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Clustering x,y coordinates with IDL? [message #70220]

Mon, 29 March 2010 02:44

Maxwell Peck
Messages: 61
Registered: February 2010

Member

Hi All, This is not strictly an IDL question but I'm hoping it's
something simple to do and I'm not missing something painfully
obvious!

I have a set of x,y values e.g.

x = [34.5,36.7,35.6,80.5,81.2,79.3]
y = [50.6,51.2,53.2,48.5,50.3,51.2]

The values will be sparsely clustered overall but tightly within an
approximate 10x10 box. What I'd like to do is replace each clusters
values with the average x,y value. This doesn't have to be 'perfect',
the edges aren't that important.

My initial thought was to use hist_2d or hist_nd to try and calculate
the 2d histogram with a binsize of 10 and use this to average the
values but I can't get it to work. My other thought was using griddata
or something similar, or at worst generating an approximate binary
image and running a window over it.

Any advice or suggestions would be appreciated.

Regards

Max

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[Message index]

		Clustering x,y coordinates with IDL? By: Maxwell Peck on Mon, 29 March 2010 02:44
		Re: Clustering x,y coordinates with IDL? By: Maxwell Peck on Mon, 29 March 2010 13:20
		Re: Clustering x,y coordinates with IDL? By: Mort Canty on Mon, 29 March 2010 08:38

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