Extract

利用可能

Extracts parts at specified positions.

形式

Extract[expr, pos]

Extract[expr, {pos1, pos2, …}]

Extract[expr, pos, h]

Extract[pos]

検証済みの例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

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トピック

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

関連

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

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