# Latest

**URL:** https://discourse.julialang.org/latest.md?page=1604

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

**Page:** 1605

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## [Convert DataFrame timestamp column to Data Type and split Date and Hour](https://discourse.julialang.org/t/convert-dataframe-timestamp-column-to-data-type-and-split-date-and-hour/48270)

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**Author:** [@JohnFlorez25](https://discourse.julialang.org/u/JohnFlorez25)\
**Replies:** 1\
**Last updated:** [October 13, 2020, 2:01am UTC](https://discourse.julialang.org/t/convert-dataframe-timestamp-column-to-data-type-and-split-date-and-hour/48270 "2020-10-13T02:01:44Z")

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Hello everybody, I need to Convert DataFrame timestamp column to Data Type and split Date and Hour, I have this column: I try to use the function unix2datetime(x) but I don’t know how we can do with a column in a Dat…

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## [How to start Partial Differential Equation (PDE) Solving in Julia for modified Wave Equation](https://discourse.julialang.org/t/how-to-start-partial-differential-equation-pde-solving-in-julia-for-modified-wave-equation/46555)

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**Author:** [@CosmoProf](https://discourse.julialang.org/u/CosmoProf)\
**Replies:** 50\
**Last updated:** [October 12, 2020, 11:40pm UTC](https://discourse.julialang.org/t/how-to-start-partial-differential-equation-pde-solving-in-julia-for-modified-wave-equation/46555 "2020-10-12T23:40:05Z")

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Hi, after working with ordinary differential equations so far, I now have to numerically solve a partial differential equation (PDE) in Julia, and I’m not sure where to start. My equation is like the usual wave equation…

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## [Bootstrap error when compiling julia master](https://discourse.julialang.org/t/bootstrap-error-when-compiling-julia-master/48258)

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**Author:** [@Palli](https://discourse.julialang.org/u/Palli)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 10:53pm UTC](https://discourse.julialang.org/t/bootstrap-error-when-compiling-julia-master/48258 "2020-10-12T22:53:01Z")

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I compiled Julia days ago, and now after git checkout master and git pull it doesn’t work. I tried make, then make clean, then make cleanall: combinatorics.jl error during bootstrap: LoadError("sysimg.jl", 3, LoadError…

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## [Low usage of TypedTables.jl](https://discourse.julialang.org/t/low-usage-of-typedtables-jl/47881)

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**Author:** [@lewis](https://discourse.julialang.org/u/lewis)\
**Replies:** 16\
**Last updated:** [October 12, 2020, 10:23pm UTC](https://discourse.julialang.org/t/low-usage-of-typedtables-jl/47881 "2020-10-12T22:23:39Z")

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My specific question is whether TypedTables will continue to be maintained and whether it may be a risk to use it for my project or not. This comes at the bottom after explaining the peculiarities of why it seems advant…

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## [Saving vegalite plots takes very long time compared to plots.jl](https://discourse.julialang.org/t/saving-vegalite-plots-takes-very-long-time-compared-to-plots-jl/48232)

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**Author:** [@MackHarry](https://discourse.julialang.org/u/MackHarry)\
**Replies:** 10\
**Last updated:** [October 12, 2020, 9:41pm UTC](https://discourse.julialang.org/t/saving-vegalite-plots-takes-very-long-time-compared-to-plots-jl/48232 "2020-10-12T21:41:31Z")

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Hello everyone, first time poster here. I’m running into problems when trying to save vegalite plots as pdf, or anything other than html for that matter. The following script exemplifies this quite well: using VegaLit…

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## [DEBUG JULIA\_COPY\_STACKS on Windows](https://discourse.julialang.org/t/debug-julia-copy-stacks-on-windows/48180)

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**Author:** [@mkitti](https://discourse.julialang.org/u/mkitti)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 8:52pm UTC](https://discourse.julialang.org/t/debug-julia-copy-stacks-on-windows/48180 "2020-10-12T20:52:48Z")

