comp.lang.idl-pvwave archive: archive » Clustering x,y coordinates with IDL?

Home » Public Forums » archive » Clustering x,y coordinates with IDL?

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

Re: Clustering x,y coordinates with IDL? [message #70315 is a reply to message #70220]

Mon, 29 March 2010 08:38

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

Am 29.03.2010 11:44, schrieb Maxwell Peck:
> 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
>

The IDL function CLUSTER() implements k-means clustering. I think that's
what you want.

Mort

Report message to a moderator

[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

Previous Topic:	Conversion of 2D to 1D
Next Topic:	"Help file not found: idl"

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 16:14:24 PDT 2025

Total time taken to generate the page: 0.00486 seconds