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Re: clustering [message #54963 is a reply to message #54850]

Mon, 23 July 2007 09:08

little davey
Messages: 5
Registered: June 2007

Junior Member

On Jul 17, 10:36 am, nivedita.raghun...@gmail.com wrote:
> Hi all,
>
> I am trying to cluster a (7 x n) array with n_clusters=5. Visually I
> can see 5 distinct clusters, but when I do clust_wts the cluster
> centroids don't end up right. No matter what options I give, clust_wts
> refuses to find the clusters.
>
> Any idea on whats going on ?
>
> Thanks,
> Nivedita

I seem to recall that "clust_wts.pro" just doesn't work. Because of
"work" I don't have time to dig into it, but I have glanced at a file
I have called "myclust_wts.pro" that I copied from the IDL directory.
I recall having stepped through the program, and I found that, oh, I
think it didn't "converge" or something like that. I hate saying this
without having the decency to do my homework, but my memory is that
CLUST_WTS just does not work. The algorithm I thought was not
adequate. I'm looking at where it says:

;Normalized uniformly random cluster weights.
;;Weights = RANDOMU(SEED, N_Variables, N_Clusters) + Zero
av1 = average(array[0,*])
av2 = average(array[1,*])
Weights = RANDOMU(SEED, N_Variables, N_Clusters) + Zero
for k = 0L, N_Clusters-1 do Weights[*,k] = $
(Weights[*,k] / TOTAL(Weights[*,k])) * Variable_Wts

I recall something like the weights and the data simply didn't have
the same data range, so the algorithm failed. Sorry if I'm totally
wrong.

-- Dave K --

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[Message index]

		clustering By: nivedita.raghunath on Tue, 17 July 2007 08:36
		Re: clustering By: Vince Hradil on Thu, 19 July 2007 10:30
		Re: clustering By: nivedita.raghunath on Thu, 19 July 2007 09:12
		Re: clustering By: Vince Hradil on Thu, 19 July 2007 13:46
		Re: clustering By: Conor on Wed, 18 July 2007 12:07
		Re: clustering By: Vince Hradil on Mon, 23 July 2007 11:22
		Re: clustering By: James Kuyper on Mon, 23 July 2007 11:16
		Re: clustering By: little davey on Mon, 23 July 2007 10:14
		Re: clustering By: little davey on Mon, 23 July 2007 09:08
		Re: clustering By: Conor on Mon, 23 July 2007 06:49
		Re: clustering By: nivedita.raghunath on Mon, 23 July 2007 06:45
		Re: Clustering By: Kai Mühlbauer on Tue, 01 November 2011 03:01
		Re: Clustering By: Kai Muehlbauer on Mon, 31 October 2011 08:40
		Re: Clustering By: Jeremy Bailin on Tue, 01 November 2011 12:16
		Re: Clustering By: kidpix on Mon, 31 October 2011 04:56
		Re: Clustering By: Kai Mühlbauer on Fri, 28 October 2011 10:07
		Re: clustering By: kisCA on Wed, 07 March 2012 13:37
		Re: clustering By: Russell[1] on Wed, 07 March 2012 09:32

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