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Is this expected behaviour? x <- factor(c("c", "b", "a","c")) results <- c(c=4, b=5) results[x] giving > results[x] <NA> b c <NA> NA 5 4 NA (i.e. it appears to give results[levels(x)] whereas results[as.character(x)] does what I expected: as.character(x) results[as.character(x)] > as.character(x) [1]