# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=339

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**Page:** 340

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## [Transparent plotting in Makie](https://discourse.julialang.org/t/transparent-plotting-in-makie/67625)

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**Author:** [@yosuga](https://discourse.julialang.org/u/yosuga)\
**Replies:** 9\
**Last updated:** [September 4, 2021, 9:42am UTC](https://discourse.julialang.org/t/transparent-plotting-in-makie/67625 "2021-09-04T09:42:12Z")

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BeautifulMakie is very helpful for 3D plotting. But, in this volume with scatters, x,y,z, f(x,y,z) example, I can’t see inside the box e.g. the values at (x,y,z)=(5,5,5) or (0,0,0). I want something like this example,“D…

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## [Best way to define a set of differential equations?](https://discourse.julialang.org/t/best-way-to-define-a-set-of-differential-equations/67650)

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**Author:** [@pafloxy](https://discourse.julialang.org/u/pafloxy)\
**Replies:** 6\
**Last updated:** [September 4, 2021, 9:11am UTC](https://discourse.julialang.org/t/best-way-to-define-a-set-of-differential-equations/67650 "2021-09-04T09:11:06Z")

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Hi! I am using DifferentialEquations.jl for simulating trajectories over high-dimensional vector fields. For my case, the time-evolution function for each coordinate is generated by a pre-defined random function (\*\* sa…

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## [Why don't remotecalls to a WorkerPool block when all workers are busy?](https://discourse.julialang.org/t/why-dont-remotecalls-to-a-workerpool-block-when-all-workers-are-busy/22059)

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**Author:** [@Cody-G](https://discourse.julialang.org/u/Cody-G)\
**Replies:** 6\
**Last updated:** [September 3, 2021, 7:09pm UTC](https://discourse.julialang.org/t/why-dont-remotecalls-to-a-workerpool-block-when-all-workers-are-busy/22059 "2021-09-03T19:09:20Z")

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Based on the docs for remotecall I expect the WorkerPool variant to block until a worker in the pool is available for a new job. From docs: remotecall(f, pool::AbstractWorkerPool, args...; kwargs...) -\> Future Work…

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## [How to exchange x-y axis and layout with another image?](https://discourse.julialang.org/t/how-to-exchange-x-y-axis-and-layout-with-another-image/67615)

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**Author:** [@thudjx](https://discourse.julialang.org/u/thudjx)\
**Replies:** 3\
**Last updated:** [September 3, 2021, 5:52pm UTC](https://discourse.julialang.org/t/how-to-exchange-x-y-axis-and-layout-with-another-image/67615 "2021-09-03T17:52:46Z")

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All I want to achieve is something like this: the second plot should be drawn with x-y axes exchanged y axis of the two plots should be overlayed Can anyone help me about this? Thanks in advance.

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## [Makie: mouse position in data coordinates](https://discourse.julialang.org/t/makie-mouse-position-in-data-coordinates/67573)

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**Author:** [@inverseproblem](https://discourse.julialang.org/u/inverseproblem)\
**Replies:** 4\
**Last updated:** [September 3, 2021, 5:43pm UTC](https://discourse.julialang.org/t/makie-mouse-position-in-data-coordinates/67573 "2021-09-03T17:43:51Z")

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Hello, I’m having troubles in getting the mouse position in data coordinates from a Makie plot. Using mouseposition() seems to return the position in pixel coordinates contrary to what described in the documentation ht…

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## [How to adjust the density of streamplot in Julia?](https://discourse.julialang.org/t/how-to-adjust-the-density-of-streamplot-in-julia/67647)

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**Author:** [@GoH](https://discourse.julialang.org/u/GoH)\
**Replies:** 1\
**Last updated:** [September 3, 2021, 3:08pm UTC](https://discourse.julialang.org/t/how-to-adjust-the-density-of-streamplot-in-julia/67647 "2021-09-03T15:08:40Z")

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Hi, I am trying to generate the phase space of the SI model, based on the example code in https://lazarusa.github.io/BeautifulMakie/FlowFields/streamplots3/ my code (in Pluto notebook) is begin using CairoMakie let …

