Here’s the easiest way to sort Library of Congress Classification call numbers in R:
gtools is part of standard R. The docs says about
These functions sort or order character strings containing embedded numbers so that the numbers are numerically sorted rather than sorted by character value. I.e. “Asprin 50mg” will come before “Asprin 100mg”. In addition, case of character strings is ignored so that “a”, will come before “B” and “C”.
(I don’t know why “Aspirin” is misspelled.)
If you have a data frame (
df) with column
call_number then you would use
mixedorder to sort the whole thing by call number thusly:
I asked about this on Stack Overflow and on the Code4Lib mailing list last July, then I went on vacation and sort of forgot about it. Nine months later, I thanked Li Kai, who pointed me to a Stack Overflow that solved my problem and let me then answer my own question.