# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=248

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

**Page:** 249

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## [Makie Mesh wrong labels after axis scaling](https://discourse.julialang.org/t/makie-mesh-wrong-labels-after-axis-scaling/87914)

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**Author:** [@verflieger](https://discourse.julialang.org/u/verflieger)\
**Replies:** 1\
**Last updated:** [September 29, 2022, 7:02am UTC](https://discourse.julialang.org/t/makie-mesh-wrong-labels-after-axis-scaling/87914 "2022-09-29T07:02:37Z")

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Hello, I am a little bit lost with plotting a 3D mesh with the Makie mesh function. Because in my given coordinate system, the y axis is flipped compared to the standard of mesh, I rescaled it. However, the axis labels …

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## [Geometric Integrators for SDE problems](https://discourse.julialang.org/t/geometric-integrators-for-sde-problems/87961)

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**Author:** [@simoneb](https://discourse.julialang.org/u/simoneb)\
**Replies:** 3\
**Last updated:** [September 29, 2022, 6:54am UTC](https://discourse.julialang.org/t/geometric-integrators-for-sde-problems/87961 "2022-09-29T06:54:33Z")

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Hi, I am trying to figure out how to use an SDE solver for matrix-valued Stochastic Differential Equations. It looks like the packages GeometricIntegrators.jl, and StochasticIntegrators.jl might have the functionality b…

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## [Ordering of isoutofdomain and continuous callbacks in DifferentialEquations.jl](https://discourse.julialang.org/t/ordering-of-isoutofdomain-and-continuous-callbacks-in-differentialequations-jl/87760)

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**Author:** [@kaitlyn-loftus](https://discourse.julialang.org/u/kaitlyn-loftus)\
**Replies:** 3\
**Last updated:** [September 29, 2022, 6:51am UTC](https://discourse.julialang.org/t/ordering-of-isoutofdomain-and-continuous-callbacks-in-differentialequations-jl/87760 "2022-09-29T06:51:51Z")

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I am encountering some undesired behavior with a combination of DifferentialEquations.jl’s marvelous isoutofdomain and event handling features. I seem to be having integrations fail because of the ordering of a Continuo…

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## [Efficient serialization of JuMP results](https://discourse.julialang.org/t/efficient-serialization-of-jump-results/87896)

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**Author:** [@jd-foster](https://discourse.julialang.org/u/jd-foster)\
**Replies:** 5\
**Last updated:** [September 28, 2022, 11:06pm UTC](https://discourse.julialang.org/t/efficient-serialization-of-jump-results/87896 "2022-09-28T23:06:00Z")

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What is a recommended workflow for efficiently serialising results data after solving a JuMP model? The information in the numbers are the important thing, not preserving the Julia object structure. For example, does an…

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## [Align ticks in subplots](https://discourse.julialang.org/t/align-ticks-in-subplots/87919)

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**Author:** [@pascal](https://discourse.julialang.org/u/pascal)\
**Replies:** 14\
**Last updated:** [September 28, 2022, 6:45pm UTC](https://discourse.julialang.org/t/align-ticks-in-subplots/87919 "2022-09-28T18:45:57Z")

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I have the following code: using CairoMakie d1 = rand(1:10, 50) d2 = rand(1:4, 20) d3 = rand(1:10, 10) fig=Figure() ax\_1=Axis(fig\[1, 1:2\]) ax\_2=Axis(fig\[2, 1\]) ax\_3=Axis(fig\[2, 2\]) scatter!(ax\_1, 1:50, d1) scatter!(…

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## [Constraints that do not work together](https://discourse.julialang.org/t/constraints-that-do-not-work-together/87482)

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**Author:** [@Zizilabg](https://discourse.julialang.org/u/Zizilabg)\
**Replies:** 5\
**Last updated:** [September 28, 2022, 5:26pm UTC](https://discourse.julialang.org/t/constraints-that-do-not-work-together/87482 "2022-09-28T17:26:27Z")

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Hello, I wrote a model about Julia which contains 3 constraints. If I test one constraint at a time, each one works. But if I run the whole program, I get the following error message: Has anyone had this problem bef…

