Thankyou very much jim. it worked! but regarding second part of my question, isn't there a way to read the coordinates of intersecting lines with the premises of the map?thanks,
Eliza

> Date: Sun, 23 Mar 2014 14:19:43 +1100
> From: jim@bitwrit.com.au
> To: eliza_botto@hotmail.com
> CC: r-help@r-project.org
> Subject: Re: [R] points with-in boundaries of a map
> 
> On 03/23/2014 01:01 PM, eliza botto wrote:
> > Dear UseRs,
> > I have a question regarding reading the coordinates within a country' map. I drew map of ireland by using the following commands
> > library("maps")
> > library("mapproj")
> > map("world", "ireland")
> > map.axes()
> > You can clearly see the axis labelled. What is want to do is to draw lines (both vertically and horizontally ) at an interval of 0.5. Which means if x-axis starts from -10 then the first be on -10 and second on -9.5 and so on. Similar has to be the case with y-axis.
> > Afterwards I only want to read the coordinates of the point falling with in the boundary of ireland.  I spent quite sometime while going through the previous posts but couldnt find the answer.
> > Thankyou very much in advance,
> > Elisa
> 
> Hi Elis(z)a,
> The grid function doesn't work properly on maps, probably due to the 
> correction for the non-planar nature of the map. Try this:
> 
> abline(v=seq(-10,-6.5,by=0.5))
> abline(h=seq(51.5,55.5,by=0.5))
> 
> Jim
 		 	   		  
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