# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=260

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**Page:** 261

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## [How can lazy constraints be written in a \*.lp file?](https://discourse.julialang.org/t/how-can-lazy-constraints-be-written-in-a-lp-file/85324)

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**Author:** [@Somayeh\_Esmaeili](https://discourse.julialang.org/u/Somayeh_Esmaeili)\
**Replies:** 9\
**Last updated:** [August 10, 2022, 2:21pm UTC](https://discourse.julialang.org/t/how-can-lazy-constraints-be-written-in-a-lp-file/85324 "2022-08-10T14:21:17Z")

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I need to convert the codes in \*.lp file. But the lazy constraints can not be converted. Would you please help me? Thanks very much using JuMP,CPLEX T=Model(solver=CplexSolver()); #Sets----------------------------------…

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## [HTTP.jl: How to post a series of json strings over a live connection](https://discourse.julialang.org/t/http-jl-how-to-post-a-series-of-json-strings-over-a-live-connection/85572)

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**Author:** [@mst](https://discourse.julialang.org/u/mst)\
**Replies:** 2\
**Last updated:** [August 10, 2022, 12:26pm UTC](https://discourse.julialang.org/t/http-jl-how-to-post-a-series-of-json-strings-over-a-live-connection/85572 "2022-08-10T12:26:04Z")

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Hello, I have a vector v where each element is a valid json string: v = \[json1, json2, ..., jsonN\] using HTTP.jl, I open a connection to a url and post each json in v: for json ∈ v HTTP.post(url, headers, json) end…

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## [Solving system of ode with Modeling Toolkit](https://discourse.julialang.org/t/solving-system-of-ode-with-modeling-toolkit/85524)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 3\
**Last updated:** [August 10, 2022, 10:08am UTC](https://discourse.julialang.org/t/solving-system-of-ode-with-modeling-toolkit/85524 "2022-08-10T10:08:45Z")

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I solved this ode system with DifferentialEquations and got the correct result. I am trying with ModelingToolkit but I don’t get the correct result. What am I doing wrong? p₀, q₀ = 0.0, 3.0 @variables t @parameters P(…

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## [Access variables in vector using Symbols](https://discourse.julialang.org/t/access-variables-in-vector-using-symbols/85432)

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**Author:** [@this\_josh](https://discourse.julialang.org/u/this_josh)\
**Replies:** 7\
**Last updated:** [August 10, 2022, 9:17am UTC](https://discourse.julialang.org/t/access-variables-in-vector-using-symbols/85432 "2022-08-10T09:17:44Z")

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I have a model with variables defined as a is below, I need to be able to access the models variables in a model agnostic way. For this I use Symbols as model\[:b\] will get me b for any model which has a variable b. How …

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## [What is the best way to separate out indices of a variable?](https://discourse.julialang.org/t/what-is-the-best-way-to-separate-out-indices-of-a-variable/85317)

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**Author:** [@A\_Green\_Leave](https://discourse.julialang.org/u/A_Green_Leave)\
**Replies:** 3\
**Last updated:** [August 10, 2022, 7:07am UTC](https://discourse.julialang.org/t/what-is-the-best-way-to-separate-out-indices-of-a-variable/85317 "2022-08-10T07:07:22Z")

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Hi guys, What do you recommend to do in this situation? I have a set M consisting of three separate sets of vectors of various size. In other words M = \[m\_1, m\_2, m\_3\] where m\_i are vectors of different sizes. For ins…

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## [Figure caption in Pluto](https://discourse.julialang.org/t/figure-caption-in-pluto/85564)

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**Author:** [@grero](https://discourse.julialang.org/u/grero)\
**Replies:** 0\
**Last updated:** [August 10, 2022, 4:42am UTC](https://discourse.julialang.org/t/figure-caption-in-pluto/85564 "2022-08-10T04:42:50Z")

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This may be obvious to Pluto users, but I was struggling for a while with creating captioned figures in Pluto notebooks. I used to have a cell with a Makie figure as output, followed by a Markdown cell containing the cap…

