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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.
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