Extract methods for docvars

# S3 method for corpus
$(x, name)

# S3 method for corpus
$(x, name) <- value

# S3 method for tokens
$(x, name)

# S3 method for tokens
$(x, name) <- value

# S3 method for dfm
$(x, name)

# S3 method for dfm
$(x, name) <- value

Arguments

x

corpus, tokens, or dfm object whose document-level variables will be read or set

name

a literal character string specifying a single docvars name

value

a vector of document variable values to be assigned to name

Examples

# accessing or assigning docvars for a corpus using "$" data_corpus_inaugural$Year
#> [1] 1789 1793 1797 1801 1805 1809 1813 1817 1821 1825 1829 1833 1837 1841 1845 #> [16] 1849 1853 1857 1861 1865 1869 1873 1877 1881 1885 1889 1893 1897 1901 1905 #> [31] 1909 1913 1917 1921 1925 1929 1933 1937 1941 1945 1949 1953 1957 1961 1965 #> [46] 1969 1973 1977 1981 1985 1989 1993 1997 2001 2005 2009 2013 2017
data_corpus_inaugural$century <- floor(data_corpus_inaugural$Year / 100) data_corpus_inaugural$century
#> [1] 17 17 17 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 #> [26] 18 18 18 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 #> [51] 19 19 19 20 20 20 20 20
# accessing or assigning docvars for tokens using "$" toks <- tokens(corpus_subset(data_corpus_inaugural, Year <= 1805)) toks$Year
#> [1] 1789 1793 1797 1801 1805
toks$Year <- 1991:1995 toks$Year
#> [1] 1991 1992 1993 1994 1995
toks$nonexistent <- TRUE docvars(toks)
#> Year President FirstName Party century nonexistent #> 1 1991 Washington George none 17 TRUE #> 2 1992 Washington George none 17 TRUE #> 3 1993 Adams John Federalist 17 TRUE #> 4 1994 Jefferson Thomas Democratic-Republican 18 TRUE #> 5 1995 Jefferson Thomas Democratic-Republican 18 TRUE
# accessing or assigning docvars for a dfm using "$" dfmat <- dfm(toks) dfmat$Year
#> [1] 1991 1992 1993 1994 1995
dfmat$Year <- 1991:1995 dfmat$Year
#> [1] 1991 1992 1993 1994 1995
dfmat$nonexistent <- TRUE docvars(dfmat)
#> Year President FirstName Party century nonexistent #> 1 1991 Washington George none 17 TRUE #> 2 1992 Washington George none 17 TRUE #> 3 1993 Adams John Federalist 17 TRUE #> 4 1994 Jefferson Thomas Democratic-Republican 18 TRUE #> 5 1995 Jefferson Thomas Democratic-Republican 18 TRUE