# \#tidier

**URL:** https://discourse.julialang.org/tag/tidier/1556.md

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## [Side effects (or intended effects) in TidierData?](https://discourse.julialang.org/t/side-effects-or-intended-effects-in-tidierdata/133438)

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**Author:** [@rocco\_sprmnt21](https://discourse.julialang.org/u/rocco_sprmnt21)\
**Replies:** 11\
**Last updated:** [October 31, 2025, 10:53pm UTC](https://discourse.julialang.org/t/side-effects-or-intended-effects-in-tidierdata/133438 "2025-10-31T22:53:35Z")

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julia\> df4 = DataFrame(x = \["a", "b", "a", "b", "C", "a"\], y = 1:6, yz = 13:18, a = \[join(rand('a':'z',4)) for \_ in 1:6\], ab = 12:-1:7) 6×5 DataFrame Row │ x y yz a ab │ String Int64 Int6…

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## [TidierData.jl ― Apply transform across columns while retaining access to other variables in the row](https://discourse.julialang.org/t/tidierdata-jl-apply-transform-across-columns-while-retaining-access-to-other-variables-in-the-row/130115)

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**Author:** [@lunafazio](https://discourse.julialang.org/u/lunafazio)\
**Replies:** 7\
**Last updated:** [June 27, 2025, 9:03am UTC](https://discourse.julialang.org/t/tidierdata-jl-apply-transform-across-columns-while-retaining-access-to-other-variables-in-the-row/130115 "2025-06-27T09:03:43Z")

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My code is @chain df begin @mutate(across(startswith("β"), x -\> τ\*x)) end where τ is another column in df, but it complains that it can’t find it in the Main module. Is there a way to indicate that I want the v…

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## [Tidier ! ! interpolation of external variables](https://discourse.julialang.org/t/tidier-interpolation-of-external-variables/124776)

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**Author:** [@hatmatrix](https://discourse.julialang.org/u/hatmatrix)\
**Replies:** 8\
**Last updated:** [January 19, 2025, 11:23pm UTC](https://discourse.julialang.org/t/tidier-interpolation-of-external-variables/124776 "2025-01-19T23:23:16Z")

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Invoking the @filter function in the TidierData package, I’m trying to use the the !! syntax to refer to a variable not in the data frame as described here: If you want to refer to an object a that is defined outside o…

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## [~TidierData.jl~ - Apply Transform to Many Columns](https://discourse.julialang.org/t/tidierdata-jl-apply-transform-to-many-columns/120726)

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**Author:** [@mrufsvold](https://discourse.julialang.org/u/mrufsvold)\
**Replies:** 4\
**Last updated:** [October 12, 2024, 4:12am UTC](https://discourse.julialang.org/t/tidierdata-jl-apply-transform-to-many-columns/120726 "2024-10-12T04:12:29Z")

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I have a dataset with a bunch of columns with string data that have the format “(1.0, 2.0)”. All of these columns end with the postfix “CI”. I’d like to apply a function that splits the numbers into the low and high valu…

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## [Installation Issues for TidierDB with Tidier](https://discourse.julialang.org/t/installation-issues-for-tidierdb-with-tidier/112967)

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**Author:** [@jjAtNxtPt](https://discourse.julialang.org/u/jjAtNxtPt)\
**Replies:** 6\
**Last updated:** [April 22, 2024, 2:53pm UTC](https://discourse.julialang.org/t/installation-issues-for-tidierdb-with-tidier/112967 "2024-04-22T14:53:47Z")

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I’m pretty new to using Julia and was trying to test out the Tidier packages and add in the TidierDB. However, when I try to add the TidierDB package after already having Tidier installed I get a requirements issue. It…

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## [Tidier creating random columns](https://discourse.julialang.org/t/tidier-creating-random-columns/111220)

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**Author:** [@RobertGregg](https://discourse.julialang.org/u/RobertGregg)\
**Replies:** 4\
**Last updated:** [March 8, 2024, 5:32pm UTC](https://discourse.julialang.org/t/tidier-creating-random-columns/111220 "2024-03-08T17:32:06Z")

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I’m trying to randomly split some data stratified by a reference vector. My idea was to group by each category in the reference column and then create a new random column using a Bernoulli random sample. using Tidier, D…