Get the feature labels from a dfm

Get the features from a document-feature matrix, which are stored as the column names of the dfm object.

featnames(x)

Arguments

x	the dfm whose features will be extracted

Value

character vector of the feature labels

Examples

inaugDfm <- dfm(data_corpus_inaugural, verbose = FALSE)

# first 50 features (in original text order)
head(featnames(inaugDfm), 50)
#>  [1] "fellow-citizens" "of"              "the"             "senate"         
#>  [5] "and"             "house"           "representatives" ":"              
#>  [9] "among"           "vicissitudes"    "incident"        "to"             
#> [13] "life"            "no"              "event"           "could"          
#> [17] "have"            "filled"          "me"              "with"           
#> [21] "greater"         "anxieties"       "than"            "that"           
#> [25] "which"           "notification"    "was"             "transmitted"    
#> [29] "by"              "your"            "order"           ","              
#> [33] "received"        "on"              "14th"            "day"            
#> [37] "present"         "month"           "."               "one"            
#> [41] "hand"            "i"               "summoned"        "my"             
#> [45] "country"         "whose"           "voice"           "can"            
#> [49] "never"           "hear"           

# first 50 features alphabetically
head(sort(featnames(inaugDfm)), 50)
#>  [1] "-"           ","           ";"           ":"           "!"          
#>  [6] "?"           "."           "'"           "\""          "("          
#> [11] ")"           "["           "]"           "\\"          ">"          
#> [16] "$"           "1"           "1,000"       "100"         "100,000,000"
#> [21] "120,000,000" "125"         "13"          "14th"        "15th"       
#> [26] "16"          "1774"        "1776"        "1778"        "1780"       
#> [31] "1787"        "1789"        "1790"        "1800"        "1801"       
#> [36] "1812"        "1815"        "1816"        "1817"        "1818"       
#> [41] "1826"        "1850"        "1861"        "1868"        "1873"       
#> [46] "1880"        "1886"        "1890"        "1893"        "1896"       

# contrast with descending total frequency order from topfeatures()
names(topfeatures(inaugDfm, 50))
#>  [1] "the"        "of"         ","          "and"        "."         
#>  [6] "to"         "in"         "a"          "our"        "that"      
#> [11] "we"         "be"         "is"         "it"         "for"       
#> [16] "by"         "have"       "which"      "with"       "not"       
#> [21] "as"         "will"       "i"          "this"       "all"       
#> [26] "are"        "-"          "their"      "but"        "has"       
#> [31] "people"     "from"       "its"        ";"          "government"
#> [36] "or"         "on"         "my"         "been"       "us"        
#> [41] "can"        "no"         "they"       "an"         "so"        
#> [46] "upon"       "who"        "must"       "at"         "great"