get_dewey_decimal_subject_class {libbib}

Conversion from Dewey Decimal call numbers to first-level subject description

Description

Takes a string representation of a Dewey Decimal call number (DDC) and returns it's subject description. This uses the hundreds place of the DDC number and returns the most general subject classification.

Usage

get_dewey_decimal_subject_class(x)

Arguments

x

A Dewey Decimal call number

Value

Returns the most general subject classification using the hundreds places from the DDC. Returns NA if the DDC looks invalid

Examples

get_dewey_decimal_subject_class("709.05")     # Arts

get_dewey_decimal_subject_class("823.912")
# Literature (Belles-lettres) and rhetoric

# vectorized
get_dewey_decimal_subject_class(c("709.05", "invalid", NA, "823.912"))
# c("Arts", NA, NA, "Literature (Belles-lettres) and rhetoric")