It is inefficient to use which() rather than a logical index, since you allocate two numeric index vectors (one the length of the original vector) and use an interpreted function rather than optimized C code. Also, in this usage which() handles NAs incorrectly.
I think the clearest answer is probably with(RSF_EU, AREA[AREA <= x]) On Fri, 23 Feb 2007, Henrique Dallazuanna wrote: > You can also: > > test <- RSF_EU[which(RSF_EU$AREA<=x),] > > On 23/02/07, Thomas Preuth <[EMAIL PROTECTED]> wrote: >> >> Hello, >> >> I want to select in a column of a dataframe all numbers smaller than a >> value x >> but when I type in test<-(RSF_EU$AREA<=x) I receiv as answer: >>> test >> [1] TRUE FALSE FALSE TRUE TRUE TRUE FALSE FALSE TRUE TRUE TRUE >> FALSE TRUE TRUE TRUE TRUE TRUE >> [18] TRUE TRUE TRUE TRUE FALSE FALSE TRUE TRUE TRUE TRUE TRUE >> TRUE TRUE FALSE TRUE TRUE TRUE >> [35] FALSE TRUE TRUE TRUE TRUE FALSE FALSE FALSE TRUE TRUE FALSE >> TRUE TRUE FALSE FALSE TRUE FALSE >> [52] TRUE TRUE TRUE TRUE TRUE FALSE TRUE TRUE FALSE TRUE >> >> How can i get the values smaller than x and not the TRUE/FALSE reply? >> >> Thanks in advance, >> Thomas >> >> ______________________________________________ >> R-help@stat.math.ethz.ch 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. >> > > > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch 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.