# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1849

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

**Page:** 1850

---

## [Faster read only memory](https://discourse.julialang.org/t/faster-read-only-memory/32457)

<div class="topic-metadata">

**Author:** [@Michael\_Benton](https://discourse.julialang.org/u/Michael_Benton)\
**Replies:** 5\
**Last updated:** [January 8, 2020, 6:50am UTC](https://discourse.julialang.org/t/faster-read-only-memory/32457 "2020-01-08T06:50:57Z")

</div>

I’ve got something that works, but it needs to work faster. I’ve tested different methods outside of Julia that can do this much faster, and by comparison with peakflops.jl and a rudimentary calculation of how many opera…

---

## [Accidental overwrite base function name](https://discourse.julialang.org/t/accidental-overwrite-base-function-name/33080)

<div class="topic-metadata">

**Author:** [@Egwene\_al\_Vere](https://discourse.julialang.org/u/Egwene_al_Vere)\
**Replies:** 2\
**Last updated:** [January 8, 2020, 2:04am UTC](https://discourse.julialang.org/t/accidental-overwrite-base-function-name/33080 "2020-01-08T02:04:16Z")

</div>

Not sure if it’s a bug or expected behavior: people may not know all the names of the built-in functions, and on a fresh start, the built-in function may be overwritten: on a fresh start, things like diff = 0 would run…

---

## [Error building "pycall"](https://discourse.julialang.org/t/error-building-pycall/16270)

<div class="topic-metadata">

**Author:** [@lannisite110](https://discourse.julialang.org/u/lannisite110)\
**Replies:** 10\
**Last updated:** [January 8, 2020, 12:56am UTC](https://discourse.julialang.org/t/error-building-pycall/16270 "2020-01-08T00:56:51Z")

</div>

Error: Error building PyCall: │ ERROR: LoadError: UndefVarError: v not defined │ Stacktrace: │ \[1\] find\_libpython(::String) at /home/users/xdlan/.julia/packages/PyCall/0jMpb/deps/build.jl:101 │ \[2\] top-level scope …

---

## [Question on boundary conditions in DiffEqOperators.jl for 2D-case](https://discourse.julialang.org/t/question-on-boundary-conditions-in-diffeqoperators-jl-for-2d-case/33079)

<div class="topic-metadata">

**Author:** [@Eben60](https://discourse.julialang.org/u/Eben60)\
**Replies:** 0\
**Last updated:** [January 7, 2020, 8:46pm UTC](https://discourse.julialang.org/t/question-on-boundary-conditions-in-diffeqoperators-jl-for-2d-case/33079 "2020-01-07T20:46:47Z")

</div>

I just started to play around with DiffEqOperators. I’d like to extend the example at https://github.com/JuliaDiffEq/DiffEqOperators.jl/blob/master/examples/poisson.jl to a 2D case. Here is the adapted code: using Dif…

---

## [GMT.jl GPS points plotting](https://discourse.julialang.org/t/gmt-jl-gps-points-plotting/33047)

<div class="topic-metadata">

**Author:** [@Dervis](https://discourse.julialang.org/u/Dervis)\
**Replies:** 1\
**Last updated:** [January 7, 2020, 8:38pm UTC](https://discourse.julialang.org/t/gmt-jl-gps-points-plotting/33047 "2020-01-07T20:38:25Z")

</div>

Dear all, I would like to plot the GPS points (latitude and longitude) on satellite map similar to this: If anyone knows any other packages rather than GMT.jl, that would be appreciated. Thank you.

---

## [First Julia Meet Up for Washington DC Greater Metro Area](https://discourse.julialang.org/t/first-julia-meet-up-for-washington-dc-greater-metro-area/33077)

<div class="topic-metadata">

**Author:** [@Nosferican](https://discourse.julialang.org/u/Nosferican)\
**Replies:** 0\
**Last updated:** [January 7, 2020, 8:06pm UTC](https://discourse.julialang.org/t/first-julia-meet-up-for-washington-dc-greater-metro-area/33077 "2020-01-07T20:06:28Z")

</div>

I wanted to invite those interested in attending a Julia meet up group in the Washington DC greater metro area. People may register for the event at About this Event Learn about the Julia language: the basics, why it is…

