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Extract

Extract[expr, list]
extracts the part of expr at the position specified by list.
Extract[expr, {list1, list2, ...}]
extracts a list of parts of expr.
Extract[expr, list, 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, ...].
  • You can use Extract[expr, ..., Hold] to extract parts without evaluation.
  • If expr is a SparseArray object, Extract[expr, ...] extracts parts in the corresponding ordinary array.
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