[R] Derive pattern from vector

[syrvn]

Hello,

consider the following vector 'chars':


chars <- c(A, B, C, C, D, E, E, E, F, F, F)


I need to convert 'chars' into the following pattern:


1, 2, 3, 3, 4, 5, 5, 5, 6, 7, 8

As soon as there are duplicates they get the same number otherwise it's
increasing numbers.

However, for the char 'F' it should be always increasing numbers. Is that
possible in R?


I used the following code:


chars <- c('A', 'B', 'C', 'C', 'D', 'E', 'E', 'E', 'F', 'F', 'F')
		
chars_dup <- duplicated(chars)
		
cumsum(!chars_dup)

 [1] 1 2 3 3 4 5 5 5 6 6 6


But I do not know how to treat 'F' in the way described above.


Regards



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