# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=534

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**Page:** 535

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## [Table of Automatic Differentiation Examples](https://discourse.julialang.org/t/table-of-automatic-differentiation-examples/11760)

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**Author:** [@barak](https://discourse.julialang.org/u/barak)\
**Replies:** 0\
**Last updated:** [June 18, 2018, 3:44pm UTC](https://discourse.julialang.org/t/table-of-automatic-differentiation-examples/11760 "2018-06-18T15:44:18Z")

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We are maintaining a table of AD examples in a variety of languages. There are five example programs, with varying levels of dynamic behaviour and amounts of nesting of AD operators. This has a number of uses. One is ben…

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## [NRLMSISE-00 Atmospheric Model is now available in SatelliteToolbox.jl](https://discourse.julialang.org/t/nrlmsise-00-atmospheric-model-is-now-available-in-satellitetoolbox-jl/11667)

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**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 2\
**Last updated:** [June 16, 2018, 1:36am UTC](https://discourse.julialang.org/t/nrlmsise-00-atmospheric-model-is-now-available-in-satellitetoolbox-jl/11667 "2018-06-16T01:36:39Z")

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Hi guys! The master branch of SatelliteToolbox.jl has now the atmospheric model NRLMSISE-00. I need this because it will be integrated into the numerical orbit propagator that I am coding. However, since I am no expert …

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## [Mapping ThreadIdx().x to a 5D array?](https://discourse.julialang.org/t/mapping-threadidx-x-to-a-5d-array/11693)

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**Author:** [@floswald](https://discourse.julialang.org/u/floswald)\
**Replies:** 8\
**Last updated:** [June 15, 2018, 5:59pm UTC](https://discourse.julialang.org/t/mapping-threadidx-x-to-a-5d-array/11693 "2018-06-15T17:59:10Z")

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I have the following big picture aim. Suppose I have a high dimensional array, e.g. 5D or 6D. On each index of those arrays, an independent computation delivers a different value that needs to be stored at this index. Fo…

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## [Streaming data as images/video over the web](https://discourse.julialang.org/t/streaming-data-as-images-video-over-the-web/11690)

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**Author:** [@Raf](https://discourse.julialang.org/u/Raf)\
**Replies:** 3\
**Last updated:** [June 15, 2018, 11:16am UTC](https://discourse.julialang.org/t/streaming-data-as-images-video-over-the-web/11690 "2018-06-15T11:16:38Z")

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Say I have a 800\*800 Matrix that is updated a few times a second, and can be represented as a raster image. What is the simplest way of streaming that over the web? We are looking to build a web client to explore our s…

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## [Finding new packages and docs](https://discourse.julialang.org/t/finding-new-packages-and-docs/10417)

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**Author:** [@phaverty](https://discourse.julialang.org/u/phaverty)\
**Replies:** 11\
**Last updated:** [June 14, 2018, 3:52pm UTC](https://discourse.julialang.org/t/finding-new-packages-and-docs/10417 "2018-06-14T15:52:19Z")

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It looks like the Bio.jl documentation and such is moving from BioJulia · GitHub to https://biojulia.net/. I that right? Some cross-links and explanation would be very helpful. The “not for use with Julia 0.6” warning o…

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## [Convolution quadrature](https://discourse.julialang.org/t/convolution-quadrature/11656)

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**Author:** [@DNF](https://discourse.julialang.org/u/DNF)\
**Replies:** 11\
**Last updated:** [June 14, 2018, 12:12am UTC](https://discourse.julialang.org/t/convolution-quadrature/11656 "2018-06-14T00:12:05Z")

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I am looking to perform convolution quadrature, but cannot seem to find any ready-made solution. HCubature.jl and QuadGK.jl seem very capable for ordinary quadrature, but I cannot find any resources for convolution. To …

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## [CPLEX - Accessing root node before and after cuts](https://discourse.julialang.org/t/cplex-accessing-root-node-before-and-after-cuts/11650)

