[R] match problem by rownames

Hi all, While dat['a1',] and dat['a10',] produce the same results in the following example, I'd like dat['a1',] to return NAs. dat - data.frame(x1 = paste(letters[1:5],10, sep=''), x2=rnorm(5)) rownames(dat) - dat$x1 dat['a1',] dat['a10',] sessionInfo() R version 2.7.2 (2008-08-25)

Re: [R] match problem by rownames

As suggested in ?[.data.frame, try: dat[match('a1', rownames(dat)),] Haris Skiadas Department of Mathematics and Computer Science Hanover College On Sep 9, 2008, at 2:41 AM, Xianming Wei wrote: Hi all, While dat['a1',] and dat['a10',] produce the same results in the following example, I'd

Re: [R] match problem by rownames

try this: dat - data.frame(x1 = paste(letters[1:5],10, sep=''), x2=rnorm(5)) row.names(dat) - dat$x1 dat['a1' %in% row.names(dat), ] dat['a10' %in% row.names(dat), ] I hope it helps. Best, Dimitris Hi all, While dat['a1',] and dat['a10',] produce the same results in the following