# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1413

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 1414

---

## [What Does \`:=\` Do?](https://discourse.julialang.org/t/what-does-do/59957)

<div class="topic-metadata">

**Author:** [@ParadaCarleton](https://discourse.julialang.org/u/ParadaCarleton)\
**Replies:** 5\
**Last updated:** [April 24, 2021, 10:25pm UTC](https://discourse.julialang.org/t/what-does-do/59957 "2021-04-24T22:25:40Z")

</div>

What the title says. I can’t figure it out, and the docs just provide the not at all useful description: x := y is a synonym for x = x : y Which apparently means something different from what I expected to, given the f…

---

## [Inexact error with rand function](https://discourse.julialang.org/t/inexact-error-with-rand-function/59954)

<div class="topic-metadata">

**Author:** [@Wei\_Yang](https://discourse.julialang.org/u/Wei_Yang)\
**Replies:** 2\
**Last updated:** [April 24, 2021, 10:02pm UTC](https://discourse.julialang.org/t/inexact-error-with-rand-function/59954 "2021-04-24T22:02:51Z")

</div>

I have defined the following distribution using Distributions, Random struct ComplexNormal \<:ContinuousUnivariateDistribution μ::ComplexF64 σ::Float64 function ComplexNormal(μ=0,σ=1) new(μ,σ) end end Bas…

---

## [\[ANN\] RSDeltaSigmaPort (ΔΣ Toolbox)](https://discourse.julialang.org/t/ann-rsdeltasigmaport-toolbox/59297)

<div class="topic-metadata">

**Author:** [@MA\_Laforge](https://discourse.julialang.org/u/MA_Laforge)\
**Replies:** 3\
**Last updated:** [April 24, 2021, 9:52pm UTC](https://discourse.julialang.org/t/ann-rsdeltasigmaport-toolbox/59297 "2021-04-24T21:52:53Z")

</div>

(Before someone inevitably starts their own port from scratch again…) RSDeltaSigmaPort.jl: A Port of Richard Schreier’s Delta Sigma Toolbox!: Goals Tries to stick to the overall structure of the original toolbo…

---

## [Get ambiguous method candidates](https://discourse.julialang.org/t/get-ambiguous-method-candidates/59953)

<div class="topic-metadata">

**Author:** [@jzr](https://discourse.julialang.org/u/jzr)\
**Replies:** 1\
**Last updated:** [April 24, 2021, 9:17pm UTC](https://discourse.julialang.org/t/get-ambiguous-method-candidates/59953 "2021-04-24T21:17:56Z")

</div>

struct Foo end struct Bar end f(x::Foo, y) = 2 f(x, y::Bar) = 3 f(Foo(), Bar()) # ambiguous This errors because of ambiguity. How can I get the list of candidate functions? I’m not sure why methods(f, (Foo, Bar)) re…

---

## [Error in Pkg.build: " override this by setting \`ignore\_platform\` "](https://discourse.julialang.org/t/error-in-pkg-build-override-this-by-setting-ignore-platform/59948)

<div class="topic-metadata">

**Author:** [@Hannah\_Rocio\_Santa\_C](https://discourse.julialang.org/u/Hannah_Rocio_Santa_C)\
**Replies:** 1\
**Last updated:** [April 24, 2021, 8:26pm UTC](https://discourse.julialang.org/t/error-in-pkg-build-override-this-by-setting-ignore-platform/59948 "2021-04-24T20:26:46Z")

</div>

Hello, I’m hoping someone could help me with an error message I get when trying to build Arpack. I get the following message, which seems quite useful, but I don’t actually know how to follow the suggestion, so I was h…

---

## [LinearAlgebra.BLAS does not accept non-dense Julia Matrix type?](https://discourse.julialang.org/t/linearalgebra-blas-does-not-accept-non-dense-julia-matrix-type/59921)

<div class="topic-metadata">

**Author:** [@JianghuiDu](https://discourse.julialang.org/u/JianghuiDu)\
**Replies:** 3\
**Last updated:** [April 24, 2021, 6:55pm UTC](https://discourse.julialang.org/t/linearalgebra-blas-does-not-accept-non-dense-julia-matrix-type/59921 "2021-04-24T18:55:37Z")

