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Extract

  • Extract[ expr , list ] extracts the part of expr at the position specified by list.
  • Extract[ expr , , , ... ] extracts a list of parts of expr.
  • Extract[ expr , ... , h ] extracts parts of expr, wrapping each of them with head h before evaluation.
  • Extract[ expr , i , j , ... ] is equivalent to Part[ expr , i , j , ... ].
  • The position specifications used by Extract have the same form as those returned by Position, and used in functions such as MapAt and ReplacePart.
  • You can use Extract[ expr , ... , Hold] to extract parts without evaluation.
  • See the Mathematica book: Section 1.8.4.
  • See also: Part.