# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=408

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 409

---

## [Really small plot picture](https://discourse.julialang.org/t/really-small-plot-picture/18247)

<div class="topic-metadata">

**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 8\
**Last updated:** [November 17, 2020, 5:48am UTC](https://discourse.julialang.org/t/really-small-plot-picture/18247 "2020-11-17T05:48:42Z")

</div>

I’m trying to plot a groupedbar graphic using Statsplots, but i’m getting a really small image, like this: Is there anyway i can plot another groupedbar graphic in this same image? Like above or below that one?

---

## [Request for comments: filenames with metadata](https://discourse.julialang.org/t/request-for-comments-filenames-with-metadata/50266)

<div class="topic-metadata">

**Author:** [@alhirzel](https://discourse.julialang.org/u/alhirzel)\
**Replies:** 1\
**Last updated:** [November 17, 2020, 3:05am UTC](https://discourse.julialang.org/t/request-for-comments-filenames-with-metadata/50266 "2020-11-17T03:05:12Z")

</div>

When managing some bills using a toy framework I’m developing in Julia, I am finding it’s useful to embed some metadata in the filename. I wanted to share an example here for comments: does anyone know of a library in an…

---

## [Makie 3D mesh plot is not as good as before](https://discourse.julialang.org/t/makie-3d-mesh-plot-is-not-as-good-as-before/39808)

<div class="topic-metadata">

**Author:** [@yusri-dh](https://discourse.julialang.org/u/yusri-dh)\
**Replies:** 6\
**Last updated:** [November 16, 2020, 11:16pm UTC](https://discourse.julialang.org/t/makie-3d-mesh-plot-is-not-as-good-as-before/39808 "2020-11-16T23:16:24Z")

</div>

In the Makie v0.10.0, plotting 3D mesh is not as good as before. Here is minimal working example using Makie v0.10.0, shell\> wget https://github.com/libigl/libigl-tutorial-data/raw/master/bumpy-cube.obj using Makie, Fi…

---

## [Sankey diagrams](https://discourse.julialang.org/t/sankey-diagrams/8668)

<div class="topic-metadata">

**Author:** [@Alvaro\_Jose\_Gonzalez](https://discourse.julialang.org/u/Alvaro_Jose_Gonzalez)\
**Replies:** 3\
**Last updated:** [November 16, 2020, 9:48pm UTC](https://discourse.julialang.org/t/sankey-diagrams/8668 "2020-11-16T21:48:30Z")

</div>

Hello everybody, Does anyone know how to create a Sankey diagram in Julia? Thanks! Alvaro

---

## [Krylov subspace polynomial of one right hand side, applied to another](https://discourse.julialang.org/t/krylov-subspace-polynomial-of-one-right-hand-side-applied-to-another/50250)

<div class="topic-metadata">

**Author:** [@raminammour](https://discourse.julialang.org/u/raminammour)\
**Replies:** 0\
**Last updated:** [November 16, 2020, 9:24pm UTC](https://discourse.julialang.org/t/krylov-subspace-polynomial-of-one-right-hand-side-applied-to-another/50250 "2020-11-16T21:24:17Z")

</div>

Hello, A Krylov subspace method (gmres, cg, minres,…) approximates the solution of a linear system, Ax=b. The solution at iteration n is a polynomial in A, applied to the right hand side b: x\_n = P\_n(A,b) b. Note that P…

---

## [Obtain Envelope](https://discourse.julialang.org/t/obtain-envelope/46643)

<div class="topic-metadata">

**Author:** [@carlomontec](https://discourse.julialang.org/u/carlomontec)\
**Replies:** 13\
**Last updated:** [November 16, 2020, 6:55pm UTC](https://discourse.julialang.org/t/obtain-envelope/46643 "2020-11-16T18:55:58Z")

</div>

Hello, is there any function or library to obtain the envelope of a signal ? Thank you all.

