# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=24

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**Page:** 25

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## [In Plots.jl \`heatmap\`s, how do I set the colorbar ticks?](https://discourse.julialang.org/t/in-plots-jl-heatmap-s-how-do-i-set-the-colorbar-ticks/132894)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 2\
**Last updated:** [October 6, 2025, 7:48am UTC](https://discourse.julialang.org/t/in-plots-jl-heatmap-s-how-do-i-set-the-colorbar-ticks/132894 "2025-10-06T07:48:48Z")

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if I create a heatmap: using Plots heatmap(rand(5,5); clim = (0.0, 1.0)) How do I set the ticks on the colorbar? I.e. if I would have wanted it to be \[0.0, 0.25, 0.5, 0.75, 1.0\]?

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## [How do I put the heatmap colorbar at the top of the plot?](https://discourse.julialang.org/t/how-do-i-put-the-heatmap-colorbar-at-the-top-of-the-plot/132893)

<div class="topic-metadata">

**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 2\
**Last updated:** [October 6, 2025, 7:48am UTC](https://discourse.julialang.org/t/how-do-i-put-the-heatmap-colorbar-at-the-top-of-the-plot/132893 "2025-10-06T07:48:38Z")

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using the Plots package. I looked here: Cannot change colorbar position, which does suggest that heatmap(rand(5,5); cb=:top) should work, however, it does not. Might be that it requires the pgfplot backend, but seems …

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## [Parameterization of a set of constraints](https://discourse.julialang.org/t/parameterization-of-a-set-of-constraints/132885)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 8\
**Last updated:** [October 5, 2025, 9:21pm UTC](https://discourse.julialang.org/t/parameterization-of-a-set-of-constraints/132885 "2025-10-05T21:21:42Z")

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I would like, if possible, to parameterize the following set of constraints. I would like to replace the fixed values ​​4 in 4:ng; 3 in g-3:g; and 1 in … \<=1 with parameters external to the function that define the mo…

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## [Differentiation of incomplete Beta function](https://discourse.julialang.org/t/differentiation-of-incomplete-beta-function/49675)

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**Author:** [@arzwa](https://discourse.julialang.org/u/arzwa)\
**Replies:** 4\
**Last updated:** [October 5, 2025, 12:55pm UTC](https://discourse.julialang.org/t/differentiation-of-incomplete-beta-function/49675 "2025-10-05T12:55:22Z")

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First, to give some context: my use case is equivalent to the following contrived example, in which I would like to define a (Turing.jl) probabilistic program that uses a discretized Beta mixture model. @model themodel(…

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## [Plot several shapes as part of a single series using Plots.jl](https://discourse.julialang.org/t/plot-several-shapes-as-part-of-a-single-series-using-plots-jl/132878)

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**Author:** [@alan](https://discourse.julialang.org/u/alan)\
**Replies:** 2\
**Last updated:** [October 5, 2025, 12:17pm UTC](https://discourse.julialang.org/t/plot-several-shapes-as-part-of-a-single-series-using-plots-jl/132878 "2025-10-05T12:17:15Z")

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I’m trying to plot several rectangles of the same color, and I want them to show up as a single entry in the legend. But my code produces a separate legend entry for each rectangle. Suggestions? using Plots function re…

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## [Plots.Heatmap: how to set colour of NaN values?](https://discourse.julialang.org/t/plots-heatmap-how-to-set-colour-of-nan-values/132873)

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**Author:** [@dankelley](https://discourse.julialang.org/u/dankelley)\
**Replies:** 2\
**Last updated:** [October 4, 2025, 2:19pm UTC](https://discourse.julialang.org/t/plots-heatmap-how-to-set-colour-of-nan-values/132873 "2025-10-04T14:19:50Z")

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I tried the following, which I thought would have a red box in the middle. But the box is white. Is there a way for me to control this? (Note: I’m a newbie, and sticking to base Plots for now. I’m hoping to not have m…