---

## [How to align output in columns?](https://discourse.julialang.org/t/how-to-align-output-in-columns/3938)

<div class="topic-metadata">

**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 8\
**Last updated:** [January 7, 2020, 7:47pm UTC](https://discourse.julialang.org/t/how-to-align-output-in-columns/3938 "2020-01-07T19:47:39Z")

</div>

I have the following script: println("n \\t n! \\t\\t Approximation \\t\\t Ratio") for n in 1:10 fact = factorial(big(n)) stir = n^n \* exp(-n) \* sqrt(2 \* π \* n ) ratio = Float32(fact/stir) println("$n \\t $…

---

## [Exception calling "DownloadFile" with "2" argument(s): "The remote server returned an error: (403) Forbidden](https://discourse.julialang.org/t/exception-calling-downloadfile-with-2-argument-s-the-remote-server-returned-an-error-403-forbidden/32929)

<div class="topic-metadata">

**Author:** [@yuxi.liu](https://discourse.julialang.org/u/yuxi.liu)\
**Replies:** 4\
**Last updated:** [January 7, 2020, 7:35pm UTC](https://discourse.julialang.org/t/exception-calling-downloadfile-with-2-argument-s-the-remote-server-returned-an-error-403-forbidden/32929 "2020-01-07T19:35:09Z")

</div>

I got this error while installing Blink AtomShell: julia\> Blink.AtomShell.install() Exception calling "DownloadFile" with "2" argument(s): "The remote server returned an error: (403) Forbidden." At line:1 char:82 + ... …

---

## [Do you know the owner of the GitHub org JuliaClimate?](https://discourse.julialang.org/t/do-you-know-the-owner-of-the-github-org-juliaclimate/33066)

<div class="topic-metadata">

**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 1\
**Last updated:** [January 7, 2020, 7:09pm UTC](https://discourse.julialang.org/t/do-you-know-the-owner-of-the-github-org-juliaclimate/33066 "2020-01-07T19:09:35Z")

</div>

Hi there, we are thinking of starting a more frontend-oriented organization, that complements JuliaGeo, following e.g. the discussions in this post, this Issue and various other discussions spread across slack etc. The…

---

## [Plot Optim trace/error convergence](https://discourse.julialang.org/t/plot-optim-trace-error-convergence/32632)

<div class="topic-metadata">

**Author:** [@Andre\_Mello](https://discourse.julialang.org/u/Andre_Mello)\
**Replies:** 9\
**Last updated:** [January 7, 2020, 6:43pm UTC](https://discourse.julialang.org/t/plot-optim-trace-error-convergence/32632 "2020-01-07T18:43:46Z")

</div>

Hi, all. I’m using Optim.jl to solve an optimization problem and I want to plot its trace/error convergence. However I have some issues and I couldn’t find much info on that so far. Just to make things clearer, I want …

---

## [Thinking about buying a multicore system of ebay. Would appreciate any thoughts or experiences](https://discourse.julialang.org/t/thinking-about-buying-a-multicore-system-of-ebay-would-appreciate-any-thoughts-or-experiences/32800)

<div class="topic-metadata">

**Author:** [@anon69491625](https://discourse.julialang.org/u/anon69491625)\
**Replies:** 40\
**Last updated:** [January 7, 2020, 6:38pm UTC](https://discourse.julialang.org/t/thinking-about-buying-a-multicore-system-of-ebay-would-appreciate-any-thoughts-or-experiences/32800 "2020-01-07T18:38:23Z")

</div>

So I’m headed into multithreading and want to put as many threads up as possible. I am considering buying the system below and would appreciate any experiences or guidance on the environment. I cannot be the first to tre…

---

## [Is there a Julia equivalent for python's .remove() function?](https://discourse.julialang.org/t/is-there-a-julia-equivalent-for-pythons-remove-function/33031)

<div class="topic-metadata">

**Author:** [@aschimmichanga](https://discourse.julialang.org/u/aschimmichanga)\
**Replies:** 14\
**Last updated:** [January 7, 2020, 6:26pm UTC](https://discourse.julialang.org/t/is-there-a-julia-equivalent-for-pythons-remove-function/33031 "2020-01-07T18:26:42Z")

</div>

I have tried deleteat!(arr, findfirst(item,arr)) but it gives me an error. Is it deprecated?