---

## [Error with JuMP.model function](https://discourse.julialang.org/t/error-with-jump-model-function/50190)

<div class="topic-metadata">

**Author:** [@erikbjornerem](https://discourse.julialang.org/u/erikbjornerem)\
**Replies:** 2\
**Last updated:** [November 16, 2020, 11:34am UTC](https://discourse.julialang.org/t/error-with-jump-model-function/50190 "2020-11-16T11:34:12Z")

</div>

Hi, I’m relatively new to Julia and the JuMP package. The other day I also got the MathOptInterface package in order to export my LP model as a LP-file to be used in LPsolve by a fellow student. However after doing so I…

---

## [Julia 1.5.1 for Raspian 32 bit (Rasperry Pi)](https://discourse.julialang.org/t/julia-1-5-1-for-raspian-32-bit-rasperry-pi/46969)

<div class="topic-metadata">

**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 4\
**Last updated:** [November 16, 2020, 1:05am UTC](https://discourse.julialang.org/t/julia-1-5-1-for-raspian-32-bit-rasperry-pi/46969 "2020-11-16T01:05:44Z")

</div>

Hello, The last version of Julia for Raspian 32 bit is 1.3.1 . Why are there no newer versions? How can I build a version for Raspian 32 bit myself? Uwe

---

## [\[PSA\] GADM.jl: A julia package providing maps and spatial data for all countries and their sub-divisions](https://discourse.julialang.org/t/psa-gadm-jl-a-julia-package-providing-maps-and-spatial-data-for-all-countries-and-their-sub-divisions/50203)

<div class="topic-metadata">

**Author:** [@yeesian](https://discourse.julialang.org/u/yeesian)\
**Replies:** 0\
**Last updated:** [November 15, 2020, 11:19pm UTC](https://discourse.julialang.org/t/psa-gadm-jl-a-julia-package-providing-maps-and-spatial-data-for-all-countries-and-their-sub-divisions/50203 "2020-11-15T23:19:09Z")

</div>

(Reposting from the #geo channel in Slack) Hi everyone, just wanted to help announce that https://github.com/JuliaGeo/GADM.jl has been released; it is developed by @zerefwayne under https://fellowship.mlh.io/. The packa…

---

## [JuMP: defining objective function uses matrix multiplication](https://discourse.julialang.org/t/jump-defining-objective-function-uses-matrix-multiplication/50169)

<div class="topic-metadata">

**Author:** [@kausban](https://discourse.julialang.org/u/kausban)\
**Replies:** 4\
**Last updated:** [November 15, 2020, 10:52pm UTC](https://discourse.julialang.org/t/jump-defining-objective-function-uses-matrix-multiplication/50169 "2020-11-15T22:52:24Z")

</div>

Hi I am trying to recreate a relatively simple optimization function that I have working with python using (casadi + ipopt). I am having some trouble figuring out how I can describe the objective function since it invol…

---

## [Study of robust optimization](https://discourse.julialang.org/t/study-of-robust-optimization/50062)

<div class="topic-metadata">

**Author:** [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Replies:** 0\
**Last updated:** [November 12, 2020, 6:35pm UTC](https://discourse.julialang.org/t/study-of-robust-optimization/50062 "2020-11-12T18:35:55Z")

</div>

I am studying about robust optimization models in Julia, I found some good examples but they are still not clear to me. Could someone help me by putting a simple example on the reformulation method and on the cut plan m…

---

## [How to make a 3d sphere in Gaston USING THE SET MAPPING SPHERICAL OPTION?](https://discourse.julialang.org/t/how-to-make-a-3d-sphere-in-gaston-using-the-set-mapping-spherical-option/48848)

<div class="topic-metadata">

**Author:** [@ChetanVardhan](https://discourse.julialang.org/u/ChetanVardhan)\
**Replies:** 9\
**Last updated:** [November 15, 2020, 8:02pm UTC](https://discourse.julialang.org/t/how-to-make-a-3d-sphere-in-gaston-using-the-set-mapping-spherical-option/48848 "2020-11-15T20:02:45Z")

</div>

set mapping spherical can be enabled using, surf(x,y,z, Axes(mapping=“spherical”))

---

## [Optim.jl : ParticleSwarm Multithreading at the function level](https://discourse.julialang.org/t/optim-jl-particleswarm-multithreading-at-the-function-level/50117)

<div class="topic-metadata">

**Author:** [@lrnv](https://discourse.julialang.org/u/lrnv)\
**Replies:** 9\
**Last updated:** [November 14, 2020, 9:04pm UTC](https://discourse.julialang.org/t/optim-jl-particleswarm-multithreading-at-the-function-level/50117 "2020-11-14T21:04:16Z")

