# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=524

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**Page:** 525

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## [HTTP and MbedTLS installation issues](https://discourse.julialang.org/t/http-and-mbedtls-installation-issues/15422)

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**Author:** [@Alexander-Barth](https://discourse.julialang.org/u/Alexander-Barth)\
**Replies:** 1\
**Last updated:** [September 24, 2018, 1:30pm UTC](https://discourse.julialang.org/t/http-and-mbedtls-installation-issues/15422 "2018-09-24T13:30:14Z")

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I have some code requiring HTTP (and thus MbedTLS) which I need to run on a Linux machine with glib 2.12. I had to pin the MbedTLS version to 0.6.1 because of some glib incompatibilities (https://github.com/JuliaWeb/Mbe…

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## [Changing font style for latex rendering using PyPlot](https://discourse.julialang.org/t/changing-font-style-for-latex-rendering-using-pyplot/5910)

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**Author:** [@josimar](https://discourse.julialang.org/u/josimar)\
**Replies:** 11\
**Last updated:** [September 23, 2018, 6:36pm UTC](https://discourse.julialang.org/t/changing-font-style-for-latex-rendering-using-pyplot/5910 "2018-09-23T18:36:40Z")

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Hi all, I am trying to make plots, using PyPlot, that have latex equations. Does anyone know how to change the font of the default latex render in PyPlot ? Right now I am using the following: PyPlot.matplotlib\[:rc\]("te…

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## [Julia/Knet deep learning tutorial available with free GPUs from Google Colab](https://discourse.julialang.org/t/julia-knet-deep-learning-tutorial-available-with-free-gpus-from-google-colab/15352)

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**Author:** [@denizyuret](https://discourse.julialang.org/u/denizyuret)\
**Replies:** 6\
**Last updated:** [September 23, 2018, 3:29pm UTC](https://discourse.julialang.org/t/julia-knet-deep-learning-tutorial-available-with-free-gpus-from-google-colab/15352 "2018-09-23T15:29:53Z")

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To try it out, please follow the instructions at https://github.com/denizyuret/Knet.jl/tree/dy/1.1/tutorial and let me know if anything does not work. Thanks @jekbradbury for figuring this out.

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## [Support for Sparse Matrices on GPU (CUSPARSE)](https://discourse.julialang.org/t/support-for-sparse-matrices-on-gpu-cusparse/15294)

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**Author:** [@mboratko](https://discourse.julialang.org/u/mboratko)\
**Replies:** 1\
**Last updated:** [September 22, 2018, 4:34pm UTC](https://discourse.julialang.org/t/support-for-sparse-matrices-on-gpu-cusparse/15294 "2018-09-22T16:34:17Z")

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Do any of the ML libraries (Flux, KNet) support sparse matrices on the GPU?

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## [Makie coloring of surface plots](https://discourse.julialang.org/t/makie-coloring-of-surface-plots/15298)

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**Author:** [@lwhitefox](https://discourse.julialang.org/u/lwhitefox)\
**Replies:** 2\
**Last updated:** [September 22, 2018, 2:30pm UTC](https://discourse.julialang.org/t/makie-coloring-of-surface-plots/15298 "2018-09-22T14:30:16Z")

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My understanding is that when generating surface plots in Makie, colors are assigned per vertex. I’m surprised that when I run the small sample code below, which assigns one color value for each vertex in a 4 by 3 set o…

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## [Query.jl - filtering on missing data](https://discourse.julialang.org/t/query-jl-filtering-on-missing-data/14898)

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**Author:** [@mdsalerno](https://discourse.julialang.org/u/mdsalerno)\
**Replies:** 7\
**Last updated:** [September 21, 2018, 5:08pm UTC](https://discourse.julialang.org/t/query-jl-filtering-on-missing-data/14898 "2018-09-21T17:08:58Z")

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What is the correct way to filter on missing values? The following does not work properly: result = @from r in df begin @where !ismissing(r.A) @select r @collect DataFrame end When I run such a query, the @…

