# \#notation

**URL:** https://discourse.julialang.org/tag/notation/1395.md

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## [Performance vs notation tradeoff: DataFrame vs AxisArray vs StaticArray vs?](https://discourse.julialang.org/t/performance-vs-notation-tradeoff-dataframe-vs-axisarray-vs-staticarray-vs/118323)

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**Author:** [@Tetrakai](https://discourse.julialang.org/u/Tetrakai)\
**Replies:** 2\
**Last updated:** [August 20, 2024, 4:47pm UTC](https://discourse.julialang.org/t/performance-vs-notation-tradeoff-dataframe-vs-axisarray-vs-staticarray-vs/118323 "2024-08-20T16:47:33Z")

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I’ve got two datasets that would look like this in a dataframe (see later for MWE): julia\> df1 = mat2df(mat1, colnames1, id1) 8×5 DataFrame Row │ id col1 col2 col3 col4 │ String Int64 Int64 Int64 …

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## [Difference between U+007C “VERTICAL BAR” \`|\` and U+2223 “DIVIDES” \`∣\`](https://discourse.julialang.org/t/difference-between-u-007c-vertical-bar-and-u-2223-divides/117499)

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**Author:** [@paalon](https://discourse.julialang.org/u/paalon)\
**Replies:** 2\
**Last updated:** [July 26, 2024, 2:22pm UTC](https://discourse.julialang.org/t/difference-between-u-007c-vertical-bar-and-u-2223-divides/117499 "2024-07-26T14:22:09Z")

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What is the difference between the two Unicode code points U+007C “VERTICAL BAR” | and U+2223 “DIVIDES” ∣? Julia REPL’s LaTeX-like Unicode input of \\mid gives U+2223, and HTML’s named character references for &mid;, &sho…

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## [Breaking notation convention - a potential anti-pattern?](https://discourse.julialang.org/t/breaking-notation-convention-a-potential-anti-pattern/101699)

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**Author:** [@algunion](https://discourse.julialang.org/u/algunion)\
**Replies:** 16\
**Last updated:** [July 18, 2023, 9:21am UTC](https://discourse.julialang.org/t/breaking-notation-convention-a-potential-anti-pattern/101699 "2023-07-18T09:21:35Z")

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I have a scenario where I think it might be warranted to depart from the end with an exclamation mark convention for function names that modify at least one of their arguments. However, I wouldn’t want to get into an an…