Displaying 3 results from an estimated 3 matches for "fixmah".
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fixmap
2003 Aug 11
2
cluster analysis
I'like to do cluster analysis by using mahalanobis distance.
Could you tell me how to do?
2009 Jun 11
1
Cluster analysis, defining center seeds or number of clusters
I use kmeans to classify spectral events in high and low 1/3 octave bands:
#Do cluster analysis
CyclA<-data.frame(LlowA,LhghA)
CntrA<-matrix(c(0.9,0.8,0.8,0.75,0.65,0.65), nrow = 3, ncol=2, byrow=TRUE)
ClstA<-kmeans(CyclA,centers=CntrA,nstart=50,algorithm="MacQueen")
This works well when the actual data shows 1,2 or 3 groups that are not
"too close" in a cross plot.
2004 Dec 15
3
Massive clustering job?
Hi,
I have ~40,000 rows in a database, each of which contains an id column and
20 additional columns of count data.
I want to cluster the rows based on these count vectors.
Their are ~1.6 billion possible 'distances' between pairs of vectors
(cells in my distance matrix), so I need to do something smart.
Can R somehow handle this?
My first thought was to index the database with