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Re: Duplicates - a new twist [message #39452 is a reply to message #39450]

Tue, 18 May 2004 00:59

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

In article <d33d6a4b.0405171324.1272c4e0@posting.google.com>, "Martin
Doyle" <m.doyle@uea.ac.uk> wrote:

> Hello all,
> I have a problem which I've searched everywhere to try and solve...many
> posters on this newsgroup have had _similar_ problems but the
> resolutions didn't help me...anyway, here goes; I have a dataset which
> consists of 3 columns: longitude, latitude and a value for an emission
> ....
> 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. Does anyone have
> ...
> Martin

Hi,

;data is fltarr(3,n)

;find possible collisions
d=sqrt(data[0,*]^2+data[1,*]^2)
threshold=1.0 ; numbers after the decimal point.
d=round(d*10^threshold)/10^threshold

;apply the single vector functions here, the result is a *possible* list
of collisions, since any point on a circle centred on the origin will
match, hopefully since your dealing with European data you won't collide
with anything in the Southern atlantic :)

There are probably better ways.

Chris.

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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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