Query

利用可能

Successive-level queries over lists and associations

形式

Query[operator1, operator2, …]

検証済みの例Query[2] @ data → data[[2]]Query[Total, "a"] @ data → Total[Lookup[data, a]]Query[Select[#a < 5&], "b"] @ data → Lookup[Select[data, #a < 5 & ], b]オプション

FailureAction — default "Abort"
MissingBehavior — default Automatic
PartBehavior — default Automatic

Qurakで実行リファレンスを検索

トピック

Computation With Structured Datasets - Explicit Parts of Datasets
Computation With Structured Datasets - Custom Query Construction
New In100 Alphabetical Listing - Q

関連

Dataset Part FailureAction MissingBehavior PartBehavior All Association Function Keys List QuantityVariable Span

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