BUILT-IN MATHEMATICA SYMBOL

Apply

Apply[f, expr]
or replaces the head of expr by f.

Apply[f, expr, {1}]
or replaces heads at level of expr by f.

Apply[f, expr, levelspec]
replaces heads in parts of expr specified by levelspec.

Details and Options Details and Options

Apply uses standard level specifications:
n levels through n

Infinity levels through Infinity

{n} level n only

{n₁,n₂} levels through
The default value for levelspec in Apply is .
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 consists of numbers, symbols, and other objects that do not have subparts.
Level 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.