# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=288

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**Page:** 289

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## [Plot without holding data in memory](https://discourse.julialang.org/t/plot-without-holding-data-in-memory/79444)

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**Author:** [@jcarpi](https://discourse.julialang.org/u/jcarpi)\
**Replies:** 6\
**Last updated:** [April 15, 2022, 9:19pm UTC](https://discourse.julialang.org/t/plot-without-holding-data-in-memory/79444 "2022-04-15T21:19:41Z")

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I’d like to overlay hundreds of gigabytes of data onto a single plot. I don’t need this plot to be interactive, I just want to “paint pixels”. Is there any plotting backend, or option with Plots.jl that allows for plott…

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## [How to plot a best fit curve in Julia when the data is a time series?](https://discourse.julialang.org/t/how-to-plot-a-best-fit-curve-in-julia-when-the-data-is-a-time-series/79317)

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**Author:** [@wu-lee](https://discourse.julialang.org/u/wu-lee)\
**Replies:** 2\
**Last updated:** [April 15, 2022, 4:57pm UTC](https://discourse.julialang.org/t/how-to-plot-a-best-fit-curve-in-julia-when-the-data-is-a-time-series/79317 "2022-04-15T16:57:54Z")

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This is a copy of my question here on Stack Overflow (unanswered at the time of writing). I’m trying to plot some measurements over time with a best-fit curve, using Julia’s plotting tools. There’s already a fairly good…

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## [Multitask Learning in Flux](https://discourse.julialang.org/t/multitask-learning-in-flux/79535)

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**Author:** [@Marco\_Repetto](https://discourse.julialang.org/u/Marco_Repetto)\
**Replies:** 2\
**Last updated:** [April 15, 2022, 4:42pm UTC](https://discourse.julialang.org/t/multitask-learning-in-flux/79535 "2022-04-15T16:42:29Z")

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I would like to implement an MTL NN in Flux but is not clear to me how to create a different set of layers for each task. Right now I’m outputting all the tasks in the final layer and using logitcrossentropy loss as all…

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## [Creating a real-time film](https://discourse.julialang.org/t/creating-a-real-time-film/79467)

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**Author:** [@Niall](https://discourse.julialang.org/u/Niall)\
**Replies:** 7\
**Last updated:** [April 15, 2022, 1:35pm UTC](https://discourse.julialang.org/t/creating-a-real-time-film/79467 "2022-04-15T13:35:52Z")

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Hi. I’m relatively new to Julia, but I’m writing a course for students that involves animating plots, so for example plotting a sequence of graphs showing a sine curve that is successively moved to the right, so that it …

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## [Spectral Methods in Julia](https://discourse.julialang.org/t/spectral-methods-in-julia/79506)

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**Author:** [@Veenty](https://discourse.julialang.org/u/Veenty)\
**Replies:** 4\
**Last updated:** [April 15, 2022, 8:54am UTC](https://discourse.julialang.org/t/spectral-methods-in-julia/79506 "2022-04-15T08:54:28Z")

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I want to solve Poisson equation in the ellipse via (pseudo)-spectral methods. I was thinking of using Dedalus via Pycall or something like that. But are there any good alternatives in Julia? Most things that I’ve found…

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## [Strange multithreaded behaviour on ARM Ampere A1 (Oracle Cloud)](https://discourse.julialang.org/t/strange-multithreaded-behaviour-on-arm-ampere-a1-oracle-cloud/79490)

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**Author:** [@Dandan](https://discourse.julialang.org/u/Dandan)\
**Replies:** 10\
**Last updated:** [April 14, 2022, 6:56pm UTC](https://discourse.julialang.org/t/strange-multithreaded-behaviour-on-arm-ampere-a1-oracle-cloud/79490 "2022-04-14T18:56:17Z")

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I’ve tried to run the following simple benchmark in Oracle Cloud VM on an instance with 4 vCPU of ARM Ampere A1 and 24GB ram: using LinearAlgebra function foo() Threads.@threads for i in 1:10000 H = rand(100, 100) +…

