How to correctly handle one-element array vs scalar
I have a statement in my code where I need to compute the mean of an ND array A along the 1st dimension, which is M = mean(A,dims=1); However, sometimes A is just a scalar, in which case an error will...
View ArticleZygote in Turing: Mutating arrays is not supported
I am trying to use Zygote in Turing. Here’s my MWE @model function mwe(B, ::Type{T} = Vector{Float64}) where {T} μ = mapslices(lsexp, B; dims=[1])[1,:] end mwe_model = mwe([1.0 2; 3 4]) mwe_ch =...
View ArticleMost efficient way to delete row without memory consuming
Would you suggest, how to delete row without consuming memory? I try the code but have not enough memory error. df = df[df.cl!=1,:] thank you in advance. 1 post - 1 participant Read full topic
View ArticleReduce: init for non-empty collections
I noticed that the docs for reduce say: reduce(op, itr; [init]) ... If provided, the initial value init must be a neutral element for op that will be returned for empty collections. It is unspecified...
View ArticleGlade developed window not showing in compile but showing at julia prompt
Hi, Here is a sample of the code I am using to display a glade developed window. using Gtk, Gtk.ShortNames b = GtkBuilder(filename="/home/user/Documents/projects/Julia/gladeProjects/app.glade") win =...
View ArticleIncorrect display of Array{Float64,2} numbers
Dear all, I am just starting to use Julia and I run into the following issue [Julia Version 1.4.1 (2020-04-14)]: julia> arr = [-498796.2749933266 408222.59838380764 -583210.404155956...
View ArticleNewbie question about loop fusion and broadcasting
Dear JuliaLang, I’m excited to get started with Julia as a long-time Python user, tired of typing np.array. One thing that is really exciting to me is the ability to avoid writing my own ufuncs,...
View ArticleI need help creating a macro that makes Julia evaluate my floating point...
I need a macro that takes any expression matching r"-?[0-9]+\Q.\E[0-9]+", and encloses it in a BigFloat constructor. For example, a macro that receives the source code below: @my_macro function f()...
View ArticleWhat is the expected behavior for metapackages?
Wherein I attempt to install StatsKit: (@v1.4) pkg> add StatsKit Updating registry at `C:\Users\alanc\.julia\registries\General` Updating git-repo `https://github.com/JuliaRegistries/General.git`...
View ArticleCreating a Weighted Graph
I would like to try using a weighted graph. To this end, I added SimpleWeightedGraphs to Atom, created an erdos_renyi directed graph, and then applied SimpleWeightedGraphs to this graph. const G =...
View ArticleFresh Arch Linux install: UndefVarError: backend not defined
I just created a new Arch Linux install, and while on my old Arch Linux install my Julia scripts run fine, on this fresh install this one keeps returning the error: UndefVarError: backend not defined...
View ArticleI define t, then in a loop I'm told it's undefined, why?
I’ve written a Julia script that should be using Simpson’s rule to approximate the solution to: \displaystyle \int_0^{-\pi} \dfrac{dy}{\sqrt{-\frac{2g}{l} \sin{y}}} and compare it to the result...
View ArticleParallelizing a histogram
I am trying to parallelize a simple histogram: n_bins = 20000000 n_elem = 100000000 hist = zeros(Int64, n_bins) for i = 1:n_elem bin = rand(UInt64)%n_bins + 1 hist[bin] += 1 end In Fortran&OpenMP...
View ArticleBenchmarkTools keep failing in a loop
I am trying to use BenchmarkTools to benchmark some of my algorithms but I keep getting an error I don’t really understand. Why does it keep failing in a loop? I think the @benchmark macro isn’t a...
View ArticleUsing replace with a function of the match
Hello, It’s easy to recuperate the matched substring in replace and do something like: julia> replace("foobar", r"b([a-z])r" => s"\1") "fooa" However I can’t pass the output to a function so for...
View ArticleTrying to code a parallel for loop with shared sparse arrays
Having asked here how to code a parallel for loop, and getting a nice answer, I now find myself unable to find anything on how to do it with sparse arrays, as I couldn’t work out how to use sparse...
View ArticleHow to declare a Boolean variable?
I need to declare a Boolean variable but I don’t know how to use Bool. How should I do ? I need the variable “i” to assume two values (1, 0) using JuMP, Cbc Model1 =...
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Trying to install Jupyter notebooks via JuliaPro
I have some students who are trying to install Jupyter notebooks to be used with JuliaPro, and one of them is running into an installation problem that I can’t figure out. She is using Windows 10, and...
View ArticleProblem creating violin plots
Hi all, I’m new to Julia and I’m hoping to make some violin plots. I recently had version 1.1.1 downloaded and I found some sample code to create a violin plot using StatsPlots y = rand(100, 4) # Four...
View ArticleJulia save ".rdata" equivalent
I can’t find a consensus for what would be a good .rdata file equivalent. I like rdata files because they are very compact and I can throw multiple objects into them. Any suggestions? 2 posts - 2...
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