# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=357

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

**Page:** 358

---

## [Alpha vs color](https://discourse.julialang.org/t/alpha-vs-color/59445)

<div class="topic-metadata">

**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 5\
**Last updated:** [June 18, 2021, 11:07am UTC](https://discourse.julialang.org/t/alpha-vs-color/59445 "2021-06-18T11:07:19Z")

</div>

In this answer there is band!(x\_plot, mea .- st3, mea .+ st3, color = (:blue, 0.2)) which makes a transparent band but using alpha explicitly doesn’t band!(x\_plot, mea .- st3, mea .+ st3, color = :blue, alpha=0.2)…

---

## [Errors while writing in CuDeviceArray buffers](https://discourse.julialang.org/t/errors-while-writing-in-cudevicearray-buffers/63131)

<div class="topic-metadata">

**Author:** [@koehlerson](https://discourse.julialang.org/u/koehlerson)\
**Replies:** 5\
**Last updated:** [June 18, 2021, 11:07am UTC](https://discourse.julialang.org/t/errors-while-writing-in-cudevicearray-buffers/63131 "2021-06-18T11:07:07Z")

</div>

I have some function which is called by my kernel function foo(F, material, state, buffer,fiber,family) grid = material.convexstrategy.grid grid\_F = material.convexstrategy.grid\_F 𝐠 = material.convexstrategy…

---

## [SGD in Flux.jl](https://discourse.julialang.org/t/sgd-in-flux-jl/63130)

<div class="topic-metadata">

**Author:** [@wujinq](https://discourse.julialang.org/u/wujinq)\
**Replies:** 1\
**Last updated:** [June 18, 2021, 10:30am UTC](https://discourse.julialang.org/t/sgd-in-flux-jl/63130 "2021-06-18T10:30:48Z")

</div>

I’m new to Flux.jl, and I’m kind of confused by the fact that there is no stochastic gradient descent algorithm. I checked the source code, and it seemed to me that Descent is just GD instead of SGD. Of course we can ju…

---

## [Constructing JuMP problems is surprisingly slow](https://discourse.julialang.org/t/constructing-jump-problems-is-surprisingly-slow/63114)

<div class="topic-metadata">

**Author:** [@Samuel\_Ainsworth](https://discourse.julialang.org/u/Samuel_Ainsworth)\
**Replies:** 5\
**Last updated:** [June 17, 2021, 10:29pm UTC](https://discourse.julialang.org/t/constructing-jump-problems-is-surprisingly-slow/63114 "2021-06-17T22:29:30Z")

</div>

I’m in a situation where I’d like to solve a lot of small nonlinear programming problems as quickly as possible. I’ve been surprised to find that JuMP model construction is much slower than I expected. I have a very smal…

---

## [Difference between JuliaDB and DataFrames](https://discourse.julialang.org/t/difference-between-juliadb-and-dataframes/62808)

<div class="topic-metadata">

**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 13\
**Last updated:** [June 17, 2021, 7:45pm UTC](https://discourse.julialang.org/t/difference-between-juliadb-and-dataframes/62808 "2021-06-17T19:45:37Z")

</div>

Is anyone familar to both DataFrames.jl How does JuliaDB.jl compare to DataFrames.jl?

---

## [Issue solving 2D wave equation with ModelingToolkit.jl](https://discourse.julialang.org/t/issue-solving-2d-wave-equation-with-modelingtoolkit-jl/62963)

<div class="topic-metadata">

**Author:** [@apattyn](https://discourse.julialang.org/u/apattyn)\
**Replies:** 19\
**Last updated:** [June 17, 2021, 4:30pm UTC](https://discourse.julialang.org/t/issue-solving-2d-wave-equation-with-modelingtoolkit-jl/62963 "2021-06-17T16:30:25Z")

</div>

Issue I was looking at using ModelingToolkit.jl and was playing around by trying to solve the 2D wave equation. \\frac{d^{2}u}{dt^{2}} = c^{2}\\frac{d^{2}u}{dx^{2}} However, the solution it outputs isn’t what I would ex…