</div>

LinearAlgebra.BLAS.gbmv!('N', 100, 1, 1, 1.0, A\_POC, ones(100), 0.0, ones(100)) throws error julia\> LinearAlgebra.BLAS.gbmv!('N', 100, 1, 1, 1.0, (A\_POC), ones(100), 0.0, on es(100)) ERROR: LoadError: MethodError: no m…

---

## [Readlines() output format](https://discourse.julialang.org/t/readlines-output-format/59941)

<div class="topic-metadata">

**Author:** [@Oto\_Brzobohaty](https://discourse.julialang.org/u/Oto_Brzobohaty)\
**Replies:** 2\
**Last updated:** [April 24, 2021, 6:16pm UTC](https://discourse.julialang.org/t/readlines-output-format/59941 "2021-04-24T18:16:02Z")

</div>

I have tried to read lines from text file filename.ixc using readlines() function readlines("filename.ixc") and I have got strange output format. In vscode I can see the file content as plaintext, a few lines follow …

---

## [Part of DifferentialEquations failing to compile](https://discourse.julialang.org/t/part-of-differentialequations-failing-to-compile/38302)

<div class="topic-metadata">

**Author:** [@Oscar\_Reula](https://discourse.julialang.org/u/Oscar_Reula)\
**Replies:** 4\
**Last updated:** [April 24, 2021, 5:16pm UTC](https://discourse.julialang.org/t/part-of-differentialequations-failing-to-compile/38302 "2021-04-24T17:16:05Z")

</div>

Parts of DifferentialEquations Package are not compiling. I can compile other packages, like Plots, etc. But not DE. The error is: \[ Info: Precompiling DifferentialEquations \[0c46a032-eb83-5123-abaf-570d42b7fbaa\] ERRO…

---

## ["Mutating arrays is not supported" error when running FluxML/vae\_mnist.jl](https://discourse.julialang.org/t/mutating-arrays-is-not-supported-error-when-running-fluxml-vae-mnist-jl/59890)

<div class="topic-metadata">

**Author:** [@conditionality](https://discourse.julialang.org/u/conditionality)\
**Replies:** 3\
**Last updated:** [April 24, 2021, 5:07pm UTC](https://discourse.julialang.org/t/mutating-arrays-is-not-supported-error-when-running-fluxml-vae-mnist-jl/59890 "2021-04-24T17:07:52Z")

</div>

Hi, I’m trying to run the file found here: https://github.com/FluxML/model-zoo/blob/master/vision/vae\_mnist/vae\_mnist.jl But when I do, I get the error “LoadError: Mutating arrays is not supported” and it complains abo…

---

## [\[ANN\] FourierTools.jl | Tools for working with Fourier space](https://discourse.julialang.org/t/ann-fouriertools-jl-tools-for-working-with-fourier-space/59930)

<div class="topic-metadata">

**Author:** [@roflmaostc](https://discourse.julialang.org/u/roflmaostc)\
**Replies:** 1\
**Last updated:** [April 24, 2021, 1:17pm UTC](https://discourse.julialang.org/t/ann-fouriertools-jl-tools-for-working-with-fourier-space/59930 "2021-04-24T13:17:29Z")

</div>

Hey, today we can announce the release of FourierTools.jl. The package, as the name suggests, provides several tools based on Fourier space. The workhorse behind many algorithms is of course FFTW.jl. Features sinc …

---

## [\[ANN\] FFTInterpolations.jl - sinc interpolation based on FFTs](https://discourse.julialang.org/t/ann-fftinterpolations-jl-sinc-interpolation-based-on-ffts/53189)

<div class="topic-metadata">

**Author:** [@roflmaostc](https://discourse.julialang.org/u/roflmaostc)\
**Replies:** 2\
**Last updated:** [April 24, 2021, 1:17pm UTC](https://discourse.julialang.org/t/ann-fftinterpolations-jl-sinc-interpolation-based-on-ffts/53189 "2021-04-24T13:17:16Z")

</div>

Hey, after looking for a sinc interpolation method based on FFTs, I recently created a small package for it on GitHub which works for both up and downsampling on multi dimensional arrays. There was also a long discussi…

---

## [Compute surfaces of intersection between circles in julia with LibGEOS](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811)

