my data frame this:
name no x 1 x 3 yyy 1 yyy 6 x 8 x 2 x 1 i want change name of last 3 x not x (x1 example). same values not continuous must modified. there many cases in name variable. there way in r? quite not-sorted in sas.
thank much
rle suggests here "same values not continuous must modified"
r <- rle(as.character(df$name)) #run length encoding # lengths: int [1:3] 2 2 3 # values : chr [1:3] "x" "yyy" "x" r$values <- make.unique(r$values,sep="") inverse.rle(r) #[1] "x" "x" "yyy" "yyy" "x1" "x1" "x1" df$name <- inverse.rle(r) df # name no #1 x 1 #2 x 3 #3 yyy 1 #4 yyy 6 #5 x1 8 #6 x1 2 #7 x1 1 