# Specific Domains

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

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**Page:** 566

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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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## [Staffjoy Scheduling Algorithm in Julia, Now Open Source](https://discourse.julialang.org/t/staffjoy-scheduling-algorithm-in-julia-now-open-source/2468)

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**Author:** [@philipithomas](https://discourse.julialang.org/u/philipithomas)\
**Replies:** 0\
**Last updated:** [March 5, 2017, 6:57am UTC](https://discourse.julialang.org/t/staffjoy-scheduling-algorithm-in-julia-now-open-source/2468 "2017-03-05T06:57:54Z")

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Hi all - about three years ago, I discovered Julia and the JuliaOpt community, which rekindled an interest in applying optimization mathematics to workforce scheduling problems. Previously, I had worked on such problems …

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## [My Julia videos on YouTube](https://discourse.julialang.org/t/my-julia-videos-on-youtube/2437)

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**Author:** [@parthasarathy\_gangul](https://discourse.julialang.org/u/parthasarathy_gangul)\
**Replies:** 0\
**Last updated:** [March 4, 2017, 12:17pm UTC](https://discourse.julialang.org/t/my-julia-videos-on-youtube/2437 "2017-03-04T12:17:46Z")

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See my videos on Julia on YouTube. Feel free to contribute. Here is the link: Parthasarathy Ganguly

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## [Flux: Machine Learning with Julia](https://discourse.julialang.org/t/flux-machine-learning-with-julia/2382)

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**Author:** [@MikeInnes](https://discourse.julialang.org/u/MikeInnes)\
**Replies:** 8\
**Last updated:** [March 3, 2017, 5:58pm UTC](https://discourse.julialang.org/t/flux-machine-learning-with-julia/2382 "2017-03-03T17:58:23Z")

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I’m pleased to announce the early alpha release of Flux, a Julia interface for machine learning. Flux gives you the best of both worlds. Like Knet or PyTorch, Flux code is easy to reason about; it behaves like Julia, yo…

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## [solvePnP in JuMP (Pose Estimation)](https://discourse.julialang.org/t/solvepnp-in-jump-pose-estimation/2408)

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**Author:** [@TsurHerman](https://discourse.julialang.org/u/TsurHerman)\
**Replies:** 3\
**Last updated:** [March 3, 2017, 3:18pm UTC](https://discourse.julialang.org/t/solvepnp-in-jump-pose-estimation/2408 "2017-03-03T15:18:08Z")

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first steps in JuMP How can I solve the PnP problem using JuMP? I have a set of labeled 2d points with the corresponding 3d points. The camera matrix K is known. For any given R(3-element unit quaternion representing…

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## [Glvisualize view method being overwritten](https://discourse.julialang.org/t/glvisualize-view-method-being-overwritten/2324)

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**Author:** [@purplishrock](https://discourse.julialang.org/u/purplishrock)\
**Replies:** 4\
**Last updated:** [March 3, 2017, 4:08am UTC](https://discourse.julialang.org/t/glvisualize-view-method-being-overwritten/2324 "2017-03-03T04:08:47Z")

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Installation of the package went smoothly, so I think that it’s installed correctly. I tried running the sinfun example, using include(“sinfun.jl”) while in the repl, for glvisualize and it get the following error: WAR…

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## [Read cplex .sol and match to JUmP variables](https://discourse.julialang.org/t/read-cplex-sol-and-match-to-jump-variables/2388)

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**Author:** [@sshrabah](https://discourse.julialang.org/u/sshrabah)\
**Replies:** 0\
**Last updated:** [March 1, 2017, 4:45pm UTC](https://discourse.julialang.org/t/read-cplex-sol-and-match-to-jump-variables/2388 "2017-03-01T16:45:54Z")

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I am using the writeLP to export my jump model. I import generated .lp file in a remote cplex, then i export the solution the a .sol file. is there function to read and match the variable to JUmP’s exp readSol(file.so…

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## [How to create a JuMP constraint with coeffs and rhs?](https://discourse.julialang.org/t/how-to-create-a-jump-constraint-with-coeffs-and-rhs/2328)

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**Author:** [@bbrunaud](https://discourse.julialang.org/u/bbrunaud)\
**Replies:** 2\
**Last updated:** [March 1, 2017, 6:12am UTC](https://discourse.julialang.org/t/how-to-create-a-jump-constraint-with-coeffs-and-rhs/2328 "2017-03-01T06:12:20Z")

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Hello. I’m trying to run an algorithm generating Gomory cuts. I managed to get the right tableau row. Now I would like to add the cut to the JuMP model having a vector of indices, coeffs, sense and rhs. So far I could o…

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## [Reading binary files in pieces](https://discourse.julialang.org/t/reading-binary-files-in-pieces/2375)

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**Author:** [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Replies:** 1\
**Last updated:** [February 28, 2017, 10:29pm UTC](https://discourse.julialang.org/t/reading-binary-files-in-pieces/2375 "2017-02-28T22:29:35Z")

