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Re: Duplicates - a new twist [message #39439]

Tue, 18 May 2004 12:35

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"Martin Doyle" <m.doyle@uea.ac.uk> wrote in message news:d33d6a4b.0405171324.1272c4e0@posting.google.com...
> Hello all,
...
> which are within their countries. However, some of the latitude,
> longitude coordinates lie on the borders of countries and therefore an
> emission is sometimes reported by 2 or more countries for the same
> coordinate (i,e. There are multiple instances of the same coordinate
> within the dataset).

> What I need to do is to look through the dataset and sum the emissions
> when the coordinate is the same, resulting in a dataset with unique
> coordinates and a total emission for each grid point.

You could quickly make a one dimensional "index" array from the coordinates,
like coord = 1000*lat+lon , and use your one column uniq() and where()s.
Of course, handle the decimal points appropriately.
(or make it a string array of coordinates perhaps)

Offhand, it looks like you will need to loop through the uniq(coords) and
take the mean of the sum of where()d points.

Cheers,
bob

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[Message index]

		Re: Duplicates - a new twist By: R.G. Stockwell on Tue, 18 May 2004 12:35
		Re: Duplicates - a new twist By: btt on Tue, 18 May 2004 12:34
		Re: Duplicates - a new twist By: Bruce Bowler on Tue, 18 May 2004 12:10
		Re: Duplicates - a new twist By: btt on Tue, 18 May 2004 05:32
		Re: Duplicates - a new twist By: Chris[1] on Tue, 18 May 2004 04:42
		Re: Duplicates - a new twist By: Chris Lee on Tue, 18 May 2004 00:59

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