quanteda/quanteda: CRAN v2.1.0

Changes Added block_size to quanteda_options() to control the number of documents in blocked tokenization. Fixed print.dictionary2() to control the printing of nested levels with max_nkey (#1967) Added textstat_summary() to provide detailed information about dfm, tokens and corpus objects. It will replace summary() in future versions. Fixed a performance issue causing slowdowns in tokenizing (using the default what = "word") corpora with large numbers of documents that contain social media tags and URLs that needed to be preserved (such a large corpus of Tweets). Updated the (default) "word" tokenizer to preserve hashtags and usernames better with non-ASCII text, and made these patterns user-configurable in quanteda_options(). The following are now preserved: "#政治" as well as Weibo-style hashtags such as "#英国首相#". convert(x, to = "data.frame") now outputs the first column as "doc_id" rather than "document" since "document" is a commonly occurring term in many texts. (#1918) Added new methods char_select(), char_keep(), and char_remove() for easy manipulation of character vectors. Added dictionary_edit() for easy, interactive editing of dictionaries, plus the functions char_edit() and list_edit() for editing character and list of character objects. Added a method to textplot_wordcloud() that plots objects from textstat_keyness(), to visualize keywords either by comparison or for the target category only. Improved the performance of kwic() (#1840). Added new logsmooth scheme to dfm_weight(). Added new textstat_summary() method, which returns summary information about the tokens/types/features etc in an object. It also caches summary information so that this can be retrieved on subsequent calls, rather than re-computed. Bug fixes and stability enhancements Stopped returning NA for non-existent features when n > nfeat(x) in textstat_frequency(x, n). (#1929) Fixed a problem in dfm_lookup() and tokens_lookup() in which an error was caused when no dictionary key returned a single match (#1946). Fixed a bug that caused a textstat_simil/dist object converted to a data.frame to drop its document2 labels (#1939). Fixed a bug causing dfm_match() to fail on a dfm that included "pads" (""). (#1960) Updated the data_dfm_lbgexample object using more modern dfm internals. Updates textstat_readability(), textstat_lexdiv(), and nscrabble() so that empty texts are not dropped in the result. (#1976