If you want to suppress the unused level of Species, you can use factor() :
table(base$Species)
table(factor(base$Species))
2008/8/28 glaporta <[EMAIL PROTECTED]>
>
> 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!
>
> --
> View this message in context:
> http://www.nabble.com/drop-unused-levels-in-sqldf-tp19196464p19196464.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [email protected] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
[[alternative HTML version deleted]]
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