---

## [Alarming incorrect computation in Flux / Juno?](https://discourse.julialang.org/t/alarming-incorrect-computation-in-flux-juno/33017)

<div class="topic-metadata">

**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 6\
**Last updated:** [January 7, 2020, 6:23pm UTC](https://discourse.julialang.org/t/alarming-incorrect-computation-in-flux-juno/33017 "2020-01-07T18:23:43Z")

</div>

have a look at this bug https://github.com/FluxML/Flux.jl/issues/982 Am I correct in thinking that is is really serious error? Conv gives not repeatable, quite reandom results. I was able to repeat the bug running in…

---

## [SASLib v1.1.0 release](https://discourse.julialang.org/t/saslib-v1-1-0-release/32959)

<div class="topic-metadata">

**Author:** [@tk3369](https://discourse.julialang.org/u/tk3369)\
**Replies:** 8\
**Last updated:** [January 7, 2020, 5:10pm UTC](https://discourse.julialang.org/t/saslib-v1-1-0-release/32959 "2020-01-07T17:10:58Z")

</div>

Hi all, I have just tagged a new major version of SASLib. I took the chance to migrate version number to 1.x, as the library/API has been stable and unchanged for quite a while. The main updates are: Fully adopt Juli…

---

## [Testing modifications to Base](https://discourse.julialang.org/t/testing-modifications-to-base/33063)

<div class="topic-metadata">

**Author:** [@tro3](https://discourse.julialang.org/u/tro3)\
**Replies:** 5\
**Last updated:** [January 7, 2020, 4:45pm UTC](https://discourse.julialang.org/t/testing-modifications-to-base/33063 "2020-01-07T16:45:55Z")

</div>

Do I recall on one of these threads that there is a way to easily test Base modifications without rebuilding Julia? Can’t find it through search, so maybe my memory is off…

---

## [Five-argument mul! C](https://discourse.julialang.org/t/five-argument-mul-c/33068)

<div class="topic-metadata">

**Author:** [@Paul\_Soderlind](https://discourse.julialang.org/u/Paul_Soderlind)\
**Replies:** 2\
**Last updated:** [January 7, 2020, 3:55pm UTC](https://discourse.julialang.org/t/five-argument-mul-c/33068 "2020-01-07T15:55:00Z")

</div>

mul! on 1.3.1 does not update x\[:,:,1\] in x = zeros(2,2,2) mul!(x\[:,:,1\],\[1,1\],\[1 2\],1.0,1.0) In contrast, it does update x\[1\] in x = \[zeros(2,2) for i=1:2\] mul!(x\[1\],\[1,1\],\[1 2\],1.0,1.0) Is this difference obvious?

---

## [Converting String to Datatype with Meta.parse](https://discourse.julialang.org/t/converting-string-to-datatype-with-meta-parse/33024)

<div class="topic-metadata">

**Author:** [@YongHee-Kim](https://discourse.julialang.org/u/YongHee-Kim)\
**Replies:** 8\
**Last updated:** [January 7, 2020, 1:30pm UTC](https://discourse.julialang.org/t/converting-string-to-datatype-with-meta-parse/33024 "2020-01-07T13:30:48Z")

</div>

I’ve made a package to create JSONPointer from a string, then construct the Dictionary from JSONPointer data. But I’ve added extra functionality to define static type for JSONPointer. here is example pkg\>add XLSXasJSO…

---

## [Quantile regression in Flux v0.10](https://discourse.julialang.org/t/quantile-regression-in-flux-v0-10/32382)

<div class="topic-metadata">

**Author:** [@johnbb](https://discourse.julialang.org/u/johnbb)\
**Replies:** 10\
**Last updated:** [January 7, 2020, 12:18pm UTC](https://discourse.julialang.org/t/quantile-regression-in-flux-v0-10/32382 "2020-01-07T12:18:23Z")

</div>

I am trying various quantile regression methods using Flux, but after upgrading to Julia v1.3.0 and Flux v0.10 I am experiencing problems. For example, the following example code no longer works using Flux, Statistics, …

---

## [Clean Julia 1.0 install on Arch Linux -- Can't add packages](https://discourse.julialang.org/t/clean-julia-1-0-install-on-arch-linux-cant-add-packages/16931)