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## [Sun Symbol with LaTeXStrings](https://discourse.julialang.org/t/sun-symbol-with-latexstrings/15250)

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**Author:** [@astrowanders](https://discourse.julialang.org/u/astrowanders)\
**Replies:** 5\
**Last updated:** [September 21, 2018, 3:12pm UTC](https://discourse.julialang.org/t/sun-symbol-with-latexstrings/15250 "2018-09-21T15:12:00Z")

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Hello! In the past, I’ve used LaTeXStrings to label plot axis with solar units, like the solar luminosity on the y-axis of the plot below, with “\\astrosun”. It seems that neither “\\astrosun” nor “\\odot” are recognized n…

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## [Optimizing the use of Blocks, Threads vs. Array Indexing](https://discourse.julialang.org/t/optimizing-the-use-of-blocks-threads-vs-array-indexing/7537)

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**Author:** [@drjoke](https://discourse.julialang.org/u/drjoke)\
**Replies:** 15\
**Last updated:** [September 21, 2018, 3:09pm UTC](https://discourse.julialang.org/t/optimizing-the-use-of-blocks-threads-vs-array-indexing/7537 "2018-09-21T15:09:21Z")

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Assume that in Julia I have the following, which I assume should be OK because arrays in Julia are column major. x = Array{Float32, 3}(500, 20, 200) # Initialize x for c = 1:200 for b = 1:20 for a = 1:500 …

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## [\[API Design\] Callable objects with side effect in Julia](https://discourse.julialang.org/t/api-design-callable-objects-with-side-effect-in-julia/15243)

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**Author:** [@Roger-luo](https://discourse.julialang.org/u/Roger-luo)\
**Replies:** 0\
**Last updated:** [September 20, 2018, 6:13pm UTC](https://discourse.julialang.org/t/api-design-callable-objects-with-side-effect-in-julia/15243 "2018-09-20T18:13:42Z")

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In a recent package we developed (https://github.com/QuantumBFS/Yao.jl) we represent quantum circuit as a tree (just think about operators compiled as a tree), which is called block in the packages. It looks natural and…

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## [Mosek returns Unknown status](https://discourse.julialang.org/t/mosek-returns-unknown-status/15189)

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**Author:** [@Rasoul](https://discourse.julialang.org/u/Rasoul)\
**Replies:** 1\
**Last updated:** [September 20, 2018, 4:45pm UTC](https://discourse.julialang.org/t/mosek-returns-unknown-status/15189 "2018-09-20T16:45:50Z")

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I got “unknown status” when I run the following code using MultivariatePolynomials using JuMP using PolyJuMP using SumOfSquares using DynamicPolynomials using Mosek using SemialgebraicSets @polyvar x m = SOSModel(solv…

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## [JuMP installation error](https://discourse.julialang.org/t/jump-installation-error/15198)

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**Author:** [@ssriram1992](https://discourse.julialang.org/u/ssriram1992)\
**Replies:** 5\
**Last updated:** [September 20, 2018, 3:42pm UTC](https://discourse.julialang.org/t/jump-installation-error/15198 "2018-09-20T15:42:17Z")

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I use Julia 1.0 and when I get an error when I try to install JuMP julia\> Pkg.add("JuMP") Resolving package versions... Updating \`~/.julia/environments/v1.1/Project.toml\` \[4076af6c\] + JuMP v0.18.2 Updating \`~/.ju…

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## [HDF and JLD have been unbuildable on macs for months... Not sure anyone is addressing](https://discourse.julialang.org/t/hdf-and-jld-have-been-unbuildable-on-macs-for-months-not-sure-anyone-is-addressing/13468)

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**Author:** [@nickeubank](https://discourse.julialang.org/u/nickeubank)\
**Replies:** 5\
**Last updated:** [September 20, 2018, 2:29pm UTC](https://discourse.julialang.org/t/hdf-and-jld-have-been-unbuildable-on-macs-for-months-not-sure-anyone-is-addressing/13468 "2018-09-20T14:29:21Z")