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**Author:** [@Lefteris\_Manousakis](https://discourse.julialang.org/u/Lefteris_Manousakis)\
**Replies:** 1\
**Last updated:** [June 13, 2018, 8:25pm UTC](https://discourse.julialang.org/t/cplex-accessing-root-node-before-and-after-cuts/11650 "2018-06-13T20:25:58Z")

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Hi! Is there a way to access the value of the root node relaxation of cplex before and after applying the cuts? I would like to measure the effectiveness of cuts at root 0 and how much they can tighten the formulation. T…

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## [Gradiens of gradients using ReverseDiff](https://discourse.julialang.org/t/gradiens-of-gradients-using-reversediff/11661)

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**Author:** [@Goysa2](https://discourse.julialang.org/u/Goysa2)\
**Replies:** 0\
**Last updated:** [June 13, 2018, 7:42pm UTC](https://discourse.julialang.org/t/gradiens-of-gradients-using-reversediff/11661 "2018-06-13T19:42:56Z")

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Hi, This is a duplicate of the issue I created here: https://github.com/JuliaDiff/ReverseDiff.jl/issues/105 I am trying to get Hessian-vector product, without having to explicitly compute the Hessian matrix. I have t…

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## [ReverseDiff resultst do not fit theory](https://discourse.julialang.org/t/reversediff-resultst-do-not-fit-theory/11549)

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**Author:** [@Goysa2](https://discourse.julialang.org/u/Goysa2)\
**Replies:** 6\
**Last updated:** [June 8, 2018, 9:21pm UTC](https://discourse.julialang.org/t/reversediff-resultst-do-not-fit-theory/11549 "2018-06-08T21:21:24Z")

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I have a question concerning ReverseDiff. I am doing some simple benchmarking with different Julia tools for automatic differentiation. In theory (at least what I know of automatic differentiation theory) computing a gra…

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## [Plot problem](https://discourse.julialang.org/t/plot-problem/11586)

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**Author:** [@jcrbloch](https://discourse.julialang.org/u/jcrbloch)\
**Replies:** 5\
**Last updated:** [June 13, 2018, 2:22pm UTC](https://discourse.julialang.org/t/plot-problem/11586 "2018-06-13T14:22:38Z")

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Many of my plots are cut off at the top. For example: pyplot() plot(xlabel=“s”,ylabel=“Re(f)”) plot!(T.s1,T.f1,color=:blue) plot!(T.s2,T.f2,color=:blue) f\_w%3D10|600x450

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## [Table transformation in JuliaDB or Queryverse or DataFramesMeta?](https://discourse.julialang.org/t/table-transformation-in-juliadb-or-queryverse-or-dataframesmeta/11622)

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**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 5\
**Last updated:** [June 13, 2018, 1:47pm UTC](https://discourse.julialang.org/t/table-transformation-in-juliadb-or-queryverse-or-dataframesmeta/11622 "2018-06-13T13:47:34Z")

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I have been experimenting with different NLopt optimizers on particular examples of models from MixedModels. The current set of results is available at https://github.com/dmbates/MixedModelExamples/blob/master/results/…

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## [Strange behaviour of @cuprintf?](https://discourse.julialang.org/t/strange-behaviour-of-cuprintf/11635)

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**Author:** [@floswald](https://discourse.julialang.org/u/floswald)\
**Replies:** 3\
**Last updated:** [June 13, 2018, 12:34pm UTC](https://discourse.julialang.org/t/strange-behaviour-of-cuprintf/11635 "2018-06-13T12:34:24Z")

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I modified the example from the CUDAnative readme as follows. Am I using @cuprintf in the wrong way? function kernel\_vadd(a, b, c) i = (blockIdx().x-1) \* blockDim().x + threadIdx().x @cuprintf("blockx= %d, block…

