# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=568

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**Page:** 569

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## [Coordinates for nodes in LightGraphs.jl](https://discourse.julialang.org/t/coordinates-for-nodes-in-lightgraphs-jl/1868)

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**Author:** [@varun7rs](https://discourse.julialang.org/u/varun7rs)\
**Replies:** 1\
**Last updated:** [February 3, 2017, 3:30pm UTC](https://discourse.julialang.org/t/coordinates-for-nodes-in-lightgraphs-jl/1868 "2017-02-03T15:30:59Z")

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I am reading in an XML file to create a graph using LightGraphs package. I later intend to save the graph using TikzGraphs package. I would however want to know if there is a possibility to include additional node attrib…

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## [Convex optimisation over complex variables](https://discourse.julialang.org/t/convex-optimisation-over-complex-variables/1388)

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**Author:** [@Jedrek](https://discourse.julialang.org/u/Jedrek)\
**Replies:** 4\
**Last updated:** [February 3, 2017, 11:38am UTC](https://discourse.julialang.org/t/convex-optimisation-over-complex-variables/1388 "2017-02-03T11:38:51Z")

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Hello Everyone, I’ve just installed Julia and Convex.jl (package for convex optimisation) and things work fine as long as my variables are real, e.g. using Convex using SCS x = Variable() And then I can optimise. H…

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## [If there a getvariable() equivalent for expressions?](https://discourse.julialang.org/t/if-there-a-getvariable-equivalent-for-expressions/1857)

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**Author:** [@adowling2](https://discourse.julialang.org/u/adowling2)\
**Replies:** 2\
**Last updated:** [February 3, 2017, 12:56am UTC](https://discourse.julialang.org/t/if-there-a-getvariable-equivalent-for-expressions/1857 "2017-02-03T00:56:56Z")

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I like to build modular optimization models using functions. Occasionally, I will add a variable in one function and then bring it into scope in another function using getvariable(). Is there an equivalent feature for ex…

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## [ANN: CUTEst.jl v0.1.0](https://discourse.julialang.org/t/ann-cutest-jl-v0-1-0/1796)

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**Author:** [@abelsiqueira](https://discourse.julialang.org/u/abelsiqueira)\
**Replies:** 2\
**Last updated:** [February 2, 2017, 6:23pm UTC](https://discourse.julialang.org/t/ann-cutest-jl-v0-1-0/1796 "2017-02-02T18:23:03Z")

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Hello everyone, we’re happy to announce that CUTEst.jl has had its first release: v0.1.0. CUTEst is the third installment of the Constrained and Unconstrained Testing Environment for nonlinear optimization problems. Th…

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## [ANN: NLPModels.jl v0.1.0](https://discourse.julialang.org/t/ann-nlpmodels-jl-v0-1-0/1795)

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**Author:** [@abelsiqueira](https://discourse.julialang.org/u/abelsiqueira)\
**Replies:** 7\
**Last updated:** [February 2, 2017, 6:19pm UTC](https://discourse.julialang.org/t/ann-nlpmodels-jl-v0-1-0/1795 "2017-02-02T18:19:25Z")

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Hello everyone, we’re happy to announce NLPModels.jl v0.1.0, a package providing ways to create Nonlinear Programming Models with a standardized API. This allows the creation of algorithms that can rely on that API to a…

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## [Overview of Geo tools](https://discourse.julialang.org/t/overview-of-geo-tools/1844)

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**Author:** [@mkborregaard](https://discourse.julialang.org/u/mkborregaard)\
**Replies:** 2\
**Last updated:** [February 2, 2017, 6:18pm UTC](https://discourse.julialang.org/t/overview-of-geo-tools/1844 "2017-02-02T18:18:47Z")

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Hi, is it possible somewhere to find an overview of how to work with geographical data in Julia (i.e. the JuliaGeo organisation and allies), and what functionality is implemented? I cannot seem to find any documentation…

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## [How to obtain a Basic solution?](https://discourse.julialang.org/t/how-to-obtain-a-basic-solution/1784)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 8\
**Last updated:** [February 2, 2017, 6:14pm UTC](https://discourse.julialang.org/t/how-to-obtain-a-basic-solution/1784 "2017-02-02T18:14:16Z")

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Is there a way to guarantee that the solution returned by JuMP to a linear program is a basic solution? I know this is probably a responsability of the solver. Is there an option I can pass from JuMP to any solver that …

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## [Check Feasibility of Solution Returned by JuMP After Timeout](https://discourse.julialang.org/t/check-feasibility-of-solution-returned-by-jump-after-timeout/1477)

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**Author:** [@gdowdy3](https://discourse.julialang.org/u/gdowdy3)\
**Replies:** 3\
**Last updated:** [February 1, 2017, 11:16pm UTC](https://discourse.julialang.org/t/check-feasibility-of-solution-returned-by-jump-after-timeout/1477 "2017-02-01T23:16:13Z")