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## [Integrator AutoVern9(Rodas5) take a lot of time DifferentialEquations.jl](https://discourse.julialang.org/t/integrator-autovern9-rodas5-take-a-lot-of-time-differentialequations-jl/85470)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 8\
**Last updated:** [August 9, 2022, 2:34pm UTC](https://discourse.julialang.org/t/integrator-autovern9-rodas5-take-a-lot-of-time-differentialequations-jl/85470 "2022-08-09T14:34:50Z")

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I have systems: function HR!(du, u, p, t) function sigma(x) return 1.0 / ( 1.0 + exp( -10.0 \* ( x - ( - 0.25 ) ) ) ) end a, b, c, d, s, xr, r, I, vs, k1, k2, el\_link = p x1, y1, …

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## [Slow HTTP.jl requests when SSL is enabled](https://discourse.julialang.org/t/slow-http-jl-requests-when-ssl-is-enabled/36183)

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**Author:** [@karelh](https://discourse.julialang.org/u/karelh)\
**Replies:** 9\
**Last updated:** [August 9, 2022, 2:00pm UTC](https://discourse.julialang.org/t/slow-http-jl-requests-when-ssl-is-enabled/36183 "2022-08-09T14:00:12Z")

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I am using HTTP.jl library to download large files over an encrypted connection (via AWSS3 to connect to an S3-enabled datastore). I have found out that the performance is greatly degraded when encrypted connection is us…

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## [Genetic algorithms support for optimization with julia](https://discourse.julialang.org/t/genetic-algorithms-support-for-optimization-with-julia/85512)

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**Author:** [@chenr86](https://discourse.julialang.org/u/chenr86)\
**Replies:** 6\
**Last updated:** [August 9, 2022, 12:09pm UTC](https://discourse.julialang.org/t/genetic-algorithms-support-for-optimization-with-julia/85512 "2022-08-09T12:09:36Z")

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Hello, I’m dealing with multi-objective optimization problem. I wonder if there is any support of genetic algorithm with Julia. Besides, compared with other solvers, does GA perform well solving MOO? For example, it cos…

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## [Simple multi-parameter bayesian linear regression returning un-expected results!](https://discourse.julialang.org/t/simple-multi-parameter-bayesian-linear-regression-returning-un-expected-results/81285)

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**Author:** [@charperflow](https://discourse.julialang.org/u/charperflow)\
**Replies:** 14\
**Last updated:** [August 9, 2022, 11:20am UTC](https://discourse.julialang.org/t/simple-multi-parameter-bayesian-linear-regression-returning-un-expected-results/81285 "2022-08-09T11:20:05Z")

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The problem is from chapter 10 question 7 of “Regression and Other Stories”, and the general idea is to use data which includes a continuous parameter “beauty” and then several binary predictors. I have solved the probl…

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## [Help setting up CUDA.jl and cuTENSORS](https://discourse.julialang.org/t/help-setting-up-cuda-jl-and-cutensors/85505)

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**Author:** [@apateonas](https://discourse.julialang.org/u/apateonas)\
**Replies:** 1\
**Last updated:** [August 9, 2022, 8:21am UTC](https://discourse.julialang.org/t/help-setting-up-cuda-jl-and-cutensors/85505 "2022-08-09T08:21:03Z")

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Hi all, I am having trouble using CUDA.jl and cuTENSOR and would appreciate your help. I’m looking to use the ITensors.jl library with GPU acceleration (via ITensorGPU), which uses CUDA and cuTENSORS. I am running this …

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## [Changing domain for Fourier](https://discourse.julialang.org/t/changing-domain-for-fourier/85331)

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**Author:** [@andreasvarga](https://discourse.julialang.org/u/andreasvarga)\
**Replies:** 5\
**Last updated:** [August 9, 2022, 5:52am UTC](https://discourse.julialang.org/t/changing-domain-for-fourier/85331 "2022-08-09T05:52:02Z")

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I am using ApproxFun.jl as basis to define and manipulate periodic matrices within the PeridicSystems.jl, a collection of tools dedicated for handling periodic systems. I consider ApproxFun.jl a valuable tool for my purp…