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## [Why after copying a JuMP model it does not own the initial model variables?](https://discourse.julialang.org/t/why-after-copying-a-jump-model-it-does-not-own-the-initial-model-variables/87922)

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**Author:** [@Alex\_ricci](https://discourse.julialang.org/u/Alex_ricci)\
**Replies:** 3\
**Last updated:** [September 28, 2022, 6:16pm UTC](https://discourse.julialang.org/t/why-after-copying-a-jump-model-it-does-not-own-the-initial-model-variables/87922 "2022-09-28T18:16:20Z")

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I am working on a MIP problem including two variables y\[1\] and y\[2\]. y\[1\] is a binary y\[2\] is a positive real number First I relax the binary restriction by 0 \<=y\[1\] and -y\[1\] \>= -1 and solve the relaxation. c1…

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## [Axis() in combination with images()](https://discourse.julialang.org/t/axis-in-combination-with-images/87937)

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**Author:** [@pascal](https://discourse.julialang.org/u/pascal)\
**Replies:** 2\
**Last updated:** [September 28, 2022, 3:05pm UTC](https://discourse.julialang.org/t/axis-in-combination-with-images/87937 "2022-09-28T15:05:06Z")

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The following code from the docs works nicely: using CairoMakie using FileIO img = load(assetpath("cow.png")) f = Figure() image(f\[1, 1\], img) However, when I want to define an Axis and put that into image() it fails: …

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## [Best strategies to solve an ODE with piecewise functions using OrdinaryDiffEq](https://discourse.julialang.org/t/best-strategies-to-solve-an-ode-with-piecewise-functions-using-ordinarydiffeq/87750)

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**Author:** [@RayleighLord](https://discourse.julialang.org/u/RayleighLord)\
**Replies:** 4\
**Last updated:** [September 28, 2022, 2:59pm UTC](https://discourse.julialang.org/t/best-strategies-to-solve-an-ode-with-piecewise-functions-using-ordinarydiffeq/87750 "2022-09-28T14:59:26Z")

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I want to solve an ODE problem involving some piecewise functions and I would like to ask for advice on what could be the best strategy to solve them. Physically, the ODEs I want to solve represent a contact element sti…

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## [Heterogenous running time Ipopt](https://discourse.julialang.org/t/heterogenous-running-time-ipopt/87813)

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**Author:** [@mb96](https://discourse.julialang.org/u/mb96)\
**Replies:** 5\
**Last updated:** [September 28, 2022, 12:24pm UTC](https://discourse.julialang.org/t/heterogenous-running-time-ipopt/87813 "2022-09-28T12:24:33Z")

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I know that the first time running JuMP takes more time due to compilation issues but I was expecting roughly the same running time after that, however as it can be seen below the “variance” is quite high. Does someo…

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## [Distributed eigensolvers for computing eigenpairs of large sparse matrices](https://discourse.julialang.org/t/distributed-eigensolvers-for-computing-eigenpairs-of-large-sparse-matrices/78648)

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**Author:** [@Neo](https://discourse.julialang.org/u/Neo)\
**Replies:** 6\
**Last updated:** [September 28, 2022, 11:36am UTC](https://discourse.julialang.org/t/distributed-eigensolvers-for-computing-eigenpairs-of-large-sparse-matrices/78648 "2022-09-28T11:36:55Z")

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Hi folks, I implemented a distributed method in Julia for computing smallest eigenvalues and the corresponding eigenvectors of large sparse (symmetric) matrices. I wanted to compare my implementation with a baseline eig…

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## [Problem with first example with Flux](https://discourse.julialang.org/t/problem-with-first-example-with-flux/87899)

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**Author:** [@Richard\_Wright](https://discourse.julialang.org/u/Richard_Wright)\
**Replies:** 1\
**Last updated:** [September 28, 2022, 7:13am UTC](https://discourse.julialang.org/t/problem-with-first-example-with-flux/87899 "2022-09-28T07:13:44Z")

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Hello, I am trying the very first example in flux from Overview · Flux. The code is given below. It works fine when hcat(0:5...) but doesn’t when hcat(0:6...). Why? using Flux using Flux: train! import Random Rando…

