#R-equivalent of computeMedoidsIndices, requiring a matrix
#(thus potentially breaking "fit-in-memory" hope)
R_computeMedoidsIndices <- function(medoids, series)
{
	nb_series = ncol(series)
	mi = rep(NA,nb_series)
	for (i in 1:nb_series)
		mi[i] <- which.min( colSums( sweep(medoids, 1, series[,i], '-')^2 ) )
	mi
}