---

## [\[ANN\] DataFramesMeta 0.7.0 release](https://discourse.julialang.org/t/ann-dataframesmeta-0-7-0-release/63084)

<div class="topic-metadata">

**Author:** [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)\
**Replies:** 0\
**Last updated:** [June 17, 2021, 12:45pm UTC](https://discourse.julialang.org/t/ann-dataframesmeta-0-7-0-release/63084 "2021-06-17T12:45:57Z")

</div>

I am happy to announce a new release of DataFramesMeta. This new release contains three important additions @byrow. Being able to better work perform transformations by-row, rather than using broadcasting, has been a l…

---

## [Makie display error when used with VideoIO](https://discourse.julialang.org/t/makie-display-error-when-used-with-videoio/62968)

<div class="topic-metadata">

**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 2\
**Last updated:** [June 17, 2021, 12:36pm UTC](https://discourse.julialang.org/t/makie-display-error-when-used-with-videoio/62968 "2021-06-17T12:36:28Z")

</div>

I am trying to view some video images recorded as mp4 on a cell phone. I have loaded VideoIO and Makie along with the backend GLMakie. I am using Windows 10, Julia 1.6.1 and have tried restarting Julia a few times and …

---

## [Atomic operations stop working when upgrading to CUDA.jl version 3.3](https://discourse.julialang.org/t/atomic-operations-stop-working-when-upgrading-to-cuda-jl-version-3-3/63041)

<div class="topic-metadata">

**Author:** [@gatocor](https://discourse.julialang.org/u/gatocor)\
**Replies:** 4\
**Last updated:** [June 17, 2021, 9:41am UTC](https://discourse.julialang.org/t/atomic-operations-stop-working-when-upgrading-to-cuda-jl-version-3-3/63041 "2021-06-17T09:41:58Z")

</div>

I am developing a library and using CUDA. Because of the new capabilities of CUDA 3.3, I decided to upgrate to Julia 1.6 and now all the test I run fail in kernels depending on atomic operations. I tried to make the mos…

---

## [ModellingToolkit ODESystem definition throwing error](https://discourse.julialang.org/t/modellingtoolkit-odesystem-definition-throwing-error/63002)

<div class="topic-metadata">

**Author:** [@ap2013](https://discourse.julialang.org/u/ap2013)\
**Replies:** 5\
**Last updated:** [June 17, 2021, 8:45am UTC](https://discourse.julialang.org/t/modellingtoolkit-odesystem-definition-throwing-error/63002 "2021-06-17T08:45:14Z")

</div>

I am defining and ODESystem using ModellingToolkit and I am running into a problem in the definition of the equations. The code below is the function to define the ODESystem function connectFFFB\_Grad(plant, ref, pid, m…

---

## [The conflict of variables using @build\_constraint](https://discourse.julialang.org/t/the-conflict-of-variables-using-build-constraint/62998)

<div class="topic-metadata">

**Author:** [@BYS](https://discourse.julialang.org/u/BYS)\
**Replies:** 7\
**Last updated:** [June 17, 2021, 1:58am UTC](https://discourse.julialang.org/t/the-conflict-of-variables-using-build-constraint/62998 "2021-06-17T01:58:19Z")

</div>

Hi, If there are two models in my code model1=Model() @variable(model1,x\[1:5\]) model2=Model() @variable(model2,x\[1:5\]) If I use con=@build\_constraint(x\[1\]\<=1) the x\[1\] belongs to model1 or model2? Thanks in advance…

---

## [Problem with parameter estimation in a epidemiological model](https://discourse.julialang.org/t/problem-with-parameter-estimation-in-a-epidemiological-model/63043)

<div class="topic-metadata">

**Author:** [@fepra](https://discourse.julialang.org/u/fepra)\
**Replies:** 6\
**Last updated:** [June 16, 2021, 11:36pm UTC](https://discourse.julialang.org/t/problem-with-parameter-estimation-in-a-epidemiological-model/63043 "2021-06-16T23:36:46Z")

</div>

Hello, I’m new to Julia. I’m trying to estimate parameter of a system of differential equations for a epidemiological model. I can solve the system but i can’t fit the parameter to my data. function SEAIRD!(du, u, p, t) …

