Convert a dictionary from a different format into a quanteda dictionary, or check to see if an object is a dictionary.
as.dictionary(x) is.dictionary(x)
x | object to be coerced or checked; current legal values are a
data.frame with the fields |
---|
as.dictionary
returns a dictionary object. This conversion
function differs from the dictionary
constructor function in that it
converts an existing object rather than creates one from components or from a
file.
is.dictionary
returns TRUE
if an object is a
quanteda dictionary.
not_run({ data(sentiments, package = "tidytext") as.dictionary(subset(sentiments, lexicon == "nrc")) as.dictionary(subset(sentiments, lexicon == "bing")) # to convert AFINN into polarities - adjust thresholds if desired afinn <- subset(sentiments, lexicon == "AFINN") afinn[["sentiment"]] <- with(afinn, sentiment <- ifelse(score < 0, "negative", ifelse(score > 0, "positive", "netural")) ) with(afinn, table(score, sentiment)) as.dictionary(afinn) }) is.dictionary(dictionary(list(key1 = c("val1", "val2"), key2 = "val3")))#> [1] TRUE## [1] TRUE is.dictionary(list(key1 = c("val1", "val2"), key2 = "val3"))#> [1] FALSE## [1] FALSE