PositionIndex

可用

Returns an association mapping each element to the list of its positions.

形式

PositionIndex[list]

PositionIndex[assoc]

已驗證的範例PositionIndex[{a, b, a, c, b}] → <|a -> {1, 3}, b -> {2, 5}, c -> {4}|>PositionIndex[<|1 -> a, 2 -> b, 3 -> c, 4 -> d, 5 -> c, 6 -> a|>] → <|a -> {1, 6}, b -> {2}, c -> {3, 5}, d -> {4}|>

在 Qurak 上執行搜尋參考文件

主題

Associations - Functions That Create Associations
Computation With Structured Datasets - Creating Associations
List Manipulation - Creating Associations from Lists »
New In100 Alphabetical Listing - P
New In100 Core Language And Structure - Associations »

相關

Position StringPosition Tally DeleteDuplicates Counts GroupBy Association CountsBy AssociationMap AssociationThread JoinAcross Key

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