[Rd] NA as names of vector from subscripted matrix == bug ?

[Thomas Lumley]

On Mon, 8 Oct 2001, Charles C. Berry wrote:
>
> Is this a bug?
>
> > matrix(1:4,nc=2,dimnames=list(1:2,1:2))[c(1,3)]
>  1 NA
>  1  3


Perhaps a clearer example is
> matrix(1:4,nc=2,dimnames=list(LETTERS[1:2],LETTERS[3:4]))->a
> a[1]
A
1
> a[2]
B
2
> a[3]
NA
 3
> a[4]
NA
 4
>

It's at least a wart that you sometimes get the row names and sometimes
NA.  OTOH it's not clear what the names of a vector extracted from a
matrix *should* be if the vector isn't a single row or column.



	-thomas


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