Apologies for what might be a daft question, but I’ve lost touch with the developments in the Julia data wrangling ecosystem over the last year or so and found myself a little puzzled when trying to use DataFrames today. Going though some online resources it seemed to me that CSV.jl is the preferre…

What version of DataFrames are you using? You may need to update it. Prior to v0.11 you can use readtable to get an older-style DataFrame that uses DataArrays as columns.

You may find this useful: [image] DataFrames 0.11 released Data After a long and complex development period, we are glad to announce that version 0.11.0 of DataFrames has been released. Among other features listed in the release notes , the major change introduced by this v…

I’m on v0.10.1 (I did Pkg.update(), but it seems that some other packages I have installed require 0.10.1 as per the release announcement linked by Tamas?). I’ve worked out with the help of other forum posts that I can do weakrefstrings=false and nullable=false to get “normal” data in my DataFrame …

Nullable is the earlier attempt that has been phased out. Search the forums for history. I would suggest that you start using v0.11.2 of DataFrames, which is much nicer. See the topic I linked for removing packages that hold it at v0.10.1.

…or use readtable until you’re able to move to DataFrames 0.11 (but be careful about reading the docs about the version you are using).

You can also use https://github.com/davidanthoff/CSVFiles.jl . It will return the “right” missing values in a DataFrame no matter on which version of DataFrames.jl you are. So if you are on DataFrames v0.10 it will use the old style DataArray for missing values, on DataFrames v0.11 it will create a D…

Nullables - why? and how?

New to Julia

Tamas_Papp December 19, 2017, 4:34pm 3

You may find this useful:

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How to deal with a Nullable DataFrame? General Usage	3	424	June 7, 2019
How to change value of Nullable{WeakRefString{UInt8}} using CSV package? Data data	4	1370	September 26, 2017
Announcement: An Update on DataFrames Future Plans Data announcement	41	9477	December 27, 2017
Data Frames for non null data Data	4	1382	February 23, 2018
Issue with DataFrames, operations on DataFrames now return Nullable Arrays? General Usage	5	1952	July 19, 2017

Nullables - why? and how?

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