# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=254

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**Page:** 255

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## [SOLVED: Cannot Precompile OrdinaryDiffEq. Do others have problems with SciML/MTK packages at the moment?](https://discourse.julialang.org/t/solved-cannot-precompile-ordinarydiffeq-do-others-have-problems-with-sciml-mtk-packages-at-the-moment/86729)

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**Author:** [@TS-CUBED](https://discourse.julialang.org/u/TS-CUBED)\
**Replies:** 0\
**Last updated:** [September 3, 2022, 1:52pm UTC](https://discourse.julialang.org/t/solved-cannot-precompile-ordinarydiffeq-do-others-have-problems-with-sciml-mtk-packages-at-the-moment/86729 "2022-09-03T13:52:46Z")

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SOLVED: not sure what the problem was. But setting the environment back up from scratch, after deleting all the precompile cache helped. I guess I had a few bad bits cached. I just did an update of my Julia packages an…

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## [NCDatasets: copy the properties of a variable](https://discourse.julialang.org/t/ncdatasets-copy-the-properties-of-a-variable/85721)

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**Author:** [@ryofurue](https://discourse.julialang.org/u/ryofurue)\
**Replies:** 11\
**Last updated:** [September 3, 2022, 2:13pm UTC](https://discourse.julialang.org/t/ncdatasets-copy-the-properties-of-a-variable/85721 "2022-09-03T14:13:13Z")

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Is there a facility to copy a netCDF variable including its axes (dimensions) and attributes at once? A scenario: ds\_org = Dataset("original.nc", "r") org = ds\["orgvar"\] Dataset("new.nc", "c") do ds\_new defVar(ds\_new…

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## [How do I save a plot?](https://discourse.julialang.org/t/how-do-i-save-a-plot/35370)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 7\
**Last updated:** [September 3, 2022, 1:41pm UTC](https://discourse.julialang.org/t/how-do-i-save-a-plot/35370 "2022-09-03T13:41:29Z")

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julia\> out = DataFrame(Q1 = \[3,3,3\], Q2 = \[3,2,1\]) 3×2 DataFrame │ Row │ Q1 │ Q2 │ │ │ Int64 │ Int64 │ ├─────┼───────┼───────┤ │ 1 │ 3 │ 3 │ │ 2 │ 3 │ 2 │ │ 3 │ 3 │ 1 │ julia\> fig…

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## [Performance with intermittent singleton dimensions](https://discourse.julialang.org/t/performance-with-intermittent-singleton-dimensions/86374)

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**Author:** [@RainerHeintzmann](https://discourse.julialang.org/u/RainerHeintzmann)\
**Replies:** 11\
**Last updated:** [September 3, 2022, 12:04pm UTC](https://discourse.julialang.org/t/performance-with-intermittent-singleton-dimensions/86374 "2022-09-03T12:04:00Z")

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Hello performance aficionados. I was testing a bit the copy performance, to see if there may be caching issues with multidimensional array copies and am generally quite impressed. However, I found one case that may lead…

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## [Arithmetic with a specified (low) number of digits](https://discourse.julialang.org/t/arithmetic-with-a-specified-low-number-of-digits/86713)

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**Author:** [@DanielVandH](https://discourse.julialang.org/u/DanielVandH)\
**Replies:** 1\
**Last updated:** [September 3, 2022, 1:12am UTC](https://discourse.julialang.org/t/arithmetic-with-a-specified-low-number-of-digits/86713 "2022-09-03T01:12:22Z")

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Is it possible to perform computations using, say, five-digit arithmetic with a given rounding mode? For example, can I easily compute x/10^{-5}, x = 0.44446, in 5-digit arithmetic with rounding to the nearest number? I …

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## [Can MTK validate dimensions when using "connect" function?](https://discourse.julialang.org/t/can-mtk-validate-dimensions-when-using-connect-function/86699)

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**Author:** [@TS-CUBED](https://discourse.julialang.org/u/TS-CUBED)\
**Replies:** 2\
**Last updated:** [September 2, 2022, 10:49pm UTC](https://discourse.julialang.org/t/can-mtk-validate-dimensions-when-using-connect-function/86699 "2022-09-02T22:49:02Z")

