Description Usage Arguments Value Author(s) Examples
Given the type
of distance measure and agglomeration scheme method
, gr.hclust
performs hierarchical clustering on
Grassmann manifold using fastcluster package, which returns the same object as stats package's implementation while providing more efficient computation.
See hclust
for more details.
1 2 3 4 5 6 7 |
x |
either an array of size (p\times r\times N) or a list of length N whose elements are (p\times r) matrix on Stiefel manifold. |
type |
type of distance measure; |
method |
he agglomeration method to be used. This must be (an unambiguous abbreviation of) one of |
members |
|
an object of class hclust
. See hclust
for details.
Kisung You
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | #-------------------------------------------------------------------
# Generate a dataset with two types of Stiefel elements
#-------------------------------------------------------------------
# group1 : first four columns of (8x8) identity matrix + noise
# group2 : last four columns of (8x8) identity matrix + noise
mydata = list()
sdval = 0.05
diag8 = diag(8)
for (i in 1:10){
mydata[[i]] = qr.Q(qr(diag8[,1:4] + matrix(rnorm(8*4,sd=sdval),ncol=4)))
}
for (i in 11:20){
mydata[[i]] = qr.Q(qr(diag8[,5:8] + matrix(rnorm(8*4,sd=sdval),ncol=4)))
}
## try hierarchical clustering
# compare 'intrinsic' and 'extrinsic' distance types
# and use 'single' hclust option.
hint = st.hclust(mydata, type="intrinsic", method="single")
hext = st.hclust(mydata, type="extrinsic", method="single")
## visualize
opar = par(no.readonly=TRUE)
par(mfrow=c(1,2), pty="s")
plot(hint, main="intrinsic")
plot(hext, main="extrinsic")
par(opar)
|
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