Hi All,
I have a data frame dat1:
dat1 <-data.frame(N=seq(1, 12,1), B=c("29_log","29_log", "29_log", "27_cat",
"27_cat",
"1_log",
"1_log", "1_log", "1_log", "1_log",
"3_cat", "3_cat"))
Then I need to add one column or variable to reflect uniqueness of B variable
in sequential order as below.
dat1$C <-c(1,1,1,2,2,3,3,3,3,3,4,4)
I only show 12 rows, my real data frame has over 1000 rows, I can not manually
to add column C.
It should be easy, but I can not figure out. Can you help me?
Thanks,
Ding
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