This has every appearance of being a bug. If it is not a bug, can
someone tell me what I am asking for when I ask for "x[x[,2]==0,]". Thanks.
> #here is the toy dataset
> x <- rbind(c(1,1),c(2,2),c(3,3),c(4,0),c(5,0),c(6,NA),
+ c(7,NA),c(8,NA),c(9,NA),c(10,NA)
+ )
> x
[,1] [,2]
[1,] 1 1
[2,] 2 2
[3,] 3 3
[4,] 4 0
[5,] 5 0
[6,] 6 NA
[7,] 7 NA
[8,] 8 NA
[9,] 9 NA
[10,] 10 NA
>
> #it contains rows that have NA's
> x[is.na(x[,2]),]
[,1] [,2]
[1,] 6 NA
[2,] 7 NA
[3,] 8 NA
[4,] 9 NA
[5,] 10 NA
>
> #seems like an unreasonable answer to a reasonable question
> x[x[,2]==0,]
[,1] [,2]
[1,] 4 0
[2,] 5 0
[3,] NA NA
[4,] NA NA
[5,] NA NA
[6,] NA NA
[7,] NA NA
>
> #this is more what I was expecting
> x[which(x[,2]==0),]
[,1] [,2]
[1,] 4 0
[2,] 5 0
>
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