# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=448

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**Page:** 449

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## [Assigning to an array that is on the GPU](https://discourse.julialang.org/t/assigning-to-an-array-that-is-on-the-gpu/38498)

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**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 2\
**Last updated:** [May 2, 2020, 10:30pm UTC](https://discourse.julialang.org/t/assigning-to-an-array-that-is-on-the-gpu/38498 "2020-05-02T22:30:42Z")

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Suppose an array is on the gpu. In assigning new values to it, should we put the right hand side of the assignment on the gpu first before doing the assignment. I.e., A = cu(rand(5,1)) B = zeros(5,1) is this ok …

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## [Optimize 0-1 loss in MIP](https://discourse.julialang.org/t/optimize-0-1-loss-in-mip/33027)

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**Author:** [@Maximilian](https://discourse.julialang.org/u/Maximilian)\
**Replies:** 5\
**Last updated:** [May 2, 2020, 7:18pm UTC](https://discourse.julialang.org/t/optimize-0-1-loss-in-mip/33027 "2020-05-02T19:18:18Z")

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I am currently trying to solve the following optimization problem Where N is the number of observations on \\mathbf{x} predictors, and y \\in \\{-1, 1\\} is a binary vector of length N, \\lambda has to be integer, C\_0, C\_…

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## [Extract coordinates from a specific contour](https://discourse.julialang.org/t/extract-coordinates-from-a-specific-contour/38393)

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**Author:** [@Cristian\_Suciava](https://discourse.julialang.org/u/Cristian_Suciava)\
**Replies:** 6\
**Last updated:** [May 2, 2020, 6:38pm UTC](https://discourse.julialang.org/t/extract-coordinates-from-a-specific-contour/38393 "2020-05-02T18:38:30Z")

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I am new with Julia. Is there a library, a way, to extract cartesian coordinates from a drawing? At the end I need an array with point from a drawing.

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## [Sampling from Delta in Turing](https://discourse.julialang.org/t/sampling-from-delta-in-turing/38577)

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**Author:** [@trahflow](https://discourse.julialang.org/u/trahflow)\
**Replies:** 8\
**Last updated:** [May 2, 2020, 1:55pm UTC](https://discourse.julialang.org/t/sampling-from-delta-in-turing/38577 "2020-05-02T13:55:21Z")

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Hi PPL people :slight\_smile: I was trying to build a very simple model of censored sales, and was naively trying: @model mymodel(sales) = begin lam ~ Gamma(2, 3) stocks ~ Categorical(ones(20) ./ 20) demand …

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## [\[ANN\] DataFrameDBs.jl](https://discourse.julialang.org/t/ann-dataframedbs-jl/35718)

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**Author:** [@waralex](https://discourse.julialang.org/u/waralex)\
**Replies:** 60\
**Last updated:** [May 2, 2020, 3:09pm UTC](https://discourse.julialang.org/t/ann-dataframedbs-jl/35718 "2020-05-02T15:09:59Z")

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Hi all! Julia is my hobby and I had some free time for the last 4 weeks, so here is the first results of my experiments GitHub - waralex/DataFrameDBs.jl: The DateFrameDBs is the prototype of persistent, space efficient …

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## [Statistics package](https://discourse.julialang.org/t/statistics-package/38530)

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**Author:** [@mayar](https://discourse.julialang.org/u/mayar)\
**Replies:** 4\
**Last updated:** [May 2, 2020, 6:02am UTC](https://discourse.julialang.org/t/statistics-package/38530 "2020-05-02T06:02:48Z")

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Hello, Could you recommend me a package that I can use to find some statistics and how can I install it in Julia by ATOM Thank you

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## [Avoiding memory allocations when simulating combinations of parameter sets in ParallelEnsemble](https://discourse.julialang.org/t/avoiding-memory-allocations-when-simulating-combinations-of-parameter-sets-in-parallelensemble/38583)

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**Author:** [@MFairley](https://discourse.julialang.org/u/MFairley)\
**Replies:** 3\
**Last updated:** [May 2, 2020, 3:58am UTC](https://discourse.julialang.org/t/avoiding-memory-allocations-when-simulating-combinations-of-parameter-sets-in-parallelensemble/38583 "2020-05-02T03:58:28Z")

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I have an array of arrays p = \[a, b\] for p in ode\_model!(du, u, p, t). I am running a ParallelEnsemble where I want to simulate all combinations of a in A and b in B where A and B are arrays of arrays. I noticed that usi…

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## [Matrix profile calculation: STOMP method](https://discourse.julialang.org/t/matrix-profile-calculation-stomp-method/25389)

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**Author:** [@taqtiqa-mark](https://discourse.julialang.org/u/taqtiqa-mark)\
**Replies:** 1\
**Last updated:** [May 1, 2020, 4:13am UTC](https://discourse.julialang.org/t/matrix-profile-calculation-stomp-method/25389 "2020-05-01T04:13:37Z")