---

## [Having nothing as an outcome using GLPK and JuMP](https://discourse.julialang.org/t/having-nothing-as-an-outcome-using-glpk-and-jump/62948)

<div class="topic-metadata">

**Author:** [@marouane](https://discourse.julialang.org/u/marouane)\
**Replies:** 5\
**Last updated:** [June 16, 2021, 6:41pm UTC](https://discourse.julialang.org/t/having-nothing-as-an-outcome-using-glpk-and-jump/62948 "2021-06-16T18:41:19Z")

</div>

i have this piece of code for optimization: using JuMP using GLPK function scan\_maker(A) m= Model(GLPK.Optimizer) level = size(A, 2) v = zeros(Int, level) ub = zeros(Int, level) lb = zeros(Int…

---

## [Manage spaces in Dataframe/Table column names](https://discourse.julialang.org/t/manage-spaces-in-dataframe-table-column-names/63009)

<div class="topic-metadata">

**Author:** [@Xeos](https://discourse.julialang.org/u/Xeos)\
**Replies:** 7\
**Last updated:** [June 16, 2021, 3:22pm UTC](https://discourse.julialang.org/t/manage-spaces-in-dataframe-table-column-names/63009 "2021-06-16T15:22:10Z")

</div>

Hi, I discovered Julia recently when looking to improve performances of some processes I was running in Python, and most notably while working with dataframes-like structures. I am currently trying to load data from CSV…

---

## [SBML parser](https://discourse.julialang.org/t/sbml-parser/54915)

<div class="topic-metadata">

**Author:** [@Elmo](https://discourse.julialang.org/u/Elmo)\
**Replies:** 4\
**Last updated:** [June 16, 2021, 7:04am UTC](https://discourse.julialang.org/t/sbml-parser/54915 "2021-06-16T07:04:21Z")

</div>

Is anyone actively working on an SBML parser? I saw this and this but can’t find any status updates. I am busy building a Julia version of Cobrapy (much more expansive than COBRA.jl, which seems to be restricted to distr…

---

## [Real quantum device/noisy simulations](https://discourse.julialang.org/t/real-quantum-device-noisy-simulations/62538)

<div class="topic-metadata">

**Author:** [@rodpiferreira](https://discourse.julialang.org/u/rodpiferreira)\
**Replies:** 11\
**Last updated:** [June 15, 2021, 10:37pm UTC](https://discourse.julialang.org/t/real-quantum-device-noisy-simulations/62538 "2021-06-15T22:37:06Z")

</div>

Hello everyone! I’ve recently learned about YaoQuantum, and I began to use it to solve differential equations via quantum algorithms. Although the results were quite interesting, I would like to perform the same simulat…

---

## [How to plot mean +/- deviation in Plots.jl?](https://discourse.julialang.org/t/how-to-plot-mean-deviation-in-plots-jl/1975)

<div class="topic-metadata">

**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 22\
**Last updated:** [June 15, 2021, 6:07pm UTC](https://discourse.julialang.org/t/how-to-plot-mean-deviation-in-plots-jl/1975 "2021-06-15T18:07:05Z")

</div>

Consider the example below: using Plots xs = linspace(1,100) μs = log.(xs) σs = rand(length(xs)) plot(xs,μs,grid=false,yerror=σs) Is there any way to replace the error bars by a shaded transparent area with the sam…

---

## [HDF5: compound data types](https://discourse.julialang.org/t/hdf5-compound-data-types/62699)

<div class="topic-metadata">

**Author:** [@simon-anders](https://discourse.julialang.org/u/simon-anders)\
**Replies:** 1\
**Last updated:** [June 15, 2021, 4:41pm UTC](https://discourse.julialang.org/t/hdf5-compound-data-types/62699 "2021-06-15T16:41:50Z")

</div>

Hi, using Python, I’ve created an HDF5 file with a compound data type. I can read the data in Julia, but I do not manage to create such a file from Julia. Here, I read the file I’ve created in Python: julia\> using HDF…

