Returns subsets of a corpus that meet certain conditions, including direct logical operations on docvars (document-level variables). corpus_subset functions identically to subset.data.frame(), using non-standard evaluation to evaluate conditions based on the docvars in the corpus.

corpus_subset(x, subset, drop_docid = TRUE, ...)

Arguments

x

corpus object to be subsetted

subset

logical expression indicating the documents to keep: missing values are taken as false

drop_docid

if TRUE, docid for documents are removed as the result of subsetting.

...

not used

Value

corpus object, with a subset of documents (and docvars) selected according to arguments

See also

Examples

summary(corpus_subset(data_corpus_inaugural, Year > 1980))
#> Corpus consisting of 11 documents, showing 11 documents:
#> 
#>          Text Types Tokens Sentences Year President FirstName      Party
#>   1981-Reagan   902   2780       129 1981    Reagan    Ronald Republican
#>   1985-Reagan   925   2909       123 1985    Reagan    Ronald Republican
#>     1989-Bush   795   2673       141 1989      Bush    George Republican
#>  1993-Clinton   642   1833        81 1993   Clinton      Bill Democratic
#>  1997-Clinton   773   2436       111 1997   Clinton      Bill Democratic
#>     2001-Bush   621   1806        97 2001      Bush George W. Republican
#>     2005-Bush   772   2312        99 2005      Bush George W. Republican
#>    2009-Obama   938   2689       110 2009     Obama    Barack Democratic
#>    2013-Obama   814   2317        88 2013     Obama    Barack Democratic
#>    2017-Trump   582   1660        88 2017     Trump Donald J. Republican
#>    2021-Biden   811   2766       216 2021     Biden Joseph R. Democratic
#> 
summary(corpus_subset(data_corpus_inaugural, Year > 1930 & President == "Roosevelt"))
#> Corpus consisting of 4 documents, showing 4 documents:
#> 
#>            Text Types Tokens Sentences Year President   FirstName      Party
#>  1933-Roosevelt   743   2057        85 1933 Roosevelt Franklin D. Democratic
#>  1937-Roosevelt   725   1989        96 1937 Roosevelt Franklin D. Democratic
#>  1941-Roosevelt   526   1519        68 1941 Roosevelt Franklin D. Democratic
#>  1945-Roosevelt   275    633        27 1945 Roosevelt Franklin D. Democratic
#>