[R] excluding factor levels with read.table() and colClasses=

Dieter Menne dieter.menne at menne-biomed.de
Thu Mar 16 09:08:56 CET 2006

Peter Tait <petertait <at> sympatico.ca> writes:

> Is it possible to remove the "NA" level from a factor with in 
> read.table()?  If not  what is the most efficient  way of doing this?
> inrange<-read.table("C://...",header=T,sep="|",colClasses=c( id="factor"))

See parameters na.strings in read.table. 


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