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I’ve got an integer programming problem which I’m solving with JuMP, using Cbc as the underlying solver. The full solution of the problem (i.e., finding a provably optimal solution) takes longer than I care to wait, so …

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## [DynamicalBilliards.jl : A Julia package for Dynamical Billiard systems in two dimensions](https://discourse.julialang.org/t/dynamicalbilliards-jl-a-julia-package-for-dynamical-billiard-systems-in-two-dimensions/1826)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 0\
**Last updated:** [February 1, 2017, 7:32pm UTC](https://discourse.julialang.org/t/dynamicalbilliards-jl-a-julia-package-for-dynamical-billiard-systems-in-two-dimensions/1826 "2017-02-01T19:32:21Z")

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DynamicalBilliards.jl is a Julia package written entirely in Julia, which simulates dynamical billiards systems. The current release version is fully usable and close to being complete! The package is easy-to-use, modul…

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## [A problem running JuMP under Atom Juno IDE](https://discourse.julialang.org/t/a-problem-running-jump-under-atom-juno-ide/1627)

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**Author:** [@Tal\_Raviv](https://discourse.julialang.org/u/Tal_Raviv)\
**Replies:** 1\
**Last updated:** [January 31, 2017, 8:20pm UTC](https://discourse.julialang.org/t/a-problem-running-jump-under-atom-juno-ide/1627 "2017-01-31T20:20:36Z")

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I am not sure that this is the right forum but I will try. I am using latest stable versions of Julia (0,5.0) and ATOM (1.13.0) with update JuMP and Clp packages. My OS is windows 64. The following simple two lines of c…

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## [CUDAnative: Using second and third dims in the kernel](https://discourse.julialang.org/t/cudanative-using-second-and-third-dims-in-the-kernel/1799)

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**Author:** [@Colin\_Beckingham](https://discourse.julialang.org/u/Colin_Beckingham)\
**Replies:** 2\
**Last updated:** [January 31, 2017, 3:58pm UTC](https://discourse.julialang.org/t/cudanative-using-second-and-third-dims-in-the-kernel/1799 "2017-01-31T15:58:38Z")

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In my attempts to generalize the example code given on the README.md I have had good results including processing arrays larger than the device blocksize, but have run into a block regarding the use of the second and thi…

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## [Is not having the LHS in some constraints in the LP problematic?](https://discourse.julialang.org/t/is-not-having-the-lhs-in-some-constraints-in-the-lp-problematic/1756)

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**Author:** [@varun7rs](https://discourse.julialang.org/u/varun7rs)\
**Replies:** 2\
**Last updated:** [January 31, 2017, 1:25pm UTC](https://discourse.julialang.org/t/is-not-having-the-lhs-in-some-constraints-in-the-lp-problematic/1756 "2017-01-31T13:25:31Z")

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Hello, I’ve been using JuMP for my computations and its one of the best experiences I’ve had with a mathematical programming language. I recently ran into a problem solving one of my models. It turns out that the soluti…

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## [Training LSTM in MXNet.jl with differing input and output?](https://discourse.julialang.org/t/training-lstm-in-mxnet-jl-with-differing-input-and-output/1707)

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**Author:** [@TravisA9](https://discourse.julialang.org/u/TravisA9)\
**Replies:** 2\
**Last updated:** [January 30, 2017, 4:49pm UTC](https://discourse.julialang.org/t/training-lstm-in-mxnet-jl-with-differing-input-and-output/1707 "2017-01-30T16:49:35Z")

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Sorry guys, I am new to this and don’t have good access to any courses or good books on the subject. My question could probably best be illustrated with a translator… the expected output would be quite different from the…

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## [Which optimization API/Pkg for simple global optimization](https://discourse.julialang.org/t/which-optimization-api-pkg-for-simple-global-optimization/1708)

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**Author:** [@jtravs](https://discourse.julialang.org/u/jtravs)\
**Replies:** 8\
**Last updated:** [January 29, 2017, 1:26pm UTC](https://discourse.julialang.org/t/which-optimization-api-pkg-for-simple-global-optimization/1708 "2017-01-29T13:26:36Z")

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Hi, in a laser physics experiment I am building I need to optimize the positions of 4 actuators on some mirrors; these positions are simply controlled by 4 numbers. The optimization needs to be done to maximize a set of …

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## [Error installing CUDAnative on v0.6 : Resolved](https://discourse.julialang.org/t/error-installing-cudanative-on-v0-6-resolved/1743)

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**Author:** [@Colin\_Beckingham](https://discourse.julialang.org/u/Colin_Beckingham)\
**Replies:** 7\
**Last updated:** [January 29, 2017, 10:16am UTC](https://discourse.julialang.org/t/error-installing-cudanative-on-v0-6-resolved/1743 "2017-01-29T10:16:06Z")

