# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=565

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**Page:** 566

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## [Call for bikeshedding: Updated ParameterizedFunction Syntax](https://discourse.julialang.org/t/call-for-bikeshedding-updated-parameterizedfunction-syntax/2738)

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**Author:** [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Replies:** 11\
**Last updated:** [March 20, 2017, 2:49pm UTC](https://discourse.julialang.org/t/call-for-bikeshedding-updated-parameterizedfunction-syntax/2738 "2017-03-20T14:49:13Z")

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I know people like bikeshedding syntax :slight\_smile:. I am looking to update the syntax for the macros in DifferentialEquations.jl (ParameterizedFunctions.jl) for “easily defining diffeqs”. I am looking for a syntax tha…

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## [An elegant way to construct recursive objective?](https://discourse.julialang.org/t/an-elegant-way-to-construct-recursive-objective/2503)

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**Author:** [@xqrongm](https://discourse.julialang.org/u/xqrongm)\
**Replies:** 5\
**Last updated:** [March 20, 2017, 4:33am UTC](https://discourse.julialang.org/t/an-elegant-way-to-construct-recursive-objective/2503 "2017-03-20T04:33:51Z")

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I need to fit a model on a vector f of length n, where f\[i\] is recursively calculated from f\[i-1\]. There is another vector d of length n related to f in the following way: f\[i\] = f0 + d\[i\] d\[1\] = d0 + k \* log(1 + d0 / k…

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## [Interested in Summer of Code](https://discourse.julialang.org/t/interested-in-summer-of-code/2337)

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**Author:** [@americast](https://discourse.julialang.org/u/americast)\
**Replies:** 6\
**Last updated:** [March 18, 2017, 11:59am UTC](https://discourse.julialang.org/t/interested-in-summer-of-code/2337 "2017-03-18T11:59:48Z")

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Hello everyone, I am interested in applying for Google Summer of Code as a student this year under Julia. I would like to work on building a package similar to BinDeps, which would enable us to create data providing pac…

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## [RE: GSoC - Interactivity and visualization tools](https://discourse.julialang.org/t/re-gsoc-interactivity-and-visualization-tools/2742)

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**Author:** [@MA\_Laforge](https://discourse.julialang.org/u/MA_Laforge)\
**Replies:** 1\
**Last updated:** [March 17, 2017, 9:27pm UTC](https://discourse.julialang.org/t/re-gsoc-interactivity-and-visualization-tools/2742 "2017-03-17T21:27:44Z")

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Not sure where else to add a comment: I would like to add another interesting Python-based reference tool to the mix: guiqwt: GitHub - PlotPyStack/guiqwt: Efficient 2D plotting Python library based on PythonQwt It app…

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## [CUDAnative on macOS X](https://discourse.julialang.org/t/cudanative-on-macos-x/2671)

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**Author:** [@jheinen](https://discourse.julialang.org/u/jheinen)\
**Replies:** 13\
**Last updated:** [March 17, 2017, 6:05pm UTC](https://discourse.julialang.org/t/cudanative-on-macos-x/2671 "2017-03-17T18:05:54Z")

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Did anyone manage to get CUDAnative running on macOS X? I could successfully install CUDAdrv … push!(Libdl.DL\_LOAD\_PATH, "/usr/local/cuda/lib") Pkg.add("CUDAdrv") … but trying to add CUDAnative fails with LLVM errors:…

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## [Eigs and cryptic arparck errors](https://discourse.julialang.org/t/eigs-and-cryptic-arparck-errors/2722)

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**Author:** [@maarten\_van\_damme](https://discourse.julialang.org/u/maarten_van_damme)\
**Replies:** 4\
**Last updated:** [March 17, 2017, 4:33pm UTC](https://discourse.julialang.org/t/eigs-and-cryptic-arparck-errors/2722 "2017-03-17T16:33:50Z")

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I’m trying to use eigs and I’m running into arparck errors. More specifically, when eigs doesn’t converge the function itself doesn’t throw or return some kind of flag (even though that is what the documentation seemed t…

