On 18/07/2008, at 8:42 AM, Steve Murray wrote:
<snip>
So what I'm looking to do is, 'pad out' the shorter file, by adding
in the rows with those that are 'missing' from the longer file (ie.
if a particular coordinate isn't present in the shorter file but is
in the 'longer/master' file), and having 'zero' as its Population
Density value (column C).
Aaaaaaarrrrrrghhhhhhhhhh!!! Zero is not the same as a missing value.
Surely to gumdrops you should say ``having NA as its Population
Density value''.
Elsewise you are lying about your data.
cheers,
Rolf Turner
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