摘要： Given one vector and one dataframe.v1 <- c(3,5,23,9,45)d1 <- data.frame(c1 = c(2,8,14,21,30,60,70), c2 = c('001','003','X05','J08','QQ3','TTY','GRE'), stringsAsFactors=FALSE)> v1[1] 3 5 23 9 45> d1 c1 c21 2 0012 8 0033 14 X054 21 J0 阅读全文