[R] match problem by rownames

[Xianming Wei]

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)
i386-pc-mingw32

locale:
LC_COLLATE=English_Australia.1252;LC_CTYPE=English_Australia.1252;LC_MON
ETARY=English_Australia.1252;LC_NUMERIC=C;LC_TIME=English_Australia.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base


other attached packages:
[1] lattice_0.17-13

loaded via a namespace (and not attached):
[1] grid_2.7.2
>

Regards,
Xianming



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