Extract parts of a Container
object similar
to R's base extract operators on lists.
Arguments
- x
Container
object from which to extract elements.
- i, ...
indices specifying elements to extract. Indices
are numeric
or character
vectors or a list
containing both.
Details
[
selects multiple values. The indices can be numeric
or
character
or both. They can be passed as a vector
or list
or,
for convenience, just as a comma-separated sequence (see Examples).
Non-existing indices are ignored.
[[
selects a single value using a numeric
or character
index.