# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=246

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**Page:** 247

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## [PhysicsInformedNN: sampling strategy for pde\_loss evaluation on pre-defined could points](https://discourse.julialang.org/t/physicsinformednn-sampling-strategy-for-pde-loss-evaluation-on-pre-defined-could-points/88238)

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**Author:** [@LeoCott](https://discourse.julialang.org/u/LeoCott)\
**Replies:** 1\
**Last updated:** [October 4, 2022, 10:01pm UTC](https://discourse.julialang.org/t/physicsinformednn-sampling-strategy-for-pde-loss-evaluation-on-pre-defined-could-points/88238 "2022-10-04T22:01:27Z")

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Hello all, I am trying to solve an inverse problem with NeuralPDE as presented in the documentation here. I am wondering if it was possible to define a sampling strategy to evaluate the pde\_loss of the NeuralPDE.Physic…

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## [Solving nonlinear equation with an embedded matrix equation](https://discourse.julialang.org/t/solving-nonlinear-equation-with-an-embedded-matrix-equation/88240)

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**Author:** [@yhchang96](https://discourse.julialang.org/u/yhchang96)\
**Replies:** 1\
**Last updated:** [October 4, 2022, 9:54pm UTC](https://discourse.julialang.org/t/solving-nonlinear-equation-with-an-embedded-matrix-equation/88240 "2022-10-04T21:54:52Z")

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I want to find the solution to a nonlinear equation of the form u\_{xx} + f(u,\\lambda) + p= 0 where the unknowns are u(x) and the constant p. There is an addition volume constraint \\int u(x)dx=1. For the leading order pro…

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## [Q: Using Metatheory.jl for code optimization](https://discourse.julialang.org/t/q-using-metatheory-jl-for-code-optimization/88201)

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**Author:** [@Audrius-St](https://discourse.julialang.org/u/Audrius-St)\
**Replies:** 0\
**Last updated:** [October 4, 2022, 2:20am UTC](https://discourse.julialang.org/t/q-using-metatheory-jl-for-code-optimization/88201 "2022-10-04T02:20:28Z")

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Hello, After going through the rather terse Metatheory.jl documentation, there are a number of concepts that are novel and unfamilair to me, so I’m unable to discern if the package can do the following: It is possible …

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## [Questions about XAM.jl](https://discourse.julialang.org/t/questions-about-xam-jl/86665)

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**Author:** [@zhangchunyong](https://discourse.julialang.org/u/zhangchunyong)\
**Replies:** 8\
**Last updated:** [October 4, 2022, 2:12am UTC](https://discourse.julialang.org/t/questions-about-xam-jl/86665 "2022-10-04T02:12:51Z")

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When I used Julia’s package called XAM.jl,I was convinced that it was extraordinarily fast. But when I aligned the reads to the genome and then generated a bam file, how do I restore sequenced reads to undeleted and un…

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## [Makie - more idiomatic way to link x-axes of columns and y-axes of rows](https://discourse.julialang.org/t/makie-more-idiomatic-way-to-link-x-axes-of-columns-and-y-axes-of-rows/88224)

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**Author:** [@cripcate](https://discourse.julialang.org/u/cripcate)\
**Replies:** 0\
**Last updated:** [October 4, 2022, 11:26am UTC](https://discourse.julialang.org/t/makie-more-idiomatic-way-to-link-x-axes-of-columns-and-y-axes-of-rows/88224 "2022-10-04T11:26:37Z")

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Hello everyone. I am trying to create a grid of axes, plot some data into each of them, and then link all the y-axes of each row of plots and all x-axes of each column of plots. The reason for this is that I want to plo…

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## [LiDAR point cloud projects?](https://discourse.julialang.org/t/lidar-point-cloud-projects/22087)

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**Author:** [@Crghilardi](https://discourse.julialang.org/u/Crghilardi)\
**Replies:** 17\
**Last updated:** [October 4, 2022, 8:18am UTC](https://discourse.julialang.org/t/lidar-point-cloud-projects/22087 "2022-10-04T08:18:30Z")

