sigma_init <-
function(data,Y){
sigma<-as.list(unique(Y))
j<-1
data$class<-Y
for(i in unique(Y)) {
Mat_cov<-(cov(data[data$class==i, -match("class", names(data))][,]))
sigma[[j]]<-data.frame(MAT = Mat_cov)
j<-j+1
}
return(sigma)
}
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