R help - Mar 2009 - mapping lat and long with maps package

I am trying to overlay a data frame with lat and longitude(which refer to
zip codes) on the map of US that I get by using map ("states").
Is there anyway to do this or do I have to resort to using maptools?

thank you

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The example on the help page would seem to be completely on point if I  
understand your desire to be plotting text at particular long,lat  
coordinates:

?map

text(long, lat, "text")

#
data(ozone)
map("state", xlim = range(ozone$x), ylim = range(ozone$y))
text(ozone$x, ozone$y, ozone$median)
box()

-- 
David Winsemius

On Mar 4, 2009, at 5:04 PM, Alina Sheyman wrote:
> I am trying to overlay a data frame with lat and longitude(which  
> refer to
> zip codes) on the map of US that I get by using map ("states").
> Is there anyway to do this or do I have to resort to using maptools?
>
> thank you
>
> 	[[alternative HTML version deleted]]
>
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