DelayedOp-class {DelayedArray} | R Documentation |
In a DelayedArray object, the delayed operations are stored as a tree of DelayedOp objects. Each node in this tree is a DelayedOp object that represents a delayed operation.
DelayedOp objects are used inside DelayedArray objects and are not intended to be manipulated directly by the end user.
showtree
and simplify
can be used to visualize,
inspect, and simplify this tree.
is_noop(x)
x |
A DelayedSubset, DelayedAperm, or DelayedDimnames object. |
8 types of nodes are currently supported. Each type is a DelayedOp subclass:
Node type Represented operation ------------------------------------------------------------------ DelayedOp (VIRTUAL) ------------------------------------------------------------------ * DelayedUnaryOp (VIRTUAL) o DelayedSubset Multi-dimensional single bracket subsetting. o DelayedAperm Extended aperm() (can drop and/or add ineffective dimensions). o DelayedUnaryIsoOp (VIRTUAL) Unary op that preserves the geometry. - DelayedUnaryIsoOpStack Simple ops stacked together. - DelayedUnaryIsoOpWithArgs One op with vector-like arguments along the dimensions of the input. - DelayedSubassign Multi-dimensional single bracket subassignment. - DelayedDimnames Set/replace the dimnames. ------------------------------------------------------------------ * DelayedNaryOp (VIRTUAL) o DelayedNaryIsoOp N-ary op that preserves the geometry. o DelayedAbind abind() ------------------------------------------------------------------
All the nodes are array-like objects that must comply with the seed
contract i.e. they must support dim()
, dimnames()
, and
extract_array()
. See ?extract_array
for more
information about the seed contract.
is_noop()
can only be called on a DelayedSubset, DelayedAperm,
or DelayedDimnames object at the moment, and will return TRUE
if the object represents a no-op.
The DelayedOp virtual class and its 8 concrete subclasses are for internal use only and never exposed to the end user.
DelayedArray objects.
showtree
to visualize and access the leaves of
a tree of delayed operations carried by a DelayedArray
object.
simplify
to simplify the tree of delayed operations
carried by a DelayedArray object.