They don't show up as NA's. They are just 0's. The 0 values in the 
states I am interested in are correct, however.

Pete

On 2010/05/30 20:28, Matt Beard wrote:
> Have you looked into functions such as na.omit()?
>
> Matt
>
> On Sun, May 30, 2010 at 7:54 PM, Peter Larson <pslarson2@gmail.com 
> <mailto:pslarson2@gmail.com>> wrote:
>
>     Hello all,
>
>     I have data for several states and no data for most. I just want
>     to subset the states I have data for and ignore the rest.
>
>     Is there anyway to do this? I have a shapefile and have read it in
>     with ReadShapePoly successfully, but I don't need all 50 American
>     states.
>
>     Thanks,
>
>     Pete
>
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