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## [Result index of attribute](https://discourse.julialang.org/t/result-index-of-attribute/87891)

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**Author:** [@Zizilabg](https://discourse.julialang.org/u/Zizilabg)\
**Replies:** 1\
**Last updated:** [September 27, 2022, 11:41pm UTC](https://discourse.julialang.org/t/result-index-of-attribute/87891 "2022-09-27T23:41:01Z")

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Hello, I wrote a model about Julia which contains 3 constraints. If I test one constraint at a time, each one works. But if I run the whole program, I get the following error message: Has anyone had this problem bef…

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## [Create static vector of variable lenght in gpu kernel](https://discourse.julialang.org/t/create-static-vector-of-variable-lenght-in-gpu-kernel/87863)

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**Author:** [@ykkan](https://discourse.julialang.org/u/ykkan)\
**Replies:** 2\
**Last updated:** [September 27, 2022, 8:59pm UTC](https://discourse.julialang.org/t/create-static-vector-of-variable-lenght-in-gpu-kernel/87863 "2022-09-27T20:59:10Z")

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Are there any ways to create a static vector of variable length for each thread in a gpu kernel? I tried this but it didn’t work. function dosomething(n) vec = @MVector zeros(n) end @cuda threads=5 dosomething(n) …

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## [Makie - improving performance with animations?](https://discourse.julialang.org/t/makie-improving-performance-with-animations/87478)

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**Author:** [@rkube](https://discourse.julialang.org/u/rkube)\
**Replies:** 4\
**Last updated:** [September 27, 2022, 7:21pm UTC](https://discourse.julialang.org/t/makie-improving-performance-with-animations/87478 "2022-09-27T19:21:19Z")

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Hi, I’m looking into animating results from a kinetic simulation using makie and got some basic animations going. Now I’m trying to improve about performance. This script kinetic\_anim.jl · GitHub animates the trajecto…

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## [How to use/initialize Zygote.Buffer](https://discourse.julialang.org/t/how-to-use-initialize-zygote-buffer/87653)

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**Author:** [@LeN3rd](https://discourse.julialang.org/u/LeN3rd)\
**Replies:** 3\
**Last updated:** [September 27, 2022, 2:52pm UTC](https://discourse.julialang.org/t/how-to-use-initialize-zygote-buffer/87653 "2022-09-27T14:52:10Z")

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This is probably a common question, but when i use Zygote.Buffer i cannot assign values by doing buffer .= old\_data It throws the following: ERROR: MethodError: no method matching ndims(::Type{Zygote.Buffer{Float64, Ma…

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## [2D FFT convolution but get inaccurate results](https://discourse.julialang.org/t/2d-fft-convolution-but-get-inaccurate-results/87816)

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**Author:** [@maphdze](https://discourse.julialang.org/u/maphdze)\
**Replies:** 9\
**Last updated:** [September 27, 2022, 12:38pm UTC](https://discourse.julialang.org/t/2d-fft-convolution-but-get-inaccurate-results/87816 "2022-09-27T12:38:07Z")

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I am trying to calculate this convlution integral a(x)=\\int{\\varphi(x,x\\prime)}w(x\\prime)\\rm{d}\\it{V\\prime},where \\varphi(x,x\\prime) is a compact support kernel function with a radius \\ell. Currently, \\varphi(x,x\\prime) …

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## [Edgelist representation as array](https://discourse.julialang.org/t/edgelist-representation-as-array/49960)

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**Author:** [@SDA](https://discourse.julialang.org/u/SDA)\
**Replies:** 1\
**Last updated:** [September 27, 2022, 11:39am UTC](https://discourse.julialang.org/t/edgelist-representation-as-array/49960 "2022-09-27T11:39:15Z")

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I am wanting to get an edgelist from my graph that can then be used as a coordinate in 2D. using LightGraphs A = \[ 0 1 1 1 0 1 1 1 0 \] G = Graph(A) EL = collect(edges(G)) How can the edge list EL be converted to an ar…

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## [Calling Flux.gpu downloads CUDNN artifact every first call in REPL/script](https://discourse.julialang.org/t/calling-flux-gpu-downloads-cudnn-artifact-every-first-call-in-repl-script/87784)