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Hello all. I suspect the following problem is very simple from a programming perspective, but unfortunately I have so little experience with serialization/deserialization code that I’m a bit baffled about where to start…

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## [Calculating Sparse Jacobians with Autodifferentiation](https://discourse.julialang.org/t/calculating-sparse-jacobians-with-autodifferentiation/2313)

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**Author:** [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Replies:** 8\
**Last updated:** [February 28, 2017, 3:08am UTC](https://discourse.julialang.org/t/calculating-sparse-jacobians-with-autodifferentiation/2313 "2017-02-28T03:08:24Z")

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Is there a way with any of the autodifferentiation tools to specify a sprasity pattern or bandedness for the Jacobian? This is something which would be incredibly useful for the differential equation solvers, but I don’t…

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## [Broken BLAS.gemm with complex rectangular matrix](https://discourse.julialang.org/t/broken-blas-gemm-with-complex-rectangular-matrix/2247)

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**Author:** [@dcyang](https://discourse.julialang.org/u/dcyang)\
**Replies:** 5\
**Last updated:** [February 27, 2017, 2:49am UTC](https://discourse.julialang.org/t/broken-blas-gemm-with-complex-rectangular-matrix/2247 "2017-02-27T02:49:45Z")

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Hi, I ran the following short code on two different versions of Julia and got results that are broken in different ways. import Base.LinAlg.BLAS.gemm A = convert(Array{Complex64,2}, \[-6im -5im; -4 3; 2im im\]) println(…

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## [Plot histogram with Plots](https://discourse.julialang.org/t/plot-histogram-with-plots/2304)

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**Author:** [@Andrea\_Tersigni](https://discourse.julialang.org/u/Andrea_Tersigni)\
**Replies:** 3\
**Last updated:** [February 25, 2017, 11:52pm UTC](https://discourse.julialang.org/t/plot-histogram-with-plots/2304 "2017-02-25T23:52:50Z")

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“In convertToAnyVector, could not handle the argument types: (Float64,)”

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## [Mesh format for saving vertices, edges and scalar labels](https://discourse.julialang.org/t/mesh-format-for-saving-vertices-edges-and-scalar-labels/2252)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 0\
**Last updated:** [February 23, 2017, 4:57pm UTC](https://discourse.julialang.org/t/mesh-format-for-saving-vertices-edges-and-scalar-labels/2252 "2017-02-23T16:57:56Z")

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What is the most simple mesh format in MeshIO to save a graph with scalar labels at the vertices and possibly scalar labels at the edges?

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## [Any reason holds Julia from having a proper Pochhammer function?](https://discourse.julialang.org/t/any-reason-holds-julia-from-having-a-proper-pochhammer-function/2273)

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**Author:** [@chobbes](https://discourse.julialang.org/u/chobbes)\
**Replies:** 9\
**Last updated:** [February 25, 2017, 12:41am UTC](https://discourse.julialang.org/t/any-reason-holds-julia-from-having-a-proper-pochhammer-function/2273 "2017-02-25T00:41:58Z")

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Overflow? Inaccuracy?

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## [Plotting time series and data from Quandl](https://discourse.julialang.org/t/plotting-time-series-and-data-from-quandl/2235)

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**Author:** [@Andrea\_Tersigni](https://discourse.julialang.org/u/Andrea_Tersigni)\
**Replies:** 5\
**Last updated:** [February 24, 2017, 10:55pm UTC](https://discourse.julialang.org/t/plotting-time-series-and-data-from-quandl/2235 "2017-02-24T22:55:42Z")

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Hello, I’m new and I’m learning how to get time series from Quandl and work with them. I just managed to get the time series with only dates and closing prices and I would like to plot it. I read all PyPlot and Plots pa…

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## [Announcement: JuMP 0.16 released](https://discourse.julialang.org/t/announcement-jump-0-16-released/2289)

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**Author:** [@miles.lubin](https://discourse.julialang.org/u/miles.lubin)\
**Replies:** 0\
**Last updated:** [February 24, 2017, 10:17pm UTC](https://discourse.julialang.org/t/announcement-jump-0-16-released/2289 "2017-02-24T22:17:01Z")

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We’re pleased to announce the release of JuMP 0.16. The release has three breaking changes that may affect many users, so keep reading. JuMP’s method for loading default solvers was a source of confusion and not compa…

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## [Fixed point decimal type](https://discourse.julialang.org/t/fixed-point-decimal-type/2227)

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**Author:** [@fengyang.wang](https://discourse.julialang.org/u/fengyang.wang)\
**Replies:** 2\
**Last updated:** [February 24, 2017, 12:30am UTC](https://discourse.julialang.org/t/fixed-point-decimal-type/2227 "2017-02-24T00:30:34Z")

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Is there a package that provides fixed point decimals? It seems that FixedPointNumbers.jl contains only binary fixed-point types and normed fixed-point types.