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I wanted to start a discussion to find others that are using Julia for LiDAR point cloud analysis and what the current state of packages is. To summarize my findings so far: LasIO and LazIO seem to be the most current…

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## [\[ANN\] MPI.jl 0.20](https://discourse.julialang.org/t/ann-mpi-jl-0-20/88195)

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**Author:** [@simonbyrne](https://discourse.julialang.org/u/simonbyrne)\
**Replies:** 0\
**Last updated:** [October 3, 2022, 10:37pm UTC](https://discourse.julialang.org/t/ann-mpi-jl-0-20/88195 "2022-10-03T22:37:33Z")

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I’m happy to announce the latest release of MPI.jl, version 0.20. It is our hope that this will serve as a release candidate for future version 1.0. The biggest change by far in this release is the configuration procedu…

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## [Error with bunchkaufman factorization in Turing.jl](https://discourse.julialang.org/t/error-with-bunchkaufman-factorization-in-turing-jl/88174)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 0\
**Last updated:** [October 3, 2022, 5:58pm UTC](https://discourse.julialang.org/t/error-with-bunchkaufman-factorization-in-turing-jl/88174 "2022-10-03T17:58:21Z")

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I have a Turing.jl model that makes use of the LinearAlgebra.bunchkaufman factorization routine. Whenever I try to sample from the posterior, I get the following error message saying that there is no method available wit…

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## [How does @orderby work with multiple columns?](https://discourse.julialang.org/t/how-does-orderby-work-with-multiple-columns/88155)

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**Author:** [@huguesmp](https://discourse.julialang.org/u/huguesmp)\
**Replies:** 3\
**Last updated:** [October 3, 2022, 5:08pm UTC](https://discourse.julialang.org/t/how-does-orderby-work-with-multiple-columns/88155 "2022-10-03T17:08:26Z")

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Hello everyone, I’m a new Julia user coming from an R/dplyr background. I’m going through the “Tutorial for coming from dplyr” on the DataFramesMeta.jl documentation site, specifically the @orderby section using Chain.…

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## [\[ANN\] BetaML v0.8: Model defininition, hyperparameters tuning and fitting in 2 lines](https://discourse.julialang.org/t/ann-betaml-v0-8-model-defininition-hyperparameters-tuning-and-fitting-in-2-lines/88119)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 4\
**Last updated:** [October 3, 2022, 1:56pm UTC](https://discourse.julialang.org/t/ann-betaml-v0-8-model-defininition-hyperparameters-tuning-and-fitting-in-2-lines/88119 "2022-10-03T13:56:05Z")

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Dear all, I’m pleased to announce BetaML v0.8. The Beta Machine Learning Toolkit is a package including many algorithms and utilities to implement machine learning workflows in Julia, with a detailed tutorial on its usa…

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## [Inferring marginal distributions on graphs](https://discourse.julialang.org/t/inferring-marginal-distributions-on-graphs/88159)

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**Author:** [@hbooth](https://discourse.julialang.org/u/hbooth)\
**Replies:** 0\
**Last updated:** [October 3, 2022, 1:36pm UTC](https://discourse.julialang.org/t/inferring-marginal-distributions-on-graphs/88159 "2022-10-03T13:36:59Z")

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Hi all, I am looking for some guidance on how to approach a computational problem I have, hopefully using some of the amazing julia packages! This is early stages, and more conceptual at this point. I want to get some h…

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## [Coupling Sliders in GLMakie](https://discourse.julialang.org/t/coupling-sliders-in-glmakie/88130)

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**Author:** [@lassepe](https://discourse.julialang.org/u/lassepe)\
**Replies:** 4\
**Last updated:** [October 3, 2022, 9:31am UTC](https://discourse.julialang.org/t/coupling-sliders-in-glmakie/88130 "2022-10-03T09:31:34Z")