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## [How to pass 'ADNLPModels.ReverseDiffAD() as the adbackend keyword argument to the ADNLPModel or ADNLSModel constructor.'](https://discourse.julialang.org/t/how-to-pass-adnlpmodels-reversediffad-as-the-adbackend-keyword-argument-to-the-adnlpmodel-or-adnlsmodel-constructor/79442)

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**Author:** [@Gummala\_Navneeth](https://discourse.julialang.org/u/Gummala_Navneeth)\
**Replies:** 10\
**Last updated:** [April 14, 2022, 8:49pm UTC](https://discourse.julialang.org/t/how-to-pass-adnlpmodels-reversediffad-as-the-adbackend-keyword-argument-to-the-adnlpmodel-or-adnlsmodel-constructor/79442 "2022-04-14T20:49:42Z")

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Hi all, I’m trying to minimize a function which has constraint as nonlinear vector function. input of constraint function is vector and output of constraint function is a vector of large size ( more than 500 elements ) …

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## [OOM when using Flux and loops](https://discourse.julialang.org/t/oom-when-using-flux-and-loops/79468)

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**Author:** [@Fabrice\_Rosay](https://discourse.julialang.org/u/Fabrice_Rosay)\
**Replies:** 4\
**Last updated:** [April 14, 2022, 1:37pm UTC](https://discourse.julialang.org/t/oom-when-using-flux-and-loops/79468 "2022-04-14T13:37:19Z")

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The following code works with actor a residual network of depth 5 and 64 filters if n=1000 (using Flux) But if the lines calling GC are commented, it fails with OOM. Using CUDA 3.9 and Nvidia Driver Version: 510.47.03 …

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## [How to model a chemical reaction network with changing parameters? (Catalyst.jl)](https://discourse.julialang.org/t/how-to-model-a-chemical-reaction-network-with-changing-parameters-catalyst-jl/79489)

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**Author:** [@govissers](https://discourse.julialang.org/u/govissers)\
**Replies:** 5\
**Last updated:** [April 14, 2022, 5:38pm UTC](https://discourse.julialang.org/t/how-to-model-a-chemical-reaction-network-with-changing-parameters-catalyst-jl/79489 "2022-04-14T17:38:12Z")

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Hello, I am hoping to model a chemical reaction network within a cell, where an organism may change the rate of a reaction given an external stimulus at time t. Is it possible to model a CRN wherea reaction constant, sp…

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## [Solve strain for given stress in von Mises plasticity](https://discourse.julialang.org/t/solve-strain-for-given-stress-in-von-mises-plasticity/79501)

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**Author:** [@FrootLoops](https://discourse.julialang.org/u/FrootLoops)\
**Replies:** 0\
**Last updated:** [April 14, 2022, 5:23pm UTC](https://discourse.julialang.org/t/solve-strain-for-given-stress-in-von-mises-plasticity/79501 "2022-04-14T17:23:46Z")

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Hi, I am trying to caculate for a given stress the corresponding strain in the Von Mises plasticity example. I know that this results in a non-linear equation. Not notice I have the following equations: σᵗ = C ⊡ (ϵ - ϵ…

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## [Transferring \*all\* plotted elements (and their links to observables) between Axis](https://discourse.julialang.org/t/transferring-all-plotted-elements-and-their-links-to-observables-between-axis/79492)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 2\
**Last updated:** [April 14, 2022, 2:26pm UTC](https://discourse.julialang.org/t/transferring-all-plotted-elements-and-their-links-to-observables-between-axis/79492 "2022-04-14T14:26:02Z")

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I admit, I’m not particularly optimistic whether this is possible, but here goes. I have a fig, ax, which is an Axis/Axis3 plotted on a Figure. On this axis many things are plotted, and many of the plotted things are ob…

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## [Apply a column of anonymous functions for each column in a column subset](https://discourse.julialang.org/t/apply-a-column-of-anonymous-functions-for-each-column-in-a-column-subset/79402)

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**Author:** [@babaq](https://discourse.julialang.org/u/babaq)\
**Replies:** 11\
**Last updated:** [April 14, 2022, 1:02pm UTC](https://discourse.julialang.org/t/apply-a-column-of-anonymous-functions-for-each-column-in-a-column-subset/79402 "2022-04-14T13:02:50Z")