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## [Graph ismorphism library?](https://discourse.julialang.org/t/graph-ismorphism-library/58555)

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**Author:** [@greatpet](https://discourse.julialang.org/u/greatpet)\
**Replies:** 4\
**Last updated:** [September 3, 2021, 1:43pm UTC](https://discourse.julialang.org/t/graph-ismorphism-library/58555 "2021-09-03T13:43:43Z")

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Are there good graph isomorphism libraries written in or accessible from Julia? Lightgrpahs.jl doesn’t seem to have this functionality. A bonus would be support for vertex / edge colors and multigrpahs.

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## [Use ForwardDiff instead of Zygote with Flux?](https://discourse.julialang.org/t/use-forwarddiff-instead-of-zygote-with-flux/67572)

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**Author:** [@weymouth](https://discourse.julialang.org/u/weymouth)\
**Replies:** 10\
**Last updated:** [September 3, 2021, 12:35pm UTC](https://discourse.julialang.org/t/use-forwarddiff-instead-of-zygote-with-flux/67572 "2021-09-03T12:35:36Z")

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I’m embedding a Flux model into a physical simulation but Zygote doesn’t seem to be able to handle taking the gradient. I got ForwardDiff.gradient working with the code yesterday. Can I use ForwardDiff as the backend in…

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## [CUDAnative: register host memory for pinned memory access](https://discourse.julialang.org/t/cudanative-register-host-memory-for-pinned-memory-access/23046)

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**Author:** [@samo](https://discourse.julialang.org/u/samo)\
**Replies:** 26\
**Last updated:** [September 3, 2021, 8:42am UTC](https://discourse.julialang.org/t/cudanative-register-host-memory-for-pinned-memory-access/23046 "2021-09-03T08:42:25Z")

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Hi all, how do I register host memory with CUDAnative in order to enable pinned memory access directly from a GPU kernel? In other words, I wonder how in Julia one can do the equivalent of the following CUDA code: …

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## [CUDNN operators not supporting Views/SubArrays](https://discourse.julialang.org/t/cudnn-operators-not-supporting-views-subarrays/67463)

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**Author:** [@jeremiedb](https://discourse.julialang.org/u/jeremiedb)\
**Replies:** 3\
**Last updated:** [September 3, 2021, 8:05am UTC](https://discourse.julialang.org/t/cudnn-operators-not-supporting-views-subarrays/67463 "2021-09-03T08:05:58Z")

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Is there a reason for Convolution (and other CUDNN related functions) to be restricted to DenseCuArray as found in the NNlibCUDA.jl repo? For example, taking a view here will result in an error as CUDA has to resort to …

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## [Differential Equation solve problem](https://discourse.julialang.org/t/differential-equation-solve-problem/67587)

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**Author:** [@hzgzh](https://discourse.julialang.org/u/hzgzh)\
**Replies:** 2\
**Last updated:** [September 3, 2021, 3:26am UTC](https://discourse.julialang.org/t/differential-equation-solve-problem/67587 "2021-09-03T03:26:15Z")

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I have a dae problem to solve ,but always have singualar error, could someone help? using DifferentialEquations, Plots function ga!(du,u,p,t) t2=0.02; τ, kp, ki, tc=p du\[1\] = ki \* (u\[5\] - u\[2\]) …

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## [Error in CUDA.jl](https://discourse.julialang.org/t/error-in-cuda-jl/65197)

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**Author:** [@jmmmachado](https://discourse.julialang.org/u/jmmmachado)\
**Replies:** 4\
**Last updated:** [September 2, 2021, 10:34pm UTC](https://discourse.julialang.org/t/error-in-cuda-jl/65197 "2021-09-02T22:34:20Z")

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Hello everyone! I am having some issues with CUDA.jl. At first I thought it was an issue with the drivers from NVIDIA or the CUDA installation on my PC, so I uninstalled the drivers, the cuda toolkits, everything. Howev…

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## [Failing test CUDA (obviously LLVM issue)](https://discourse.julialang.org/t/failing-test-cuda-obviously-llvm-issue/67555)

