Displaying 3 results from an estimated 3 matches for "datmat".
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2006 Mar 27
2
Clustering question \ dist(datmat)
...re highly apprciated, the code below shows what i have done.
clust1<- as.vector(rvm(5,5,15))
clust2<- as.vector(rvm(5,10,15))
clust3<- as.vector(rvm(5,15,15))
clust4<- as.vector(rvm(5,20,15))
clust5<- as.vector(rvm(5,25,15))
data1<- rbind(clust1,clust2,clust3,clust4,clust5)
datmat<- matrix(data1,nrow=25,ncol=1,byrow=TRUE)
circ.plot(datmat)
df<- array(dim=c(25,25))
for (i in 1:25){
for (j in 1:25){
df[i,j]<- 0.5*(1 - cos(datmat[i] - datmat[j]))
}
}
hcA<-hclust(df,method="average")
**************...
2006 Jun 07
1
knn - 10 fold cross validation
Hi,
I was trying to get the optimal 'k' for the knn. To do this I was using the following function :
knn.cvk <- function(datmat, cl, k = 2:9) {
datmatT <- (datmat)
cv.err <- cl.pred <- c()
for (i in k) {
newpre <- as.vector(knn.cv(datmatT, cl, k = i))
cl.pred <- cbind(cl.pred, newpre)
cv.err <- c(cv.err, sum(cl != newpre))
}
k0 <- k[which.min(cv.err)]
print(k0)
return...
2009 Oct 27
4
automatically adjusting axis limits
Dear R users,
I am a newbie. Just switched from MATLAB. So thanks a lot for your
patience.
I have 50000 spectra collected in field. Each spectra has two columns :
Wavelength (56) and the actual measurement.
Each measurement came in a different .txt file on disk (50000 files in
total). I wrote a script that reads every spectra in a for loop and
constructs two variables :
Wavelength (56) and