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## [Component based ModelingToolkit](https://discourse.julialang.org/t/component-based-modelingtoolkit/85499)

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**Author:** [@JOAO\_PEREIRA](https://discourse.julialang.org/u/JOAO_PEREIRA)\
**Replies:** 1\
**Last updated:** [August 8, 2022, 9:45pm UTC](https://discourse.julialang.org/t/component-based-modelingtoolkit/85499 "2022-08-08T21:45:34Z")

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Hi, I would like to solve the system below as a component based modeling. DifferentialEquations is a possibility to solve as steady states. ‘’’ using ModelingToolkit, NonlinearSolve function plant\_7\_1\_b() ModelingToo…

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## [Pushing Julia/statistics development](https://discourse.julialang.org/t/pushing-julia-statistics-development/80111)

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**Author:** [@Ajay\_Shah](https://discourse.julialang.org/u/Ajay_Shah)\
**Replies:** 14\
**Last updated:** [August 8, 2022, 6:52pm UTC](https://discourse.julialang.org/t/pushing-julia-statistics-development/80111 "2022-08-08T18:52:09Z")

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Julia is great, but there are many limitations in putting it to work for doing statistics. With the help of Viral, Alan, and @bkamins, a bunch of us got going on a systematic attack on this problem. We have gone after th…

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## [Error reading an XLSX file](https://discourse.julialang.org/t/error-reading-an-xlsx-file/85352)

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**Author:** [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Replies:** 2\
**Last updated:** [August 8, 2022, 6:20pm UTC](https://discourse.julialang.org/t/error-reading-an-xlsx-file/85352 "2022-08-08T18:20:58Z")

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Hello everybody I’m having trouble reading the fields from my XLSX file, when I try this error message appears: MethodError: no method matching iterate(::XLSX.DataTable) using DataFrames, XLSX r = string(@\_\_DIR\_\_,"\\\\t…

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## [PowerModels/PowerModelsDistribution lack of documentation for storage models](https://discourse.julialang.org/t/powermodels-powermodelsdistribution-lack-of-documentation-for-storage-models/85358)

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**Author:** [@apigott](https://discourse.julialang.org/u/apigott)\
**Replies:** 3\
**Last updated:** [August 8, 2022, 4:58pm UTC](https://discourse.julialang.org/t/powermodels-powermodelsdistribution-lack-of-documentation-for-storage-models/85358 "2022-08-08T16:58:32Z")

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Hi! New to PM/PMD and currently trying to figure out the OPF with a storage model, unfortunately I’m getting pretty stumped by the results dictionary. I attempted adding storage with the following: case\_file = "../Powe…

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## [How to deploy MVC server to Nginx](https://discourse.julialang.org/t/how-to-deploy-mvc-server-to-nginx/85363)

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**Author:** [@Jack\_N](https://discourse.julialang.org/u/Jack_N)\
**Replies:** 1\
**Last updated:** [August 8, 2022, 4:53pm UTC](https://discourse.julialang.org/t/how-to-deploy-mvc-server-to-nginx/85363 "2022-08-08T16:53:42Z")

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I tried following the tutorial at the link below to set up Nginx with my website, but I am confused about what folder to pick as the Nginx config root since my landing html page is in the /app/resources/resource/views, n…

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## [GaussianMixtures.jl - Equivalent of sklearn GaussianMixture.predict](https://discourse.julialang.org/t/gaussianmixtures-jl-equivalent-of-sklearn-gaussianmixture-predict/85480)

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**Author:** [@vikram-s-narayan](https://discourse.julialang.org/u/vikram-s-narayan)\
**Replies:** 0\
**Last updated:** [August 8, 2022, 2:30pm UTC](https://discourse.julialang.org/t/gaussianmixtures-jl-equivalent-of-sklearn-gaussianmixture-predict/85480 "2022-08-08T14:30:49Z")