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## [Plots.jl - No method matching expand\_extrema](https://discourse.julialang.org/t/plots-jl-no-method-matching-expand-extrema/2717)

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**Author:** [@josimar](https://discourse.julialang.org/u/josimar)\
**Replies:** 1\
**Last updated:** [March 17, 2017, 5:25am UTC](https://discourse.julialang.org/t/plots-jl-no-method-matching-expand-extrema/2717 "2017-03-17T05:25:58Z")

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Hi, I am using the Plots.jl with the GR backend. I am trying to make the following plot: plot( SSE\[1\].Mag, SSE\[1\].N ) Where both SSE\[1\].Mag and SSE\[1\].N are of types Array{Any,1} However, I am getting the error below…

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## [Issue with Julia MPC Out of Bounds Error](https://discourse.julialang.org/t/issue-with-julia-mpc-out-of-bounds-error/2720)

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**Author:** [@Angshuman\_Goswami](https://discourse.julialang.org/u/Angshuman_Goswami)\
**Replies:** 1\
**Last updated:** [March 16, 2017, 10:57pm UTC](https://discourse.julialang.org/t/issue-with-julia-mpc-out-of-bounds-error/2720 "2017-03-16T22:57:57Z")

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\#!/usr/bin/env julia #= \*\* Licensing Information: You are free to use or extend these projects for \*\* \*\* education or research purposes provided that (1) you retain this notice\*\* \*\* and (2) you provide clear attribut…

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## [Dense gridlines in Plots.jl](https://discourse.julialang.org/t/dense-gridlines-in-plots-jl/1499)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 4\
**Last updated:** [March 16, 2017, 12:41pm UTC](https://discourse.julialang.org/t/dense-gridlines-in-plots-jl/1499 "2017-03-16T12:41:48Z")

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In a MWE using Plots x = Date(1990,1):Dates.Month(1):Date(2016,1) y = \[rand()+1.0 for \_ in x\] plot(x, y) how could I get vertical grid lines at every year (eg on Jan 1) or every 5 years in the plot? Using various backe…

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## [Need some pointers to implement scheme based routing](https://discourse.julialang.org/t/need-some-pointers-to-implement-scheme-based-routing/2678)

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**Author:** [@Sarvjeet](https://discourse.julialang.org/u/Sarvjeet)\
**Replies:** 0\
**Last updated:** [March 15, 2017, 1:53pm UTC](https://discourse.julialang.org/t/need-some-pointers-to-implement-scheme-based-routing/2678 "2017-03-15T13:53:16Z")

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I have made a pull request here implementing scheme based routing in Mux. I don’t know how to test it (details are mentioned in the pull request), could someone please take a look at it. Thanks in advance.

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## [Showing a captured video sequence with annotations](https://discourse.julialang.org/t/showing-a-captured-video-sequence-with-annotations/2625)

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**Author:** [@TsurHerman](https://discourse.julialang.org/u/TsurHerman)\
**Replies:** 21\
**Last updated:** [March 15, 2017, 9:44am UTC](https://discourse.julialang.org/t/showing-a-captured-video-sequence-with-annotations/2625 "2017-03-15T09:44:53Z")

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Hi , For debugging an object tracking system, I need to be able to display captured images and to easily annotate those images with text. I am looking for a solution that is not dependent on openCV. I don’t care abou…

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## [Dropout in mxnet](https://discourse.julialang.org/t/dropout-in-mxnet/2667)

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**Author:** [@Patrik\_Waldmann](https://discourse.julialang.org/u/Patrik_Waldmann)\
**Replies:** 0\
**Last updated:** [March 14, 2017, 7:31pm UTC](https://discourse.julialang.org/t/dropout-in-mxnet/2667 "2017-03-14T19:31:10Z")

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I’m trying to understand how to use dropout in mxnet and start with a simple regression example: #= Regression with dropout =# using MXNet # create training and evaluation data sets url = "https://archive.ics.uci.edu/m…

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## [Issue Solving BQPs with JuMP+CPLEX](https://discourse.julialang.org/t/issue-solving-bqps-with-jump-cplex/2624)