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**Author:** [@Dieter](https://discourse.julialang.org/u/Dieter)\
**Replies:** 1\
**Last updated:** [September 2, 2021, 10:33pm UTC](https://discourse.julialang.org/t/failing-test-cuda-obviously-llvm-issue/67555 "2021-09-02T22:33:18Z")

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Hello Community, I tried to test CUDA, unfortunately the test failed. Error Message: test CUDA Testing CUDA Status \`/tmp/jl\_rSX9Mb/Project.toml\` \[79e6a3ab\] Adapt v3.3.1 \[ab4f0b2a\] BFloat16s v0.1.0 \[052…

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## [Cbc JuMP set constraints](https://discourse.julialang.org/t/cbc-jump-set-constraints/67570)

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**Author:** [@giulia](https://discourse.julialang.org/u/giulia)\
**Replies:** 3\
**Last updated:** [September 2, 2021, 10:03pm UTC](https://discourse.julialang.org/t/cbc-jump-set-constraints/67570 "2021-09-02T22:03:59Z")

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Hello, I am trying to create a simple optimization model using JuMP and Cbc. My code is following: using JuMP, Cbc m = Model(Cbc.Optimizer) @variable(m, x1) @variable(m, x2) @constraint(m, constraint1, x1 \* x2 == 1…

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## [Compute conflict indexed output for gurobi](https://discourse.julialang.org/t/compute-conflict-indexed-output-for-gurobi/67585)

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**Author:** [@manoj.centura](https://discourse.julialang.org/u/manoj.centura)\
**Replies:** 1\
**Last updated:** [September 2, 2021, 9:55pm UTC](https://discourse.julialang.org/t/compute-conflict-indexed-output-for-gurobi/67585 "2021-09-02T21:55:13Z")

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Hi All, i am using compute conflict with gurobi the sample code and output is given as @constraint(model,conexisting20\[p in 1:P, b in 1:B\],sum(ME\_B\_O\_20\[b,c,p\]\*C\_s20\[c\] for c in 1:C)==Moves20\[p,b\] ) println("=======…

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## [Hypatia sum of squares cone](https://discourse.julialang.org/t/hypatia-sum-of-squares-cone/67523)

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**Author:** [@geo](https://discourse.julialang.org/u/geo)\
**Replies:** 3\
**Last updated:** [September 2, 2021, 6:16pm UTC](https://discourse.julialang.org/t/hypatia-sum-of-squares-cone/67523 "2021-09-02T18:16:36Z")

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I want to optimize over sum of squares, but with constraints on the coefficients of the polynomials. I know that this can be done by adding constraints; however, this often seems wasteful. For example I want to restrict …

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## [Extend density plot line (along 0)](https://discourse.julialang.org/t/extend-density-plot-line-along-0/67561)

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**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 4\
**Last updated:** [September 2, 2021, 6:01pm UTC](https://discourse.julialang.org/t/extend-density-plot-line-along-0/67561 "2021-09-02T18:01:46Z")

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If I write using StatsPlots density(sqrt.(rand(10000))) density!(sqrt.(2\*rand(10000))) then I get: The plot would be nicer if the blue line extended all the way to the maximum/minimum x values (along 0). Is there an…

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## [How to plot a matrix as an image (greyscale)](https://discourse.julialang.org/t/how-to-plot-a-matrix-as-an-image-greyscale/34147)

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**Author:** [@Ujku\_KU](https://discourse.julialang.org/u/Ujku_KU)\
**Replies:** 4\
**Last updated:** [September 2, 2021, 12:21pm UTC](https://discourse.julialang.org/t/how-to-plot-a-matrix-as-an-image-greyscale/34147 "2021-09-02T12:21:05Z")

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Hi guys, my question is how to plot a matrix as an image in greyscale? I saw the version with ‘Gadfly’ and worked for me but it was in bluescale. Thank you very much in advance for your support. Cheers. Ergnoor

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## [Moving to GeometryBasics](https://discourse.julialang.org/t/moving-to-geometrybasics/40861)