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## [Is there a migration from DifferentialEquations.jl to subpackages cheat sheet?](https://discourse.julialang.org/t/is-there-a-migration-from-differentialequations-jl-to-subpackages-cheat-sheet/132852)

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**Author:** [@JonasWickman](https://discourse.julialang.org/u/JonasWickman)\
**Replies:** 3\
**Last updated:** [October 4, 2025, 4:25am UTC](https://discourse.julialang.org/t/is-there-a-migration-from-differentialequations-jl-to-subpackages-cheat-sheet/132852 "2025-10-04T04:25:56Z")

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I use a lot of different functionality in DifferentialEquations.jl, so to date I’ve been mostly happy just using this omnipackage. However, compile times are now quite long and I rarely need all the functionality in the …

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## [ModelingToolkit + matrix variables: defaults & 1×1 scalars](https://discourse.julialang.org/t/modelingtoolkit-matrix-variables-defaults-1x1-scalars/132825)

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**Author:** [@rasmuskovacs](https://discourse.julialang.org/u/rasmuskovacs)\
**Replies:** 4\
**Last updated:** [October 3, 2025, 12:34pm UTC](https://discourse.julialang.org/t/modelingtoolkit-matrix-variables-defaults-1x1-scalars/132825 "2025-10-03T12:34:13Z")

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Hi! I’m trying to use ModelingToolkit with matrix variables/parameters. I’ve got it working, but I need to be very careful about how I define things, and a couple behaviors feel non-intuitive. I’m wondering if I’m missin…

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## [Makie font variants?](https://discourse.julialang.org/t/makie-font-variants/132818)

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**Author:** [@ryofurue](https://discourse.julialang.org/u/ryofurue)\
**Replies:** 9\
**Last updated:** [October 3, 2025, 4:43am UTC](https://discourse.julialang.org/t/makie-font-variants/132818 "2025-10-03T04:43:18Z")

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I’m trying to find out how to specify font variants. The following attempt fails: using CairoMakie fig = Figure(; fonts = ( regular = "Baskerville", italic = "Baskerville Italic", )) ax = Axis(fig\[1, 1\]) text…

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## [Updating the QR decomposition of a matrix under rank-1updates](https://discourse.julialang.org/t/updating-the-qr-decomposition-of-a-matrix-under-rank-1updates/132831)

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**Author:** [@Gattu\_Mytraya](https://discourse.julialang.org/u/Gattu_Mytraya)\
**Replies:** 3\
**Last updated:** [October 3, 2025, 12:47am UTC](https://discourse.julialang.org/t/updating-the-qr-decomposition-of-a-matrix-under-rank-1updates/132831 "2025-10-03T00:47:05Z")

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Hi, I was trying to find a native julia implementation of the QR decomposition of a matrix A when it is changed from A to A + uv^{T} - under a rank-1 update. I found multiple packages for updating the QR decomp (and jus…

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## [Dyad Builder, FMUs](https://discourse.julialang.org/t/dyad-builder-fmus/132792)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 10\
**Last updated:** [October 2, 2025, 6:12am UTC](https://discourse.julialang.org/t/dyad-builder-fmus/132792 "2025-10-02T06:12:03Z")

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I attended a webinar from Juliahub today on the topic of creating functional mockup units (FMUs) using Julia and Dyad. Questions: Is this feature available for academic users of Dyad Studio? Is the graphical model edi…

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## [Speeding up N-dimensional integration](https://discourse.julialang.org/t/speeding-up-n-dimensional-integration/132782)

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**Author:** [@owiecc](https://discourse.julialang.org/u/owiecc)\
**Replies:** 14\
**Last updated:** [October 1, 2025, 2:17pm UTC](https://discourse.julialang.org/t/speeding-up-n-dimensional-integration/132782 "2025-10-01T14:17:14Z")

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I am struggling to speed up a N-dimensional integration problem. To me it looks that allocations are the problem. I chased as many allocations I could find in the code but I still would like to speed-up the code by at le…