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Hi, Suppose we have a DataFrame like this: df = DataFrame(name='a':'c',x1=1:3,x2=\[\[1,2\],\[3,4\],\[5,6\]\],xfun=\[x-\>x.-1,x-\>x.^2,x-\>x.^3\]) I want to transform column x1 and x2 in df by apply each fun in xfun for the corresp…

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## [Valid values for attributes: is there a list or a way to look them up?](https://discourse.julialang.org/t/valid-values-for-attributes-is-there-a-list-or-a-way-to-look-them-up/79386)

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**Author:** [@weltenbummler](https://discourse.julialang.org/u/weltenbummler)\
**Replies:** 2\
**Last updated:** [April 14, 2022, 10:40am UTC](https://discourse.julialang.org/t/valid-values-for-attributes-is-there-a-list-or-a-way-to-look-them-up/79386 "2022-04-14T10:40:23Z")

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Hello, In makie, I can look up a list with attributes by e.g. writing fig = Figure() ax = Axis(fig\[1,1\]) ax.attributes It lists the attributes and shows the current settings. However, how can I find out the valid valu…

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## [Time varying input in ReachabilityAnalysis](https://discourse.julialang.org/t/time-varying-input-in-reachabilityanalysis/78419)

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**Author:** [@martincornejo](https://discourse.julialang.org/u/martincornejo)\
**Replies:** 2\
**Last updated:** [April 14, 2022, 10:10am UTC](https://discourse.julialang.org/t/time-varying-input-in-reachabilityanalysis/78419 "2022-04-14T10:10:09Z")

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Let’s take the following example taken from ReachabilityAnalysis’s documentation: https://juliareach.github.io/ReachabilityAnalysis.jl/dev/models/TransmissionLine/#Transmission-line-circuit For the input, it takes the …

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## [PlotlyJS 3d scatter plot does not respect zmin and zmax](https://discourse.julialang.org/t/plotlyjs-3d-scatter-plot-does-not-respect-zmin-and-zmax/79475)

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**Author:** [@Jae-Mo\_Lihm](https://discourse.julialang.org/u/Jae-Mo_Lihm)\
**Replies:** 2\
**Last updated:** [April 14, 2022, 9:15am UTC](https://discourse.julialang.org/t/plotlyjs-3d-scatter-plot-does-not-respect-zmin-and-zmax/79475 "2022-04-14T09:15:38Z")

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How can I fix zmin and zmax in the colorscale? using PlotlyJS PlotlyJS.plot(PlotlyJS.scatter( x=\[0, 1\], y=\[0, 1\], mode="markers", marker=attr( size = 10, color = \[-2, 1\], showscale =…

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## [PyPlot for PythonCall](https://discourse.julialang.org/t/pyplot-for-pythoncall/79407)

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**Author:** [@goerz](https://discourse.julialang.org/u/goerz)\
**Replies:** 3\
**Last updated:** [April 14, 2022, 2:27am UTC](https://discourse.julialang.org/t/pyplot-for-pythoncall/79407 "2022-04-14T02:27:20Z")

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The PyPlot backend for Plots.jl only works with PyCall, right? How hard would it be to make work with PythonCall instead (so I don’t even have to have PyCall installed). I’d very much appreciate the full environment isol…

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## [Makie Unfilled Polygons](https://discourse.julialang.org/t/makie-unfilled-polygons/79440)

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**Author:** [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)\
**Replies:** 4\
**Last updated:** [April 13, 2022, 9:10pm UTC](https://discourse.julialang.org/t/makie-unfilled-polygons/79440 "2022-04-13T21:10:17Z")

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Hi, what is the syntax to plot unfilled/empty polygons (via Makie.poly!) ?

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## [A problem with JuMP variable defined](https://discourse.julialang.org/t/a-problem-with-jump-variable-defined/79365)

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**Author:** [@mahon](https://discourse.julialang.org/u/mahon)\
**Replies:** 2\
**Last updated:** [April 13, 2022, 6:06pm UTC](https://discourse.julialang.org/t/a-problem-with-jump-variable-defined/79365 "2022-04-13T18:06:46Z")

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i want constraint my variable Pg , how can i do?

