gutenbergr (version 0.2.4)

gutenberg_subjects: Gutenberg metadata about the subject of each work

Description

Gutenberg metadata about the subject of each work, particularly Library of Congress Classifications (lcc) and Library of Congress Subject Headings (lcsh).

Usage

gutenberg_subjects

Format

A tbl_df (see tibble or dplyr) with one row for each pairing of work and subject, with columns:

gutenberg_id

ID describing a work that can be joined with gutenberg_metadata

subject_type

Either "lcc" (Library of Congress Classification) or "lcsh" (Library of Congress Subject Headings)

subject

Subject

Details

Find more information about Library of Congress Categories here: https://www.loc.gov/catdir/cpso/lcco/, and about Library of Congress Subject Headings here: https://id.loc.gov/authorities/subjects.html.

To find the date on which this metadata was last updated, run attr(gutenberg_subjects, "date_updated").

See Also

gutenberg_metadata, gutenberg_authors

Examples

if (FALSE) { # interactive()

library(dplyr)
library(stringr)

gutenberg_subjects %>%
  filter(subject_type == "lcsh") %>%
  count(subject, sort = TRUE)

sherlock_holmes_subjects <- gutenberg_subjects %>%
  filter(str_detect(subject, "Holmes, Sherlock"))

sherlock_holmes_subjects

sherlock_holmes_metadata <- gutenberg_works() %>%
  filter(author == "Doyle, Arthur Conan") %>%
  semi_join(sherlock_holmes_subjects, by = "gutenberg_id")

sherlock_holmes_metadata

# \donttest{
holmes_books <- gutenberg_download(sherlock_holmes_metadata$gutenberg_id)

holmes_books
# }

# date last updated
attr(gutenberg_subjects, "date_updated")
}