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## [Non-convergent "weighted" objective function](https://discourse.julialang.org/t/non-convergent-weighted-objective-function/132785)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 16\
**Last updated:** [October 1, 2025, 7:17am UTC](https://discourse.julialang.org/t/non-convergent-weighted-objective-function/132785 "2025-10-01T07:17:44Z")

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I need to find a way to allocate a pool of resources to perform a series of daily services over the course of a month. There are obviously a long series of general (for all resources) and specific (for individual resour…

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## [HTTP returns an error in Julia 1.11.1](https://discourse.julialang.org/t/http-returns-an-error-in-julia-1-11-1/122312)

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**Author:** [@wshobe](https://discourse.julialang.org/u/wshobe)\
**Replies:** 11\
**Last updated:** [October 1, 2025, 4:02am UTC](https://discourse.julialang.org/t/http-returns-an-error-in-julia-1-11-1/122312 "2025-10-01T04:02:07Z")

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I have just updated to Julia 1.11.1 and HTTP is now returning an error, where it worked before the update. Any thoughts would be appreciated. The call is very simple: resp = HTTP.request("GET", "http://httpbin.org/ip")…

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## [How to implement a FFT based 2D laplacian in SciMLOperators.jl?](https://discourse.julialang.org/t/how-to-implement-a-fft-based-2d-laplacian-in-scimloperators-jl/132143)

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**Author:** [@marcsgil](https://discourse.julialang.org/u/marcsgil)\
**Replies:** 1\
**Last updated:** [September 30, 2025, 4:51pm UTC](https://discourse.julialang.org/t/how-to-implement-a-fft-based-2d-laplacian-in-scimloperators-jl/132143 "2025-09-30T16:51:58Z")

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Hello! I was trying to implement a FFT based 2D laplacian in SciMLOperators.jl, but I ran into some trouble. Here is my attempt, which was based in this example in the docs: using SciMLOperators using LinearAlgebra, FF…

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## [Relationship between OptimalControl.jl and ControlSystems.jl](https://discourse.julialang.org/t/relationship-between-optimalcontrol-jl-and-controlsystems-jl/116959)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 5\
**Last updated:** [September 30, 2025, 12:20pm UTC](https://discourse.julialang.org/t/relationship-between-optimalcontrol-jl-and-controlsystems-jl/116959 "2025-09-30T12:20:38Z")

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At JuliaCon 2024 I learned about the package OptimalControl.jl and related. To install them, you need to add a custom registry: pkg\> registry add https://github.com/control-toolbox/ct-registry.git pkg\> add OptimalContr…

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## [Problem about solution of Gurobi in Julia in JUMP](https://discourse.julialang.org/t/problem-about-solution-of-gurobi-in-julia-in-jump/130926)

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**Author:** [@Z\_M](https://discourse.julialang.org/u/Z_M)\
**Replies:** 5\
**Last updated:** [September 29, 2025, 7:52pm UTC](https://discourse.julialang.org/t/problem-about-solution-of-gurobi-in-julia-in-jump/130926 "2025-09-29T19:52:18Z")

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​Hi guys! I use Gurobi in Julia in JUMP. The model has linear constraints and second-order cone constraints. However, the “termination\_status” is：locally\_solved, sometimes is numerous error. Why and how to solve this p…

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## [Removing tick labels but increasing tick size in Plots.jl](https://discourse.julialang.org/t/removing-tick-labels-but-increasing-tick-size-in-plots-jl/132732)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 2\
**Last updated:** [September 29, 2025, 2:18pm UTC](https://discourse.julialang.org/t/removing-tick-labels-but-increasing-tick-size-in-plots-jl/132732 "2025-09-29T14:18:43Z")

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In Plots.jl, is there a way to remove the tick labels (i.e. 0.25, 0.5), but have the tick marks remain? Even better, is there then a way to increase the size of he tick markers?