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**Author:** [@linkz](https://discourse.julialang.org/u/linkz)\
**Replies:** 6\
**Last updated:** [September 27, 2022, 8:58am UTC](https://discourse.julialang.org/t/calling-flux-gpu-downloads-cudnn-artifact-every-first-call-in-repl-script/87784 "2022-09-27T08:58:40Z")

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Pretty much as the title says. Whenever I call e.g. Import Flux d\_gpu = Flux.gpu(Flux.Dense(10, 10)) ┌ Warning: The NVIDIA driver on this system only supports up to CUDA 11.0.0. │ For performance reasons, it is recommen…

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## [Convex Neural Network Using Skip Layers in Flux.jl](https://discourse.julialang.org/t/convex-neural-network-using-skip-layers-in-flux-jl/87827)

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**Author:** [@marcofrancis](https://discourse.julialang.org/u/marcofrancis)\
**Replies:** 5\
**Last updated:** [September 27, 2022, 8:30am UTC](https://discourse.julialang.org/t/convex-neural-network-using-skip-layers-in-flux-jl/87827 "2022-09-27T08:30:00Z")

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Hi, I’m trying to code up the following net, where y is the input of my net, f(y) is the output of the net, W^z\_k, W^y\_k are matrices and b\_k are vectors : f(y) = z\_k z\_k = softplus(W^z\_k z\_{k-1}+W^y\_k y+b\_k) … z…

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## [RobotOSData.jl visualization of ROS objects](https://discourse.julialang.org/t/robotosdata-jl-visualization-of-ros-objects/82804)

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**Author:** [@ga72kud](https://discourse.julialang.org/u/ga72kud)\
**Replies:** 1\
**Last updated:** [September 27, 2022, 6:04am UTC](https://discourse.julialang.org/t/robotosdata-jl-visualization-of-ros-objects/82804 "2022-09-27T06:04:26Z")

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Hi I use RobotOs.jl and RobotOSData.jl for reading and analyzing ROS data (rosbags). Are there any further tools to visualize ROS Markers. Best and thanks!

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## [MultivariateStats.jl: predict for MulticlassLDA is throwing error](https://discourse.julialang.org/t/multivariatestats-jl-predict-for-multiclasslda-is-throwing-error/87799)

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**Author:** [@Sourish](https://discourse.julialang.org/u/Sourish)\
**Replies:** 2\
**Last updated:** [September 27, 2022, 2:56am UTC](https://discourse.julialang.org/t/multivariatestats-jl-predict-for-multiclasslda-is-throwing-error/87799 "2022-09-27T02:56:16Z")

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Hi I am trying to fit MulticlassLDA on the iris dataset. The predict is throwing an error. I was wondering if you can help me to figure out what mistakes I am making. using MultivariateStats, RDatasets; iris = dataset…

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## [What is a Model fingerprint?](https://discourse.julialang.org/t/what-is-a-model-fingerprint/87851)

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**Author:** [@WuSiren](https://discourse.julialang.org/u/WuSiren)\
**Replies:** 1\
**Last updated:** [September 27, 2022, 2:50am UTC](https://discourse.julialang.org/t/what-is-a-model-fingerprint/87851 "2022-09-27T02:50:21Z")

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What is a Model fingerprint? What is it used for? Does the same model have the same Model fingerprint in different machines?

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## [Wandb.jl hangs on first input prompt](https://discourse.julialang.org/t/wandb-jl-hangs-on-first-input-prompt/87838)

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**Author:** [@afishy](https://discourse.julialang.org/u/afishy)\
**Replies:** 1\
**Last updated:** [September 27, 2022, 12:03am UTC](https://discourse.julialang.org/t/wandb-jl-hangs-on-first-input-prompt/87838 "2022-09-27T00:03:48Z")

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I’m trying to use Weights and Biases with Julia, and the REPL hangs when I try and use it (on VSCode): using Wandb lg = WandbLogger(project=“wandb\_test”) global\_logger(lg) Any input I enter is stuck (numlock is o…

