Mixedorder data frame in R
问题 I have a data frame which looks like this : a = c("1A","10A","11A","2B","2C","22C","3A","3B") b= c(1,2,3,4,5,6,7,8) ab = data.frame(a,b) and I want to sort it according to the column a . I tried the mixed order library(gtools) ab[mixedorder(ab$a),] but I don' t get the result I want (1A,2B,2C,3A,3B..). How can I fix this? 回答1: We need to convert to character class (as the 'a' column is factor based on the default option in data.frame call i.e. stringsAsFactors=TRUE ) ab[mixedorder(as