<div class="topic-metadata">

**Author:** [@Meije\_Gawinowski](https://discourse.julialang.org/u/Meije_Gawinowski)\
**Replies:** 4\
**Last updated:** [April 24, 2021, 12:55pm UTC](https://discourse.julialang.org/t/compute-surfaces-of-intersection-between-circles-in-julia-with-libgeos/59811 "2021-04-24T12:55:11Z")

</div>

I need to compute surfaces of intersection between different circles. I am used to do it in R with the sf library and it works fine but I need to do it in Julia with the LibGEOS library and it is not as easy… My first q…

---

## [Creating Package Problem with dependencies](https://discourse.julialang.org/t/creating-package-problem-with-dependencies/59897)

<div class="topic-metadata">

**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 4\
**Last updated:** [April 24, 2021, 12:28pm UTC](https://discourse.julialang.org/t/creating-package-problem-with-dependencies/59897 "2021-04-24T12:28:38Z")

</div>

I am trying to write my code to be in packages, and am having some problems. I have used PkgTemplates to create the package. There seem to be a number of problems that may be related. Which command writes the package …

---

## [\[ANN\] TerminalPager v0.1.0](https://discourse.julialang.org/t/ann-terminalpager-v0-1-0/59910)

<div class="topic-metadata">

**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 6\
**Last updated:** [April 24, 2021, 11:43am UTC](https://discourse.julialang.org/t/ann-terminalpager-v0-1-0/59910 "2021-04-24T11:43:48Z")

</div>

Hi! Last week, I announced the package TerminalPager.jl here. It is targeting a missing feature that would make analysis of data and documentation reading a little bit easier. If you have to print something on the scree…

---

## [How to change font typeface and size in Documentation pane of VSCode?](https://discourse.julialang.org/t/how-to-change-font-typeface-and-size-in-documentation-pane-of-vscode/59925)

<div class="topic-metadata">

**Author:** [@NiclasMattsson](https://discourse.julialang.org/u/NiclasMattsson)\
**Replies:** 2\
**Last updated:** [April 24, 2021, 11:37am UTC](https://discourse.julialang.org/t/how-to-change-font-typeface-and-size-in-documentation-pane-of-vscode/59925 "2021-04-24T11:37:18Z")

</div>

The new Documentation pane of VS Code is great, but for some reason on my machine it displays with an ugly font and at a huge size - very different to what I see in the demos on Youtube. The text size is about 3x the siz…

---

## [Encryption/decryption package](https://discourse.julialang.org/t/encryption-decryption-package/59581)

<div class="topic-metadata">

**Author:** [@Laco\_Kovac](https://discourse.julialang.org/u/Laco_Kovac)\
**Replies:** 9\
**Last updated:** [April 24, 2021, 10:40am UTC](https://discourse.julialang.org/t/encryption-decryption-package/59581 "2021-04-24T10:40:24Z")

</div>

I have quite big String (~20M). It needs to be encrypted and downloaded as a file and then, eventually, uploaded back, decrypted & used. Encryption key or password belongs to the application/server (i.e. it is not specif…

---

## [IJulia 1.6.1 Kernel not showing up in Jupyter](https://discourse.julialang.org/t/ijulia-1-6-1-kernel-not-showing-up-in-jupyter/59923)

<div class="topic-metadata">

**Author:** [@Rodrigo\_PY](https://discourse.julialang.org/u/Rodrigo_PY)\
**Replies:** 2\
**Last updated:** [April 24, 2021, 8:52am UTC](https://discourse.julialang.org/t/ijulia-1-6-1-kernel-not-showing-up-in-jupyter/59923 "2021-04-24T08:52:39Z")

</div>

I just update to 1.6.1. Added IJulia, but still cant see the 1.6.1 kernel in Jupyter. How can I fix it? Thanks

---

## [ANN: Tar.jl](https://discourse.julialang.org/t/ann-tar-jl/32527)

<div class="topic-metadata">

**Author:** [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)\
**Replies:** 20\
**Last updated:** [April 24, 2021, 8:31am UTC](https://discourse.julialang.org/t/ann-tar-jl/32527 "2021-04-24T08:31:45Z")

</div>

I’d like to announce Tar.jl, a pure Julia package for reading and writing POSIX TAR files for the purpose of transmitting trees of files and directories from one system to another. The README should hopefully explain the…

---

## [Realised covariance estimator](https://discourse.julialang.org/t/realised-covariance-estimator/59918)

<div class="topic-metadata">

**Author:** [@Shahal](https://discourse.julialang.org/u/Shahal)\
**Replies:** 1\
**Last updated:** [April 24, 2021, 8:21am UTC](https://discourse.julialang.org/t/realised-covariance-estimator/59918 "2021-04-24T08:21:59Z")

</div>

Hello, is there a code for the realised covariance estimator, rcov in Julia? I understand it is the simplest form of covariance matrix estimation. I wish to estimate the matrix for 10 assets.

