NA as names of vector from subscripted matrix == bug ?

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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