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I’m trying to set up a circulation model with units. Or at least allow consistency checks. So I was playing around with Model Validation and Units · ModelingToolkit.jl and set up the following: using ModelingToolkit, Un…

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## [How do I insert a specific string into a BioSequences DNA string?](https://discourse.julialang.org/t/how-do-i-insert-a-specific-string-into-a-biosequences-dna-string/86694)

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**Author:** [@zhangchunyong](https://discourse.julialang.org/u/zhangchunyong)\
**Replies:** 1\
**Last updated:** [September 2, 2022, 4:40pm UTC](https://discourse.julialang.org/t/how-do-i-insert-a-specific-string-into-a-biosequences-dna-string/86694 "2022-09-02T16:40:51Z")

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using BioSequences julia\> a=dna"ATCG" 4nt DNA Sequence: ATCG julia\> insert!(a,2,'C') 5nt DNA Sequence: ACTCG But if I inserted more than one chars,it will fail. julia\> insert!(a,2,"CG") ERROR: MethodError: Cannot \`conv…

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## [Change SCS solver options](https://discourse.julialang.org/t/change-scs-solver-options/86676)

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**Author:** [@mosby](https://discourse.julialang.org/u/mosby)\
**Replies:** 2\
**Last updated:** [September 2, 2022, 2:56pm UTC](https://discourse.julialang.org/t/change-scs-solver-options/86676 "2022-09-02T14:56:34Z")

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Hi, I am new to Julia, while I am trying to use SCS.Optimizer to get the solution of projection problem, I see SCS has default eps = 1e-4, what if I want to be more accurate, like 1e-6, how could I change it? I found s…

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## [Survival analysis in Turing: vectorized version leads to strange errors](https://discourse.julialang.org/t/survival-analysis-in-turing-vectorized-version-leads-to-strange-errors/86301)

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**Author:** [@vfonov](https://discourse.julialang.org/u/vfonov)\
**Replies:** 5\
**Last updated:** [September 2, 2022, 1:03pm UTC](https://discourse.julialang.org/t/survival-analysis-in-turing-vectorized-version-leads-to-strange-errors/86301 "2022-09-02T13:03:31Z")

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I have an example for a simple survival analysis in Turing that works fine when using loop but produces strange errors when I attempt to convert it to vectorized form: # Import Turing and Distributions. using Turing, Di…

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## [DimensionMismatch for a Raster](https://discourse.julialang.org/t/dimensionmismatch-for-a-raster/86677)

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**Author:** [@ryofurue](https://discourse.julialang.org/u/ryofurue)\
**Replies:** 1\
**Last updated:** [September 2, 2022, 9:33am UTC](https://discourse.julialang.org/t/dimensionmismatch-for-a-raster/86677 "2022-09-02T09:33:45Z")

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A Raster behaves just like an Array in suitable contexts, but I found the following difference in broadcast behavior. Is it 1) an intended behavior, 2) an unavoidable inconsistency, or 3) a bug? Basically, avr = sum(v…

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## [Range step cannot be zero](https://discourse.julialang.org/t/range-step-cannot-be-zero/66948)

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**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 10\
**Last updated:** [September 2, 2022, 8:18am UTC](https://discourse.julialang.org/t/range-step-cannot-be-zero/66948 "2022-09-02T08:18:37Z")

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I don’t know how to make a minimal reproducer of this but I can’t make it work either. Here’s the error I can share. Any ideas would be helpful. I’m trying to make a Band plot but all the high values are equal and all th…

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## [TLS Support Questions](https://discourse.julialang.org/t/tls-support-questions/84004)

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**Author:** [@quinnj](https://discourse.julialang.org/u/quinnj)\
**Replies:** 5\
**Last updated:** [September 2, 2022, 6:24am UTC](https://discourse.julialang.org/t/tls-support-questions/84004 "2022-09-02T06:24:20Z")

