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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, levspec] applies f to all parts of expr on levels specified by levspec.
Example: MapIndexed[f, a, b, c ]  .
Level specifications are described in Section A.3.6.
The default value for levelspec in MapIndexed is {1}.
Example: MapIndexed[f,  a, b , c, d , Infinity]  .
See The Mathematica Book: Section 2.2.4.
See also: MapAt.
Further Examples
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