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###############################################################################
# TANOVA: test.R
#
# TODO: Add comment
#
# Author: Weihong
# Mar 20, 2009, 2009
###############################################################################
group.ix<-function(f1,f2){
n1<-nlevels(as.factor(f1))
n2<-nlevels(as.factor(f2))
ix<-list()
k<-1
for (i in 1:n1){
for (j in 1:n2){
ix[[k]]<-which(f1==i & f2==j)
k<-k+1
}
}
return (ix)
}
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