This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.

# MapIndexed

 MapIndexed[f, expr]applies f to the elements of expr, giving the part specification of each element as a second argument to f. MapIndexed[f, expr, levelspec]applies f to all parts of expr on levels specified by levelspec.
 n levels 1 through n Infinity levels 1 through Infinity {n} level n only {n1,n2} levels n1 through n2
• The default value for levelspec in MapIndexed is {1}.
• 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 -1 consists of numbers, symbols and other objects that do not have subparts.
• Level 0 corresponds to the whole expression.
• With the option setting , MapIndexed also applies to heads of expressions, and their parts.
• MapIndexed traverses the parts of expr in a depth-first order, with leaves visited before roots. »
• MapIndexed always effectively constructs a complete new expression, and then evaluates it.
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