# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=570

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**Page:** 571

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## [Lazy constraints : loop does not stop while they are satisfied](https://discourse.julialang.org/t/lazy-constraints-loop-does-not-stop-while-they-are-satisfied/957)

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**Author:** [@copti](https://discourse.julialang.org/u/copti)\
**Replies:** 3\
**Last updated:** [December 15, 2016, 1:30pm UTC](https://discourse.julialang.org/t/lazy-constraints-loop-does-not-stop-while-they-are-satisfied/957 "2016-12-15T13:30:59Z")

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Hello ! I am getting troubles using lazy constriants for solving a MILP (using Gurobi). My code is structured as follows : (here are some parts of it) # Extract from the code : using JuMP using Gurobi m = Model(sol…

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## [Optim.jl very slow](https://discourse.julialang.org/t/optim-jl-very-slow/941)

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**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 12\
**Last updated:** [December 15, 2016, 3:27am UTC](https://discourse.julialang.org/t/optim-jl-very-slow/941 "2016-12-15T03:27:18Z")

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I have a convex objective function that I want to minimize (unconstrained). It depends ~ 200 variables. I’m running Optim on it, but it takes forever (has been computing for a full day now). I want to improve the perfor…

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## [BioArgParse.jl](https://discourse.julialang.org/t/bioargparse-jl/959)

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**Author:** [@Ward9250](https://discourse.julialang.org/u/Ward9250)\
**Replies:** 0\
**Last updated:** [December 14, 2016, 11:54pm UTC](https://discourse.julialang.org/t/bioargparse-jl/959 "2016-12-14T23:54:32Z")

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I’ve been making scripts/packages with BioJulia packages which read in command line arguments, and I had to write some custom functions to take strings from command line and make Bio.jl types. Well, I’m lazy, ArgParse.jl…

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## [Block-triangular-form permutation?](https://discourse.julialang.org/t/block-triangular-form-permutation/818)

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**Author:** [@stustd](https://discourse.julialang.org/u/stustd)\
**Replies:** 2\
**Last updated:** [December 14, 2016, 10:02am UTC](https://discourse.julialang.org/t/block-triangular-form-permutation/818 "2016-12-14T10:02:30Z")

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Is there a function that permutes a sparse matrix (or its incidence graph) into block triangular form (BTF)?

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## [Column reordering of Cholesky using Givens rotations](https://discourse.julialang.org/t/column-reordering-of-cholesky-using-givens-rotations/323)

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**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 3\
**Last updated:** [December 13, 2016, 10:00pm UTC](https://discourse.julialang.org/t/column-reordering-of-cholesky-using-givens-rotations/323 "2016-12-13T22:00:10Z")

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Linpack, the predecessor of LAPACK, provided update/downdate functions for Cholesky decompositions (dchud, dchdd) as well as a function, dchex, to restore a Cholesky factor to triangular form after a left or right circul…

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## [New package: ForecastEval](https://discourse.julialang.org/t/new-package-forecasteval/774)

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**Author:** [@colintbowers](https://discourse.julialang.org/u/colintbowers)\
**Replies:** 0\
**Last updated:** [December 7, 2016, 5:03am UTC](https://discourse.julialang.org/t/new-package-forecasteval/774 "2016-12-07T05:03:16Z")

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I’ve just published a new package, ForecastEval, to the official METADATA. The package implements several of the statistical tests from the forecast evaluation literature including: Diebold, Mariano (1995) “Comparing P…

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## [Problems with GR](https://discourse.julialang.org/t/problems-with-gr/777)

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**Author:** [@Daneel](https://discourse.julialang.org/u/Daneel)\
**Replies:** 0\
**Last updated:** [December 7, 2016, 10:22am UTC](https://discourse.julialang.org/t/problems-with-gr/777 "2016-12-07T10:22:47Z")

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How do you close a figure created using GR? I plotted the Bessel.jl example but I can’t get it to close. Graphing from the REPL doesn’t look as nice as plotting in IJulia. vs Julia Version 0.5.0 (2016-09-19 18:14 …

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## [Announcement: ApproxFun v0.4.1, with documentation](https://discourse.julialang.org/t/announcement-approxfun-v0-4-1-with-documentation/769)

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**Author:** [@dlfivefifty](https://discourse.julialang.org/u/dlfivefifty)\
**Replies:** 0\
**Last updated:** [December 6, 2016, 8:50pm UTC](https://discourse.julialang.org/t/announcement-approxfun-v0-4-1-with-documentation/769 "2016-12-06T20:50:32Z")

