoffroyleconte](https://discourse.julialang.org/u/geoffroyleconte)\
**Replies:** 3\
**Last updated:** [July 11, 2022, 7:43am UTC](https://discourse.julialang.org/t/gpu-sparse-matrix-vector-product-with-doublefloats-jl/84008 "2022-07-11T07:43:00Z")

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Hi, Is it possible to use mul! with a CUDA sparse array and CuVectors using DoubleFloats.jl? The following code leads to scalar indexing: using CUDA, SparseArrays, LinearAlgebra, DoubleFloats CUDA.allowscalar(false) T…

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## [Understanding Gen.jl overhead](https://discourse.julialang.org/t/understanding-gen-jl-overhead/76761)

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**Author:** [@ptotolo](https://discourse.julialang.org/u/ptotolo)\
**Replies:** 2\
**Last updated:** [July 10, 2022, 2:37pm UTC](https://discourse.julialang.org/t/understanding-gen-jl-overhead/76761 "2022-07-10T14:37:00Z")

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I’ve been playing around with Gen.jl for a couple of weeks and one of the things I did was compare its performance to a hand-coded model in order to measure the overhead of the underlying trace data structure, the dynami…

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## [Question on handling product of variables in BilevelJuMP](https://discourse.julialang.org/t/question-on-handling-product-of-variables-in-bileveljump/83375)

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**Author:** [@math\_opt](https://discourse.julialang.org/u/math_opt)\
**Replies:** 3\
**Last updated:** [July 10, 2022, 12:47am UTC](https://discourse.julialang.org/t/question-on-handling-product-of-variables-in-bileveljump/83375 "2022-07-10T00:47:52Z")

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I have a bilevel model where my inner-level problem has terms in constraints and objective that are the product of an upper-level and a lower-level variable. For example, using JuMP, BilevelJuMP, Gurobi model = Bilevel…

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## [Question about problem modifications in Gurobi](https://discourse.julialang.org/t/question-about-problem-modifications-in-gurobi/83963)

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**Author:** [@guilhermebodin](https://discourse.julialang.org/u/guilhermebodin)\
**Replies:** 1\
**Last updated:** [July 9, 2022, 8:02pm UTC](https://discourse.julialang.org/t/question-about-problem-modifications-in-gurobi/83963 "2022-07-09T20:02:40Z")

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There are two ways of changing the RHS of a constraint in Gurobi, one is to directly use MOI.set(model, MOI.ConstraintSet(), ci, new\_set) and the other one would be to make a MOI.modify(model, c, MOI.ScalarConstantChange…

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## [GLMakie.mesh - how to rotate view](https://discourse.julialang.org/t/glmakie-mesh-how-to-rotate-view/83993)

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**Author:** [@trashspam7](https://discourse.julialang.org/u/trashspam7)\
**Replies:** 0\
**Last updated:** [July 9, 2022, 4:23pm UTC](https://discourse.julialang.org/t/glmakie-mesh-how-to-rotate-view/83993 "2022-07-09T16:23:19Z")

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How do I rotate the view for GLMakie.mesh? Specifically, I want to have the x- and y-axes increasing going away from the camera, not towards. I saw in the documentation that there is an attribute model::Makie.Mat4f but …

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## [Test of AMDGPU fails on 5900HX - hipErrorNoBinaryForGpu](https://discourse.julialang.org/t/test-of-amdgpu-fails-on-5900hx-hiperrornobinaryforgpu/83982)

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**Author:** [@jdad](https://discourse.julialang.org/u/jdad)\
**Replies:** 2\
**Last updated:** [July 9, 2022, 4:05pm UTC](https://discourse.julialang.org/t/test-of-amdgpu-fails-on-5900hx-hiperrornobinaryforgpu/83982 "2022-07-09T16:05:59Z")

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I have small server (Minisforum HX90) with Ryzen 5900HX/ Cezanne APU. I successfully installed AMDGPU julia\> AMDGPU.versioninfo() HSA Runtime (ready) - Path: /home/davidj/.julia/artifacts/b1aa837f69ba67b20f9654af56c818e…

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## [Need some help/review on ants model](https://discourse.julialang.org/t/need-some-help-review-on-ants-model/83790)

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**Author:** [@reyman](https://discourse.julialang.org/u/reyman)\
**Replies:** 4\
**Last updated:** [July 9, 2022, 9:14am UTC](https://discourse.julialang.org/t/need-some-help-review-on-ants-model/83790 "2022-07-09T09:14:29Z")

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Hi there, Last year i start to replicate the famous “Ants” model using Agents.jl with version 4.x The result was not bad, see the video and original repo : This year, to finish integration of Julia with…

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## [Optimize a big model containing modules with different stiffness](https://discourse.julialang.org/t/optimize-a-big-model-containing-modules-with-different-stiffness/83530)

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**Author:** [@Amarantine](https://discourse.julialang.org/u/Amarantine)\
**Replies:** 3\
**Last updated:** [July 9, 2022, 4:21am UTC](https://discourse.julialang.org/t/optimize-a-big-model-containing-modules-with-different-stiffness/83530 "2022-07-09T04:21:59Z")

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Hello people! I have a few modules that I connected together as a big model. The modules have different stiffness. For example, module A is not stiff but runs very slowly for each time step (it has a delay component), bu…

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## [Simplex heatmap](https://discourse.julialang.org/t/simplex-heatmap/83640)

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**Author:** [@bryce](https://discourse.julialang.org/u/bryce)\
**Replies:** 15\
**Last updated:** [July 8, 2022, 11:51pm UTC](https://discourse.julialang.org/t/simplex-heatmap/83640 "2022-07-08T23:51:13Z")

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I’m trying to generate a heatmap to visualize the output of a function evaluated on a grid of points over the unit 2-simplex. Here’s an example of the sort of data I’m working with: using Plots, Combinatorics, StatsBase…

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## [Getting around \`Zygote\` mutating array issue](https://discourse.julialang.org/t/getting-around-zygote-mutating-array-issue/83907)

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**Author:** [@pat-alt](https://discourse.julialang.org/u/pat-alt)\
**Replies:** 5\
**Last updated:** [July 8, 2022, 10:23am UTC](https://discourse.julialang.org/t/getting-around-zygote-mutating-array-issue/83907 "2022-07-08T10:23:45Z")

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I’m faced with the Mutating arrays is not supported error message and looking for ideas/help. In particular, I am trying to compute gradients of the following metric that measures diversity across a multi-dimensional arr…

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