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Currently HTTP.jl hard-codes a dependency on MbedTLS.jl for TLS support; it has served us decently over the years, but there have always been a lingering set of errors that crop up that are very difficult to debug; eithe…

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## [Save a figure with a specific size with a subplot of a specific size in Plots.jl (with PGFPlotsX backend)](https://discourse.julialang.org/t/save-a-figure-with-a-specific-size-with-a-subplot-of-a-specific-size-in-plots-jl-with-pgfplotsx-backend/86614)

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**Author:** [@JonasWickman](https://discourse.julialang.org/u/JonasWickman)\
**Replies:** 2\
**Last updated:** [September 1, 2022, 3:02pm UTC](https://discourse.julialang.org/t/save-a-figure-with-a-specific-size-with-a-subplot-of-a-specific-size-in-plots-jl-with-pgfplotsx-backend/86614 "2022-09-01T15:02:54Z")

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In PyPlot, I can output a figure with a specific size containing an axis in the figure with a specific size using the code: using PyPlot fig\_width = 4.0 fig\_height = 3.0 fig = figure( figsize = (fig\_width, fig\_height) )…

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## [Issues with PSO within Optim.jl](https://discourse.julialang.org/t/issues-with-pso-within-optim-jl/86638)

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**Author:** [@NTmuir](https://discourse.julialang.org/u/NTmuir)\
**Replies:** 0\
**Last updated:** [September 1, 2022, 11:56am UTC](https://discourse.julialang.org/t/issues-with-pso-within-optim-jl/86638 "2022-09-01T11:56:17Z")

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Hi there, I am fairly new to Julia and I am struggling to get a PSO to work within Optim.jl, I am using PETLION which is physical based battery simulation tool to get voltage data while changing a single physical parame…

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## [Good solver for nonlinear diffusion PDE with source?](https://discourse.julialang.org/t/good-solver-for-nonlinear-diffusion-pde-with-source/86587)

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**Author:** [@JordiBolibar](https://discourse.julialang.org/u/JordiBolibar)\
**Replies:** 1\
**Last updated:** [August 31, 2022, 1:45pm UTC](https://discourse.julialang.org/t/good-solver-for-nonlinear-diffusion-pde-with-source/86587 "2022-08-31T13:45:37Z")

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With @facusapienza we’re trying to find a good solver to solve a 2D nonlinear ice flow PDE with mass addition and subtraction (i.e. heat equation with source). We are encountering a big difference in solving it with and …

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## [How to select a subgraph in Graph.jl Package](https://discourse.julialang.org/t/how-to-select-a-subgraph-in-graph-jl-package/86631)

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**Author:** [@A\_Green\_Leave](https://discourse.julialang.org/u/A_Green_Leave)\
**Replies:** 1\
**Last updated:** [September 1, 2022, 8:50am UTC](https://discourse.julialang.org/t/how-to-select-a-subgraph-in-graph-jl-package/86631 "2022-09-01T08:50:29Z")

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Hi, I’m working with Graph and SimpleWeightedGraphs Packages and was wondering if they allow to extract/select a subgraph and work with it too? I mean having a subgraph knowing its edges and nodes. I’d like to work w…

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## [Determinant of a symbolic matrix](https://discourse.julialang.org/t/determinant-of-a-symbolic-matrix/85587)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 4\
**Last updated:** [September 1, 2022, 12:33am UTC](https://discourse.julialang.org/t/determinant-of-a-symbolic-matrix/85587 "2022-09-01T00:33:39Z")

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With Symbolics.jl how do I get the determinant of a symbolic matrix? I tried this: @variables a\[1:2, 1:2\] det(a) The only thing I can get is: Symbolics.\_det(a, true)

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## [Neither Parquet.jl nor Parquet2.jl can read my .parquet file](https://discourse.julialang.org/t/neither-parquet-jl-nor-parquet2-jl-can-read-my-parquet-file/86610)

