Returns subsets of a corpus that meet certain conditions, including direct
logical operations on docvars (document-level variables). Works just like
the normal subset command but for corpus objects.
Usage
"subset"(x, subset, select, ...)
Arguments
x
corpus object to be subsetted.
subset
logical expression indicating elements or rows to keep: missing
values are taken as false.
select
expression, indicating the attributes to select from the corpus