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numvec<-c(1:9,7:15,11,12)
numvec
##  [1]  1  2  3  4  5  6  7  8  9  7  8  9 10 11 12 13 14 15 11 12
numvec.character<-as.character(numvec)
numvec.character
##  [1] "1"  "2"  "3"  "4"  "5"  "6"  "7"  "8"  "9"  "7"  "8"  "9"  "10" "11"
## [15] "12" "13" "14" "15" "11" "12"
numvec.factor<-factor(numvec)
numvec.factor
##  [1] 1  2  3  4  5  6  7  8  9  7  8  9  10 11 12 13 14 15 11 12
## Levels: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
nlevels(numvec.factor)
## [1] 15