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**Author:** [@omalled](https://discourse.julialang.org/u/omalled)\
**Replies:** 8\
**Last updated:** [March 14, 2017, 5:17pm UTC](https://discourse.julialang.org/t/issue-solving-bqps-with-jump-cplex/2624 "2017-03-14T17:17:34Z")

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I am having some trouble solving binary quadratic programs with JuMP and CPLEX. Here is some code that illustrates the problem: import JuMP import CPLEX function bqp(Q, c) m = JuMP.Model(solver=CPLEX.CplexSolver()) @…

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## [What data structure to use to hold large categorial dataset for analytics?](https://discourse.julialang.org/t/what-data-structure-to-use-to-hold-large-categorial-dataset-for-analytics/2646)

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**Author:** [@ilanggear](https://discourse.julialang.org/u/ilanggear)\
**Replies:** 3\
**Last updated:** [March 14, 2017, 8:53am UTC](https://discourse.julialang.org/t/what-data-structure-to-use-to-hold-large-categorial-dataset-for-analytics/2646 "2017-03-14T08:53:12Z")

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I have a dataset that is approximately 1 million rows by 40 columns of mostly categorical values, and I need to hold it in memory while I build indexes (themselves needing lots of memory) and do some ad-hoc analytics on …

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## [Is there any function to get the number of remaining messages in AWS SQS queue?](https://discourse.julialang.org/t/is-there-any-function-to-get-the-number-of-remaining-messages-in-aws-sqs-queue/2653)

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**Author:** [@jwu](https://discourse.julialang.org/u/jwu)\
**Replies:** 0\
**Last updated:** [March 14, 2017, 3:26am UTC](https://discourse.julialang.org/t/is-there-any-function-to-get-the-number-of-remaining-messages-in-aws-sqs-queue/2653 "2017-03-14T03:26:57Z")

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or just whether it is empty or not. I did not find any function in AWS.jl try catch is an alternative to tell whether the queue is empty or not, but seems not that clear.

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## [Evaluating explicitly the kernel for a Gaussian/Normal distribution](https://discourse.julialang.org/t/evaluating-explicitly-the-kernel-for-a-gaussian-normal-distribution/2632)

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**Author:** [@Bernal](https://discourse.julialang.org/u/Bernal)\
**Replies:** 1\
**Last updated:** [March 13, 2017, 9:02am UTC](https://discourse.julialang.org/t/evaluating-explicitly-the-kernel-for-a-gaussian-normal-distribution/2632 "2017-03-13T09:02:46Z")

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Hi folks, probably I’m attempting to discover “how to boil water” however I have faced some weird problems building a vector of values matching a Gaussian bell (I do NOT want to create a random variables vector that is…

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## [How does Loess decide how many sub-intervals to use for local regression?](https://discourse.julialang.org/t/how-does-loess-decide-how-many-sub-intervals-to-use-for-local-regression/2615)

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**Author:** [@KrishnaKanhaiya](https://discourse.julialang.org/u/KrishnaKanhaiya)\
**Replies:** 0\
**Last updated:** [March 12, 2017, 5:34am UTC](https://discourse.julialang.org/t/how-does-loess-decide-how-many-sub-intervals-to-use-for-local-regression/2615 "2017-03-12T05:34:05Z")

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Hi, I want to do local regression at each and every input point. For example: using Loess xs = sort(rand(100)) #100 input points p = 1 ys = exp(p\*tpoints) + 0.1 \* rand(100) model = loess(xs,ys) when I do model.bs …

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## [Using ApproxFun for dynamic programming](https://discourse.julialang.org/t/using-approxfun-for-dynamic-programming/1754)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 11\
**Last updated:** [March 11, 2017, 11:41am UTC](https://discourse.julialang.org/t/using-approxfun-for-dynamic-programming/1754 "2017-03-11T11:41:02Z")

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I am wondering how to use ApproxFun for dynamic programming. I know the methods themselves very well, and I can easily implement a Chebyshev or spline basis and do everything from scratch, but it would be nice to use exi…