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Hi, Is there a Julia package that implements the matrix profile calculation using the STOMP method, i.e. corresponds to Stumpy’s … scalable library that efficiently computes something called the matrix profile Alter…

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## [Number of integration steps used in DifferentialEquations.jl with save\_everystep=false](https://discourse.julialang.org/t/number-of-integration-steps-used-in-differentialequations-jl-with-save-everystep-false/38575)

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**Author:** [@wsshin](https://discourse.julialang.org/u/wsshin)\
**Replies:** 1\
**Last updated:** [May 1, 2020, 10:27pm UTC](https://discourse.julialang.org/t/number-of-integration-steps-used-in-differentialequations-jl-with-save-everystep-false/38575 "2020-05-01T22:27:13Z")

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Do solvers in DifferentialEquations.jl count the number of integration steps they used? length(sol) is close because it returns the number of recorded solutions, but if I use save\_everystep=false for speedup, length(sol…

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## [MINLP problem](https://discourse.julialang.org/t/minlp-problem/38566)

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**Author:** [@GiuliaM](https://discourse.julialang.org/u/GiuliaM)\
**Replies:** 1\
**Last updated:** [May 1, 2020, 7:32pm UTC](https://discourse.julialang.org/t/minlp-problem/38566 "2020-05-01T19:32:51Z")

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Hi everyone! I’m fairly new to Julia. I’m trying to solve a MINLP problem with Juniper. I have 4 continuous variables (x\[1:4\]) and a binary variable (xbin). I have the following relationship between x\[1\] and xbin: if …

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## [Infeasibility on SCIP - Problem feasible in other solvers](https://discourse.julialang.org/t/infeasibility-on-scip-problem-feasible-in-other-solvers/38507)

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**Author:** [@Diego](https://discourse.julialang.org/u/Diego)\
**Replies:** 7\
**Last updated:** [May 1, 2020, 6:35pm UTC](https://discourse.julialang.org/t/infeasibility-on-scip-problem-feasible-in-other-solvers/38507 "2020-05-01T18:35:48Z")

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Dear Team, I have been trying SCIP but whatever I do it always returns an infeasibility. Other solvers I have tried do deliver a solution. The message I keep getting on an on for different problems is: violation: rig…

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## [\[JuMP\] Container Functionality Feature Requests](https://discourse.julialang.org/t/jump-container-functionality-feature-requests/37771)

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**Author:** [@pulsipher](https://discourse.julialang.org/u/pulsipher)\
**Replies:** 10\
**Last updated:** [May 1, 2020, 7:59am UTC](https://discourse.julialang.org/t/jump-container-functionality-feature-requests/37771 "2020-05-01T07:59:46Z")

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I have been using with JuMP’s container types as I am developing my JuMP extension and have two observations that I think would make for 2 relatively simple additions. Observation 1: According to the extension of Base.k…

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## [How to know the elapse time using GLPK solver](https://discourse.julialang.org/t/how-to-know-the-elapse-time-using-glpk-solver/38511)

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**Author:** [@lausilvag](https://discourse.julialang.org/u/lausilvag)\
**Replies:** 1\
**Last updated:** [May 1, 2020, 12:21am UTC](https://discourse.julialang.org/t/how-to-know-the-elapse-time-using-glpk-solver/38511 "2020-05-01T00:21:58Z")

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Hi! I am using the GLPK solver and in the output doesn’t appear the elapsed time: GLPK Simplex Optimizer, v4.64 0: obj = 0.000000000e+000 inf = 3.846e+001 (1) 3: obj = 1.144956706e+007 inf = 0.000e+000 (0) 13: …

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## [Unexpected memory allocation inside ODE function with EnsembleProblem](https://discourse.julialang.org/t/unexpected-memory-allocation-inside-ode-function-with-ensembleproblem/38492)

<div class="topic-metadata">

**Author:** [@MFairley](https://discourse.julialang.org/u/MFairley)\
**Replies:** 6\
**Last updated:** [April 30, 2020, 7:07pm UTC](https://discourse.julialang.org/t/unexpected-memory-allocation-inside-ode-function-with-ensembleproblem/38492 "2020-04-30T19:07:06Z")

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I am unsure if this is an issue or I just don’t understand how memory allocation works with ensemble problems. I start Julia with --track-allocation=user and run the following small script using DifferentialEquations u…

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## [Plots with string xaxis and y-errorbars gives error](https://discourse.julialang.org/t/plots-with-string-xaxis-and-y-errorbars-gives-error/37228)

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**Author:** [@transarcus](https://discourse.julialang.org/u/transarcus)\
**Replies:** 3\
**Last updated:** [April 30, 2020, 11:48am UTC](https://discourse.julialang.org/t/plots-with-string-xaxis-and-y-errorbars-gives-error/37228 "2020-04-30T11:48:24Z")

