[R] Problem Subsetting Rows that Have NA's

[Ek Esawi]

z <- x[x[,2]==0&!is.na(x[,2]),]  seems to work and get you what you want,
but doesn't answer your question,
z <- x[x[,2]==0&!is.na(x[,2]),]

Best of luck,
EK

On Tue, Oct 24, 2017 at 3:05 PM, BooBoo <booboo at gforcecable.com> wrote:

> 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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