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## [DataTables : convert Nullable{String}("14:00:00") to Dates.Minute](https://discourse.julialang.org/t/datatables-convert-nullable-string-1400-to-dates-minute/2543)

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**Author:** [@Fred](https://discourse.julialang.org/u/Fred)\
**Replies:** 13\
**Last updated:** [March 11, 2017, 10:05am UTC](https://discourse.julialang.org/t/datatables-convert-nullable-string-1400-to-dates-minute/2543 "2017-03-11T10:05:32Z")

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Hi, I have a DataTable with two columns of time and I want to compute the time duration between these 2 columns. The problem I have is to compute a duration with Nullable type. julia\> a, b (Nullable{String}("14:00:00"…

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## [Error creating animation w/Plots.jl](https://discourse.julialang.org/t/error-creating-animation-w-plots-jl/2602)

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**Author:** [@Sean\_McBane](https://discourse.julialang.org/u/Sean_McBane)\
**Replies:** 2\
**Last updated:** [March 11, 2017, 7:33am UTC](https://discourse.julialang.org/t/error-creating-animation-w-plots-jl/2602 "2017-03-11T07:33:22Z")

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I am trying to make an animation using Plots.jl; the simple interface is really great. Unfortunately, it doesn’t work. It appears to be passing an invalid argument for ImageMagick. The error I get is: Invalid Parameter …

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## [Plotlyjs - animation errors in examples https://juliaplots.github.io/examples/plotlyjs/](https://discourse.julialang.org/t/plotlyjs-animation-errors-in-examples-https-juliaplots-github-io-examples-plotlyjs/2599)

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**Author:** [@olegmikul](https://discourse.julialang.org/u/olegmikul)\
**Replies:** 4\
**Last updated:** [March 11, 2017, 12:39am UTC](https://discourse.julialang.org/t/plotlyjs-animation-errors-in-examples-https-juliaplots-github-io-examples-plotlyjs/2599 "2017-03-11T00:39:00Z")

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Almost all example from https://juliaplots.github.io/examples/plotlyjs/ runs well under Jupyter notebook (some as is, some after minor Julia/Pkg fixes due to version updates). But 3 errors I can’t easy fix: Animation …

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## [Plotly - network error at opening a window from REPL, Jupyter is fine](https://discourse.julialang.org/t/plotly-network-error-at-opening-a-window-from-repl-jupyter-is-fine/2598)

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**Author:** [@olegmikul](https://discourse.julialang.org/u/olegmikul)\
**Replies:** 0\
**Last updated:** [March 10, 2017, 7:52pm UTC](https://discourse.julialang.org/t/plotly-network-error-at-opening-a-window-from-repl-jupyter-is-fine/2598 "2017-03-10T19:52:34Z")

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I am a new in plotlyjs. Works in Jupyter notebook, but not from REPL. From REPL it is opening a standalone window, wait for a while, and then showing: \*\*Network Error (tcp\_error) \*\* A communication error occurred: “Ope…

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## [Julia implementations of some of the foundational Machine Learning models and algorithms from scratch](https://discourse.julialang.org/t/julia-implementations-of-some-of-the-foundational-machine-learning-models-and-algorithms-from-scratch/2586)

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**Author:** [@memoiry](https://discourse.julialang.org/u/memoiry)\
**Replies:** 0\
**Last updated:** [March 10, 2017, 4:47am UTC](https://discourse.julialang.org/t/julia-implementations-of-some-of-the-foundational-machine-learning-models-and-algorithms-from-scratch/2586 "2017-03-10T04:47:54Z")

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Hi I have written a project https://github.com/memoiry/lightML.jl including basic implementation of typical machine learning algorithms implemented in Julia. It’s a self-educational project so that the implementation is…

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## [Modeling large dense LP with jump](https://discourse.julialang.org/t/modeling-large-dense-lp-with-jump/2557)

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**Author:** [@Pierre-Louis\_Poirion](https://discourse.julialang.org/u/Pierre-Louis_Poirion)\
**Replies:** 1\
**Last updated:** [March 9, 2017, 10:29pm UTC](https://discourse.julialang.org/t/modeling-large-dense-lp-with-jump/2557 "2017-03-09T22:29:30Z")

