On Apr 28, 2011, at 3:21 PM, Jannis wrote:
> On 04/28/2011 09:53 PM, Benjamin Caldwell wrote:
>> rws50<- subset(rw.fire.RW,shigo.av<50)
>
> quick and dirty would be to replace all NAs with -99999 (or similar), use
> subset, and set all values ==-99999 in the subset back to NA. There may be
> more elegant solutions, though.
>
Indeed. See ?is.na
DF <- data.frame(A = 1:20, B = c(1:15, rep(NA, 5)))
> subset(DF, B > 10)
A B
11 11 11
12 12 12
13 13 13
14 14 14
15 15 15
> subset(DF, (B > 10) | is.na(B))
A B
11 11 11
12 12 12
13 13 13
14 14 14
15 15 15
16 16 NA
17 17 NA
18 18 NA
19 19 NA
20 20 NA
HTH,
Marc Schwartz
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