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## [Plots multiple groups of series from a dataframe (seems a bug in plots?)](https://discourse.julialang.org/t/plots-multiple-groups-of-series-from-a-dataframe-seems-a-bug-in-plots/2246)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 3\
**Last updated:** [February 23, 2017, 1:16pm UTC](https://discourse.julialang.org/t/plots-multiple-groups-of-series-from-a-dataframe-seems-a-bug-in-plots/2246 "2017-02-23T13:16:44Z")

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I am trying to plot multiple groups of series from a dataframe, distinguish the group by line attribute and the individual serie by colour. The problem is that, although I define my own palette, only the first group of…

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## [Creation of R formula with interpolated Julia Symbol (RCall)](https://discourse.julialang.org/t/creation-of-r-formula-with-interpolated-julia-symbol-rcall/2240)

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**Author:** [@Diego\_Javier\_Zea](https://discourse.julialang.org/u/Diego_Javier_Zea)\
**Replies:** 1\
**Last updated:** [February 23, 2017, 9:20am UTC](https://discourse.julialang.org/t/creation-of-r-formula-with-interpolated-julia-symbol-rcall/2240 "2017-02-23T09:20:49Z")

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I have Julia Symbols with the name of the columns and I want to interpolate those to R (using RCall) to run a R’s lm(). I found and alternative using R’s as.formula to construct the formula from a string. But I was wait…

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## [Construct a generic discrete distribution in Distributions.jl?](https://discourse.julialang.org/t/construct-a-generic-discrete-distribution-in-distributions-jl/2238)

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**Author:** [@xiaoweiz](https://discourse.julialang.org/u/xiaoweiz)\
**Replies:** 11\
**Last updated:** [February 23, 2017, 6:17am UTC](https://discourse.julialang.org/t/construct-a-generic-discrete-distribution-in-distributions-jl/2238 "2017-02-23T06:17:50Z")

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This may be a silly question. But what is the easies/most “julian” way to construct a generic discrete distribution type given a vector of outcomes and a vector of probabilities of the same length? It seems a workaround…

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## [Newbie Looking for Help - Code failing after adjusting constraints](https://discourse.julialang.org/t/newbie-looking-for-help-code-failing-after-adjusting-constraints/2230)

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**Author:** [@Pigskinablanket](https://discourse.julialang.org/u/Pigskinablanket)\
**Replies:** 1\
**Last updated:** [February 22, 2017, 10:42am UTC](https://discourse.julialang.org/t/newbie-looking-for-help-code-failing-after-adjusting-constraints/2230 "2017-02-22T10:42:57Z")

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Background - I am new at this and I didnt stay at a Holiday Inn Express last night, so I am struggling. I am using Julia/Jump code to Optimize lineup for Daily Fatasy Hockey with moderate success. I am working to conver…

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## [Tips on traversing/altering time-ordered cols](https://discourse.julialang.org/t/tips-on-traversing-altering-time-ordered-cols/2226)

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**Author:** [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Replies:** 0\
**Last updated:** [February 22, 2017, 1:52am UTC](https://discourse.julialang.org/t/tips-on-traversing-altering-time-ordered-cols/2226 "2017-02-22T01:52:28Z")

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Using one or more of the special purpose array types / time series / time-orderable data packages, I want to touch and sometimes spread or enfold or smooth or roughen the contents of one column using itself and using on…

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## [Newbie Q: printing solver progress to console](https://discourse.julialang.org/t/newbie-q-printing-solver-progress-to-console/2189)

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**Author:** [@Sam-H](https://discourse.julialang.org/u/Sam-H)\
**Replies:** 2\
**Last updated:** [February 21, 2017, 6:04pm UTC](https://discourse.julialang.org/t/newbie-q-printing-solver-progress-to-console/2189 "2017-02-21T18:04:37Z")

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I’m using Atom and having trouble getting it to print solver progress to the console. I’ve tried changing the ‘verbose’ parameter of the Cbc solver, and the STREAM\_MSG and STREAM\_LOG parameters of Mosek (free trial licen…

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## [C++ integration - complete example needed](https://discourse.julialang.org/t/c-integration-complete-example-needed/2214)

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**Author:** [@Albert65](https://discourse.julialang.org/u/Albert65)\
**Replies:** 12\
**Last updated:** [February 21, 2017, 4:04pm UTC](https://discourse.julialang.org/t/c-integration-complete-example-needed/2214 "2017-02-21T16:04:19Z")

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Hi All, My application is currently written in Matlab with few very specific and time consuming functions implemented as a MEX extensions in C++. I am thinking about switching to Julia or Python, and here is the problem…

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## [ODE.jl not efficient for Monte Carlo problem?](https://discourse.julialang.org/t/ode-jl-not-efficient-for-monte-carlo-problem/672)

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**Author:** [@111](https://discourse.julialang.org/u/111)\
**Replies:** 9\
**Last updated:** [February 21, 2017, 1:55pm UTC](https://discourse.julialang.org/t/ode-jl-not-efficient-for-monte-carlo-problem/672 "2017-02-21T13:55:01Z")

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My code solves the Monte Carlo problem of a large ensemble of particles interacting with field. I use the Newton’s Equations to evolve the system. Numerically, ordinary equation is needed. Some pieces of my code are as f…

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