Extract

可用

Extracts parts at specified positions.

形式

Extract[expr, pos]

Extract[expr, {pos1, pos2, …}]

Extract[expr, pos, h]

Extract[pos]

验证过的示例Extract[{a, b, c, d}, 2] → b Extract[{a, {b1, b2, b3}, c, d}, {2, 3}] → b3 Extract[Hold[1 + 2, 3 + 4], {2}] → 7

在 Qurak 上运行搜索参考

主题

Elements Of Lists - Finding Sublists
Evaluation Control - Manipulating Unevaluated Expressions
Function Composition And Operator Forms - Functions with Operator Forms
List Manipulation - Elements of Lists »
Parts Of Expressions - General
Parts Of Matrices - Symbolic Matrices

相关

Part Take PadLeft ReplacePart Pick Position Append Cases Delete Drop DeleteCases First

全部 6300 个函数 · 从 MCP 客户端使用