---

## [PGFPlotsX remove legend box (border)](https://discourse.julialang.org/t/pgfplotsx-remove-legend-box-border/44992)

<div class="topic-metadata">

**Author:** [@AAL](https://discourse.julialang.org/u/AAL)\
**Replies:** 8\
**Last updated:** [June 15, 2021, 2:12pm UTC](https://discourse.julialang.org/t/pgfplotsx-remove-legend-box-border/44992 "2021-06-15T14:12:44Z")

</div>

Hi, I am trying to remove the legend box in a plot with the pgfplotsx backend and I cannot find the right attribute. I know I can easily remove the box in the generated tex file (see here) but I would like to be able to…

---

## [MakieGallery's fate](https://discourse.julialang.org/t/makiegallerys-fate/58131)

<div class="topic-metadata">

**Author:** [@airpmb](https://discourse.julialang.org/u/airpmb)\
**Replies:** 12\
**Last updated:** [June 15, 2021, 2:10pm UTC](https://discourse.julialang.org/t/makiegallerys-fate/58131 "2021-06-15T14:10:01Z")

</div>

According to its README, “MakieGallery is deprecated. Testing got moved to AbstractPlotting, and the Makie documentation contains now important examples.” The Makie docs are OK for learning the basics but MakieGallery w…

---

## [Exporting Cairo Makie to tikz](https://discourse.julialang.org/t/exporting-cairo-makie-to-tikz/62895)

<div class="topic-metadata">

**Author:** [@EvoArt](https://discourse.julialang.org/u/EvoArt)\
**Replies:** 3\
**Last updated:** [June 15, 2021, 11:32am UTC](https://discourse.julialang.org/t/exporting-cairo-makie-to-tikz/62895 "2021-06-15T11:32:27Z")

</div>

I am trying to pycall svg2tikz so that I can build functions to plot CairoMakie to tikz, for seamless integration with LaTeX docs. I’ve edited the post title, as it’s specifically about CairoMakie output now. The follow…

---

## [Help with JuMP syntax for objective function](https://discourse.julialang.org/t/help-with-jump-syntax-for-objective-function/62934)

<div class="topic-metadata">

**Author:** [@Thomas](https://discourse.julialang.org/u/Thomas)\
**Replies:** 2\
**Last updated:** [June 15, 2021, 10:29am UTC](https://discourse.julialang.org/t/help-with-jump-syntax-for-objective-function/62934 "2021-06-15T10:29:42Z")

</div>

When creating a model to solve SDP @variable(model, X\[1:n,1:n\], PSD) @constraint(model, A\*vec(X).==b) @objective(model, Min, c\*vec(X)) I got an error ERROR: MethodError: no method matching \*(::SparseVector{Int64, Int6…

---

## [Free Workshop on Bayesian Statistics using Turing.jl](https://discourse.julialang.org/t/free-workshop-on-bayesian-statistics-using-turing-jl/62571)

<div class="topic-metadata">

**Author:** [@Storopoli](https://discourse.julialang.org/u/Storopoli)\
**Replies:** 5\
**Last updated:** [June 15, 2021, 8:11am UTC](https://discourse.julialang.org/t/free-workshop-on-bayesian-statistics-using-turing-jl/62571 "2021-06-15T08:11:38Z")

</div>

I’ve got invited to give a workshop about Bayesian Inference using Julia and Turing.jl at Stuttgart Julia Programming Language Meetup. Saturday 12th June. The workshop will be using a Reactive Pluto notebook. The code …

---

## [Model of accounts](https://discourse.julialang.org/t/model-of-accounts/62912)

<div class="topic-metadata">

**Author:** [@elgator](https://discourse.julialang.org/u/elgator)\
**Replies:** 1\
**Last updated:** [June 15, 2021, 7:54am UTC](https://discourse.julialang.org/t/model-of-accounts/62912 "2021-06-15T07:54:11Z")

</div>

Hi, I need a piece of architecture advice. I am trying to implement a DSL for financial modelling (3 statement financial model, not the asset-valuaion one). Conceptually the model is quite straitforward: given a number …

---

## [Unsupported constraints in saving JuMP models](https://discourse.julialang.org/t/unsupported-constraints-in-saving-jump-models/62925)

