#' @title Seuraavat kolme funktiota liittyvat alkupartition muodostamiseen.
#' @param data_matrix data_matrix
#' @param nclusters ncluster
#' @param Z Z

admixture_initialization <- function (data_matrix, nclusters, Z) {
	size_data <- size(data_matrix)
	nloci <- size_data[2] - 1
	n <- max(data_matrix[, ncol(data_matrix)])
	T <- cluster_own(Z, nclusters)
	initial_partition <- zeros(size_data[1], 1)
	for (i in 1:n) {
		kori <- T[i]
		here <- find(data_matrix[, ncol(data_matrix)] == i)
		for (j in 1:length(here)) {
			initial_partition[here[j], 1] <- kori
		}
	}
	return(initial_partition)
}