Re: [R] Problem with na.omit when using length()

Thanks for that. It works as expected now. A case of GIGO (garbage in- garbage out) on my part, with some head-banging. :-) Regards Viju Moses Yihui Xie wrote: just put na.omit() inside length() if you intend to omit the NA elements of the vector (otherwise you are trying to omit the NA's of t

Re: [R] Problem with na.omit when using length()

just put na.omit() inside length() if you intend to omit the NA elements of the vector (otherwise you are trying to omit the NA's of the returned value of length() which is a scalar 2): length(na.omit(sno[a==1 & b==0])) Regards, Yihui -- Yihui Xie Phone: 515-294-6609 Web: http://yihui.name Depar

Re: [R] Problem with na.omit when using length()

This looks buggish to me (though at least non-intuitive), but I am almost sure there is an explanation for why the b==0 condition includes the NAs. You find a way to circumvent it in the last two lines of the example below. a=c(1,1,1,0,0,0) b=c(1,NA,0,1,NA,0) sno=rnorm(6) na.omit(length(sno[a==1