simplify this instruction

in addition to %in% and depending on what the general principle behind the 
setup is: 

you may want to have a look into switch (e.g. if there happen to be "C"s 
and "D"s...).

or, of course you can check for B being between 0 and 9 rather than being the 
respective integers: 
ifelse ((B > 0) && (B <= 9)), "A", "B")

HTH
Claudia

Is there a way to simplify this instruction:
ifelse(B=="0","A",
ifelse(B=="1","A",
ifelse(B=="2","A",
ifelse(B=="3","A",
ifelse(B=="4","A",
ifelse(B=="5","A",
ifelse(B=="6","A",
ifelse(B=="7","A",
ifelse(B=="8","A",
ifelse(B=="9","A","B"))))))))))

i am looking for something like this:

ifelse(B=="(0:9)","A","B")

Best regards

Claudia Beleites
Dipartimento dei Materiali e delle Risorse Naturali
Universit? degli Studi di Trieste
Via Alfonso Valerio 6/a
I-34127 Trieste

phone: +39 (0 40) 5 58-34 47
email: cbeleites at units.it