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## [Problem with CUDAintrinsic pow: pow(y\[1,1\],2.0)?](https://discourse.julialang.org/t/problem-with-cudaintrinsic-pow-pow-y-1-1-2-0/11637)

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**Author:** [@floswald](https://discourse.julialang.org/u/floswald)\
**Replies:** 2\
**Last updated:** [June 13, 2018, 12:14pm UTC](https://discourse.julialang.org/t/problem-with-cudaintrinsic-pow-pow-y-1-1-2-0/11637 "2018-06-13T12:14:16Z")

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Hi again, (sorry for all the questions!) I am a bit puzzled that this does not work. I want to use the power function on values in a Matrix. if I uncomment x=1.0, it does work. function kernel(ydepK::CuDeviceMatrix{Fl…

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## [Beta Distribution - full precision may not have been achieved](https://discourse.julialang.org/t/beta-distribution-full-precision-may-not-have-been-achieved/11621)

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**Author:** [@acunningham](https://discourse.julialang.org/u/acunningham)\
**Replies:** 7\
**Last updated:** [June 13, 2018, 10:32am UTC](https://discourse.julialang.org/t/beta-distribution-full-precision-may-not-have-been-achieved/11621 "2018-06-13T10:32:29Z")

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Hi, I’m upgrading my code to use Julia 0.6 and all of the libraries along with and working through the code to fix any deprecation warnings / errors. However, since I update the Distributions library (v0.15.0) I seem t…

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## [Ipopt infeasibility on travis-ci](https://discourse.julialang.org/t/ipopt-infeasibility-on-travis-ci/11612)

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**Author:** [@Libbum](https://discourse.julialang.org/u/Libbum)\
**Replies:** 2\
**Last updated:** [June 13, 2018, 7:55am UTC](https://discourse.julialang.org/t/ipopt-infeasibility-on-travis-ci/11612 "2018-06-13T07:55:09Z")

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Hi everyone. I’m trying to set up tests for a project on Travis which uses JuMP with the Ipopt solver (repo for the project is here). The build steps seem fine as far as I can tell and my tests can run (well, sometimes…

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## [Solving a quadratic program inside a JuMP model solve](https://discourse.julialang.org/t/solving-a-quadratic-program-inside-a-jump-model-solve/10690)

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**Author:** [@shoshievass](https://discourse.julialang.org/u/shoshievass)\
**Replies:** 14\
**Last updated:** [June 13, 2018, 3:06am UTC](https://discourse.julialang.org/t/solving-a-quadratic-program-inside-a-jump-model-solve/10690 "2018-06-13T03:06:37Z")

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I’m trying to solve a two-step optimization problem (to fit a complex econometric model) that requires solving a \[fairly straight forward\] quadratic program (as a function of the parameters of the model) at every iterati…

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## [Using DataFramesMeta and Lazy in a function](https://discourse.julialang.org/t/using-dataframesmeta-and-lazy-in-a-function/11616)

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**Author:** [@pdeffebach](https://discourse.julialang.org/u/pdeffebach)\
**Replies:** 0\
**Last updated:** [June 12, 2018, 6:09pm UTC](https://discourse.julialang.org/t/using-dataframesmeta-and-lazy-in-a-function/11616 "2018-06-12T18:09:46Z")

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I’m working with dplyr today and ran into something that annoys me often. If I have a number of operations to do in repeatedly on a dataframe, its useful to put them in a function. However because of R’s lazy evaluation…

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## [Tensor regression models in Julia](https://discourse.julialang.org/t/tensor-regression-models-in-julia/11601)

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**Author:** [@outlace](https://discourse.julialang.org/u/outlace)\
**Replies:** 5\
**Last updated:** [June 12, 2018, 6:21pm UTC](https://discourse.julialang.org/t/tensor-regression-models-in-julia/11601 "2018-06-12T18:21:27Z")