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I’m trying to recreate the equivalent of SKLearn’s documentation example with GaussianMixtures.jl. The SKLearn example is below: import numpy as np from sklearn.mixture import GaussianMixture X = np.array(\[\[1, 2\], \[1, …

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## [Resources for Differentiable Programming](https://discourse.julialang.org/t/resources-for-differentiable-programming/85369)

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**Author:** [@franfram](https://discourse.julialang.org/u/franfram)\
**Replies:** 3\
**Last updated:** [August 8, 2022, 1:19pm UTC](https://discourse.julialang.org/t/resources-for-differentiable-programming/85369 "2022-08-08T13:19:06Z")

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Hello everyone, I’m looking for workshops or another type of resource for learning differentiable programming with Julia (other than julia’s documentation on differentiable programming packages like Zygote). Any resour…

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## [Makie, JSServe and Observables: Can I wrap whole figures in Observables?](https://discourse.julialang.org/t/makie-jsserve-and-observables-can-i-wrap-whole-figures-in-observables/82670)

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**Author:** [@marcpabst](https://discourse.julialang.org/u/marcpabst)\
**Replies:** 1\
**Last updated:** [August 8, 2022, 12:38am UTC](https://discourse.julialang.org/t/makie-jsserve-and-observables-can-i-wrap-whole-figures-in-observables/82670 "2022-08-08T00:38:18Z")

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Hi there! Mostly a question for @sdanisch I guess, but maybe others know as well… I’m creating interactive plots that work offline using WGLMakie and JSServe. For this, I have a custom function that takes a function wit…

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## [How to use elements of a N\*M elements Vector of Vector for a constraint](https://discourse.julialang.org/t/how-to-use-elements-of-a-n-m-elements-vector-of-vector-for-a-constraint/85295)

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**Author:** [@Optimization](https://discourse.julialang.org/u/Optimization)\
**Replies:** 5\
**Last updated:** [August 7, 2022, 12:28pm UTC](https://discourse.julialang.org/t/how-to-use-elements-of-a-n-m-elements-vector-of-vector-for-a-constraint/85295 "2022-08-07T12:28:50Z")

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Hi, We have two sets A = \[1,2,...,N\] and B = \[1,2,...,M\]. There are two other sets SA, SB associated with A and Bwhich are N-elements and M-elemets vector of vector. A = \[1:N\] B = \[1:M\] SA = \[ \[some stuff for 1\] , \[s…

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## [How to precompile Makie?](https://discourse.julialang.org/t/how-to-precompile-makie/20345)

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**Author:** [@cserteGT3](https://discourse.julialang.org/u/cserteGT3)\
**Replies:** 6\
**Last updated:** [August 7, 2022, 10:45am UTC](https://discourse.julialang.org/t/how-to-precompile-makie/20345 "2022-08-07T10:45:01Z")

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I tried to precompile Makie, because it seemed easy: # add PackageCompiler Pkg.add("PackageCompiler") using PackageCompiler # This is not well tested, so please be careful # The safe option: PackageCompiler.compile\_pa…

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## [Plot with ribbon in MonteCarloMeasurements.jl](https://discourse.julialang.org/t/plot-with-ribbon-in-montecarlomeasurements-jl/85360)

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**Author:** [@Firstname\_Lastname](https://discourse.julialang.org/u/Firstname_Lastname)\
**Replies:** 4\
**Last updated:** [August 7, 2022, 9:24am UTC](https://discourse.julialang.org/t/plot-with-ribbon-in-montecarlomeasurements-jl/85360 "2022-08-07T09:24:18Z")

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Given a function y = a \* x + b where a and b are of the type Particles. By using MonteCarloMeasurements.jl and Plots.jl, I can plot many sample function y(x) as follows using MonteCarloMeasurements using Plots p = Part…

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## [Find Power Spectrum and Density](https://discourse.julialang.org/t/find-power-spectrum-and-density/85415)

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**Author:** [@natgeo-wong](https://discourse.julialang.org/u/natgeo-wong)\
**Replies:** 4\
**Last updated:** [August 7, 2022, 5:58am UTC](https://discourse.julialang.org/t/find-power-spectrum-and-density/85415 "2022-08-07T05:58:54Z")