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## [Replacing a node in a ComputeGraph (Makie)](https://discourse.julialang.org/t/replacing-a-node-in-a-computegraph-makie/132743)

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**Author:** [@rasmushenningsson](https://discourse.julialang.org/u/rasmushenningsson)\
**Replies:** 3\
**Last updated:** [September 29, 2025, 2:05pm UTC](https://discourse.julialang.org/t/replacing-a-node-in-a-computegraph-makie/132743 "2025-09-29T14:05:48Z")

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Is there any way to replace a node in a ComputeGraph? Let’s say I want to replace an input node with a computed value, but I do not want to delete all the dependent nodes and recreate them. Example Given this graph: g…

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## [Solving a non-linear P(I)DE - neural field equation](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-neural-field-equation/132678)

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**Author:** [@jucheval](https://discourse.julialang.org/u/jucheval)\
**Replies:** 3\
**Last updated:** [September 29, 2025, 8:53am UTC](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-neural-field-equation/132678 "2025-09-29T08:53:16Z")

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Hi everyone ! I am searching for some way to solve the following non linear P(I)DE, known as the neural field equation: \\frac{\\partial}{\\partial\_t} u(t,x) = -\\alpha u(t,x) + \\int w(y,x) f(u(t,y)) dy, for some scalar \\…

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## [Solving a non-linear P(I)DE - age-structured equation](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-age-structured-equation/132677)

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**Author:** [@jucheval](https://discourse.julialang.org/u/jucheval)\
**Replies:** 5\
**Last updated:** [September 29, 2025, 8:51am UTC](https://discourse.julialang.org/t/solving-a-non-linear-p-i-de-age-structured-equation/132677 "2025-09-29T08:51:02Z")

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Hi everyone ! I am searching for some way to solve the following non-linear P(I)DE, known as the refractory density equation or age-structured equation: \\begin{cases} \\frac{\\partial}{\\partial\_t} u(t,a) + \\frac{\\pa…

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## [How to model an implication](https://discourse.julialang.org/t/how-to-model-an-implication/132617)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 24\
**Last updated:** [September 28, 2025, 9:17pm UTC](https://discourse.julialang.org/t/how-to-model-an-implication/132617 "2025-09-28T21:17:31Z")

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Suppose we have a two-dimensional binary variable x. Let, for example, be two-dimensional with n x m rows and columns. a) How can I express, in linear terms, a constraint of the following type? # sum(x\[1,:\])== 5 =\> su…

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## [Confusion about BioJulia site?](https://discourse.julialang.org/t/confusion-about-biojulia-site/132708)

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**Author:** [@Marco\_Antoniotti](https://discourse.julialang.org/u/Marco_Antoniotti)\
**Replies:** 2\
**Last updated:** [September 28, 2025, 9:08am UTC](https://discourse.julialang.org/t/confusion-about-biojulia-site/132708 "2025-09-28T09:08:23Z")

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Hi I am back to BioJulia and I see that the main indexed site appears to be https://biojulia.dev. Alas, that appears… old (2024). OTOH, there is a BioJulia Unified Docs which appears to be up to date. What gives? Al…

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## [Is there a functional substitute for JuMP.@variable?](https://discourse.julialang.org/t/is-there-a-functional-substitute-for-jump-variable/132669)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 7\
**Last updated:** [September 27, 2025, 1:17am UTC](https://discourse.julialang.org/t/is-there-a-functional-substitute-for-jump-variable/132669 "2025-09-27T01:17:52Z")

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I think there is a basic criterion: macros should yield to functions whenever possible I know it is necessary to have macros build expressions, e.g. JuMP.@expression(m, sum(c\[i\]x\[i\] for i = 1:I)) since the last arg …

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## [Finding all zeros of a univariate function on the real line](https://discourse.julialang.org/t/finding-all-zeros-of-a-univariate-function-on-the-real-line/132565)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 5\
**Last updated:** [September 26, 2025, 10:23pm UTC](https://discourse.julialang.org/t/finding-all-zeros-of-a-univariate-function-on-the-real-line/132565 "2025-09-26T22:23:51Z")

