CountDistinctBy

可用

Counts distinct values of a function applied to each element

形式

CountDistinctBy[{e1, e2, …}, f]

CountDistinctBy[f]

验证过的示例CountDistinctBy[{{a, x}, {a, y}, {b, z}}, First] → 2 CountDistinctBy[{1, 2, 3, -2, -3}, Abs] → 3

在 Qurak 上运行搜索参考

主题

Mathematical And Counting Operations On Lists - Multidimensional Arrays
New In100 Alphabetical Listing - C

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