</div>

Hi, I’m using the PSO algorithm in Optim.jl to minimise a certain loss function, which is a positive multinomial of very high degree (over a constraint domain, a product of several simplexes), and the optimisation is do…

---

## [Help with using ModellingToolkit.jl for evolutionary analysis](https://discourse.julialang.org/t/help-with-using-modellingtoolkit-jl-for-evolutionary-analysis/45943)

<div class="topic-metadata">

**Author:** [@SanAlphaTau](https://discourse.julialang.org/u/SanAlphaTau)\
**Replies:** 7\
**Last updated:** [November 14, 2020, 5:25pm UTC](https://discourse.julialang.org/t/help-with-using-modellingtoolkit-jl-for-evolutionary-analysis/45943 "2020-11-14T17:25:15Z")

</div>

Spawned from earlier question here: SymPy vs Sympy.jl and/or symengine.jl Hello all. I am working on a converting a model written in python using sympy into julia. I posted a previous thread on packages I should use but…

---

## [Strange MaxIters (numeric instability?) occured when solving certain SDE](https://discourse.julialang.org/t/strange-maxiters-numeric-instability-occured-when-solving-certain-sde/49392)

<div class="topic-metadata">

**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 10\
**Last updated:** [November 14, 2020, 3:50pm UTC](https://discourse.julialang.org/t/strange-maxiters-numeric-instability-occured-when-solving-certain-sde/49392 "2020-11-14T15:50:06Z")

</div>

I’ve been solving this equation for a lot of different parameters, but suddenly I am getting occasional ┌ Warning: Interrupted. Larger maxiters is needed. └ @ DiffEqBase /home/torkelloman/.julia/packages/DiffEqBase/V7P1…

---

## [Any Packages for access Google spreadsheet? (gspread, oauth2client)](https://discourse.julialang.org/t/any-packages-for-access-google-spreadsheet-gspread-oauth2client/50139)

<div class="topic-metadata">

**Author:** [@nuclear718](https://discourse.julialang.org/u/nuclear718)\
**Replies:** 4\
**Last updated:** [November 14, 2020, 1:26pm UTC](https://discourse.julialang.org/t/any-packages-for-access-google-spreadsheet-gspread-oauth2client/50139 "2020-11-14T13:26:23Z")

</div>

Do we have any packages can access google spreadsheet ? In python field, there are two packages (gspread, oauth2client) can help user to access google spreadsheet quite easy. But I can not find out any packages for th…

---

## [Merge two dataframes together](https://discourse.julialang.org/t/merge-two-dataframes-together/50137)

<div class="topic-metadata">

**Author:** [@lorrp1](https://discourse.julialang.org/u/lorrp1)\
**Replies:** 1\
**Last updated:** [November 14, 2020, 12:18pm UTC](https://discourse.julialang.org/t/merge-two-dataframes-together/50137 "2020-11-14T12:18:09Z")

</div>

Hello, im trying merging or joining 2 dataframe on the same index. i have just checked this page Joins · DataFrames.jl and it seems all the join require the name of a column, but id like to use the index instead of colu…

---

## [Pixelwise loss weights in Flux?](https://discourse.julialang.org/t/pixelwise-loss-weights-in-flux/49332)

<div class="topic-metadata">

**Author:** [@tlnagy](https://discourse.julialang.org/u/tlnagy)\
**Replies:** 2\
**Last updated:** [November 14, 2020, 7:48am UTC](https://discourse.julialang.org/t/pixelwise-loss-weights-in-flux/49332 "2020-11-14T07:48:49Z")

</div>

Hi all, I’m interested in implementing a pixel-wise loss function in Flux where I would weight up pixels that separate segments from each other to force the network to learn those pixels preferentially. That is, I want …

---

## [Resources for developing probabilistic models? Not syntax, but conceptually](https://discourse.julialang.org/t/resources-for-developing-probabilistic-models-not-syntax-but-conceptually/49501)

<div class="topic-metadata">

**Author:** [@dcgrigsby](https://discourse.julialang.org/u/dcgrigsby)\
**Replies:** 8\
**Last updated:** [November 14, 2020, 7:16am UTC](https://discourse.julialang.org/t/resources-for-developing-probabilistic-models-not-syntax-but-conceptually/49501 "2020-11-14T07:16:25Z")

