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$a2==1, ] # removing rows with a2==1
a1 a2 NA NA NA NA.1 NA NA NA.2 NA NA NA.3 NA NA NA.4 NA NA 7 7 2 8 8 3 9 9 4 10 10 5
I didn't expect a1 to be affected.
Is aa[!aa$a2==1, ] an incorrect way to remove rows? Any other way?
(R 1.8.1. for Windows) Thanks in advance
Juli
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