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## [Distributions.jl: is it possible to define a Normal+Dirac mixture distribution?](https://discourse.julialang.org/t/distributions-jl-is-it-possible-to-define-a-normal-dirac-mixture-distribution/79429)

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**Author:** [@Vincent\_Picaud](https://discourse.julialang.org/u/Vincent_Picaud)\
**Replies:** 6\
**Last updated:** [April 13, 2022, 5:04pm UTC](https://discourse.julialang.org/t/distributions-jl-is-it-possible-to-define-a-normal-dirac-mixture-distribution/79429 "2022-04-13T17:04:11Z")

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I want to manipulate a distribution mixture of the form \\pi\\delta\_{x\_0}+(1-\\pi)\\mathcal{N}(\\mu,\\sigma) I have checked that I can create a mixture of Normal & Cauchy, by example: julia\> using Disributions.jl julia\> M…

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## [Defining Non Linear Vector Constraints in JuMP](https://discourse.julialang.org/t/defining-non-linear-vector-constraints-in-jump/4742)

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**Author:** [@acauligi](https://discourse.julialang.org/u/acauligi)\
**Replies:** 5\
**Last updated:** [April 13, 2022, 3:49pm UTC](https://discourse.julialang.org/t/defining-non-linear-vector-constraints-in-jump/4742 "2022-04-13T15:49:54Z")

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I’m trying to implement pseudospectral methods using JuMP & Ipopt. The state is n-dimensional and control m-dimensional and the values are evaluated at N+1 collocation points; in this particular problem, n=3, m=3, and N …

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## [JuMP problem get conflicting constraints when using small values](https://discourse.julialang.org/t/jump-problem-get-conflicting-constraints-when-using-small-values/79425)

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**Author:** [@this\_josh](https://discourse.julialang.org/u/this_josh)\
**Replies:** 4\
**Last updated:** [April 13, 2022, 2:04pm UTC](https://discourse.julialang.org/t/jump-problem-get-conflicting-constraints-when-using-small-values/79425 "2022-04-13T14:04:04Z")

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In JuMP I’m having problems getting conflicting equality constraints when using small values using JuMP using Gurobi model = Model(Gurobi.Optimizer) @variable(model, x) a = 5e-5 b = 3e-3 @constraint(model, c1, x == 0)…

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## [Broadcasting error diffeqflux](https://discourse.julialang.org/t/broadcasting-error-diffeqflux/79417)

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**Author:** [@YitaoCai](https://discourse.julialang.org/u/YitaoCai)\
**Replies:** 4\
**Last updated:** [April 13, 2022, 9:34am UTC](https://discourse.julialang.org/t/broadcasting-error-diffeqflux/79417 "2022-04-13T09:34:21Z")

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Built a model according to the augmented Neural ODE tutorial as follows: @with\_kw struct Args η = 1e-3 # learning rate λ = 0.01f0 # regularization paramater batch\_size = 64 …

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## [Lots of messages printed out when I evaluate the model using MLJ](https://discourse.julialang.org/t/lots-of-messages-printed-out-when-i-evaluate-the-model-using-mlj/79415)

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**Author:** [@Sijun](https://discourse.julialang.org/u/Sijun)\
**Replies:** 5\
**Last updated:** [April 13, 2022, 5:23am UTC](https://discourse.julialang.org/t/lots-of-messages-printed-out-when-i-evaluate-the-model-using-mlj/79415 "2022-04-13T05:23:36Z")

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I see lots of messages printed out when I evaluate the model: There are "error"s in the printed messeges. Are they really errors? how critical is it? or can I just ignore them? (The evaluation result looks fine thoug…

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## [A problem with SOCP constraint](https://discourse.julialang.org/t/a-problem-with-socp-constraint/79414)

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**Author:** [@mahon](https://discourse.julialang.org/u/mahon)\
**Replies:** 4\
**Last updated:** [April 13, 2022, 5:03am UTC](https://discourse.julialang.org/t/a-problem-with-socp-constraint/79414 "2022-04-13T05:03:41Z")

