CountsBy

可用

Like `Counts`, but groups by the value of a classifier function.

形式

CountsBy[{e1, e2, …}, f]

CountsBy[f]

验证过的示例CountsBy[{1, 2, 3, 4, 5, 6}, OddQ] → <|True -> 3, False -> 3|>

在 Qurak 上运行搜索参考

主题

Associations - Functions That Create Associations
Computation With Structured Datasets - Selections and Transformations
Computation With Structured Datasets - Creating Associations
Database Like Operations On Datasets - General
Functional Programming - Association-Oriented Functions »
New In100 Alphabetical Listing - C

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