AdjacencyMatrix <- function(x){
pp <- unique(x)
n <- length(x)
all <- matrix(0, ncol = n, nrow = n)
for(i in 1:length(pp)){
IDs <- which(x %in% pp[i])
all[IDs, IDs] <- 1
}
diag(all) <- 1
return(all)
}
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