<div class="topic-metadata">

**Author:** [@tealeaf](https://discourse.julialang.org/u/tealeaf)\
**Replies:** 13\
**Last updated:** [January 7, 2020, 10:16am UTC](https://discourse.julialang.org/t/clean-julia-1-0-install-on-arch-linux-cant-add-packages/16931 "2020-01-07T10:16:19Z")

</div>

As a long-time R user, I’ve been intending to play with Julia for some time. Seeing the 1.0 release, I installed it on my Arch Linux machine but seem to be having an odd error, which Google isn’t helping me resolve. My …

---

## [Working efficiently with sparse variables in JuMP](https://discourse.julialang.org/t/working-efficiently-with-sparse-variables-in-jump/32240)

<div class="topic-metadata">

**Author:** [@hellemo](https://discourse.julialang.org/u/hellemo)\
**Replies:** 10\
**Last updated:** [January 7, 2020, 10:12am UTC](https://discourse.julialang.org/t/working-efficiently-with-sparse-variables-in-jump/32240 "2020-01-07T10:12:22Z")

</div>

After using JuMP mostly for smaller, nonlinear problems, I did some testing for larger LP/MILP models, and noticed that one can easily get a performance hit in problem creation when there are many sparse variables (a com…

---

## [Seriously incorrect computation in Juno REPL?](https://discourse.julialang.org/t/seriously-incorrect-computation-in-juno-repl/33050)

<div class="topic-metadata">

**Author:** [@jaynick](https://discourse.julialang.org/u/jaynick)\
**Replies:** 2\
**Last updated:** [January 7, 2020, 8:21am UTC](https://discourse.julialang.org/t/seriously-incorrect-computation-in-juno-repl/33050 "2020-01-07T08:21:52Z")

</div>

See this https://discourse.julialang.org/t/alarming-incorrect-computation-in-flux-juno/33017 But I am flagging it here because it seems to be a problem in Juno, and is very serious. Someone here should have a look as w…

---

## [\[ANN\] SpineBaseRecordLinkage.jl](https://discourse.julialang.org/t/ann-spinebaserecordlinkage-jl/33045)

<div class="topic-metadata">

**Author:** [@jocklawrie](https://discourse.julialang.org/u/jocklawrie)\
**Replies:** 1\
**Last updated:** [January 7, 2020, 12:02am UTC](https://discourse.julialang.org/t/ann-spinebaserecordlinkage-jl/33045 "2020-01-07T00:02:23Z")

</div>

Hi all, Announcing SpineBasedRecordLinkage.jl, which links a set of tables to a central table known as a spine. If the spine doesn’t already exist the package will construct it from the input tables. The package provid…

---

## [Integer overflow in cumprod (cumulative product) output](https://discourse.julialang.org/t/integer-overflow-in-cumprod-cumulative-product-output/33037)

<div class="topic-metadata">

**Author:** [@1634](https://discourse.julialang.org/u/1634)\
**Replies:** 4\
**Last updated:** [January 6, 2020, 10:45pm UTC](https://discourse.julialang.org/t/integer-overflow-in-cumprod-cumulative-product-output/33037 "2020-01-06T22:45:14Z")

</div>

The cumulative product vector of a series of linear positive numbers (show in plot(cump1) ) contains negative num and zeros(in plot(cump2)). I checked available documentations carefully and still was in dark. twoNmu=1;n…

---

## [Subtyping Conventions for Dicts are Unexpected](https://discourse.julialang.org/t/subtyping-conventions-for-dicts-are-unexpected/33040)

<div class="topic-metadata">

**Author:** [@chelseas](https://discourse.julialang.org/u/chelseas)\
**Replies:** 7\
**Last updated:** [January 6, 2020, 9:30pm UTC](https://discourse.julialang.org/t/subtyping-conventions-for-dicts-are-unexpected/33040 "2020-01-06T21:30:08Z")

</div>

If Int64 \<: Real is true, and I presume Julia follows normal function typing rules (for dicts) where the “return” type can be more specific than indicated by the type annotation, why isn’t the following true? Dict(:x…

---

## [DelimitedFiles:writedlm usage](https://discourse.julialang.org/t/delimitedfiles-writedlm-usage/33009)

<div class="topic-metadata">

**Author:** [@tanya](https://discourse.julialang.org/u/tanya)\
**Replies:** 17\
**Last updated:** [January 6, 2020, 9:51pm UTC](https://discourse.julialang.org/t/delimitedfiles-writedlm-usage/33009 "2020-01-06T21:51:28Z")