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I’m trying to create a tensor regression model in Julia. I first tried in PyTorch but it was becoming a hassle so thought I’d give Julia a try, and its looking like Julia can’t do it at all (at least in any efficient way…

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## [Random subsample from a JuliaDB distributed table: no getindex](https://discourse.julialang.org/t/random-subsample-from-a-juliadb-distributed-table-no-getindex/11615)

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**Author:** [@ElOceanografo](https://discourse.julialang.org/u/ElOceanografo)\
**Replies:** 0\
**Last updated:** [June 12, 2018, 5:57pm UTC](https://discourse.julialang.org/t/random-subsample-from-a-juliadb-distributed-table-no-getindex/11615 "2018-06-12T17:57:27Z")

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I have a dataset in a JuliaDB distributed table with about 200 million rows. I’d like to take a random subsample from this table to do some quick exploratory plotting and analysis before running the whole thing. This i…

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## [Plot problem](https://discourse.julialang.org/t/plot-problem/11585)

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**Author:** [@jcrbloch](https://discourse.julialang.org/u/jcrbloch)\
**Replies:** 11\
**Last updated:** [June 12, 2018, 4:42pm UTC](https://discourse.julialang.org/t/plot-problem/11585 "2018-06-12T16:42:07Z")

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Many of my plots are cut off at the top. The commands are plot(xlabel="s",ylabel="Re(f)") plot!(T.s1,T.f1,color=:blue) plot!(T.s2,T.f2,color=:blue)

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## [Offset in scientific notation](https://discourse.julialang.org/t/offset-in-scientific-notation/11613)

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**Author:** [@jcrbloch](https://discourse.julialang.org/u/jcrbloch)\
**Replies:** 0\
**Last updated:** [June 12, 2018, 3:59pm UTC](https://discourse.julialang.org/t/offset-in-scientific-notation/11613 "2018-06-12T15:59:58Z")

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Is there a way to specify an offset in the scientific notation of ticks in a plot using Plots and pyplot()? In matplotlib one can do it by giving the useoffset argument in the ticklabel formatting This is quite useful w…

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## [Julia equivalent of cupy?](https://discourse.julialang.org/t/julia-equivalent-of-cupy/11603)

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**Author:** [@Kaiyin\_Zhong](https://discourse.julialang.org/u/Kaiyin_Zhong)\
**Replies:** 1\
**Last updated:** [June 12, 2018, 12:03pm UTC](https://discourse.julialang.org/t/julia-equivalent-of-cupy/11603 "2018-06-12T12:03:12Z")

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Do we have something like this?

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## [Publication with Julia/JuMP/Spectra: Thanks Julia Ecosystem](https://discourse.julialang.org/t/publication-with-julia-jump-spectra-thanks-julia-ecosystem/2961)

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**Author:** [@charlesll](https://discourse.julialang.org/u/charlesll)\
**Replies:** 3\
**Last updated:** [June 11, 2018, 11:03pm UTC](https://discourse.julialang.org/t/publication-with-julia-jump-spectra-thanks-julia-ecosystem/2961 "2018-06-11T23:03:38Z")

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Dear Julia Opt community, I just wanted to share my enthusiasm about one of our new publication in Journal of Non Crystalline Solids (click here for a free version until 8th May or here for the standard Elsevier access)…

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## [Distributions 0.7 RangeGeneratorInt not defined](https://discourse.julialang.org/t/distributions-0-7-rangegeneratorint-not-defined/11577)

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**Author:** [@TAJD](https://discourse.julialang.org/u/TAJD)\
**Replies:** 4\
**Last updated:** [June 11, 2018, 12:33pm UTC](https://discourse.julialang.org/t/distributions-0-7-rangegeneratorint-not-defined/11577 "2018-06-11T12:33:56Z")

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Hi, I’m updating my work to use Julia 0.7 and I come up with this error. I see there have been a few issues raised on the repo for updating Distributions to work with 0.7. What is the current status of Distributions and …