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I have installed a small GEForce GT-610 in my box and in BIOS directed the video output to the IGFX which hopefully leaves the CUDA card free for processing numbers. I had a problem getting CUDAnative,jl installed and w…

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## [Queries regarding Symbolic API in MXNet in Julia](https://discourse.julialang.org/t/queries-regarding-symbolic-api-in-mxnet-in-julia/1753)

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**Author:** [@kishoreabhishek](https://discourse.julialang.org/u/kishoreabhishek)\
**Replies:** 1\
**Last updated:** [January 29, 2017, 9:30am UTC](https://discourse.julialang.org/t/queries-regarding-symbolic-api-in-mxnet-in-julia/1753 "2017-01-29T09:30:40Z")

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I am struggling to understand the symbolic API nuances of MXNet in Julia. I saw an example in MXNet documentation which has the following line: act1 = mx.Activation(data = fc1, name=:relu1, act\_type=:relu) Why is act\_ty…

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## [Number of nonlinear constraints in a JuMP model?](https://discourse.julialang.org/t/number-of-nonlinear-constraints-in-a-jump-model/1744)

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**Author:** [@ccoffrin](https://discourse.julialang.org/u/ccoffrin)\
**Replies:** 1\
**Last updated:** [January 28, 2017, 7:37pm UTC](https://discourse.julialang.org/t/number-of-nonlinear-constraints-in-a-jump-model/1744 "2017-01-28T19:37:37Z")

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In JuMP, what’s the function analogous to MathProgBase.numlinconstr(model) for getting the number of nonlinear constraints?

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## [Inequality (fairness measures) in Julia](https://discourse.julialang.org/t/inequality-fairness-measures-in-julia/1732)

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**Author:** [@gavelasq](https://discourse.julialang.org/u/gavelasq)\
**Replies:** 6\
**Last updated:** [January 27, 2017, 11:27pm UTC](https://discourse.julialang.org/t/inequality-fairness-measures-in-julia/1732 "2017-01-27T23:27:03Z")

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Is there a Julia package that calculates inequality measures like Gini Index, Theil Index, Atkinson Index, Hoover Index?

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## [Assigning different markers to series](https://discourse.julialang.org/t/assigning-different-markers-to-series/1725)

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**Author:** [@purplishrock](https://discourse.julialang.org/u/purplishrock)\
**Replies:** 4\
**Last updated:** [January 28, 2017, 4:20am UTC](https://discourse.julialang.org/t/assigning-different-markers-to-series/1725 "2017-01-28T04:20:29Z")

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I have something like plot(plot(\[\[1:m:length(yint)\], \[1:length(yint)\]\], \[real(s), real(yint)\]), plot(\[\[1:m:length(yint)\], \[1:length(yint)\]\], \[imag(s), imag(yint)\]), markershape=:circle, layout…

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## [eigvals!(A) vs eigvals!(A, B)?](https://discourse.julialang.org/t/eigvals-a-vs-eigvals-a-b/1734)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 1\
**Last updated:** [January 27, 2017, 11:41pm UTC](https://discourse.julialang.org/t/eigvals-a-vs-eigvals-a-b/1734 "2017-01-27T23:41:16Z")

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What is the difference between eigvals!(A) and eigvals!(A,B)? I understand that eigvals!(A) will replace A with a “scaled” version, where rows and columns are more equal in norm and the matrix becomes closer to upper tr…

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## [Analytically take the derivtive of a matrix for use with JuMP variables](https://discourse.julialang.org/t/analytically-take-the-derivtive-of-a-matrix-for-use-with-jump-variables/1711)

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**Author:** [@huckl3b3rry87](https://discourse.julialang.org/u/huckl3b3rry87)\
**Replies:** 4\
**Last updated:** [January 27, 2017, 4:10am UTC](https://discourse.julialang.org/t/analytically-take-the-derivtive-of-a-matrix-for-use-with-jump-variables/1711 "2017-01-27T04:10:43Z")

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I am solving optimal control problems where I need to calculate the D or differentiation matrix, it is full of derivartives of Lagrange Polynomials . This matrix is also a function of the final time (tf, which is a desi…

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## [Stuck on BAMWriter](https://discourse.julialang.org/t/stuck-on-bamwriter/1671)

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**Author:** [@amckay1](https://discourse.julialang.org/u/amckay1)\
**Replies:** 4\
**Last updated:** [January 25, 2017, 4:52pm UTC](https://discourse.julialang.org/t/stuck-on-bamwriter/1671 "2017-01-25T16:52:57Z")

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Looking for example code for wrapping with BGZFStream

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## [Unified Interface for Linear Solving](https://discourse.julialang.org/t/unified-interface-for-linear-solving/699)