</div>

I’m interested in creating probabilistic models. Here’s context to frame my question: I’ve got enough adjacent experience to be able to understand tutorials/examples for simple Turing and Gen models for things like co…

---

## [Coulomb and static friction with ModelingToolkit.jl and DifferentialEquations.jl](https://discourse.julialang.org/t/coulomb-and-static-friction-with-modelingtoolkit-jl-and-differentialequations-jl/49802)

<div class="topic-metadata">

**Author:** [@contradict](https://discourse.julialang.org/u/contradict)\
**Replies:** 14\
**Last updated:** [November 13, 2020, 7:24pm UTC](https://discourse.julialang.org/t/coulomb-and-static-friction-with-modelingtoolkit-jl-and-differentialequations-jl/49802 "2020-11-13T19:24:47Z")

</div>

I am trying to create a model of a damped oscillator with friction. It works fine with only Coulomb friction, but all my attempts to add a static friction term have failed so far. Below is the most promising, but I can’t…

---

## [Specify a separate MvNormal for each observation of a variable in Turing](https://discourse.julialang.org/t/specify-a-separate-mvnormal-for-each-observation-of-a-variable-in-turing/50081)

<div class="topic-metadata">

**Author:** [@mkarikom](https://discourse.julialang.org/u/mkarikom)\
**Replies:** 2\
**Last updated:** [November 13, 2020, 3:32pm UTC](https://discourse.julialang.org/t/specify-a-separate-mvnormal-for-each-observation-of-a-variable-in-turing/50081 "2020-11-13T15:32:42Z")

</div>

This MWE is eq.6 from Kyung et al. which features group-wise scaling of the coefficients to facilitate shrinkage, analogous to the grouped lasso. Pretty sure I just messed up the model specification somehow but I also f…

---

## [Using velocity profiles with DiffEqOperators.jl for 2D convection-diffusion problem](https://discourse.julialang.org/t/using-velocity-profiles-with-diffeqoperators-jl-for-2d-convection-diffusion-problem/49243)

<div class="topic-metadata">

**Author:** [@jarias9](https://discourse.julialang.org/u/jarias9)\
**Replies:** 4\
**Last updated:** [November 13, 2020, 3:51pm UTC](https://discourse.julialang.org/t/using-velocity-profiles-with-diffeqoperators-jl-for-2d-convection-diffusion-problem/49243 "2020-11-13T15:51:13Z")

</div>

Hello all. I am trying to discretize and solve the following PDE using DiffEqOperators.jl \\frac{\\partial C}{\\partial t} = D\\nabla^2 C - \\vec{v} \\cdot \\nabla C + R for solving non-steady convection diffusion of a gene…

---

## [Conditional Branching of Parameter in Turing.jl](https://discourse.julialang.org/t/conditional-branching-of-parameter-in-turing-jl/50019)

<div class="topic-metadata">

**Author:** [@nyubachi](https://discourse.julialang.org/u/nyubachi)\
**Replies:** 10\
**Last updated:** [November 13, 2020, 3:07pm UTC](https://discourse.julialang.org/t/conditional-branching-of-parameter-in-turing-jl/50019 "2020-11-13T15:07:16Z")

</div>

I’m new to the Julia language and to modeling, so I may ask a strange question. When estimating parameters in Turing.jl, is it possible to conditionally branch for one parameter with another variable? For example, in t…

---

## [How would one interop with cpp?](https://discourse.julialang.org/t/how-would-one-interop-with-cpp/49733)

<div class="topic-metadata">

**Author:** [@s-kap](https://discourse.julialang.org/u/s-kap)\
**Replies:** 7\
**Last updated:** [November 13, 2020, 4:51am UTC](https://discourse.julialang.org/t/how-would-one-interop-with-cpp/49733 "2020-11-13T04:51:14Z")

</div>

Hey folks, I’d like to use the cpp lib for apache arrow but I’m having a tough time with it. For some context, I’m aware that there is an Arrow.jl package however that only supports the memory format. The cpp lib is ve…

---

## [Solve minimization problem where constraint is the system of linear inequation with MathOptInterface efficiently](https://discourse.julialang.org/t/solve-minimization-problem-where-constraint-is-the-system-of-linear-inequation-with-mathoptinterface-efficiently/23571)

