Hiya
> I'd like to get only "A" as output...
two solutions:
1.-use unique()
unique(tempdata$TYPE)
to get your answer
2.-or call factor again to reduce the levels:
> tmpd <- subset(myd,clas=="A")
> levels(tmpd$clas)
[1] "A" "B" "C"
> tmpd$clas <- factor(tmpd$clas)
> levels(tmpd$clas)
[1] "A"
regards,
IOsu
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