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So for several months now HDF.jl and JLD.jl are unbuildable on macs because of a problem with Homebrew.jl. It’s been brought up in a number of places by a number of people (here, here, here, here, here, here, and more I’…

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## [Reading large Excel files (with UTF-8 entries) for caching and later processing?](https://discourse.julialang.org/t/reading-large-excel-files-with-utf-8-entries-for-caching-and-later-processing/15165)

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**Author:** [@robertfeldt](https://discourse.julialang.org/u/robertfeldt)\
**Replies:** 8\
**Last updated:** [September 20, 2018, 12:25pm UTC](https://discourse.julialang.org/t/reading-large-excel-files-with-utf-8-entries-for-caching-and-later-processing/15165 "2018-09-20T12:25:42Z")

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There seem to be many options for how to read Excel files into Julia and caching them for later/future processing. Can someone recommend a few good ways? Would ExcelFiles.jl and JuliaDB.jl be a good first try? Or is some…

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## [Sum() syntax](https://discourse.julialang.org/t/sum-syntax/14589)

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**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 19\
**Last updated:** [September 20, 2018, 12:10pm UTC](https://discourse.julialang.org/t/sum-syntax/14589 "2018-09-20T12:10:38Z")

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Hello, from the JuMP quick guide, i’ve seen i can use the sum() function with a condition, like this: sum(expression for i = I1, j = I2 if cond) is the same as: a = zero(AffExpr) for i = I1 for j = I2 ... …

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## [Removing Makie](https://discourse.julialang.org/t/removing-makie/15226)

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**Author:** [@muriloasouza](https://discourse.julialang.org/u/muriloasouza)\
**Replies:** 2\
**Last updated:** [September 20, 2018, 12:09pm UTC](https://discourse.julialang.org/t/removing-makie/15226 "2018-09-20T12:09:19Z")

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Hello, i’m trying to remove Makie, since i’m not going to use it anymore, and it’s causing some errors in my code. But i’m having this problem. julia\> Pkg.rm("Makie") WARNING: julia is fixed at 0.6.3 conflicting with re…

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## [How can I rasterize the polygons of a Shapefile in Julia?](https://discourse.julialang.org/t/how-can-i-rasterize-the-polygons-of-a-shapefile-in-julia/15089)

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**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 18\
**Last updated:** [September 20, 2018, 9:51am UTC](https://discourse.julialang.org/t/how-can-i-rasterize-the-polygons-of-a-shapefile-in-julia/15089 "2018-09-20T09:51:51Z")

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Just to explain the title for those unfamiliar: a Shapefile is a common file format for vectorized geospatial data. I wonder if someone can help me figure out how to rasterize Shapefiles in Julia? There are several rele…

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## [ControlSystems: dlqr method](https://discourse.julialang.org/t/controlsystems-dlqr-method/15217)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 1\
**Last updated:** [September 20, 2018, 7:47am UTC](https://discourse.julialang.org/t/controlsystems-dlqr-method/15217 "2018-09-20T07:47:10Z")

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I’m a little confused by the “docstring”/documentation of dlqr: dlqr(A, B, Q, R), dlqr(sys, Q, R) Calculate the optimal gain matrix K for the state-feedback law u\[k\] = K\*x\[k\] that minimizes the cost function: J …

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## [Flux - support for mini-batches](https://discourse.julialang.org/t/flux-support-for-mini-batches/14718)

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**Author:** [@sheevy](https://discourse.julialang.org/u/sheevy)\
**Replies:** 2\
**Last updated:** [September 20, 2018, 7:13am UTC](https://discourse.julialang.org/t/flux-support-for-mini-batches/14718 "2018-09-20T07:13:56Z")

