##example of the default behaviour:
nseq <- sample(x = 0:3, size = 100, replace = TRUE)
n2s(nseq)
# Show what happens with out-of-range and NA values:
nseq[1] <- NA
nseq[2] <- 777
n2s(nseq)[1:10]
# How to get an RNA instead:
n2s(nseq, levels = c("a", "c", "g", "u"))
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