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**Author:** [@arsh](https://discourse.julialang.org/u/arsh)\
**Replies:** 9\
**Last updated:** [September 2, 2021, 10:42am UTC](https://discourse.julialang.org/t/moving-to-geometrybasics/40861 "2021-09-02T10:42:12Z")

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Hi all! I am Arsh Sharma, an electronics undergraduate and I am working on the geospatial ecosystem, in this year’s JSoC under the mentorship of Martijn Visser @visr, Bogumił Kamiński @bkamins and Maarten Pronk @evetion …

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## [HTTP.parse\_multipart\_form does a lot of memory allocations](https://discourse.julialang.org/t/http-parse-multipart-form-does-a-lot-of-memory-allocations/66661)

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**Author:** [@Jan\_Dolinsky](https://discourse.julialang.org/u/Jan_Dolinsky)\
**Replies:** 1\
**Last updated:** [September 2, 2021, 9:55am UTC](https://discourse.julialang.org/t/http-parse-multipart-form-does-a-lot-of-memory-allocations/66661 "2021-09-02T09:55:27Z")

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Hello, I tried a simple example of parsing a multi-part HTTP request (JSON config + some CSV data). The request is about 5MB big. Doing just const r = deserialize("httpRequestStored") # just to get the request that was…

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## [Key 1.0 not found](https://discourse.julialang.org/t/key-1-0-not-found/67400)

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**Author:** [@fksayaci](https://discourse.julialang.org/u/fksayaci)\
**Replies:** 13\
**Last updated:** [September 2, 2021, 5:03am UTC](https://discourse.julialang.org/t/key-1-0-not-found/67400 "2021-09-02T05:03:38Z")

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Hi, I have an optimization model, which I have run for a long time on my personal machine. When I run the same model on a cluster, it gives some errors. The error is as follows: ERROR: LoadError: KeyError: key 1.0 not …

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## [Resources for learning Julia coming from Python](https://discourse.julialang.org/t/resources-for-learning-julia-coming-from-python/67476)

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**Author:** [@garrek](https://discourse.julialang.org/u/garrek)\
**Replies:** 3\
**Last updated:** [September 2, 2021, 1:27am UTC](https://discourse.julialang.org/t/resources-for-learning-julia-coming-from-python/67476 "2021-09-02T01:27:26Z")

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I’m very new to Julia and I’m trying to find a go-to peak-finding implementation in one of the major Julia packages, but I can’t seem to find it. It seems there is a findlocalmaxima function in the Images package, but th…

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## [Forcing CUArray for tType and IType in ODESolution](https://discourse.julialang.org/t/forcing-cuarray-for-ttype-and-itype-in-odesolution/67531)

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**Author:** [@shivak](https://discourse.julialang.org/u/shivak)\
**Replies:** 2\
**Last updated:** [September 1, 2021, 11:35pm UTC](https://discourse.julialang.org/t/forcing-cuarray-for-ttype-and-itype-in-odesolution/67531 "2021-09-01T23:35:26Z")

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I’m trying to use OrdinaryDiffEq, Zygote, and CUDA to reverse-mode differentiate an ODE running on GPU. My code works on CPU, but hits this error on GPU: GPU compilation of kernel broadcast\_kernel(CUDA.CuKernelContext, …

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## [Intersection of \`SciMLBase.EnsembleSolution\`s](https://discourse.julialang.org/t/intersection-of-scimlbase-ensemblesolution-s/67390)

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**Author:** [@cadojo](https://discourse.julialang.org/u/cadojo)\
**Replies:** 10\
**Last updated:** [September 1, 2021, 11:08pm UTC](https://discourse.julialang.org/t/intersection-of-scimlbase-ensemblesolution-s/67390 "2021-09-01T23:08:45Z")

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I have two EnsembleSolutions which represent tubes of orbital trajectories in space (invariant manifolds). I’d like to find the intersection of these two EnsembleSolutions. This functionality comes in two levels… Given…

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## [Efficient deletion of affine constraints](https://discourse.julialang.org/t/efficient-deletion-of-affine-constraints/67529)

