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

# Apply (@@)

 Apply[f, expr]or f@@expr replaces the head of expr by f. Apply[f, expr, levelspec]replaces heads in parts of expr specified by levelspec.
• Apply uses standard level specifications:
 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 Apply is {0}.
• f@@@expr is equivalent to Apply[f, expr, {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.
• Apply always effectively constructs a complete new expression, and then evaluates it.
• Apply operates on SparseArray objects just as it would on the corresponding ordinary lists.
 Scope   (10)
 Options   (1)
 Applications   (3)