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I would like to be able to “couple” two sliders of a Makie.SliderGrid so that their value always adds to 1. That is, if I move the first slider I would like to Makie.set\_close\_to!(slider2, 1-slider1.value) and vice versa…

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## [How to avoid recompiling when using job array on a cluster](https://discourse.julialang.org/t/how-to-avoid-recompiling-when-using-job-array-on-a-cluster/88126)

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**Author:** [@neuro\_enthusiast](https://discourse.julialang.org/u/neuro_enthusiast)\
**Replies:** 8\
**Last updated:** [October 2, 2022, 11:09pm UTC](https://discourse.julialang.org/t/how-to-avoid-recompiling-when-using-job-array-on-a-cluster/88126 "2022-10-02T23:09:34Z")

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Hi all, I am trying to run MCMC sampling for a model built with Turing.jl. Since different chains can be sampled in parallel using multiple processes, I want to use the following line: # some lines in my code, model\_si…

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## [Improve a plot done with AoG and Makie](https://discourse.julialang.org/t/improve-a-plot-done-with-aog-and-makie/88133)

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**Author:** [@martinmestre](https://discourse.julialang.org/u/martinmestre)\
**Replies:** 0\
**Last updated:** [October 2, 2022, 8:25pm UTC](https://discourse.julialang.org/t/improve-a-plot-done-with-aog-and-makie/88133 "2022-10-02T20:25:24Z")

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Hello, I have used the following function to make the plot below: """Plot splus stars in the streams footprints""" function plot\_splus\_streams(df::DataFrame, file::String) df.anotta = df.track unicos = unique(d…

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## [New to Julia -- EAGO Nonlinear model works when finding Min but not Max?](https://discourse.julialang.org/t/new-to-julia-eago-nonlinear-model-works-when-finding-min-but-not-max/87757)

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**Author:** [@lying\_syrup](https://discourse.julialang.org/u/lying_syrup)\
**Replies:** 8\
**Last updated:** [October 2, 2022, 7:31pm UTC](https://discourse.julialang.org/t/new-to-julia-eago-nonlinear-model-works-when-finding-min-but-not-max/87757 "2022-10-02T19:31:03Z")

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I’m not sure if a question like this fits more here or on the EAGO GitHub. I’m very new to Julia (started using it three days ago), and I’m also not sure if this is EAGO specific. In short, I’m trying to learn to use th…

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## [Question about the width argument for Gadfly violin plots](https://discourse.julialang.org/t/question-about-the-width-argument-for-gadfly-violin-plots/87339)

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**Author:** [@neuro\_enthusiast](https://discourse.julialang.org/u/neuro_enthusiast)\
**Replies:** 5\
**Last updated:** [October 2, 2022, 3:07pm UTC](https://discourse.julialang.org/t/question-about-the-width-argument-for-gadfly-violin-plots/87339 "2022-10-02T15:07:04Z")

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Hi all, I am trying to adjust the scaling of violin plots from Gadfly. I am trying to play around with the “width” argument but I always get the following message Warning: The following aesthetics are mapped, but not u…

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## [Waterfall Plot Makie.jl](https://discourse.julialang.org/t/waterfall-plot-makie-jl/79988)

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**Author:** [@Rahul](https://discourse.julialang.org/u/Rahul)\
**Replies:** 1\
**Last updated:** [October 2, 2022, 11:37am UTC](https://discourse.julialang.org/t/waterfall-plot-makie-jl/79988 "2022-10-02T11:37:33Z")

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Is it possible to make waterfall plots in Makie.jl, similar to this plotly graph. I am not looking for an interactive graph to start with. Thank you!

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## [Scrambled Halton Draws Package?](https://discourse.julialang.org/t/scrambled-halton-draws-package/36846)

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**Author:** [@jmcastro2109](https://discourse.julialang.org/u/jmcastro2109)\
**Replies:** 2\
**Last updated:** [October 2, 2022, 2:04am UTC](https://discourse.julialang.org/t/scrambled-halton-draws-package/36846 "2022-10-02T02:04:06Z")

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Hello, Is there any package that allows me to draw shuffled Halton draws for simulation of high-dimension integrals? I found and but these don’t seem to provide a shuffling implementation.