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Using JULIA\_COPY\_STACKS=1 causes Julia to crash for me in Windows. My interest with JULIA\_COPY\_STACKS is for developing multithreading capabilities with JavaCall.jl. Using JULIA\_COPY\_STACKS=1 works great on Linux but not…

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## [Regression: fixed effects + quantiles](https://discourse.julialang.org/t/regression-fixed-effects-quantiles/45427)

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**Author:** [@danicaratelli](https://discourse.julialang.org/u/danicaratelli)\
**Replies:** 16\
**Last updated:** [October 12, 2020, 7:23pm UTC](https://discourse.julialang.org/t/regression-fixed-effects-quantiles/45427 "2020-10-12T19:23:00Z")

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I am trying to run a quantile regression with fixed effects. Does anyone know if a package for this exists? Thanks!

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## [Method dispatch on function types with constructor](https://discourse.julialang.org/t/method-dispatch-on-function-types-with-constructor/48247)

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**Author:** [@martenlienen](https://discourse.julialang.org/u/martenlienen)\
**Replies:** 2\
**Last updated:** [October 12, 2020, 6:59pm UTC](https://discourse.julialang.org/t/method-dispatch-on-function-types-with-constructor/48247 "2020-10-12T18:59:57Z")

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I am using Zygote to autodiff some code and Zygote needs me to define an adjoint for some constructor. Following the docs, I went on to define an rrule with ChainRules but now I am stuck because it does not work. The pro…

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## [LsqFit curve fit does not consider bounds on intercepts correctly](https://discourse.julialang.org/t/lsqfit-curve-fit-does-not-consider-bounds-on-intercepts-correctly/48233)

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**Author:** [@lmiq](https://discourse.julialang.org/u/lmiq)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 6:06pm UTC](https://discourse.julialang.org/t/lsqfit-curve-fit-does-not-consider-bounds-on-intercepts-correctly/48233 "2020-10-12T18:06:51Z")

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I am trying to get some fits with LsqFit with bounds, but I am observing strange results which seem to imply that LsqFit is minimizing the correlation coefficient but not the residue of the fit. This is a minimal example…

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## [How to find combination of linear transformations to recover original Matrix with wrap?](https://discourse.julialang.org/t/how-to-find-combination-of-linear-transformations-to-recover-original-matrix-with-wrap/48186)

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**Author:** [@Nosferican](https://discourse.julialang.org/u/Nosferican)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 5:27pm UTC](https://discourse.julialang.org/t/how-to-find-combination-of-linear-transformations-to-recover-original-matrix-with-wrap/48186 "2020-10-12T17:27:39Z")

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Given obj::CircularArray{Bool,2,BitMatrix} that has undergone a combination of linear transformations circshift(A::AbstractMatrix, shifts::NTuple{2,\<:Integer}) rotl90(A::AbstractMatrix, k::Integer) reverse(A::Abstrac…

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## [Unstable type with dispatch by Val{:X}() with 5 functions](https://discourse.julialang.org/t/unstable-type-with-dispatch-by-val-x-with-5-functions/48072)

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**Author:** [@PharmCat](https://discourse.julialang.org/u/PharmCat)\
**Replies:** 9\
**Last updated:** [October 12, 2020, 5:19pm UTC](https://discourse.julialang.org/t/unstable-type-with-dispatch-by-val-x-with-5-functions/48072 "2020-10-12T17:19:10Z")

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When i use following code i have no problems with types using LinearAlgebra, BlockDiagonals function f1(x::Vector{T}, ::Int, ::Val{:A}) where T Diagonal(x) end function f1(x::Vector{T}, i::Int, ::Val{:B}) where T …

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## [Saving plot to html](https://discourse.julialang.org/t/saving-plot-to-html/48029)

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**Author:** [@bnase](https://discourse.julialang.org/u/bnase)\
**Replies:** 8\
**Last updated:** [October 12, 2020, 5:14pm UTC](https://discourse.julialang.org/t/saving-plot-to-html/48029 "2020-10-12T17:14:40Z")