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**Author:** [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Replies:** 34\
**Last updated:** [January 25, 2017, 3:04am UTC](https://discourse.julialang.org/t/unified-interface-for-linear-solving/699 "2017-01-25T03:04:50Z")

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Building off of the rootfinding topic, I would like to propose some common interface for linear solving in Julia for the same reasons: allowing packages which use linear solvers to easy “swap out methods”. While \\ is nic…

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## [UncertaintySets in JuMPeR](https://discourse.julialang.org/t/uncertaintysets-in-jumper/1675)

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**Author:** [@gavelasq](https://discourse.julialang.org/u/gavelasq)\
**Replies:** 0\
**Last updated:** [January 25, 2017, 2:31am UTC](https://discourse.julialang.org/t/uncertaintysets-in-jumper/1675 "2017-01-25T02:31:50Z")

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Has anyone coded the delta formulation proposed by Lavania Marla in her Dissertation “Robust optimization for network-based resource allocation problems under uncertainty” or any other special uncertainty sets?

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## [Any Julia deep learning frameworks use automatic differentiation?](https://discourse.julialang.org/t/any-julia-deep-learning-frameworks-use-automatic-differentiation/1596)

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**Author:** [@Phil\_Tomson](https://discourse.julialang.org/u/Phil_Tomson)\
**Replies:** 10\
**Last updated:** [January 24, 2017, 9:06pm UTC](https://discourse.julialang.org/t/any-julia-deep-learning-frameworks-use-automatic-differentiation/1596 "2017-01-24T21:06:48Z")

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Do any of the current Julia-based deep-learning frameworks use automatic differentiation? I’m pretty sure Mocha.jl does not. MXNET.jl seems to, but it actually is just a wrapper around the mxnet C++ code (so the AD is ta…

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## [Create quadratic objective will @objective and @NLobjective lead to different solution using Ipopt](https://discourse.julialang.org/t/create-quadratic-objective-will-objective-and-nlobjective-lead-to-different-solution-using-ipopt/1666)

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**Author:** [@Yankai\_Cao](https://discourse.julialang.org/u/Yankai_Cao)\
**Replies:** 1\
**Last updated:** [January 24, 2017, 7:35pm UTC](https://discourse.julialang.org/t/create-quadratic-objective-will-objective-and-nlobjective-lead-to-different-solution-using-ipopt/1666 "2017-01-24T19:35:46Z")

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We can create quadratic objective with either @objective or @NLobjective. The following is an example created with @NLobjective, and I get the objective value -17. However, when I changed @NLobjective to @objective and r…

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## [How to compute neighbour network using NearestNeighbors.jl](https://discourse.julialang.org/t/how-to-compute-neighbour-network-using-nearestneighbors-jl/1644)

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**Author:** [@pablosanjose](https://discourse.julialang.org/u/pablosanjose)\
**Replies:** 4\
**Last updated:** [January 23, 2017, 8:17am UTC](https://discourse.julialang.org/t/how-to-compute-neighbour-network-using-nearestneighbors-jl/1644 "2017-01-23T08:17:55Z")

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Using NearestNeighbor.jl I can find which points within a collection col are closest to a (different) given point or set of points. What I need is slightly different. I would like to compute the points p\_i in col that ar…

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## [ANN: Espresso.jl - an expression transformation package](https://discourse.julialang.org/t/ann-espresso-jl-an-expression-transformation-package/1641)

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**Author:** [@dfdx](https://discourse.julialang.org/u/dfdx)\
**Replies:** 1\
**Last updated:** [January 22, 2017, 7:49pm UTC](https://discourse.julialang.org/t/ann-espresso-jl-an-expression-transformation-package/1641 "2017-01-22T19:49:34Z")

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Espresso.jl is a new package for expression matching and transformation. A few functions that might be intersting for people working with Julia AST: matchex - match expression by pattern, extract matching elements; s…

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## [JuMP slow model generation](https://discourse.julialang.org/t/jump-slow-model-generation/1623)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 1\
**Last updated:** [January 20, 2017, 10:29pm UTC](https://discourse.julialang.org/t/jump-slow-model-generation/1623 "2017-01-20T22:29:19Z")

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I am constructing large LP model with JuMP, that I want to solve using Gurobi. I get the following warning: WARNING: The addition operator has been used on JuMP expressions a large number of times. This warning is saf…

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## [Plotting options for DataFrames with NullableArray](https://discourse.julialang.org/t/plotting-options-for-dataframes-with-nullablearray/1584)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 9\
**Last updated:** [January 20, 2017, 8:08pm UTC](https://discourse.julialang.org/t/plotting-options-for-dataframes-with-nullablearray/1584 "2017-01-20T20:08:26Z")

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I have been transitioning to Nullables in my data analysis code, then belatedly realized that neither Gadfly nor Plots.jl work with current master DataFrames. Is there a plotting package that is usable at the moment? ht…

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