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I’ve tagged a new release of ApproxFun, a package for approximating functions and solving linear equations, such as ODEs, PDEs and integral equations. I have (finally!) added documentation. Any suggestions for improvem…

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## [Pie color with plots](https://discourse.julialang.org/t/pie-color-with-plots/755)

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**Author:** [@harven](https://discourse.julialang.org/u/harven)\
**Replies:** 1\
**Last updated:** [December 6, 2016, 7:31pm UTC](https://discourse.julialang.org/t/pie-color-with-plots/755 "2016-12-06T19:31:54Z")

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How do I choose the colors of the parts of the pie with the plots package? I tried pie(\["1", "2", "3"\], \[.4, .1, .5\], fillcolor = \[:red, :green, :blue\]) so as to get the three pieces in red, green and blue, but the pie…

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## [What beats a flat array with strides for variables?](https://discourse.julialang.org/t/what-beats-a-flat-array-with-strides-for-variables/751)

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**Author:** [@hpoit](https://discourse.julialang.org/u/hpoit)\
**Replies:** 4\
**Last updated:** [December 6, 2016, 4:53pm UTC](https://discourse.julialang.org/t/what-beats-a-flat-array-with-strides-for-variables/751 "2016-12-06T16:53:53Z")

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Context - 10.A.1 I am wondering on how to support 10.A.1 on a range of data representations, managed by a dispatch system, for a library of operations (product, marginalization, maximization, reduction, …) I don’t want…

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## [Variable in legends](https://discourse.julialang.org/t/variable-in-legends/716)

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**Author:** [@chobbes](https://discourse.julialang.org/u/chobbes)\
**Replies:** 8\
**Last updated:** [December 5, 2016, 1:09pm UTC](https://discourse.julialang.org/t/variable-in-legends/716 "2016-12-05T13:09:20Z")

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I’m trying to add legends using Latex as follows: using PyPlot m = 100 xx = collect(linspace(-1.0, 1.0, 100)) yy = sin(m\*xx) zz = collect(linspace(-5, 3.0, 100)) figure(1) clf() h1, h2 = plot(xx, yy, "b.", xx, zz, "r…

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## [Testing OpenCL-based packages on Travis CI](https://discourse.julialang.org/t/testing-opencl-based-packages-on-travis-ci/403)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 10\
**Last updated:** [December 5, 2016, 11:21am UTC](https://discourse.julialang.org/t/testing-opencl-based-packages-on-travis-ci/403 "2016-12-05T11:21:40Z")

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My ImageQuilting.jl package has a big chunk of uncovered code because I am not sure what dependencies I should install on Travis CI before testing its GPU features. After a lot of effort refactoring and playing around wi…

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## [PyPlot: Individually-colored points possible?](https://discourse.julialang.org/t/pyplot-individually-colored-points-possible/696)

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**Author:** [@Daneel](https://discourse.julialang.org/u/Daneel)\
**Replies:** 3\
**Last updated:** [December 5, 2016, 10:51am UTC](https://discourse.julialang.org/t/pyplot-individually-colored-points-possible/696 "2016-12-05T10:51:51Z")

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Using PyPlot, what is a good way of plotting points which have individual colors? I don’t want to do a LineCollection, partly because I tried and it didn’t work. Basically every idea I have seems like a hack (scatter pl…

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## [PyPlot conflict with Intel MKL?](https://discourse.julialang.org/t/pyplot-conflict-with-intel-mkl/720)

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**Author:** [@stustd](https://discourse.julialang.org/u/stustd)\
**Replies:** 1\
**Last updated:** [December 4, 2016, 11:42am UTC](https://discourse.julialang.org/t/pyplot-conflict-with-intel-mkl/720 "2016-12-04T11:42:08Z")

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I’ve been invariably unsuccessful in trying to make PyPlot work with any Python 3.5 version that compiles Numpy against the (multicore) Intel MKL library (I have tried it with two versions: Intelpython35 from Intel Corp,…

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## [Imagesc in Julia v0.5](https://discourse.julialang.org/t/imagesc-in-julia-v0-5/519)

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**Author:** [@robertdj](https://discourse.julialang.org/u/robertdj)\
**Replies:** 9\
**Last updated:** [December 3, 2016, 12:30pm UTC](https://discourse.julialang.org/t/imagesc-in-julia-v0-5/519 "2016-12-03T12:30:11Z")

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Up to and including Julia v0.4 I have been using Winston for plotting, but I am experiencing problems in v0.5 and hence I am starting to use other packages. One particular thing I miss is the imagesc function for viewin…

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## [When colwise generate a couple of arrays instead of one array with many elements](https://discourse.julialang.org/t/when-colwise-generate-a-couple-of-arrays-instead-of-one-array-with-many-elements/663)

