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## sort( c(2.7, 0.1, 9) )
## [1] 0.1 2.7 9 (as vector)
sort(x, decreasing = FALSE, )
## order( c(2.7, 0.1, 9) )
## [1] 2 1 3 (as vector)
order( , na.last = TRUE, decreasing = FALSE, method = c("auto", "shell", "radix"))