Map
 Usage
• Map[f, expr] or f /@ expr applies f to each element on the first level in expr.
• Map[f, expr, levelspec] applies f to parts of expr specified by levelspec.
Notes
• Level specifications are described in Section A.3.6. • The default value for levelspec in Map is {1}. • Examples: Map[f,   a,b , c,d  ]  ; Map[f,   a,b , c,d  , 2] ; Map[f,   a,b , c,d  , -1] . • If expr is a SparseArray object, Map[f, expr] applies f to the values or subarrays that appear in expr. • New in Version 1.
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