---

## [\[ANN\] PyThermo.jl, an interface to the Thermo library for thermophysical properties](https://discourse.julialang.org/t/ann-pythermo-jl-an-interface-to-the-thermo-library-for-thermophysical-properties/58310)

<div class="topic-metadata">

**Author:** [@stillyslalom](https://discourse.julialang.org/u/stillyslalom)\
**Replies:** 10\
**Last updated:** [April 24, 2021, 7:00am UTC](https://discourse.julialang.org/t/ann-pythermo-jl-an-interface-to-the-thermo-library-for-thermophysical-properties/58310 "2021-04-24T07:00:29Z")

</div>

PyThermo may not be the fastest thermophysical property library in the land, but thanks to the tireless efforts of Caleb Bell (the author of the underlying Python library, Thermo), it’s quite thorough. Data is available…

---

## [Filling Areas to Complete a ColorMap](https://discourse.julialang.org/t/filling-areas-to-complete-a-colormap/59851)

<div class="topic-metadata">

**Author:** [@p.sms](https://discourse.julialang.org/u/p.sms)\
**Replies:** 3\
**Last updated:** [April 24, 2021, 5:39am UTC](https://discourse.julialang.org/t/filling-areas-to-complete-a-colormap/59851 "2021-04-24T05:39:28Z")

</div>

Hello People, I am rather new to Julia so I would be very thankful if someone was able to help or guide me, I am trying to plot a 2D grid of 126 3-nodes triangular finite elements with color representing a main strain. …

---

## [Compiling fails with USE\_INTEL\_JITEVENTS, USE\_OPROFILE\_JITEVENTS and USE\_PERF\_JITEVENTS = 1](https://discourse.julialang.org/t/compiling-fails-with-use-intel-jitevents-use-oprofile-jitevents-and-use-perf-jitevents-1/51274)

<div class="topic-metadata">

**Author:** [@Tippit](https://discourse.julialang.org/u/Tippit)\
**Replies:** 3\
**Last updated:** [April 24, 2021, 3:17am UTC](https://discourse.julialang.org/t/compiling-fails-with-use-intel-jitevents-use-oprofile-jitevents-and-use-perf-jitevents-1/51274 "2021-04-24T03:17:56Z")

</div>

First time posting here: I’m building Julia from source to enable external profiling for all three tools The build fails with: /home/tippit/julia/src/init.c: In function ‘\_julia\_init’: /home/tippit/julia/src/init.c:697…

---

## [Avoiding rewriting accessor methods for new composite types with similar fields](https://discourse.julialang.org/t/avoiding-rewriting-accessor-methods-for-new-composite-types-with-similar-fields/59772)

<div class="topic-metadata">

**Author:** [@Benny](https://discourse.julialang.org/u/Benny)\
**Replies:** 7\
**Last updated:** [April 24, 2021, 3:14am UTC](https://discourse.julialang.org/t/avoiding-rewriting-accessor-methods-for-new-composite-types-with-similar-fields/59772 "2021-04-24T03:14:25Z")

</div>

I want to get an idea of the best practices for reusing accessor methods on new composite types with similar fields. The biggest tip for method reuse in general seems to be informal interfaces. When types have dissimilar…

---

## [Multiple dispatch and modules](https://discourse.julialang.org/t/multiple-dispatch-and-modules/59700)

<div class="topic-metadata">

**Author:** [@lambdakappatheta](https://discourse.julialang.org/u/lambdakappatheta)\
**Replies:** 8\
**Last updated:** [April 24, 2021, 2:36am UTC](https://discourse.julialang.org/t/multiple-dispatch-and-modules/59700 "2021-04-24T02:36:48Z")

</div>

After watching Stefan Karpinski’s talk called The Unreasonable Effectiveness of Multiple Dispatch I started wondering how multiple dispatch and modules fit together. To put it simply, if type A is defined in module a an…

