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Message-ID: <71F4AB24-C4E3-4823-BF56-FC161308CBC2@bryer.org>
Date: 2009-09-10T15:16:49Z
From: Jason Bryer
Subject: Looping over spatial data

Sorry for what may be a simple question. I am having an issue looping  
over spatial data. Here is the code:

usa.map = read.shape(file.choose()) #Shape file of the US, 51 records

pt = data.frame(x=-73.793, y=42.857)
shapes = Map2poly(usa.map)
shape = shapes[[35]] #This is New York

pip(pt, shape) #This works, returns the point as I expect since it is  
within NY

for(i in 1:length(shapes)) {
	shape = shapes[[i]]
	pip(pt, shape)
	#This is where the error occurs
}

This is the error I get:

Error in inout(pt, shape) : NA/NaN/Inf in foreign function call (arg 4).

Thanks for any help.

-Jason