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**Author:** [@adienes](https://discourse.julialang.org/u/adienes)\
**Replies:** 7\
**Last updated:** [August 31, 2022, 10:45pm UTC](https://discourse.julialang.org/t/neither-parquet-jl-nor-parquet2-jl-can-read-my-parquet-file/86610 "2022-08-31T22:45:29Z")

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I am trying to load a parquet file (about 1Gb) on Julia 1.8, and neither Parquet.read\_parquet nor Parquet2.readfile are able to open it. The former just hangs forever until I kill it, and the latter gives me a very long …

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## [Best library for visualizing time series](https://discourse.julialang.org/t/best-library-for-visualizing-time-series/86602)

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**Author:** [@mariuszoican](https://discourse.julialang.org/u/mariuszoican)\
**Replies:** 12\
**Last updated:** [August 31, 2022, 5:45pm UTC](https://discourse.julialang.org/t/best-library-for-visualizing-time-series/86602 "2022-08-31T17:45:45Z")

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Hello, I was wondering what is the best library for visualizing time series? I’m coming from Python, where I’m using matplotlib and seaborn. Tried Gadfly, but it’s not very prone customization – I couldn’t figure out ho…

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## [NeuralPDE cubature issue](https://discourse.julialang.org/t/neuralpde-cubature-issue/84427)

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**Author:** [@marcofrancis](https://discourse.julialang.org/u/marcofrancis)\
**Replies:** 5\
**Last updated:** [August 31, 2022, 3:34pm UTC](https://discourse.julialang.org/t/neuralpde-cubature-issue/84427 "2022-08-31T15:34:07Z")

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Hi, I’m moving my first steps with NeuralPDE.jl and I came up with this issue. I want to solve a fairly simple PDE: h(ω) = exp.(-(γ-1)\*ω) μω = λ\*(ω-ωb) σω = σ eq = 1/100\*Dτ(f(τ,ω)) ~ 0.5\*σω^2\*Dωω(f(τ,ω)) - μω\*Dω(f(τ,ω…

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## [Updated Makie 0.17.13 Can't turn off the decorations](https://discourse.julialang.org/t/updated-makie-0-17-13-cant-turn-off-the-decorations/86232)

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**Author:** [@Allan\_Baker](https://discourse.julialang.org/u/Allan_Baker)\
**Replies:** 4\
**Last updated:** [August 31, 2022, 2:07pm UTC](https://discourse.julialang.org/t/updated-makie-0-17-13-cant-turn-off-the-decorations/86232 "2022-08-31T14:07:24Z")

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I have some old Makie GUI code I wrote a year or more ago. It used LScene and all that before the figure stuff was around. Now after the update, I have my decorations and splines showing up in my 3D plots, but since I …

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## [How to save nonlinear JuMP model to file?](https://discourse.julialang.org/t/how-to-save-nonlinear-jump-model-to-file/86322)

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**Author:** [@a6a3uh](https://discourse.julialang.org/u/a6a3uh)\
**Replies:** 21\
**Last updated:** [August 31, 2022, 11:13am UTC](https://discourse.julialang.org/t/how-to-save-nonlinear-jump-model-to-file/86322 "2022-08-31T11:13:37Z")

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Is it unsupported feature yet? Ivoking write\_to\_file I get: ERROR: MathOptInterface.UnsupportedAttribute{MathOptInterface.NLPBlock}: Attribute MathOptInterface.NLPBlock() is not supported by the model. Could someone p…

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## [Error : no method matching getindex](https://discourse.julialang.org/t/error-no-method-matching-getindex/86537)

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**Author:** [@Eric.O](https://discourse.julialang.org/u/Eric.O)\
**Replies:** 4\
**Last updated:** [August 31, 2022, 10:33am UTC](https://discourse.julialang.org/t/error-no-method-matching-getindex/86537 "2022-08-31T10:33:44Z")

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I have my code displaying the objective function with the constraints but the final answer is not reflecting. I always get the error " No method matching getindex". I look through the work severally but am not able to r…

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## [Julia and the Game of Go](https://discourse.julialang.org/t/julia-and-the-game-of-go/86454)

