Displaying 1 result from an estimated 1 matches for "fb9e42d9".
2008 Aug 28
3
drop unused levels in sqldf
Hi,
sqldf is a fantastic package, but when the SELECT procedure runs unused
levels remain in the output. I tried with the drop function, but without
success. Do you have any suggestions?
Thanx, Gianandrea
data(iris)
require(sqldf)
base<-sqldf("select * from iris where Species <> 'setosa'")
str(base) # Species with 3 levels!
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