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Hi! I have a set of time-series data. I’d just like to ask, are there packages available to decompose the signal into the power spectrum and the density/amplitude? And also, I would like to ask if there is a way to do…

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## [Numerical integration of vector-valued functions using Julia packages](https://discourse.julialang.org/t/numerical-integration-of-vector-valued-functions-using-julia-packages/85413)

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**Author:** [@danrib07](https://discourse.julialang.org/u/danrib07)\
**Replies:** 3\
**Last updated:** [August 6, 2022, 10:26pm UTC](https://discourse.julialang.org/t/numerical-integration-of-vector-valued-functions-using-julia-packages/85413 "2022-08-06T22:26:32Z")

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Hi, I need to compute the following integral \\int\_{0}^{t} e^{At'}b \\,dt' where A is a real-valued matrix of size (m x m), and b is a real-valued column vector of size (m x 1). The current method I have implemented to c…

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## [Significant CUDA.jl memory allocations outside of main pool?](https://discourse.julialang.org/t/significant-cuda-jl-memory-allocations-outside-of-main-pool/59991)

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**Author:** [@jpdoane](https://discourse.julialang.org/u/jpdoane)\
**Replies:** 2\
**Last updated:** [August 6, 2022, 7:35pm UTC](https://discourse.julialang.org/t/significant-cuda-jl-memory-allocations-outside-of-main-pool/59991 "2022-08-06T19:35:53Z")

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I have been benchmarking various CUDA.jl kernels with large CuArrays, and have been experiencing out of GPU memory errors after running the same function repeatedly. CUDA.jl seems to be holding onto significant amounts o…

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## [\[ANN\] NTupleKmers.jl](https://discourse.julialang.org/t/ann-ntuplekmers-jl/40474)

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**Author:** [@Ward9250](https://discourse.julialang.org/u/Ward9250)\
**Replies:** 0\
**Last updated:** [May 30, 2020, 4:09pm UTC](https://discourse.julialang.org/t/ann-ntuplekmers-jl/40474 "2020-05-30T16:09:20Z")

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Hi Everyone, Following my earlier murmerings on Kmers and NTuples on Slack and here: Ntuple aggressive specialisation and boxed values I decided to create an experimental package repo on BioJulia that can house my NTu…

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## [Copulas in Julia?](https://discourse.julialang.org/t/copulas-in-julia/10285)

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**Author:** [@floswald](https://discourse.julialang.org/u/floswald)\
**Replies:** 17\
**Last updated:** [August 6, 2022, 11:24am UTC](https://discourse.julialang.org/t/copulas-in-julia/10285 "2022-08-06T11:24:47Z")

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hi all, I am looking for a native julia Copula package. I have come across https://github.com/JuliaFinMetriX/Copulas.jl but it seems quite something to install - plus I can’t figure out the most basic things from the d…

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## [@gif without saving all images](https://discourse.julialang.org/t/gif-without-saving-all-images/85160)

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**Author:** [@qwerty](https://discourse.julialang.org/u/qwerty)\
**Replies:** 5\
**Last updated:** [August 6, 2022, 10:22am UTC](https://discourse.julialang.org/t/gif-without-saving-all-images/85160 "2022-08-06T10:22:47Z")

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Is it possible to generate an animation with @gif without saving all images to disk?

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## [Regarding use of Max in Jump code](https://discourse.julialang.org/t/regarding-use-of-max-in-jump-code/84837)

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**Author:** [@Ali9266](https://discourse.julialang.org/u/Ali9266)\
**Replies:** 30\
**Last updated:** [August 5, 2022, 11:57pm UTC](https://discourse.julialang.org/t/regarding-use-of-max-in-jump-code/84837 "2022-08-05T23:57:31Z")

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Objective function is to minimize Z(i) =T(i)+E(i) ; i = 1:n where T(i) = max\[ x(i) - y(i), 0\] and E = max\[ y(i) - x(i), 0\] Please help Also , how can we take absolute values in Jump

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