Count

可用

Counts the number of occurrences of a pattern in a list.

形式

Count[list, pattern]

Count[expr, pattern, levelspec]

Count[pattern]

验证过的示例Count[{a, b, a, c, a}, a] → 3 Count[{1, 2, 3, 2, 1}, 2] → 2 Count[{1, 2, 3}, 4] → 0 Count[{x, x, x, y}, x] → 3

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用于

主题

Computation With Structured Datasets - Selections and Transformations
Discrete And Integer Data - Distance Measures»
Elements Of Lists - Finding Sublists
Handling Arrays Of Data - Structural Array Analysis »
List Manipulation - Math & Counting Operations »
Mathematical And Counting Operations On Lists - Multidimensional Arrays

相关

SequenceCount StringCount Cases Position FreeQ MemberQ Select CountDistinct Counts BinCounts Tally Total

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