comp.lang.idl-pvwave archive: archive » Re: Duplicates

Home » Public Forums » archive » Re: Duplicates - a new twist

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

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

Report message to a moderator

[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

Previous Topic:	Re: IDL benchmarks - weird!!
Next Topic:	ENUMLIST in IDLitComponent::RegisterProperty

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 15:09:16 PDT 2025

Total time taken to generate the page: 1.60108 seconds