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Hello, First time poster, long time lurker! We are using docker and we wait to avoid local X windows installation. Display() tries to use xdb-show, which we cannot have. We want to save the contents of the figure in ht…

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## [Output in VSCode](https://discourse.julialang.org/t/output-in-vscode/48139)

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**Author:** [@brett\_knoss](https://discourse.julialang.org/u/brett_knoss)\
**Replies:** 5\
**Last updated:** [October 12, 2020, 5:00pm UTC](https://discourse.julialang.org/t/output-in-vscode/48139 "2020-10-12T17:00:59Z")

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I ran this, and didn’t get any errors: a=f(x,y)=x^2+y g1= derivative(sin,0.0) g2=derivative(a) print(g1) print(g2) I don’t however, have an output for the function, nor can I find a sum, when I put in f(3,2) for f(…

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## [How to debug profiler warning about invalid memory location](https://discourse.julialang.org/t/how-to-debug-profiler-warning-about-invalid-memory-location/40477)

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**Author:** [@alemelis](https://discourse.julialang.org/u/alemelis)\
**Replies:** 5\
**Last updated:** [October 12, 2020, 4:08pm UTC](https://discourse.julialang.org/t/how-to-debug-profiler-warning-about-invalid-memory-location/40477 "2020-10-12T16:08:12Z")

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Hello, I was curious about profiling (and learning how to do it) a code I wrote. Reading the official guide (here), I came across the ProfileView.jl package. I simply used the @profview macro provided by the package and…

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## [Pass rcParams to pyplot() while using Plots.jl](https://discourse.julialang.org/t/pass-rcparams-to-pyplot-while-using-plots-jl/48058)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 1\
**Last updated:** [October 12, 2020, 3:56pm UTC](https://discourse.julialang.org/t/pass-rcparams-to-pyplot-while-using-plots-jl/48058 "2020-10-12T15:56:17Z")

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If one uses PyPlot.jl separately from Plots.jl, one can change all default settings by editing rcParams dictionary. Is there a way to edit rcParams if one uses PyPlot as a backend for Plots.jl? May be I can pass rcParam…

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## [Dynamically split DataFrame into bins](https://discourse.julialang.org/t/dynamically-split-dataframe-into-bins/48046)

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**Author:** [@fbanning](https://discourse.julialang.org/u/fbanning)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 3:27pm UTC](https://discourse.julialang.org/t/dynamically-split-dataframe-into-bins/48046 "2020-10-12T15:27:45Z")

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I suppose this is a simple thing to do but I don’t quite know what to search for. I’m currently wondering how I can dynamically split a DataFrame into equal size bins. using DataFrames, StatsPlots df = DataFrame(a = ra…

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## [Is there a way to reshape a Vector to a row-major AbstractMatrix?](https://discourse.julialang.org/t/is-there-a-way-to-reshape-a-vector-to-a-row-major-abstractmatrix/48214)

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**Author:** [@astrojhgu](https://discourse.julialang.org/u/astrojhgu)\
**Replies:** 4\
**Last updated:** [October 12, 2020, 3:13pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-reshape-a-vector-to-a-row-major-abstractmatrix/48214 "2020-10-12T15:13:52Z")

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I have a 1-D vector of size of (nm, 1), i.e., length=nm. I need to reshape it to a n rows m cols matrix, like 1 5 9 2 6 10 3 7 11 4 8 12 , but in memory it is row-majored. So that I can access its rows efficien…

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## [How can I reset my Julia path in Atom?](https://discourse.julialang.org/t/how-can-i-reset-my-julia-path-in-atom/47818)

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**Author:** [@JamesIrvineTrail](https://discourse.julialang.org/u/JamesIrvineTrail)\
**Replies:** 1\
**Last updated:** [October 12, 2020, 3:06pm UTC](https://discourse.julialang.org/t/how-can-i-reset-my-julia-path-in-atom/47818 "2020-10-12T15:06:25Z")