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I am trying to find all zeros of f(z) = C\_m + D\_m H(C\_f + D\_f H(z)) - z where C\_i, D\_i \\in \\mathbb{R} (can be any sign) and H is the CDF of the standard normal. If someone wants to experiment, this can be coded in Ju…

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## [Constructing a chemical reaction network from an ode system](https://discourse.julialang.org/t/constructing-a-chemical-reaction-network-from-an-ode-system/132682)

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**Author:** [@adhalanay](https://discourse.julialang.org/u/adhalanay)\
**Replies:** 1\
**Last updated:** [September 26, 2025, 8:02pm UTC](https://discourse.julialang.org/t/constructing-a-chemical-reaction-network-from-an-ode-system/132682 "2025-09-26T20:02:36Z")

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The so called Hungarian Lemma states that a system of ODEs with polynomial RHS x'\_j =f\_j(x),j=\\overline{1,n} comes from a mass-action chemical reaction network if and only if all the negative monomials of f\_f have x\_j …

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## [\[Oxygen.jl\] returning plots to user](https://discourse.julialang.org/t/oxygen-jl-returning-plots-to-user/126341)

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**Author:** [@braamvandyk](https://discourse.julialang.org/u/braamvandyk)\
**Replies:** 4\
**Last updated:** [September 26, 2025, 4:08am UTC](https://discourse.julialang.org/t/oxygen-jl-returning-plots-to-user/126341 "2025-09-26T04:08:09Z")

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Hi all My first attempt at putting together a browser-based interface and also any form of web programming, so I really don’t know what it is that I don’t know. Apologies for asking the obvious. I am using Oxygen.jl for…

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## [What lessons could Julia's autodiff ecosystem learn from Stan's TinyGrad?](https://discourse.julialang.org/t/what-lessons-could-julias-autodiff-ecosystem-learn-from-stans-tinygrad/103070)

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**Author:** [@mbauman](https://discourse.julialang.org/u/mbauman)\
**Replies:** 45\
**Last updated:** [September 26, 2025, 1:16am UTC](https://discourse.julialang.org/t/what-lessons-could-julias-autodiff-ecosystem-learn-from-stans-tinygrad/103070 "2025-09-26T01:16:10Z")

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This came up in the What steps should the Julia community take to bring Julia to the next level of popularity? megathread and I think it’s worth having a dedicated topic on the point. I’ll merge some existing posts into…

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## [Reactant.jl compile times and memory usage](https://discourse.julialang.org/t/reactant-jl-compile-times-and-memory-usage/132655)

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**Author:** [@f.ij](https://discourse.julialang.org/u/f.ij)\
**Replies:** 9\
**Last updated:** [September 25, 2025, 9:39pm UTC](https://discourse.julialang.org/t/reactant-jl-compile-times-and-memory-usage/132655 "2025-09-25T21:39:41Z")

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I’m trying to do some ML experiments using Lux and Reactant. Without posting all of the code, I was wondering if I’m using Reactant properly, because I’m getting compile times of around 3 minutes, and gigabytes of memory…

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## [GLMakie via Remote Desktop on Windows 11](https://discourse.julialang.org/t/glmakie-via-remote-desktop-on-windows-11/132658)

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**Author:** [@dami](https://discourse.julialang.org/u/dami)\
**Replies:** 0\
**Last updated:** [September 25, 2025, 3:20pm UTC](https://discourse.julialang.org/t/glmakie-via-remote-desktop-on-windows-11/132658 "2025-09-25T15:20:55Z")

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I’m running into an issue with GLMakie on Windows 11 when accessing via Remote Desktop. Here’s the situation: On a Win10 machine, when I connect via RDP, I have no problems: I can run my code and GLMakie rendering is …

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