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## [CAS Common Chemistry](https://discourse.julialang.org/t/cas-common-chemistry/76429)

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**Author:** [@tp2750](https://discourse.julialang.org/u/tp2750)\
**Replies:** 3\
**Last updated:** [October 1, 2022, 9:14pm UTC](https://discourse.julialang.org/t/cas-common-chemistry/76429 "2022-10-01T21:14:33Z")

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Is there a Julia package for accessing the CAS Common Chemistry database?

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## [Meaning of \`GLM.lm\` results (\`t\` and \`Pr(\>|t|)\`)](https://discourse.julialang.org/t/meaning-of-glm-lm-results-t-and-pr-t/88042)

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**Author:** [@bertulli](https://discourse.julialang.org/u/bertulli)\
**Replies:** 9\
**Last updated:** [October 1, 2022, 4:30pm UTC](https://discourse.julialang.org/t/meaning-of-glm-lm-results-t-and-pr-t/88042 "2022-10-01T16:30:52Z")

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Hi all! This is a very noobish question, I was uncertain if I should put it in “New to Julia” section, so sorry about it. Anyway, when I fit a linear model using the GLM package, like this: using DataFrames using CSV …

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## [Key error when adding a complementarity condition](https://discourse.julialang.org/t/key-error-when-adding-a-complementarity-condition/87810)

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**Author:** [@Mitch\_Phillipson](https://discourse.julialang.org/u/Mitch_Phillipson)\
**Replies:** 6\
**Last updated:** [September 30, 2022, 8:02pm UTC](https://discourse.julialang.org/t/key-error-when-adding-a-complementarity-condition/87810 "2022-09-30T20:02:22Z")

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I’m working to translate some economics models from GAMS into Julia using the Complementarity package and I’m running into an issue where a variable is defined on a larger set than its complementary equation. Here is a s…

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## [Get MIPGap in Gurobi callbacks JuMP 0.21](https://discourse.julialang.org/t/get-mipgap-in-gurobi-callbacks-jump-0-21/37232)

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**Author:** [@bnarum](https://discourse.julialang.org/u/bnarum)\
**Replies:** 5\
**Last updated:** [September 30, 2022, 7:44pm UTC](https://discourse.julialang.org/t/get-mipgap-in-gurobi-callbacks-jump-0-21/37232 "2022-09-30T19:44:23Z")

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Hi I’ve implemented a model with callbacks in Gurobi and experienced that cbget\_mipsol\_obj and cbget\_mipsol\_objbst returns the same value. Nodes | Current Node | Objective Bounds | Work Expl …

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## [Better Way to Filter Strings from DataFrame?](https://discourse.julialang.org/t/better-way-to-filter-strings-from-dataframe/88012)

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**Author:** [@r0b0ty](https://discourse.julialang.org/u/r0b0ty)\
**Replies:** 3\
**Last updated:** [September 30, 2022, 1:28pm UTC](https://discourse.julialang.org/t/better-way-to-filter-strings-from-dataframe/88012 "2022-09-30T13:28:51Z")

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I have a DataFrame containing a column of Strings and a separate, standalone Vector of strings. I want a resulting DataFrame with the rows containing the strings in the standalone vector… basically check the text column …

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## [LsqFit.jl Residuals Interpretation](https://discourse.julialang.org/t/lsqfit-jl-residuals-interpretation/88011)

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**Author:** [@wiseac](https://discourse.julialang.org/u/wiseac)\
**Replies:** 4\
**Last updated:** [September 30, 2022, 8:03am UTC](https://discourse.julialang.org/t/lsqfit-jl-residuals-interpretation/88011 "2022-09-30T08:03:16Z")

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I have a question regarding interpreting the results of a residual plot. Basically light is decaying inside a cell and we are doing an exponential fit to get the decay time (In layman terms) (Cavity RingDown). There are …

