Richard, Thanks! I never would've thought of using sum() to count the TRUEs in a logical vector, but it makes perfect sense.
Cheers, e. Richard M. Heiberger wrote: > sum() looks faster to me > > tmp <- as.logical(rbinom(100,1,.5)) > > >> system.time(for (i in 1:10000) length(tmp[tmp])) >> > [1] 0.09 0.00 0.09 NA NA > >> system.time(for (i in 1:10000) sum(tmp)) >> > [1] 0.03 0.00 0.03 NA NA > > I am running on Windows XP > > >> Sys.getenv()[20] >> > PROCESSOR_IDENTIFIER > "x86 Family 15 Model 2 Stepping 4, GenuineIntel" > > > ______________________________________________ > 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 > -- Eric Archer, Ph.D. NOAA-SWFSC 8604 La Jolla Shores Dr. La Jolla, CA 92037 858-546-7121,7003(FAX) [EMAIL PROTECTED] "Lighthouses are more helpful than churches." - Benjamin Franklin "Cogita tute" - Think for yourself ______________________________________________ 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