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**Author:** [@bsturt](https://discourse.julialang.org/u/bsturt)\
**Replies:** 3\
**Last updated:** [September 1, 2021, 8:56pm UTC](https://discourse.julialang.org/t/efficient-deletion-of-affine-constraints/67529 "2021-09-01T20:56:53Z")

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Many apologies in advance if this topic has already been answered. I am implementing an cutting plane algorithm for solving a class of large-scale LPs using JuMP and Gurobi. Because the model requires lots of RAM, I am …

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## [\[ANN\] Hypatia.jl: a new solver for generic conic optimization](https://discourse.julialang.org/t/ann-hypatia-jl-a-new-solver-for-generic-conic-optimization/47786)

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**Author:** [@chriscoey](https://discourse.julialang.org/u/chriscoey)\
**Replies:** 0\
**Last updated:** [October 5, 2020, 1:47pm UTC](https://discourse.julialang.org/t/ann-hypatia-jl-a-new-solver-for-generic-conic-optimization/47786 "2020-10-05T13:47:53Z")

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Hi friends, particularly those of you interested in conic optimization. We (myself and Lea Kapelevich, under the supervision of Juan Pablo Vielma) have just released v0.1.0 of Hypatia.jl, our pure-Julia open-source gener…

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## [Store Random Number Generator outside Rand()](https://discourse.julialang.org/t/store-random-number-generator-outside-rand/67517)

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**Author:** [@Albert\_Zevelev](https://discourse.julialang.org/u/Albert_Zevelev)\
**Replies:** 1\
**Last updated:** [September 1, 2021, 4:31pm UTC](https://discourse.julialang.org/t/store-random-number-generator-outside-rand/67517 "2021-09-01T16:31:26Z")

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How can store an rng w/ seed outside of rand()? julia\> using Random, Distributions; julia\> rand(MersenneTwister(0), Normal()) 0.6791074260357777 julia\> rand(MersenneTwister(0), Normal()) 0.6791074260357777 julia\> rs=…

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## [Solving PDE Diffusion (using ODE solvers). Total mass increases towards infinity (should stay constant)](https://discourse.julialang.org/t/solving-pde-diffusion-using-ode-solvers-total-mass-increases-towards-infinity-should-stay-constant/67492)

<div class="topic-metadata">

**Author:** [@Torkel](https://discourse.julialang.org/u/Torkel)\
**Replies:** 6\
**Last updated:** [September 1, 2021, 3:59pm UTC](https://discourse.julialang.org/t/solving-pde-diffusion-using-ode-solvers-total-mass-increases-towards-infinity-should-stay-constant/67492 "2021-09-01T15:59:45Z")

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I am trying to solve a very simple case of the chemical Fokker-Planch equations. It is basically a diffusion equation of the probability density function of the state of a chemical reaction network. The process is very s…

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## [Help design a node for a tree](https://discourse.julialang.org/t/help-design-a-node-for-a-tree/67444)

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**Author:** [@yakir12](https://discourse.julialang.org/u/yakir12)\
**Replies:** 20\
**Last updated:** [September 1, 2021, 2:37pm UTC](https://discourse.julialang.org/t/help-design-a-node-for-a-tree/67444 "2021-09-01T14:37:23Z")

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I’m tracking moving animals in a video. Each video frame has a few “things” that may qualify to be an animal (dirt, experimenter’s hand, shadows, objects, etc). I’d like to keep track of most of these things, and then on…

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## [Plot beyond gridlines](https://discourse.julialang.org/t/plot-beyond-gridlines/67438)

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**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 3\
**Last updated:** [August 31, 2021, 7:42pm UTC](https://discourse.julialang.org/t/plot-beyond-gridlines/67438 "2021-08-31T19:42:33Z")

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using WGLMakie n = 500 x = 1:n y = randn(n) fig = Figure() ax = Axis( fig\[1,1\], limits=(nothing, (-1.5, 1.5)), xgridcolor=:red, leftspinevisible=false, rightspinevisible=false, topspinevisible=…

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