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## [Parameters in a JuMP model](https://discourse.julialang.org/t/parameters-in-a-jump-model/87986)

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**Author:** [@Marc\_D](https://discourse.julialang.org/u/Marc_D)\
**Replies:** 3\
**Last updated:** [September 30, 2022, 7:08am UTC](https://discourse.julialang.org/t/parameters-in-a-jump-model/87986 "2022-09-30T07:08:59Z")

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I am new to Julia and uses JuMP to model optimizations problems. I am trying to model a problem with parameters that I could change. I didn’t how to do this and don’t know if it is actually possible to do. More concrete…

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## [Blended Objectives/Linear Combination](https://discourse.julialang.org/t/blended-objectives-linear-combination/88016)

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**Author:** [@sophiepavia](https://discourse.julialang.org/u/sophiepavia)\
**Replies:** 2\
**Last updated:** [September 30, 2022, 1:08am UTC](https://discourse.julialang.org/t/blended-objectives-linear-combination/88016 "2022-09-30T01:08:08Z")

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I am writing a optimization problem where I have a Utilitarian objective and MaxMin Objective. I want to have a third objective that is a linear combination of the two aka a blended objective. I am using Gurobi. My model…

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## [Is there a package for Derivative Observations](https://discourse.julialang.org/t/is-there-a-package-for-derivative-observations/88013)

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**Author:** [@zdc063](https://discourse.julialang.org/u/zdc063)\
**Replies:** 0\
**Last updated:** [September 29, 2022, 10:27pm UTC](https://discourse.julialang.org/t/is-there-a-package-for-derivative-observations/88013 "2022-09-29T22:27:37Z")

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Hello everyone, It is well known that observations on derivatives can be used to train GP. (e.g. https://proceedings.neurips.cc/paper/2002/file/5b8e4fd39d9786228649a8a8bec4e008-Paper.pdf) I wonder whether there is any e…

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## [Quadratic (paraboloid) model fitting](https://discourse.julialang.org/t/quadratic-paraboloid-model-fitting/88007)

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**Author:** [@bertulli](https://discourse.julialang.org/u/bertulli)\
**Replies:** 0\
**Last updated:** [September 29, 2022, 7:37pm UTC](https://discourse.julialang.org/t/quadratic-paraboloid-model-fitting/88007 "2022-09-29T19:37:47Z")

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Hi, this is a off-branch topic from this other thread of mine about multiple linear regression. This is not the solution to the original question, but I thought it’s useful, so I’m making a recap here. Turned out, linea…

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## [Convert Observable Vector of Ranges into Vector of Observable Ranges](https://discourse.julialang.org/t/convert-observable-vector-of-ranges-into-vector-of-observable-ranges/88006)

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**Author:** [@jar1](https://discourse.julialang.org/u/jar1)\
**Replies:** 0\
**Last updated:** [September 29, 2022, 7:09pm UTC](https://discourse.julialang.org/t/convert-observable-vector-of-ranges-into-vector-of-observable-ranges/88006 "2022-09-29T19:09:15Z")

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I have an observable vector of ranges and I want a vector of observable ranges so I can call lines on them. How can I do that? using WGLMakie, LinearAlgebra, Chain, Compat c = Observable(\[5,6,7\]) vertices = map(collect…

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## [Use unitful unit to a variable](https://discourse.julialang.org/t/use-unitful-unit-to-a-variable/88002)

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**Author:** [@filchristou](https://discourse.julialang.org/u/filchristou)\
**Replies:** 7\
**Last updated:** [September 29, 2022, 7:05pm UTC](https://discourse.julialang.org/t/use-unitful-unit-to-a-variable/88002 "2022-09-29T19:05:49Z")

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How can I attach a unit to a variable ? e.g. julia\> using Unitful julia\> 25u"km" #works 25 km julia\> a = 25; # define a variable julia\> #would expect something like that or similar to work julia\> au = @u\_str(a, "km"…

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