<div class="topic-metadata">

**Author:** [@Yuya-Furusawa](https://discourse.julialang.org/u/Yuya-Furusawa)\
**Replies:** 11\
**Last updated:** [November 12, 2020, 10:29pm UTC](https://discourse.julialang.org/t/solve-minimization-problem-where-constraint-is-the-system-of-linear-inequation-with-mathoptinterface-efficiently/23571 "2020-11-12T22:29:21Z")

</div>

I want to solve min cx s.t. Ax + b \< 0 with MathOptInterface, where A is a matrix and b and c are vectors. However, I couldn’t understand the documentation of MathOptInterface. Currently, my code is as follows: (No…

---

## [@eval with Observable in Interact](https://discourse.julialang.org/t/eval-with-observable-in-interact/50054)

<div class="topic-metadata">

**Author:** [@hagi](https://discourse.julialang.org/u/hagi)\
**Replies:** 0\
**Last updated:** [November 12, 2020, 2:58pm UTC](https://discourse.julialang.org/t/eval-with-observable-in-interact/50054 "2020-11-12T14:58:02Z")

</div>

Hi, I have a problem with Interact, where I don’t understand what is wrong. I have the following MWE. I have a csv file with several columns that might look like this: Result,A\_Result,B\_Result,C\_Result 10,1,3,4 12,3,…

---

## [Using Generalized Likelihood with one dimesional time series as data in DifferentialEquations.jl](https://discourse.julialang.org/t/using-generalized-likelihood-with-one-dimesional-time-series-as-data-in-differentialequations-jl/49989)

<div class="topic-metadata">

**Author:** [@claudio20497](https://discourse.julialang.org/u/claudio20497)\
**Replies:** 1\
**Last updated:** [November 12, 2020, 10:20am UTC](https://discourse.julialang.org/t/using-generalized-likelihood-with-one-dimesional-time-series-as-data-in-differentialequations-jl/49989 "2020-11-12T10:20:36Z")

</div>

I anticipate that this question could be down to my ignorance in statistics. I’m trying to apply the DifferentialEquations.jl tutorial on how to use Generalized Likelihood to a particular case in which the data is a one…

---

## [Using Julia to extract information from a ballot](https://discourse.julialang.org/t/using-julia-to-extract-information-from-a-ballot/47239)

<div class="topic-metadata">

**Author:** [@Nosferican](https://discourse.julialang.org/u/Nosferican)\
**Replies:** 7\
**Last updated:** [November 12, 2020, 10:14am UTC](https://discourse.julialang.org/t/using-julia-to-extract-information-from-a-ballot/47239 "2020-11-12T10:14:13Z")

</div>

I would like to identify tools in the Julia ecosystem to parse a model ballot. For example, from the following PDF, obtain Candidature Candidate’s name Party Affiliation

---

## [DataFrame and Missings.replace()](https://discourse.julialang.org/t/dataframe-and-missings-replace/9834)

<div class="topic-metadata">

**Author:** [@johann.spies](https://discourse.julialang.org/u/johann.spies)\
**Replies:** 10\
**Last updated:** [November 12, 2020, 5:28am UTC](https://discourse.julialang.org/t/dataframe-and-missings-replace/9834 "2020-11-12T05:28:57Z")

</div>

Why does this example (adapted from the DataFrames documentation) work: julia\> x = \[1, 2, missing\] 3-element Array{Union{Int64, Missings.Missing},1}: 1 2 missing julia\> df = collect(Missings.replace(x…

---

## [Workaround for BSON "Inexact: trunc" error for saving very large files?](https://discourse.julialang.org/t/workaround-for-bson-inexact-trunc-error-for-saving-very-large-files/49767)

<div class="topic-metadata">

**Author:** [@CosmoProf](https://discourse.julialang.org/u/CosmoProf)\
**Replies:** 5\
**Last updated:** [November 11, 2020, 11:10pm UTC](https://discourse.julialang.org/t/workaround-for-bson-inexact-trunc-error-for-saving-very-large-files/49767 "2020-11-11T23:10:19Z")

</div>

Hi, I’m experiencing an (apparently known) error using BSON to try to save very large files, where it throws an error: InexactError: trunc(Int32, 2299858984), when the file to be saved is too large. This has been discuss…

[Previous page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=407)

[Next page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=409)