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Plotting a bar plot with text as the xaxis gives me an error where it didn’t use to. I’m using Julia 1.4 and plots v1.0.5 plot(\[“a”,“b”\],\[10,2\],yerr=\[1,1\],st=:bar) gives the error “Cannot convert an object of type Strin…

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## [Flux vs Keras time series prediction performance](https://discourse.julialang.org/t/flux-vs-keras-time-series-prediction-performance/38421)

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**Author:** [@Volker](https://discourse.julialang.org/u/Volker)\
**Replies:** 3\
**Last updated:** [April 30, 2020, 7:45am UTC](https://discourse.julialang.org/t/flux-vs-keras-time-series-prediction-performance/38421 "2020-04-30T07:45:45Z")

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Hi, I compare the prediction quality of two neural networks on a time series. One trained by Keras and one trained by Flux. Unfortunately I´m not able to achieve the same quality (see figure) and I don´t know why. I…

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## [Status of Flux model zoo](https://discourse.julialang.org/t/status-of-flux-model-zoo/38130)

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**Author:** [@Emmanuel-R8](https://discourse.julialang.org/u/Emmanuel-R8)\
**Replies:** 6\
**Last updated:** [April 30, 2020, 6:39am UTC](https://discourse.julialang.org/t/status-of-flux-model-zoo/38130 "2020-04-30T06:39:03Z")

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I was interested in updating Flux’s model zoo since everything I tried is out of date. But I saw that there are a lot of pull requests which are outstanding. Is it still maintained? Did I miss an announcement on that? …

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## [Shared memory limitations](https://discourse.julialang.org/t/shared-memory-limitations/38391)

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**Author:** [@calebwin](https://discourse.julialang.org/u/calebwin)\
**Replies:** 4\
**Last updated:** [April 29, 2020, 10:16pm UTC](https://discourse.julialang.org/t/shared-memory-limitations/38391 "2020-04-29T22:16:48Z")

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My apologies if this has already been asked. But right now, what all operations are supported for shared memory in CUDANative.jl? is it likely that more stuff can/will be added in the future? or a better question - how h…

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## [What is "splatting" in flux (loss?)?](https://discourse.julialang.org/t/what-is-splatting-in-flux-loss/37548)

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**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 2\
**Last updated:** [April 29, 2020, 8:34pm UTC](https://discourse.julialang.org/t/what-is-splatting-in-flux-loss/37548 "2020-04-29T20:34:04Z")

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In the Flux docs for train! it says In case datapoints d are of numeric array type, assume no splatting is needed and compute the gradient of loss(d) . What does “splatting” mean here? I am guessing that what this m…

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## [Visualizing Jacobians/Gradients(?) - How's this?](https://discourse.julialang.org/t/visualizing-jacobians-gradients-hows-this/36799)

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**Author:** [@mthelm85](https://discourse.julialang.org/u/mthelm85)\
**Replies:** 3\
**Last updated:** [April 29, 2020, 7:22pm UTC](https://discourse.julialang.org/t/visualizing-jacobians-gradients-hows-this/36799 "2020-04-29T19:22:08Z")

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I’ve been studying calculus and in the online course I’m following, the instructor says (in relation to a plot of a particular function): the Jacobian is simply a vector that we can calculate for each location on this …

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## [Controlling save behavior and performance of DiffEqBiological](https://discourse.julialang.org/t/controlling-save-behavior-and-performance-of-diffeqbiological/38387)

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**Author:** [@gideonsimpson](https://discourse.julialang.org/u/gideonsimpson)\
**Replies:** 6\
**Last updated:** [April 29, 2020, 2:53pm UTC](https://discourse.julialang.org/t/controlling-save-behavior-and-performance-of-diffeqbiological/38387 "2020-04-29T14:53:57Z")

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I’m interested in the bistable Schlogl model, which, under resevoir assumptions on species A and B, can be represented inside of DiffEqBiological as schlogl = @reaction\_network begin c1 \* a/ V, 2\*S --\> 3\*S c2 / …

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## [Custom width intergers in Clang/LLVM](https://discourse.julialang.org/t/custom-width-intergers-in-clang-llvm/38141)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 2\
**Last updated:** [April 28, 2020, 9:33pm UTC](https://discourse.julialang.org/t/custom-width-intergers-in-clang-llvm/38141 "2020-04-28T21:33:26Z")

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Specialised types for different problems? Now there is a thought!

