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Posted by jim_geissman on 10/09/06 16:20
I have some data -- counts ID'd by location and grid East like this --
Loc East N
CA 100 3
CA 103 5
CA 109 2
CA 110 3
I'm interested in the total of N on either side of the largest gap in
Eastings.
In this case the largest gap is 6 (between 103 and 109), and the sum of
N for the 2 rows below the gap is 8, and for the 2 above the gap it's
5.
The problem is to locate the largest gap, and compute the sum of N for
the cases on either side. There are multiple locations, multiple
Eastings
per location, but only one largest gap. (If there are two largest
gaps, it
does't matter which one is used for the sums.)
I can do this with multiple passes -- first locate the largest gap,
then go
back and locate the Eastings on either side, then sum up the Ns.
That's
realy clumsy, I can't figure out how to do it more quickly, and I'm not
sure
what I'm doing is right. Any help would be appreciated.
Thanks,
Jim Geissman
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