[R] Select only cases with negative values

[Johannes Hüsing]

Am 18.10.2008 um 23:03 schrieb Michael Just:

> Hello,
> I was wondering if there was a way to only select cases my from data
> frame that contained a negative value?
>
>> c<-c(1,2,3,4,5,6,7,8,9,10)
>> d<- c(-1,2,-3,-4,5,6,-7,8,-9,10)
>> f <- cbind(c,d)
>> dat <-data.frame(f)
>> dat.lm <-lm(c~d)
>
> If I wanted to only use the rows that had a negative value in column d
> for my regression, how could I make that selection?
>
>

untested:
dat[dat$d < 0, ]