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Hi I am solve large dense LP (10^5 variables almost all coeff are non-zero) with jump and cplex. Now i am modeling the problem with the matrix: @constraint(m, A\*x==b) But it takes some time to create the model. Is t…

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## [New to Optimization - Guidance](https://discourse.julialang.org/t/new-to-optimization-guidance/2527)

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**Author:** [@andrewg](https://discourse.julialang.org/u/andrewg)\
**Replies:** 5\
**Last updated:** [March 9, 2017, 9:49am UTC](https://discourse.julialang.org/t/new-to-optimization-guidance/2527 "2017-03-09T09:49:06Z")

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Hi, I’m trying to implement an algorithm from a paper\[1\] which includes a nonlinear optimization. I’ve never done any optimization before, aside from fitting curves with inverting matrices. I’m struggling to work out wh…

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## [Adding Shearlet transform package to JuliaDSP](https://discourse.julialang.org/t/adding-shearlet-transform-package-to-juliadsp/2498)

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**Author:** [@arsenal9971](https://discourse.julialang.org/u/arsenal9971)\
**Replies:** 2\
**Last updated:** [March 8, 2017, 10:59am UTC](https://discourse.julialang.org/t/adding-shearlet-transform-package-to-juliadsp/2498 "2017-03-08T10:59:11Z")

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Dear Julians and hopefully members of JuliaDSP organization, My name is Héctor Andrade Loarca and I am currently doing my PhD in mathematics specialized in Digital Signal Processing and Compressed Sensing, specially in …

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## [What name is viewing 3D movie package with time axis?](https://discourse.julialang.org/t/what-name-is-viewing-3d-movie-package-with-time-axis/2537)

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**Author:** [@programista](https://discourse.julialang.org/u/programista)\
**Replies:** 1\
**Last updated:** [March 8, 2017, 9:54am UTC](https://discourse.julialang.org/t/what-name-is-viewing-3d-movie-package-with-time-axis/2537 "2017-03-08T09:54:31Z")

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What name is viewing 3D movie package with time axis ? Thanks Paul

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## [GLVisualize and Julia 0.6?](https://discourse.julialang.org/t/glvisualize-and-julia-0-6/2515)

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**Author:** [@Benoit9](https://discourse.julialang.org/u/Benoit9)\
**Replies:** 3\
**Last updated:** [March 7, 2017, 7:56pm UTC](https://discourse.julialang.org/t/glvisualize-and-julia-0-6/2515 "2017-03-07T19:56:11Z")

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Hello, I am new to Julia, just installed the latest version (b53d6f2) on Ubuntu 16.04. I am using 0.6 instead of a stable release because CUDAnative seems to require it. Trying to Pkg.test(“GLVisualize”), I get lots of…

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## [Using Neural Network for regression (in Julia)](https://discourse.julialang.org/t/using-neural-network-for-regression-in-julia/2410)

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**Author:** [@Balinus](https://discourse.julialang.org/u/Balinus)\
**Replies:** 11\
**Last updated:** [March 6, 2017, 4:01pm UTC](https://discourse.julialang.org/t/using-neural-network-for-regression-in-julia/2410 "2017-03-06T16:01:03Z")

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Hello, I’d like to use Julia for a small ML project. My dataset is about 2000 samples and 142 features. I was hoping to use a simple Neural Network to do this task (with a ReLU neuron as the output node?). However, I j…

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## [Radon and iradon transforms](https://discourse.julialang.org/t/radon-and-iradon-transforms/2407)

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**Author:** [@yalexand](https://discourse.julialang.org/u/yalexand)\
**Replies:** 31\
**Last updated:** [March 6, 2017, 1:28pm UTC](https://discourse.julialang.org/t/radon-and-iradon-transforms/2407 "2017-03-06T13:28:06Z")

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Hi All, I am new to Julia, coming from Matlab, recently started working on OPT (Optical Projection Tomography) project where one of requirements is open source. I tried to implement something similar to Matlab radon/ir…

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