On Fri, 2004-06-11 at 20:09, Robin Hankin wrote:
> Hi
>
> I want to extract rows of a matrix, and preserve rownames even if only
> one row is selected.
The infamous drop=TRUE default. help("[") goes into this.
Your toy example, two ways:
> a <- matrix(1:9,3,3)
> rownames(a) <- letters[1:3]
> colnames(a) <- letters[1:3]
> a[1,,drop=FALSE]
a b c
a 1 4 7
> a[1,,drop=TRUE]
a b c
1 4 7
Does that help?
Cheers
Jason
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