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Sequence within unique values
UniqueSeq(x, sortdata = matrix(1L, length(x), 0))
integer vector
vector
matrix or vector to determine sequence order
Øyvind Langsrud
# 1:4 within A and 1:2 within B UniqueSeq(c("A", "A", "B", "B", "A", "A")) # Ordered differently UniqueSeq(c("A", "A", "B", "B", "A", "A"), c(4, 5, 20, 10, 3, 0))
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