R: tidy text dataset - tibble

Text Vector

text <- c("Because I could not stop for Death -",
          "He kindly stopped for me -",
          "The Carriage held but just Ourselves -",
          "and Immortality")
text

Tidy Text Dataset

install.packages("dplyr")
library(dplyr)
text_df <- data_frame(line = 1:4, text = text)
text_df

Tidy Text Novel

library(janeaustenr)
library(dplyr)
library(stringr)
original_books <- austen_books() %>%
   group_by(book) %>%
   mutate(linenumber = row_number(),
          chapter = cumsum(str_detect(text, regex("^chapter [\\divxlc]",
                                            ignore_case = TRUE)))) %>%
   ungroup()
original_books

Buat menjadi one-token-per-row

library(tidytext)
tidy_books <- original_books %>%
              unnest_tokens(word, text)
tidy_books

Buang stopwords

data(stop_words)
tidy_books <- tidy_books %>%
              anti_join(stop_words)

Word Count

tidy_books %>%
    count(word, sort = TRUE)

Plot

library(ggplot2)
tidy_books %>%
    count(word, sort = TRUE) %>%
filter(n > 600) %>%
mutate(word = reorder(word, n)) %>%
ggplot(aes(word, n)) +
       geom_col() +
       xlab(NULL) +
       coord_flip()

Pranala Menarik

• R