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Hi, Does Flux.train! have support for mini-batches out of the box? If it does I couldn’t see it. Does it mean in need to restructure my data and rewrite the loss function to act on the mini-batch at once? Thanks

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## [Memory leak in 1.0 while using IJulia, DataFrames and LibPQ?](https://discourse.julialang.org/t/memory-leak-in-1-0-while-using-ijulia-dataframes-and-libpq/15163)

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**Author:** [@johann.spies](https://discourse.julialang.org/u/johann.spies)\
**Replies:** 1\
**Last updated:** [September 20, 2018, 3:30am UTC](https://discourse.julialang.org/t/memory-leak-in-1-0-while-using-ijulia-dataframes-and-libpq/15163 "2018-09-20T03:30:32Z")

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I just had the experience that running a query to a PostgreSQL database using IJulia and LibPQ brought my computer to a halt and I had to push the power button to shut it off. This happened in 1.0. The memory usage was …

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## [Plotting multiple datasets in the same chart in VegaLite](https://discourse.julialang.org/t/plotting-multiple-datasets-in-the-same-chart-in-vegalite/14964)

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**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 6\
**Last updated:** [September 19, 2018, 1:41pm UTC](https://discourse.julialang.org/t/plotting-multiple-datasets-in-the-same-chart-in-vegalite/14964 "2018-09-19T13:41:33Z")

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Is it possible to plot multiple datasets in the same VegaLite chart without merging them beforehand? I thought “adding” two @vlplot statements like this would work, but it only displays the sp500 data. using VegaLite, Q…

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## [Open Data Access Protocol](https://discourse.julialang.org/t/open-data-access-protocol/13158)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 8\
**Last updated:** [September 19, 2018, 2:24pm UTC](https://discourse.julialang.org/t/open-data-access-protocol/13158 "2018-09-19T14:24:24Z")

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Is anyone able to use OpenDAP with Julia https://www.opendap.org/ I am at JuliaCON and maybe we could chat? Or maybe look at this at the Hackathon tomorrow? I would like to download a dataset of sea surface temperatur…

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## [Plotting packages that support Julia v1.0](https://discourse.julialang.org/t/plotting-packages-that-support-julia-v1-0/14125)

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**Author:** [@Neonlights](https://discourse.julialang.org/u/Neonlights)\
**Replies:** 33\
**Last updated:** [September 19, 2018, 2:15pm UTC](https://discourse.julialang.org/t/plotting-packages-that-support-julia-v1-0/14125 "2018-09-19T14:15:26Z")

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Is there a list of Plot packages that are confirmed as working with Julia 1.0? I’ve seen Gadfly isn’t there yet, which is unfortunate as I wanted to start learning Julia through using that one.

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## [Redraw in GKSTerm Asleep? (and Gray mysteries)](https://discourse.julialang.org/t/redraw-in-gksterm-asleep-and-gray-mysteries/15099)

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**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 11\
**Last updated:** [September 19, 2018, 8:53am UTC](https://discourse.julialang.org/t/redraw-in-gksterm-asleep-and-gray-mysteries/15099 "2018-09-19T08:53:36Z")

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Dear Plots wizards—macos. julia 1.0.0. Plots.jl with standard gr() backend. Vanilla install. Please type this in: $ julia julia\> using Plots julia\> plot( \[-1,10\], \[-1,10\], color=Gray(0.5), w=30, title="gray scale…

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## [Dates - Randomly generating DateTime values](https://discourse.julialang.org/t/dates-randomly-generating-datetime-values/15156)

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**Author:** [@mdsalerno](https://discourse.julialang.org/u/mdsalerno)\
**Replies:** 2\
**Last updated:** [September 19, 2018, 8:16am UTC](https://discourse.julialang.org/t/dates-randomly-generating-datetime-values/15156 "2018-09-19T08:16:26Z")

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I have two DateTimes, dt1 \< dt2. What is a reasonable way to randomly generate a DateTime that is in between dt1 and dt2? I started off by trying dt3 = rand(dt1.instant.periods.value : dt2.instant.periods.value). Thi…

