v <- c (5, 3, 6, 1, NA, 2, 7, 4 ) sort(v) # [1] 1 2 3 4 5 6 7 sort(v, decreasing=TRUE) # [1] 7 6 5 4 3 2 1 sort(v, na.last=TRUE) # [1] 1 2 3 4 5 6 7 NA sort(v, na.last=FALSE) # [1] NA 1 2 3 4 5 6 7 sort(v, na.last=NA) # [1] 1 2 3 4 5 6 7 is.unsorted(v) # [1] NA w<-sort(v) is.unsorted(w) # [1] FALSE