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**Author:** [@Hongwei](https://discourse.julialang.org/u/Hongwei)\
**Replies:** 2\
**Last updated:** [December 2, 2016, 2:19pm UTC](https://discourse.julialang.org/t/when-colwise-generate-a-couple-of-arrays-instead-of-one-array-with-many-elements/663 "2016-12-02T14:19:53Z")

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Hi guys, cf = colwise(mean, test) #test is a two columns data frame I got: dump(cf) Array{Any}((2,)) 1: Array{Float64}((1,)) \[0.056307\] 2: Array{Float64}((1,)) \[0.0330923\] So I have to use \[float(cf\[i\]\[1\]) for i …

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## [ERROR: type CoefTable has no field mat](https://discourse.julialang.org/t/error-type-coeftable-has-no-field-mat/688)

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**Author:** [@Harish\_Kumar](https://discourse.julialang.org/u/Harish_Kumar)\
**Replies:** 1\
**Last updated:** [December 2, 2016, 2:05pm UTC](https://discourse.julialang.org/t/error-type-coeftable-has-no-field-mat/688 "2016-12-02T14:05:57Z")

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After getting estimate for lmm, I am using coeftable to covert in to DF. But in 0.5 Julia i am getting below error ERROR: type CoefTable has no field mat. Is it due to any library mismatch? LMM output… Fixed-effects …

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## [Convergence of hcubature](https://discourse.julialang.org/t/convergence-of-hcubature/660)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 10\
**Last updated:** [December 2, 2016, 1:38pm UTC](https://discourse.julialang.org/t/convergence-of-hcubature/660 "2016-12-02T13:38:43Z")

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I am trying to integrate a Lorentzian offset by a smooth function which is defined on a 3D polar domain. Here is the code: using Cubature lorentzian\_re(freq, ampl, freq0, fwhm) = ampl ./ (1 + ((freq - freq0) / fwhm).^2…

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## [How to get p value from Chi Square table](https://discourse.julialang.org/t/how-to-get-p-value-from-chi-square-table/649)

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**Author:** [@Hongwei](https://discourse.julialang.org/u/Hongwei)\
**Replies:** 6\
**Last updated:** [November 30, 2016, 5:09pm UTC](https://discourse.julialang.org/t/how-to-get-p-value-from-chi-square-table/649 "2016-11-30T17:09:27Z")

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Hi guys, Given cquantile(Chisq(1), .005), we can get its Chi square table value 7.8 Is there anyway to get the corresponding p value when given Chi square table value and freedom? Thanks, Hongwei

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## [The \`perm\`of \`permutedims(A,perm)\`](https://discourse.julialang.org/t/the-perm-of-permutedims-a-perm/572)

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**Author:** [@hpoit](https://discourse.julialang.org/u/hpoit)\
**Replies:** 16\
**Last updated:** [November 30, 2016, 11:55am UTC](https://discourse.julialang.org/t/the-perm-of-permutedims-a-perm/572 "2016-11-30T11:55:49Z")

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@yuyichao So you’re saying perm necessarily has to be an ordered basis and cannot be a set?

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## [GLVisualize.jl for multi-dimensional arrays](https://discourse.julialang.org/t/glvisualize-jl-for-multi-dimensional-arrays/639)

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**Author:** [@hpoit](https://discourse.julialang.org/u/hpoit)\
**Replies:** 7\
**Last updated:** [November 30, 2016, 11:35am UTC](https://discourse.julialang.org/t/glvisualize-jl-for-multi-dimensional-arrays/639 "2016-11-30T11:35:37Z")

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@sdanisch is there a way to visualize A = ones(3,3,3,3,3) on GLVisualize.jl with some sort of hack?

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## [ArrayFire Julia: Implementation of gfor?](https://discourse.julialang.org/t/arrayfire-julia-implementation-of-gfor/633)

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**Author:** [@pedroborgesmelo](https://discourse.julialang.org/u/pedroborgesmelo)\
**Replies:** 4\
**Last updated:** [November 30, 2016, 5:03am UTC](https://discourse.julialang.org/t/arrayfire-julia-implementation-of-gfor/633 "2016-11-30T05:03:16Z")

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Hi! Anyone knows how to implement something equivalent to gfor using the existing ArrayFire wrapper? I guess gfor is not wrapped… Regards,

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## [Publication-ready plots](https://discourse.julialang.org/t/publication-ready-plots/618)

