This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.

# Position

 Positiongives a list of the positions at which objects matching pattern appear in expr. Positionfinds only objects that appear on levels specified by levelspec. Positiongives the positions of the first n objects found.
• Position tests all the subparts of expr in turn to try and find ones that match pattern.
• A part specification returned by Position represents the whole of expr.
• Position[list, pattern, {1}, Heads->False] finds positions only of objects that appear as complete elements of list.
• Position uses standard level specifications:
 n levels through n Infinity levels through Infinity {n} level n only {n1,n2} levels through
• A positive level n consists of all parts of expr specified by n indices.
• A negative level -n consists of all parts of expr with depth n.
• Level corresponds to the whole expression.
• With the default option setting Heads->True, Position includes heads of expressions, and their parts.
• Position traverses expressions in depth-first order, yielding lists of indices in lexicographic order.
Find the positions at which occurs:
Find all positions at which to any power appears:
Find only those down to level 2:
Find the positions at which occurs:
 Out[1]=
 Out[2]=

Find all positions at which to any power appears:
 Out[1]=
Find only those down to level 2:
 Out[2]=
 Scope   (2)
Find the positions of the first 2 's that appear on level 1:
Depth-first traversal gives longer lists of indices first:
Position works with any head, not just List:
 Options   (1)
Use Extract to extract parts based on results from Position:
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