</div>

with using DelimitedFiles What would be the equivalent of matlab command dlmwrite(‘filename.csv’,arrayname,‘delimiter’,‘,’,‘-append’) ? Basically, I need to write to the same csv file and append the existing data. wri…

---

## [Key and value from Dictionary](https://discourse.julialang.org/t/key-and-value-from-dictionary/33043)

<div class="topic-metadata">

**Author:** [@ar12y](https://discourse.julialang.org/u/ar12y)\
**Replies:** 2\
**Last updated:** [January 6, 2020, 9:44pm UTC](https://discourse.julialang.org/t/key-and-value-from-dictionary/33043 "2020-01-06T21:44:15Z")

</div>

Hi, I have the following Dictionary called states: states=Dict{Any,Any}((0, 0) =\> Array{Any,1}\[\[\[0\], (0, 0), Any\[0, 0\]\], \[\[1\], (1, 0), Any\[1, 1\]\]\],(1, 0) =\> Array{Any,1}\[\[\[0\], (0, 1), Any\[1, 0\]\], \[\[1\], (1, 1), Any\[0, 1\]…

---

## [How to change the type of a variable for a loaded table?](https://discourse.julialang.org/t/how-to-change-the-type-of-a-variable-for-a-loaded-table/32973)

<div class="topic-metadata">

**Author:** [@kai](https://discourse.julialang.org/u/kai)\
**Replies:** 11\
**Last updated:** [January 6, 2020, 9:34pm UTC](https://discourse.julialang.org/t/how-to-change-the-type-of-a-variable-for-a-loaded-table/32973 "2020-01-06T21:34:36Z")

</div>

I’m trying to use JuliaDB to load tables and then use MixedModels to fit models. The MixedModels package requires the clustering variable “id” to be categorical, but in my dataset “id” is integer. So my question is, ho…

---

## [sIpopt extension in JuMP?](https://discourse.julialang.org/t/sipopt-extension-in-jump/32899)

<div class="topic-metadata">

**Author:** [@mandart](https://discourse.julialang.org/u/mandart)\
**Replies:** 6\
**Last updated:** [January 6, 2020, 9:29pm UTC](https://discourse.julialang.org/t/sipopt-extension-in-jump/32899 "2020-01-06T21:29:05Z")

</div>

Hi, is there a way to use the sIpopt extension to Ipopt (https://projects.coin-or.org/Ipopt/wiki/sIpopt) within JuMP? I can set up a JuMP model with a call to the AMPL sIpopt executable using AmplNLWriter.jl. However, s…

---

## [How to drop the dropout layers in Flux.jl when assessing model performance](https://discourse.julialang.org/t/how-to-drop-the-dropout-layers-in-flux-jl-when-assessing-model-performance/19924)

<div class="topic-metadata">

**Author:** [@xiaodai](https://discourse.julialang.org/u/xiaodai)\
**Replies:** 2\
**Last updated:** [January 6, 2020, 5:59pm UTC](https://discourse.julialang.org/t/how-to-drop-the-dropout-layers-in-flux-jl-when-assessing-model-performance/19924 "2020-01-06T17:59:54Z")

</div>

I was playing around with the Flux.jl framework and I fitted a model with dropouts at every layer. using Flux, Flux.Data.MNIST, Statistics using Flux: onehotbatch, onecold, crossentropy, throttle using Base.Iterators: r…

---

## [Fortuna random number generator](https://discourse.julialang.org/t/fortuna-random-number-generator/33030)

<div class="topic-metadata">

**Author:** [@mleisher](https://discourse.julialang.org/u/mleisher)\
**Replies:** 2\
**Last updated:** [January 6, 2020, 5:28pm UTC](https://discourse.julialang.org/t/fortuna-random-number-generator/33030 "2020-01-06T17:28:15Z")

</div>

I whipped up a Fortuna RNG (generator only, no entropy accumulator and seed file yet) and being fairly new to Julia, am looking for performance improvement suggestions. New feature suggestions are welcome as well, but th…

[Previous page](https://discourse.julialang.org/latest.md?page=1848)

[Next page](https://discourse.julialang.org/latest.md?page=1850)