Map[f, expr] or
applies f to each element on the first level in expr.

Map[f, expr, levelspec]
applies f to parts of expr specified by levelspec.

Details and OptionsDetails and Options

  • Map uses standard level specifications:
  • nlevels through n
    Infinitylevels through Infinity
    {n}level n only
    {n1,n2}levels through
  • The default value for levelspec in Map is .
  • 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 consists of numbers, symbols, and other objects that do not have subparts.
  • Level corresponds to the whole expression.
  • With the option setting Heads->True, Map includes heads of expressions and their parts.
  • Map always effectively constructs a complete new expression and then evaluates it.
  • If expr is a SparseArray object, Map[f, expr] applies f to the values or subarrays that appear in expr.
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