---

## [How to filter single subject from dataframe](https://discourse.julialang.org/t/how-to-filter-single-subject-from-dataframe/59793)

<div class="topic-metadata">

**Author:** [@sai\_matcha](https://discourse.julialang.org/u/sai_matcha)\
**Replies:** 8\
**Last updated:** [April 24, 2021, 12:00am UTC](https://discourse.julialang.org/t/how-to-filter-single-subject-from-dataframe/59793 "2021-04-24T00:00:08Z")

</div>

I am started learning julia recently. I am working with a dataset where i want to filter all the rows of single ID in a data frame. can somebody help me to learn this?

---

## [Best way to enforce argument requirements (assert vs. exception, or something else)?](https://discourse.julialang.org/t/best-way-to-enforce-argument-requirements-assert-vs-exception-or-something-else/6293)

<div class="topic-metadata">

**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 3\
**Last updated:** [April 23, 2021, 11:47pm UTC](https://discourse.julialang.org/t/best-way-to-enforce-argument-requirements-assert-vs-exception-or-something-else/6293 "2021-04-23T23:47:29Z")

</div>

I have a function that expects a positive number as argument, for example: f(x) = sqrt(x) I want to be safe about this, so I want to throw an error if x \< 0. Currently I do an assert: function f(x) @assert x \>= 0 …

---

## [Updating Julia from 1.6 to 1.6.1](https://discourse.julialang.org/t/updating-julia-from-1-6-to-1-6-1/59907)

<div class="topic-metadata">

**Author:** [@Rodrigo\_PY](https://discourse.julialang.org/u/Rodrigo_PY)\
**Replies:** 2\
**Last updated:** [April 23, 2021, 11:44pm UTC](https://discourse.julialang.org/t/updating-julia-from-1-6-to-1-6-1/59907 "2021-04-23T23:44:31Z")

</div>

Hello, How do I update from 1.6 to 1.6.1 without losing all the packages I already have? I am on Linux. Thanks

---

## [Save animation makie](https://discourse.julialang.org/t/save-animation-makie/59879)

<div class="topic-metadata">

**Author:** [@boroboro77](https://discourse.julialang.org/u/boroboro77)\
**Replies:** 5\
**Last updated:** [April 23, 2021, 11:28pm UTC](https://discourse.julialang.org/t/save-animation-makie/59879 "2021-04-23T23:28:02Z")

</div>

I am trying to save an animation using Makie.jl. I have no clue how this should work using the record method. I manage to see the animated output in the popup, but I can nowhere find the output as an “.mp4” with the fil…

---

## [Generated documentation for function modifies alignment of "unicode art"](https://discourse.julialang.org/t/generated-documentation-for-function-modifies-alignment-of-unicode-art/59888)

<div class="topic-metadata">

**Author:** [@PeterSimon](https://discourse.julialang.org/u/PeterSimon)\
**Replies:** 2\
**Last updated:** [April 23, 2021, 10:26pm UTC](https://discourse.julialang.org/t/generated-documentation-for-function-modifies-alignment-of-unicode-art/59888 "2021-04-23T22:26:05Z")

</div>

I’m working on publishing the documentation for a new package PSSFSS using Documenter.jl. Several of the function docstrings use “unicode art” to define the planar geometry and how it is parameterized (example below). …

---

## [Error building TimeZones on hpc](https://discourse.julialang.org/t/error-building-timezones-on-hpc/59893)

<div class="topic-metadata">

**Author:** [@mkarikom](https://discourse.julialang.org/u/mkarikom)\
**Replies:** 2\
**Last updated:** [April 23, 2021, 9:43pm UTC](https://discourse.julialang.org/t/error-building-timezones-on-hpc/59893 "2021-04-23T21:43:08Z")

</div>

For some reason this works fine locally, but fails on hpc: (DTMwork) pkg\> build TimeZones Building TimeZones → \`~/.julia/scratchspaces/44cfe95a-1eb2-52ea-b672-e2afdf69b78f/4ba8a9579a243400db412b50300cd61d7447e583/bu…

[Previous page](https://discourse.julialang.org/latest.md?page=1412)

[Next page](https://discourse.julialang.org/latest.md?page=1414)