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## [Combining pmap with EnsembleProblem](https://discourse.julialang.org/t/combining-pmap-with-ensembleproblem/38383)

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**Author:** [@MFairley](https://discourse.julialang.org/u/MFairley)\
**Replies:** 5\
**Last updated:** [April 28, 2020, 8:40pm UTC](https://discourse.julialang.org/t/combining-pmap-with-ensembleproblem/38383 "2020-04-28T20:40:59Z")

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I have an EnsembleProblem defined that calculates outputs for a range of different start times. I need to repeat the the whole EnsembleProblem many times for different parameter values and save the output of each Ensembl…

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## [Thoughts on Jax vs CuArrays and Zygote](https://discourse.julialang.org/t/thoughts-on-jax-vs-cuarrays-and-zygote/19915)

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**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 10\
**Last updated:** [April 28, 2020, 3:00pm UTC](https://discourse.julialang.org/t/thoughts-on-jax-vs-cuarrays-and-zygote/19915 "2020-04-28T15:00:31Z")

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Google’s JAX looks like a combination of CuArrays and Zygote for Python. I wonder if anyone can compare and contrast Jax with CuArrays and Zygote? I can’t gather how Jax is different apart from the fact that it compiles…

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## [Just wrote a package for playing with SAT solvers](https://discourse.julialang.org/t/just-wrote-a-package-for-playing-with-sat-solvers/37822)

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**Author:** [@Xing\_Shi\_Cai](https://discourse.julialang.org/u/Xing_Shi_Cai)\
**Replies:** 2\
**Last updated:** [April 28, 2020, 1:40pm UTC](https://discourse.julialang.org/t/just-wrote-a-package-for-playing-with-sat-solvers/37822 "2020-04-28T13:40:10Z")

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Hi everyone, I just put a small package BEE.jl on github. If you want to play with SAT solvers, this might be helpful.

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## [Passing along data from one time step to the next using DifferentialEquations.jl](https://discourse.julialang.org/t/passing-along-data-from-one-time-step-to-the-next-using-differentialequations-jl/38335)

<div class="topic-metadata">

**Author:** [@bielim](https://discourse.julialang.org/u/bielim)\
**Replies:** 5\
**Last updated:** [April 28, 2020, 2:28am UTC](https://discourse.julialang.org/t/passing-along-data-from-one-time-step-to-the-next-using-differentialequations-jl/38335 "2020-04-28T02:28:20Z")

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I am using DifferentialEquations.jl to solve an ODE of the form \\frac{d\\boldsymbol{M}}{dt} = \\boldsymbol{f}(\\boldsymbol{M}), where \\boldsymbol{M} = \[M\_1, ..., M\_k\]^T, and \\boldsymbol{f} = \[f\_1(\\boldsymbol{M}), ..., f\_k(\\…

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## [Tree limit JuMP 0.21](https://discourse.julialang.org/t/tree-limit-jump-0-21/38135)

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**Author:** [@baprata](https://discourse.julialang.org/u/baprata)\
**Replies:** 2\
**Last updated:** [April 27, 2020, 8:43pm UTC](https://discourse.julialang.org/t/tree-limit-jump-0-21/38135 "2020-04-27T20:43:43Z")

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I am modeling an optimization problem within Julia/Atom and CPLEX. I need to control the tree limit size. What is the syntax for the tree limit in JuMP 0.21? Thanks in advance, Bruno

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## [Deactivating and reactivating JuMP constraints](https://discourse.julialang.org/t/deactivating-and-reactivating-jump-constraints/38315)

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**Author:** [@Tomas\_Uribe](https://discourse.julialang.org/u/Tomas_Uribe)\
**Replies:** 1\
**Last updated:** [April 27, 2020, 7:33pm UTC](https://discourse.julialang.org/t/deactivating-and-reactivating-jump-constraints/38315 "2020-04-27T19:33:44Z")

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Is there a way to deactivate and reactivate JuMP constraints that are tied to a model? I found delete(model, constraint), but once deleted, constraints can’t be added back again.

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## [Lagrangian Function](https://discourse.julialang.org/t/lagrangian-function/38287)

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**Author:** [@mayar](https://discourse.julialang.org/u/mayar)\
**Replies:** 18\
**Last updated:** [April 27, 2020, 1:04pm UTC](https://discourse.julialang.org/t/lagrangian-function/38287 "2020-04-27T13:04:43Z")

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Hello everyone, I am trying to solve an optimization problem by using the lagrangian function, which package is best suited for this task specially because I need the equality constraint multipliers to be returned as th…

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## [Reworking Distributions.jl](https://discourse.julialang.org/t/reworking-distributions-jl/32339)

<div class="topic-metadata">

**Author:** [@cscherrer](https://discourse.julialang.org/u/cscherrer)\
**Replies:** 51\
**Last updated:** [April 27, 2020, 2:33am UTC](https://discourse.julialang.org/t/reworking-distributions-jl/32339 "2020-04-27T02:33:35Z")

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Hello all, I’ve been thinking some more about a refactoring of Distributions.jl, and I’d like to ask for feedback on a proof of concept. First, the abstract types: abstract type Sampleable{P,X} end abstract type Dist…

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