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.

Examples: Apply[f, a, b, c] ; Apply[Plus, g[a, b]] .

Level specifications are described in Section A.3.6.

The default value for levelspec in Apply is {0}.

f @@@ expr is equivalent to Apply[f, expr, 1].

Examples: Apply[f, a,b,c,d] .

Apply[f, a,b,c,d, 1] .

Apply[f, a, -2] .

See The Mathematica Book: Section 1.8.12 and Section 2.2.3.

See also: Map, Scan, Level, Operate, MapThread.

Further Examples