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## [Reinforcement Learning Custom Gym error](https://discourse.julialang.org/t/reinforcement-learning-custom-gym-error/87818)

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**Author:** [@chunky](https://discourse.julialang.org/u/chunky)\
**Replies:** 2\
**Last updated:** [September 26, 2022, 10:35pm UTC](https://discourse.julialang.org/t/reinforcement-learning-custom-gym-error/87818 "2022-09-26T22:35:47Z")

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I’ve created a custom Gym environment using ReinforcementLearning.jl. I think it adheres to the guidance on the documentation \[ “How to write a customised environment” \] , but the trivial case to run my gym, using a rand…

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## [Methods for simultaneous diagonalization?](https://discourse.julialang.org/t/methods-for-simultaneous-diagonalization/87840)

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**Author:** [@kharing](https://discourse.julialang.org/u/kharing)\
**Replies:** 1\
**Last updated:** [September 26, 2022, 9:19pm UTC](https://discourse.julialang.org/t/methods-for-simultaneous-diagonalization/87840 "2022-09-26T21:19:02Z")

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I have two matrices that commute (within machine precision), both of which have eigenvalues that may be either degenerate or very closely spaced. Is there an existing implementation of a simultaneous diagonalization rout…

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## [DimensionalData: how to map slices, while using non-slice dimensions](https://discourse.julialang.org/t/dimensionaldata-how-to-map-slices-while-using-non-slice-dimensions/87839)

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**Author:** [@ElOceanografo](https://discourse.julialang.org/u/ElOceanografo)\
**Replies:** 1\
**Last updated:** [September 26, 2022, 8:59pm UTC](https://discourse.julialang.org/t/dimensionaldata-how-to-map-slices-while-using-non-slice-dimensions/87839 "2022-09-26T20:59:45Z")

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I’ve got a multidimensional DimArray and want to map a function that summarizes across one of the dimensions. This is simple to do using mapslices, e.g. using DimensionalData arr = rand(X(1:10), Y(1:20), Z(1:30)) f(z) =…

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## [Demo: Example of CUDA/OpenGL interop in Julia](https://discourse.julialang.org/t/demo-example-of-cuda-opengl-interop-in-julia/87830)

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**Author:** [@erikedin](https://discourse.julialang.org/u/erikedin)\
**Replies:** 0\
**Last updated:** [September 26, 2022, 6:30pm UTC](https://discourse.julialang.org/t/demo-example-of-cuda-opengl-interop-in-julia/87830 "2022-09-26T18:30:44Z")

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Hello! I’m working to learn a bit about graphics and CUDA programming in Julia. I made an effort to use GLFW and OpenGL to open create a window, and render graphics to that window from a CUDA kernel. I’ve seen that othe…

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## [How can I tell Julia what are the parameters in a linear model?](https://discourse.julialang.org/t/how-can-i-tell-julia-what-are-the-parameters-in-a-linear-model/87692)

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**Author:** [@bertulli](https://discourse.julialang.org/u/bertulli)\
**Replies:** 14\
**Last updated:** [September 26, 2022, 5:24pm UTC](https://discourse.julialang.org/t/how-can-i-tell-julia-what-are-the-parameters-in-a-linear-model/87692 "2022-09-26T17:24:11Z")

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Hi all! So, I’m experimenting with the linear regression ecosystem (GLM, Plots, DataFrames, StatsPlots and CSV). I understood how to produce a simple linear regression model and a multivariate one. I know that OLS work…

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## [Kernel fails when number of blocks exceeds number of SM's (?)](https://discourse.julialang.org/t/kernel-fails-when-number-of-blocks-exceeds-number-of-sms/87800)

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**Author:** [@lodygaw](https://discourse.julialang.org/u/lodygaw)\
**Replies:** 3\
**Last updated:** [September 26, 2022, 2:11pm UTC](https://discourse.julialang.org/t/kernel-fails-when-number-of-blocks-exceeds-number-of-sms/87800 "2022-09-26T14:11:40Z")

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Hi, I want to write a kernel that will filter values in input arrays of predefined length based on some condition. Also, I would like to have “good” values (which fulfill the condition) at the beginning of this arrays. …

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