Sorry. I just got it.... > f[f==4] [1] 4
2013/5/8 jpm miao <miao...@gmail.com> > Thanks, but why does f[f=4] yield 16 instead of 4? > > > f > [1] -2 4 -8 16 -32 64 -128 > > f[f<0] > [1] -2 -8 -32 -128 > > f[f>0] > [1] 4 16 64 > > f[f=4] > [1] 16 > > > 2013/5/8 Jorge I Velez <jorgeivanve...@gmail.com> > >> f [ f < 0 ] >> >> >> On Wed, May 8, 2013 at 11:54 AM, jpm miao <miao...@gmail.com> wrote: >> >>> Hi, >>> >>> I have a vector f with some negative columns. I remember that there is >>> an easy expression that can find out negative items. Can someone tell me >>> how I can do it? >>> >>> It seems to be >>> f[i such that f[i]<0 ...] >>> >>> Thanks, >>> >>> Miao >>> >>> > d<-1:7 >>> > f<-(-2)^d >>> > f >>> [1] -2 4 -8 16 -32 64 -128 >>> >>> [[alternative HTML version deleted]] >>> >>> ______________________________________________ >>> R-help@r-project.org 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]] ______________________________________________ R-help@r-project.org 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.