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I upgraded to the latest versions of both Julia and Atom on Windows 10 Pro. I used the Windows uninstaller to uninstall the older versions; after that I deleted the .atom and .julia subfolders in my Users folder to make …

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## [Get intertermediate results from gradient computation](https://discourse.julialang.org/t/get-intertermediate-results-from-gradient-computation/48226)

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**Author:** [@AnnahDo](https://discourse.julialang.org/u/AnnahDo)\
**Replies:** 0\
**Last updated:** [October 12, 2020, 2:08pm UTC](https://discourse.julialang.org/t/get-intertermediate-results-from-gradient-computation/48226 "2020-10-12T14:08:35Z")

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Hi, I am calculating the gradient of a function, but I also want to know some other values that are calculated. So in addition to wanting the loss and the gradient of the loss, I want my function to output more values. …

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## [IJulia install stops for MbedTLS error](https://discourse.julialang.org/t/ijulia-install-stops-for-mbedtls-error/37974)

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**Author:** [@ctkelley](https://discourse.julialang.org/u/ctkelley)\
**Replies:** 17\
**Last updated:** [October 12, 2020, 2:07pm UTC](https://discourse.julialang.org/t/ijulia-install-stops-for-mbedtls-error/37974 "2020-10-12T14:07:35Z")

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I’ve been having problems with IJulia (old notebooks not working) and have fixed this before with a rebuild of my .julia directory. When I do \]add IJulia everything seem to be fine until I get an error with MbedTLS. Is t…

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## [IJulia Installation Problem - MbedTLS Error](https://discourse.julialang.org/t/ijulia-installation-problem-mbedtls-error/48198)

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**Author:** [@Zehra112](https://discourse.julialang.org/u/Zehra112)\
**Replies:** 1\
**Last updated:** [October 12, 2020, 2:01pm UTC](https://discourse.julialang.org/t/ijulia-installation-problem-mbedtls-error/48198 "2020-10-12T14:01:30Z")

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Hi everyone, I am new in Julia, I am trying to install IJulia package. I am using Windows 10 -\>64bit OS, and last version of Julia, 1.5.2 (Sept 23,2020). \]add IJulia is my command. It works until it comes to: download…

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## [Looking for next role](https://discourse.julialang.org/t/looking-for-next-role/34469)

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**Author:** [@johnh](https://discourse.julialang.org/u/johnh)\
**Replies:** 10\
**Last updated:** [June 30, 2020, 8:12am UTC](https://discourse.julialang.org/t/looking-for-next-role/34469 "2020-06-30T08:12:16Z")

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I am looking for a role in High Performance Computing / ML I have a lot of experience as an architect and Dev Ops engineer. Ideally the role would involve Julia!

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## [How to ship the exact environment together with a julia script](https://discourse.julialang.org/t/how-to-ship-the-exact-environment-together-with-a-julia-script/48199)

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**Author:** [@sylvaticus](https://discourse.julialang.org/u/sylvaticus)\
**Replies:** 14\
**Last updated:** [October 12, 2020, 12:47pm UTC](https://discourse.julialang.org/t/how-to-ship-the-exact-environment-together-with-a-julia-script/48199 "2020-10-12T12:47:42Z")

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I did come across with the dependency hell for a Pyton script I wrote 4-5 years ago whose output was finally to get published. I need to run however my script under a slightly changed scenario and when I try to blindly …

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## [Exporting specifically \`..\` from IntervalArithmetic.jl for use in module](https://discourse.julialang.org/t/exporting-specifically-from-intervalarithmetic-jl-for-use-in-module/48217)

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**Author:** [@kapple](https://discourse.julialang.org/u/kapple)\
**Replies:** 2\
**Last updated:** [October 12, 2020, 12:26pm UTC](https://discourse.julialang.org/t/exporting-specifically-from-intervalarithmetic-jl-for-use-in-module/48217 "2020-10-12T12:26:49Z")