<div class="topic-metadata">

**Author:** [@anon94806364](https://discourse.julialang.org/u/anon94806364)\
**Replies:** 1\
**Last updated:** [June 15, 2021, 6:38am UTC](https://discourse.julialang.org/t/unsupported-constraints-in-saving-jump-models/62925 "2021-06-15T06:38:56Z")

</div>

Are there certain types of JuMP constraints that are not amenable for saving under specific formats? Recently I have converted an ILP from Python to Julia, where I’ve found building the model is significantly faster! I’…

---

## [Efficient way to solve similar optimization problems with JuMP](https://discourse.julialang.org/t/efficient-way-to-solve-similar-optimization-problems-with-jump/62793)

<div class="topic-metadata">

**Author:** [@AtsushiSakai](https://discourse.julialang.org/u/AtsushiSakai)\
**Replies:** 8\
**Last updated:** [June 14, 2021, 11:36pm UTC](https://discourse.julialang.org/t/efficient-way-to-solve-similar-optimization-problems-with-jump/62793 "2021-06-14T23:36:55Z")

</div>

I would like to solve some similar optimization problems, which are mathematical formulation (cost and constraints) are same, but just model parameter values or size of model parameters are different, in JuMP. Currently…

---

## [JuMP+EAGO+@NLexpressions gives numeric instability](https://discourse.julialang.org/t/jump-eago-nlexpressions-gives-numeric-instability/61093)

<div class="topic-metadata">

**Author:** [@blob](https://discourse.julialang.org/u/blob)\
**Replies:** 5\
**Last updated:** [June 14, 2021, 10:38pm UTC](https://discourse.julialang.org/t/jump-eago-nlexpressions-gives-numeric-instability/61093 "2021-06-14T22:38:04Z")

</div>

I want to use EAGO.jl as an alternative solver to ipopt for nonlinear problems. I ran the example from the website (GitHub - PSORLab/EAGO.jl: A development environment for robust and global optimization) and it works fin…

---

## [Makie - Quadrilater-based mesh visualization](https://discourse.julialang.org/t/makie-quadrilater-based-mesh-visualization/62876)

<div class="topic-metadata">

**Author:** [@paurierap](https://discourse.julialang.org/u/paurierap)\
**Replies:** 6\
**Last updated:** [June 14, 2021, 4:55pm UTC](https://discourse.julialang.org/t/makie-quadrilater-based-mesh-visualization/62876 "2021-06-14T16:55:19Z")

</div>

Hi all, Is there any way of plotting a mesh of quadrilaterals using mesh or, alternatively, some way around using other functions?

---

## [Division for Int128 not defined on GPU](https://discourse.julialang.org/t/division-for-int128-not-defined-on-gpu/62797)

<div class="topic-metadata">

**Author:** [@1115](https://discourse.julialang.org/u/1115)\
**Replies:** 3\
**Last updated:** [June 14, 2021, 2:43pm UTC](https://discourse.julialang.org/t/division-for-int128-not-defined-on-gpu/62797 "2021-06-14T14:43:19Z")

</div>

Here is a MWE. julia\> using CUDA julia\> x = widen.(CuArray(rand(Int64, 10))) 10-element CuArray{Int128, 1}: 7760362279116003288 1887985077088633303 -4343813946050421943 -3266615630613073703 2140177075751050950 …

---

## [Plotting a gantt-chart like plot](https://discourse.julialang.org/t/plotting-a-gantt-chart-like-plot/2087)

<div class="topic-metadata">

**Author:** [@bbrunaud](https://discourse.julialang.org/u/bbrunaud)\
**Replies:** 3\
**Last updated:** [June 14, 2021, 12:11pm UTC](https://discourse.julialang.org/t/plotting-a-gantt-chart-like-plot/2087 "2021-06-14T12:11:01Z")

</div>

Hello, I would lie to plot a Gantt chart like the following starting from a dataframe, where each row containts (Task,Unit,InitialTime,Duration,Size) How would you approach this? thanks!

[Previous page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=356)

[Next page](https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=358)