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Interface to apply filter and index functions to corpora.
# S3 method for PCorpus
tm_filter(x, FUN, …)
# S3 method for SimpleCorpus
tm_filter(x, FUN, …)
# S3 method for VCorpus
tm_filter(x, FUN, …)
# S3 method for PCorpus
tm_index(x, FUN, …)
# S3 method for SimpleCorpus
tm_index(x, FUN, …)
# S3 method for VCorpus
tm_index(x, FUN, …)
A corpus.
a filter function taking a text document or a string (if
x
is a SimpleCorpus
) as input and returning a
logical value.
arguments to FUN
.
tm_filter
returns a corpus containing documents where
FUN
matches, whereas tm_index
only returns the
corresponding indices.
# NOT RUN {
data("crude")
# Full-text search
tm_filter(crude, FUN = function(x) any(grep("co[m]?pany", content(x))))
# }
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