Converting CSV to Parquet in Julia
Hi. I have a simple dataframe that I want to convert to parquet. This is my attempt: begin df = CSV.read("/home/onur/julia-assignment/temp.csv", DataFrame) prq = Parquet.File(df) end But this is the...
View ArticleShow the full error stacktrace in REPL and pipe it to a file?
Once an error occurs and the REPL shows the error and the stacktrace, is there a good way to record it and pipe/record it to a file just from the REPL? julia> myFunction() ERROR: Error in module....
View ArticlePkg.TOML.ParserError
Hi, I’ve been using Julia without issue for 6+ months. A few weeks ago I turned my computer in for a SSD upgrade, resulting in a fresh install of Win10 (and therefore Julia). I am now seeing...
View ArticleWant to generate samples with all items being sampled the same number of times?
Is there any library that can help me generate random “batches” of data such that every item appears in the same number of batches (with the exception that some items may appear one more time than...
View ArticleIs "import" required for user-defined modules?
When using modules, is “import” or “using” needed? The reason I ask is that in the following toy example, according to my reading of the documentation, an “import” (or “using”) statement is required....
View ArticleUnion{Some{T}, Nothing} behaviour
I cannot figure out how to obtain a non-nothing output from the following code. julia> struct B a::Union{Some{T}, Nothing} where {T<:Integer} end julia> b = B(nothing) B(nothing) julia> b...
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How to use a function to retrieve a single row of data from Parquet
Hi. I have a dataframe like this: data1336×710 41.1 KB I want to be able to get the numerical data for a single row, say, “Algeria”. This is the function that I wrote for that. function...
View ArticleHow to debug "Local instance of remote reference not found"?
I tried to make a self-contained MWE but can’t replicate the error. For some reason it doesn’t like the @sync: @sync @distributed for d in 1:ndocs...
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VS Code: Julia Env different in status bar and REPL
As title already says, why does VC Code show two different activatated envs? I want to work in Oceananigans instead of in v1.5 but the REPL doesnt change. 11 posts - 2 participants Read full topic
View ArticleTwinx shows left yticks on right y axis
I am struggling to generate a plot with two y-axes. The left y-ticks show up on the right y-axis. Also, I am uisng rightmargin = 1.5Plots.cm, box = :on because the label margins are broken. using...
View ArticleHow to write type-stable dataflow graphs
I’m trying to implement a dataflow graph for basic arithmetic and encountering type instability for all but trivially simple graphs. How to rewrite this in a type-stable way? module Inst # for...
View ArticleCan I install Plots without GR
Currently, when I Pkg.add("Plots"), GR is also installed and built. And if GR is not correctly built, which usual due to network issue, using Plots may fail because GR will also be imported. I know I...
View ArticleHow to 'using a_local_module'
In a project directory, I have a main.jl and a myModule.jl myModule.jl. contains module myModule … end In the main.jl, how do I use myModule ? using myModule and import myModule both are for modules...
View ArticleNon-diagonal noise correlation matrix
Hi all! I am newbie to julia and I am playing with it to solve SDE systems, numerically. I had a look at Non-diagonal noise Tutorial (Example No. 4)...
View ArticleStruct variables explicit setting
Hi! I know how to do this: struct a a1 a2 a3 end b=a(1,2,3) I was wondering if there’s a way to do this in a more explicit way. Something like: b=a(a1=1,a2=2,a3=3). The reason would be readability (so...
View ArticlePerformance disadvantages of structs?
Hello, I have a lot of large arrays (matrices of floats, vectors of floats, vectors of StaticArrays of floats, vectors of StaticArrays of ints) in my code and calling functions is becoming cumbersome,...
View ArticleDisplaying a parquet file in Arrow
Hi. I am trying to add a Parquet file into Arrow. I tried to follow the Arrow.jl docs and implement it like this: begin df = CSV.read("/home/onur/julia-assignment/temp.csv", DataFrame) file = file =...
View ArticleMutable scalar in immutable object: the best alternative?
I found this old thread about the same thing, but that was before 1.0. Actually while writing this post I figured out most of the details… now I will post it anyway. If one has an immutable struct...
View ArticleUpdate Julia Package in Jupyter notebook
Hello I have added ODE package in Julia and i tried to work in jupyter notebook env but still iam getting the error as install ODE How would i resolve it. Pls help me 2 posts - 2 participants Read...
View ArticleFinding unique coluns of a matrix
Dear all, I have a matrix A: A = [ 1.0 0.0 0.0 0.0 1.0 1.0 3.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.0 1.0 0.0 0.0 0.0 1.0 11.0 0.0 0.0 0.0 1.0 0.0 6.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 12.0...
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Signing the points were 2 functions are equal
Hello, there! I’m working with some numerical calculations, plotting 2 diferent functions as follows: using Plots h=0 K=1.5 g(y) = y j(y) = tanh(K*y+h)...
View ArticlePlot group size after running groupby
I have a DataFrame with a :group column and did a gb = groupby(df, :group) I would like to plot the group sizes vs. group id. For example, for group gb[1] on the x-axis I would like to plot...
View ArticleWhat is the most efficient binary representation of unsigned integers in Julia?
Hello everybody, I would like to know what is the most efficient binary representation in Julia? My use case is to convert an unsigned integer into a binary representation, then to mutate the elements...
View ArticleMake function accept an array of strings and return an array of strings
I’m working on a google translate package, and I’ve got the translating part, but I want a function that will do a batch translate. function batchtranslate(inputstrings::Array{String,1},...
View ArticlePreprocessing function arguments
I have a working code like the following: function test(a,b) c = a + b d = a - b e = c + 2 * d end but I now want to sometimes make b a constant s.t. const b = 1.5 function test(a) c = a + b d = a - b...
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