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I would like to specifically load the .. operator from IntervalArithmetic.jl The following don’t work: using IntervalArithmetic:.. using IntervalArithmetic:interval using IntervalArithmetic:@interval How can I load t…

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## [Ars Technica: The unreasonable effectiveness of the Julia programming language](https://discourse.julialang.org/t/ars-technica-the-unreasonable-effectiveness-of-the-julia-programming-language/48035)

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**Author:** [@helgee](https://discourse.julialang.org/u/helgee)\
**Replies:** 2\
**Last updated:** [October 12, 2020, 12:14pm UTC](https://discourse.julialang.org/t/ars-technica-the-unreasonable-effectiveness-of-the-julia-programming-language/48035 "2020-10-12T12:14:18Z")

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## [Global sensitivity analysis - Morris Analysis](https://discourse.julialang.org/t/global-sensitivity-analysis-morris-analysis/46825)

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**Author:** [@SoFi](https://discourse.julialang.org/u/SoFi)\
**Replies:** 21\
**Last updated:** [October 12, 2020, 11:54am UTC](https://discourse.julialang.org/t/global-sensitivity-analysis-morris-analysis/46825 "2020-10-12T11:54:58Z")

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I am new to Julia and I am looking for a way to do Morris analysis on an system of ODEs. I would like to get a analysis as time series. Additionally, I would like to get the tested parameters to use these as a virtual pa…

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## [VS code extension uses debugger to run the code not as in Docs](https://discourse.julialang.org/t/vs-code-extension-uses-debugger-to-run-the-code-not-as-in-docs/48215)

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**Author:** [@BenCzaczkes](https://discourse.julialang.org/u/BenCzaczkes)\
**Replies:** 0\
**Last updated:** [October 12, 2020, 11:46am UTC](https://discourse.julialang.org/t/vs-code-extension-uses-debugger-to-run-the-code-not-as-in-docs/48215 "2020-10-12T11:46:24Z")

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I am a new user so might be doing something wrong but I tried to follow “Getting Started · Julia in VS Code” specifically “To run the Hello World program, click Run: Julia File in Terminal play button in the top-right…

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## [How to tackle 2D Poisson equation?](https://discourse.julialang.org/t/how-to-tackle-2d-poisson-equation/48185)

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**Author:** [@sw72](https://discourse.julialang.org/u/sw72)\
**Replies:** 3\
**Last updated:** [October 12, 2020, 11:27am UTC](https://discourse.julialang.org/t/how-to-tackle-2d-poisson-equation/48185 "2020-10-12T11:27:08Z")

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Can anyone point me in the right direction for solving a 2D Poisson equation in a circular region? I’m a little overwhelmed by the number of different Julia packages which a google search returns, and it can be hard to …

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## [Splitting texts in an array](https://discourse.julialang.org/t/splitting-texts-in-an-array/48203)

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**Author:** [@mausam614](https://discourse.julialang.org/u/mausam614)\
**Replies:** 2\
**Last updated:** [October 12, 2020, 10:32am UTC](https://discourse.julialang.org/t/splitting-texts-in-an-array/48203 "2020-10-12T10:32:46Z")

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How to get a separate array for movie names and years from the array? l = \[“The Wizard of Oz (1939)”, “Citizen Kane (1941)”, “The Cabinet of Dr. Caligari (Das Cabinet des Dr. Caligari) (1920)”, “Casablanca (1942)”\] des…

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## [Interpolations inaccuracy](https://discourse.julialang.org/t/interpolations-inaccuracy/48102)

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**Author:** [@OlafTeichert](https://discourse.julialang.org/u/OlafTeichert)\
**Replies:** 6\
**Last updated:** [October 12, 2020, 10:17am UTC](https://discourse.julialang.org/t/interpolations-inaccuracy/48102 "2020-10-12T10:17:11Z")

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While moving code from python, I noticed that linear interpolation in Julia is less accurate than the python numpy interp function, see MWE below. The error may seem tiny, but the value is integrated and adds up over ti…

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