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## [Makie: How to define subscenes and/or different plot windows](https://discourse.julialang.org/t/makie-how-to-define-subscenes-and-or-different-plot-windows/15050)

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**Author:** [@MartinOtter](https://discourse.julialang.org/u/MartinOtter)\
**Replies:** 7\
**Last updated:** [September 18, 2018, 4:14pm UTC](https://discourse.julialang.org/t/makie-how-to-define-subscenes-and-or-different-plot-windows/15050 "2018-09-18T16:14:20Z")

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Could someone give a hint how to define subscenes (to have several figures in one scene) or define several plot windows with Makie?

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## [Can't add Windows workers due to a missing sh shell](https://discourse.julialang.org/t/cant-add-windows-workers-due-to-a-missing-sh-shell/15055)

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**Author:** [@turtle](https://discourse.julialang.org/u/turtle)\
**Replies:** 4\
**Last updated:** [September 18, 2018, 12:40pm UTC](https://discourse.julialang.org/t/cant-add-windows-workers-due-to-a-missing-sh-shell/15055 "2018-09-18T12:40:07Z")

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I am trying to add workers on a Windows 10 node from a Windows 10 master. Identical Julia 0.7.0 and passwordless login are set up correctly. However addprocs( \[(remote\_ip,6)\] ) fails with the error message: ‘sh’ is no…

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## [Install Mosek.jl](https://discourse.julialang.org/t/install-mosek-jl/15083)

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**Author:** [@Rasoul](https://discourse.julialang.org/u/Rasoul)\
**Replies:** 14\
**Last updated:** [September 18, 2018, 1:57am UTC](https://discourse.julialang.org/t/install-mosek-jl/15083 "2018-09-18T01:57:08Z")

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I tried Pkg.add(“Mosek”) to add Mosek package but I got the following error " unknown package Mosek". I have no idea why I have received this error. Please let me know if you have been in the same situation.

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## [Julia's machine learning based on the PyCall mechanism](https://discourse.julialang.org/t/julias-machine-learning-based-on-the-pycall-mechanism/13840)

<div class="topic-metadata">

**Author:** [@sysk\_msk](https://discourse.julialang.org/u/sysk_msk)\
**Replies:** 2\
**Last updated:** [September 18, 2018, 12:50am UTC](https://discourse.julialang.org/t/julias-machine-learning-based-on-the-pycall-mechanism/13840 "2018-09-18T00:50:10Z")

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As we all know, there are many Python machine learning resources freely available online.Thus I have researched how to easily use Python libraries with Julia. Here are some examples to explain the correct Calling Pose f…

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## [Interpolated data contour plot like surface](https://discourse.julialang.org/t/interpolated-data-contour-plot-like-surface/15040)

<div class="topic-metadata">

**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 5\
**Last updated:** [September 17, 2018, 11:55pm UTC](https://discourse.julialang.org/t/interpolated-data-contour-plot-like-surface/15040 "2018-09-17T23:55:17Z")

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Dear Plots experts—sorry, another question. if I have 3-D data (not function), I can use surface for a nice interpolated plot. alas, it’s not been adapted to a contour plot. and it clearly needs some smoothing aspects…

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## [Releasing processes by restarting the kernel](https://discourse.julialang.org/t/releasing-processes-by-restarting-the-kernel/15066)

<div class="topic-metadata">

**Author:** [@Snir\_Gazit](https://discourse.julialang.org/u/Snir_Gazit)\
**Replies:** 0\
**Last updated:** [September 17, 2018, 1:08pm UTC](https://discourse.julialang.org/t/releasing-processes-by-restarting-the-kernel/15066 "2018-09-17T13:08:26Z")

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Does restarting a kernel (either from the command line or Jupyter) will also release running processes added by addprocs()? By looking at the CPU usage using top from the command line, it appears that this is not the cas…

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