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## [Zoomable plots in IJulia](https://discourse.julialang.org/t/zoomable-plots-in-ijulia/11523)

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**Author:** [@magzpavz](https://discourse.julialang.org/u/magzpavz)\
**Replies:** 3\
**Last updated:** [June 10, 2018, 11:12pm UTC](https://discourse.julialang.org/t/zoomable-plots-in-ijulia/11523 "2018-06-10T23:12:27Z")

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I’ve been using PyPlot for my plotting needs. How can I get interactive (mostly just adjusting axis limits) inline plots in an IJulia notebook? Interact.jl seems like overkill. Thanks!

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## [Graphs, k-centers and recursion](https://discourse.julialang.org/t/graphs-k-centers-and-recursion/11556)

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**Author:** [@JakobPeterlin](https://discourse.julialang.org/u/JakobPeterlin)\
**Replies:** 6\
**Last updated:** [June 10, 2018, 1:19pm UTC](https://discourse.julialang.org/t/graphs-k-centers-and-recursion/11556 "2018-06-10T13:19:21Z")

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Hello! I have been recently trying to improve the performance of the classic brute force algorithm for k-centers in a simple graph. My reasons for this are not really that serious, I was only trying to reach the speed o…

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## [Creating a collection of ordered tuple](https://discourse.julialang.org/t/creating-a-collection-of-ordered-tuple/11507)

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**Author:** [@Sharabh\_Shukla](https://discourse.julialang.org/u/Sharabh_Shukla)\
**Replies:** 1\
**Last updated:** [June 9, 2018, 9:46pm UTC](https://discourse.julialang.org/t/creating-a-collection-of-ordered-tuple/11507 "2018-06-09T21:46:53Z")

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Hi All, I am relatively new to Julia, moving from GAMS and AMPL. I am building a JuMP mode, for Distribution Optimal power Flow. The grid is mostly radial, so I am thinking of creating a collection of order tuples (bra…

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## [Right syntax @constraintref](https://discourse.julialang.org/t/right-syntax-constraintref/11529)

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**Author:** [@jayce\_ram](https://discourse.julialang.org/u/jayce_ram)\
**Replies:** 3\
**Last updated:** [June 8, 2018, 12:38pm UTC](https://discourse.julialang.org/t/right-syntax-constraintref/11529 "2018-06-08T12:38:26Z")

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I have read the documentation http://www.juliaopt.org/JuMP.jl/0.18/refexpr.html in order to get the right syntax to build a reference to a constraint. It’s like that: @constraintref constraintName\[1:3\] My constraint …

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## [LP having unbouded and bounded variables](https://discourse.julialang.org/t/lp-having-unbouded-and-bounded-variables/11494)

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**Author:** [@jayce\_ram](https://discourse.julialang.org/u/jayce_ram)\
**Replies:** 3\
**Last updated:** [June 8, 2018, 7:44am UTC](https://discourse.julialang.org/t/lp-having-unbouded-and-bounded-variables/11494 "2018-06-08T07:44:18Z")

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I have been modelling a LP problem with ~ 50k variables. Some of them are bounded, the other ones can take any value, i.e., they are unbounded. I coded the objective function and constraints but at the end, I got this r…

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## [Stack hierarchical data](https://discourse.julialang.org/t/stack-hierarchical-data/11522)

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**Author:** [@pmarg](https://discourse.julialang.org/u/pmarg)\
**Replies:** 0\
**Last updated:** [June 7, 2018, 9:54pm UTC](https://discourse.julialang.org/t/stack-hierarchical-data/11522 "2018-06-07T21:54:28Z")

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Hi, I have some survey data which are organized hierarchically and I would like to transform them into a rectangular dataset. For example using JuliaDB: t = table(\[1,1,1,2,2,2\], \[1,2,2,2,4,5\],\[10,20,10,5,20,10\], names=…

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