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研鑽Rubyプログラミング読書会
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Hirokazu SUZUKI
November 17, 2023
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研鑽Rubyプログラミング読書会
研鑽Rubyプログラミング7章の関連資料です。
Hirokazu SUZUKI
November 17, 2023
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Transcript
7.3 7.3.1 - メソッドの数が多い - 単純 - 柔軟性は低い 7.3.2 -
メソッドの数が少ない - 複雑 - 柔軟性は高い a.inner_join(b, key) a.full_join(b, key) a.left_join(b, key) etc. 実装は、#joinを呼んでいる 拙作 RedAmberでは、こんな例がある データフレーム同士を結合するメソッド群で、両方とも使っている(他言語の流儀に合わせるため) a.join(b, key, type: :inner_join) :typeは、:inner, :fullなど結合のタイプを指定する ソース: https://github.com/red-data-tools/red_amber/blob/main/lib/red_amber/data_frame_combinable.rb #joinの実装は、Red ArrowのTable#joinを呼びながら データフレーム独自の仕様に基づいて色々やっている
https://gist.github.com/heronshoes/d301bfd58adfbf51e28584bf2e68c190
RedAmber Features RedAmber (Ruby) Tidyverse (R) pandas (Python) DataFrames.jl (Julia)
一致した行だけを連結 (内部結合) inner_join, join dplyr::inner_join merge innerjoin 全ての行を連結 (外部結合) full_join, outer_join, join dplyr::full_join merge outerjoin 左の一致した値を残して連結 (左外部結合) left_join, join dplyr::left_join merge leftjoin 右の一致した値を残して連結 (右外部結合) right_join, join dplyr::right_join merge rightjoin 左の行のうち、右と一致したものを残す semi_join, join dplyr::semi_join [isin] semijoin 左の行のうち、右と一致しなかったもの を残す anti_join, join dplyr::anti_join [isin] antijoin 左右どちらかにある行を残す(和) union dplyr::union merge 左右両方にある行を残す(積) intersect dplyr::intersect merge 左にはあるが右にない行を残す(差) difference, setdiff dplyr::setdiff merge https://github.com/red-data-tools/red_amber/blob/main/doc/DataFrame_Comparison_ja.md