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**Author:** [@Ordens\_Ritter](https://discourse.julialang.org/u/Ordens_Ritter)\
**Replies:** 6\
**Last updated:** [August 31, 2022, 7:16am UTC](https://discourse.julialang.org/t/julia-and-the-game-of-go/86454 "2022-08-31T07:16:27Z")

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Once I a while a start a new hobby project in Julia in the vacations. To learn Julia and have so fun and than always forget the most afterwards because I use Python in my day job. :frowning: (I don’t like the forgetting …

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## [StatPlots groupedbar order x axis](https://discourse.julialang.org/t/statplots-groupedbar-order-x-axis/13912)

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**Author:** [@stelmo](https://discourse.julialang.org/u/stelmo)\
**Replies:** 18\
**Last updated:** [August 30, 2022, 10:00pm UTC](https://discourse.julialang.org/t/statplots-groupedbar-order-x-axis/13912 "2022-08-30T22:00:05Z")

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Hi, Is there a way to order the x-axis bars using groupedbar? Currently it is placing the individual bars alphabetically, but I would like to specify the order manually. I have tried using plot!(xticks=(1:10, labels)), …

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## [Usage of CUDA.CUFFT.cufftPlanMany](https://discourse.julialang.org/t/usage-of-cuda-cufft-cufftplanmany/86403)

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**Author:** [@gerhardu](https://discourse.julialang.org/u/gerhardu)\
**Replies:** 1\
**Last updated:** [August 30, 2022, 6:32pm UTC](https://discourse.julialang.org/t/usage-of-cuda-cufft-cufftplanmany/86403 "2022-08-30T18:32:41Z")

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Hi, I need to calculate approx 600 FFT’s of 3 dimensional arrays (e.g. 128^3). I know how to do this on CPUs and also how to do this sequentially on a GPU. By sequentially I mean that I copy one of the 600 arrays to t…

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## [Symbolics and polynomials](https://discourse.julialang.org/t/symbolics-and-polynomials/86541)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 0\
**Last updated:** [August 30, 2022, 11:23am UTC](https://discourse.julialang.org/t/symbolics-and-polynomials/86541 "2022-08-30T11:23:50Z")

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What is the best package for working with polynomials with Symbolics.jl?

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## [User cut with JuMP and Gurobi](https://discourse.julialang.org/t/user-cut-with-jump-and-gurobi/86518)

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**Author:** [@Luiz\_Monteiro](https://discourse.julialang.org/u/Luiz_Monteiro)\
**Replies:** 1\
**Last updated:** [August 29, 2022, 11:18pm UTC](https://discourse.julialang.org/t/user-cut-with-jump-and-gurobi/86518 "2022-08-29T23:18:57Z")

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Hi, I am trying to insert user cuts in a mixed-integer linear programming model (Location-routing problem). I’m using the sintax presented in JuMP documentation (Callbacks · JuMP), and model in direct mode (model1 = dir…

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## [Converting an image rotation demo from JuliaCon 2021 (AMD -\> NVIDIA)](https://discourse.julialang.org/t/converting-an-image-rotation-demo-from-juliacon-2021-amd-nvidia/86365)

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**Author:** [@aaron\_pung](https://discourse.julialang.org/u/aaron_pung)\
**Replies:** 3\
**Last updated:** [August 29, 2022, 7:32pm UTC](https://discourse.julialang.org/t/converting-an-image-rotation-demo-from-juliacon-2021-amd-nvidia/86365 "2022-08-29T19:32:02Z")

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I’ve been trying to convert the rotate\_kernel function from the 2021 JuliaCon GPU Workshop to work with CUDA, but I’m having trouble. I’m new to building kernels on the GPU, but my current implementation of these functi…

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## [Symbolics and Polynomial](https://discourse.julialang.org/t/symbolics-and-polynomial/86503)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 3\
**Last updated:** [August 29, 2022, 7:31pm UTC](https://discourse.julialang.org/t/symbolics-and-polynomial/86503 "2022-08-29T19:31:24Z")

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Is there a function that lets you know if a given expression is a polynomial?

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