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**Author:** [@Balinus](https://discourse.julialang.org/u/Balinus)\
**Replies:** 7\
**Last updated:** [November 28, 2016, 8:01pm UTC](https://discourse.julialang.org/t/publication-ready-plots/618 "2016-11-28T20:01:25Z")

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Hello, is there any “how-to” concerning publication-ready plots? For example, I used these commands, but only got a 600x400 pixels png. using Plots default(show = true) plot(rand(10,4), linestyle=\[:solid :dash\]) savef…

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## [Plots.jl: multiple plots in same subplot](https://discourse.julialang.org/t/plots-jl-multiple-plots-in-same-subplot/602)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 4\
**Last updated:** [November 28, 2016, 1:34pm UTC](https://discourse.julialang.org/t/plots-jl-multiple-plots-in-same-subplot/602 "2016-11-28T13:34:42Z")

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The documentation has several examples of how to plot several traces of the same length on either the same or different plots and it is easier to overlook the fact that one can modify an existing plot also with the comma…

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## [OpenGL 3.3 testing on Travis](https://discourse.julialang.org/t/opengl-3-3-testing-on-travis/571)

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**Author:** [@barche](https://discourse.julialang.org/u/barche)\
**Replies:** 3\
**Last updated:** [November 27, 2016, 5:21pm UTC](https://discourse.julialang.org/t/opengl-3-3-testing-on-travis/571 "2016-11-27T17:21:23Z")

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I’m trying to run some OpenGL tests on Travis in xvfb, but it seems the OpenGL version is 3.0 while I need 3.3 at least. Does anyone here happen to be running a travis config that accomplishes this? My current travis fil…

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## [BLAS performance issues for common neural network patterns](https://discourse.julialang.org/t/blas-performance-issues-for-common-neural-network-patterns/565)

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**Author:** [@FlorinGogianu](https://discourse.julialang.org/u/FlorinGogianu)\
**Replies:** 5\
**Last updated:** [November 25, 2016, 6:28pm UTC](https://discourse.julialang.org/t/blas-performance-issues-for-common-neural-network-patterns/565 "2016-11-25T18:28:58Z")

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Hi, I’ve been following Julia development on and off and with the buzz around the latest release I decided to give it another try by writing a small neural network library. I am working on a daily basis with Torch so I …

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## [What does Julia GPU today?](https://discourse.julialang.org/t/what-does-julia-gpu-today/311)

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**Author:** [@JeffreySarnoff](https://discourse.julialang.org/u/JeffreySarnoff)\
**Replies:** 6\
**Last updated:** [November 25, 2016, 3:42am UTC](https://discourse.julialang.org/t/what-does-julia-gpu-today/311 "2016-11-25T03:42:19Z")

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I would like to catch up with what has been accomplished, which sorts of capability are well supported and where Julia’s GPU adventure goes next.

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## [Step-by-step hidden Markov chain log-likelihood calculation](https://discourse.julialang.org/t/step-by-step-hidden-markov-chain-log-likelihood-calculation/527)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 3\
**Last updated:** [November 24, 2016, 2:14pm UTC](https://discourse.julialang.org/t/step-by-step-hidden-markov-chain-log-likelihood-calculation/527 "2016-11-24T14:14:47Z")

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I have a HMC for which the transition and observation matrices are time varying (and have some 0 elements). I would like to calculate the log-likelihood (for Bayesian inference). Which library should I use? I looked at …

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## [Display Plots.jl plot in Juliabox](https://discourse.julialang.org/t/display-plots-jl-plot-in-juliabox/451)

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**Author:** [@mzaffalon](https://discourse.julialang.org/u/mzaffalon)\
**Replies:** 8\
**Last updated:** [November 21, 2016, 2:54pm UTC](https://discourse.julialang.org/t/display-plots-jl-plot-in-juliabox/451 "2016-11-21T14:54:53Z")

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I am using Plots.jl with PlotlyJS backend in Juliabox and I find myself in the situation of calling add\_plot to add a trace at the time. I then call gui() at the end of the cell to display the plot. The following code us…

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## [Teaching data analysis with Julia - what to do about DataFrames and all that?](https://discourse.julialang.org/t/teaching-data-analysis-with-julia-what-to-do-about-dataframes-and-all-that/422)

<div class="topic-metadata">

**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 18\
**Last updated:** [November 21, 2016, 9:16am UTC](https://discourse.julialang.org/t/teaching-data-analysis-with-julia-what-to-do-about-dataframes-and-all-that/422 "2016-11-21T09:16:27Z")

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I will be teaching a couple of workshops on fitting mixed-effects models with Julia early in 2017. The audience will know some R but probably not know any Julia. Some may know about dplyr and Hadley Wickham’s approach a…

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