Dear colleges,
I do not understand the following behaviour:
aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) )
aa
a1 a2
1 1 NA
2 2 NA
3 3 NA
4 4 NA
5 5 NA
6 6 1
7 7 2
8 8 3
9 9 4
10 10 5
aa[!aa$a2==1, ] # removing rows with a2==1
a1 a2
NA NA NA
NA.1 NA NA
NA.2 NA NA
Take a look at what (aa$a2 == 1) returns and it may clear things up.
Try
aa[-which(aa$a2 == 1), ]
or
subset(aa, a2 != 1 | is.na(a2))
HTH,
Sundar
juli g. pausas wrote:
Dear colleges,
I do not understand the following behaviour:
aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) )
aa
a1 a2
1
On Thu, 18 Dec 2003 15:03:04 +0100 juli g. pausas wrote:
Dear colleges,
I do not understand the following behaviour:
aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) )
aa
a1 a2
1 1 NA
2 2 NA
3 3 NA
4 4 NA
5 5 NA
6 6 1
7 7 2
8 8 3
9 9 4
10 10 5
On Thu, 18 Dec 2003, juli g. pausas wrote:
Dear colleges,
I do not understand the following behaviour:
aa - data.frame(a1= 1:10, a2= c(rep(NA, 5), 1:5) )
aa[!aa$a2==1, ] # removing rows with a2==1
a1 a2
NA NA NA
NA.1 NA NA
NA.2 NA NA
NA.3 NA NA
NA.4 NA NA
7 7 2
8