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I want to formulate a SOCP constraint like this using Mosek and my code here all variables are 32 × 24 matrix，but it pulls a error and if i give the concrete row and columns ，it works

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## [Error Handling in Quote Block using JuMP](https://discourse.julialang.org/t/error-handling-in-quote-block-using-jump/79362)

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**Author:** [@hdavid16](https://discourse.julialang.org/u/hdavid16)\
**Replies:** 10\
**Last updated:** [April 13, 2022, 4:44am UTC](https://discourse.julialang.org/t/error-handling-in-quote-block-using-jump/79362 "2022-04-13T04:44:03Z")

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I am puzzled by the following: using JuMP m = Model() @variable(m,x) code = quote try 1 catch e @NLconstraint($m, 0 .\<= exp($x)) end end eval(code) ERROR: At REPL\[240\]:5: \`@NLconstraint(Fe…

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## [Indexing on Vectorized Constraints in JuMP](https://discourse.julialang.org/t/indexing-on-vectorized-constraints-in-jump/79382)

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**Author:** [@hdavid16](https://discourse.julialang.org/u/hdavid16)\
**Replies:** 4\
**Last updated:** [April 12, 2022, 11:46pm UTC](https://discourse.julialang.org/t/indexing-on-vectorized-constraints-in-jump/79382 "2022-04-12T23:46:21Z")

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I was looking at the example for vectorized constraints in the docs (Constraints · JuMP), which creates the constraint: @constraint(model, con, A \* x .== b) 2-element Vector{ConstraintRef{Model, MathOptInterface.Constr…

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## [Convexity-Preserving Rational Interpolation](https://discourse.julialang.org/t/convexity-preserving-rational-interpolation/79112)

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**Author:** [@liamfdoherty](https://discourse.julialang.org/u/liamfdoherty)\
**Replies:** 11\
**Last updated:** [April 12, 2022, 10:08pm UTC](https://discourse.julialang.org/t/convexity-preserving-rational-interpolation/79112 "2022-04-12T22:08:54Z")

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Hi all! First time poster here. I have a univariate convex function that I would like to optimize. However, it is very expensive to evaluate (due to large variances from Monte Carlo estimation) and I would like to inter…

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## [\[Flux / Zygote\] Circumvent long compilation times](https://discourse.julialang.org/t/flux-zygote-circumvent-long-compilation-times/79385)

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**Author:** [@Tengrath](https://discourse.julialang.org/u/Tengrath)\
**Replies:** 1\
**Last updated:** [April 12, 2022, 8:30pm UTC](https://discourse.julialang.org/t/flux-zygote-circumvent-long-compilation-times/79385 "2022-04-12T20:30:33Z")

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I have implemented a custom physics in model Flux / Zygote to benefit from gradient-based optimization of these great packages. It contains custom layers, each shipping its own ChainRulesCore.rrule. A single model contai…

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## [Suppressing Info blocks from StructuralIdentifiability](https://discourse.julialang.org/t/suppressing-info-blocks-from-structuralidentifiability/79388)

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**Author:** [@bendkok](https://discourse.julialang.org/u/bendkok)\
**Replies:** 6\
**Last updated:** [April 12, 2022, 8:04pm UTC](https://discourse.julialang.org/t/suppressing-info-blocks-from-structuralidentifiability/79388 "2022-04-12T20:04:13Z")

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Hi. I’m using the Julia package StructuralIdentifiability. To use it we first define an ODE-model, and then check the identifiability of its parameters. When I do either of those it prints these “Info:” blocks that take…

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## [Getting constraint matrix from gurobi](https://discourse.julialang.org/t/getting-constraint-matrix-from-gurobi/79107)

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**Author:** [@shsh](https://discourse.julialang.org/u/shsh)\
**Replies:** 5\
**Last updated:** [April 12, 2022, 7:58pm UTC](https://discourse.julialang.org/t/getting-constraint-matrix-from-gurobi/79107 "2022-04-12T19:58:41Z")

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Is there an easy way to obtain the current constraint matrix from gurobi (or the original constraint matrix and inverse of the basis matrix) using MathOptInterface. I have been searching google and only found how to do …

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