#TODO: setRefClass... to avoid copy data !!
#http://stackoverflow.com/questions/2603184/r-pass-by-reference

#fields: data (can be NULL or provided by user), coeffs (will be computed
#con can be a character string naming a file; see readLines()
#data can be in DB format, on one column : TODO: guess (from header, or col. length...)
epclust = function(data=NULL, con=NULL, raw=FALSE, K, nbPerChunk, ..., where_to_store_tmp_data, and how ?)
#options for tmp files: in RAM, on disk, on DB (can be distributed)
{


	#on input: can be data or con; data handled by writing it to file (ascii or bin ?!),


	if (!is.null(data))
	{
		#full data matrix
		index = 1
		n = nrow(data)
		while (index < n)
		{
			getCoeffs(data
			index = index + nbSeriesPerChunk
		}
	} else if (!is.null(con))
	{
		#incremental connection
		#read it one by one and get coeffs until nbSeriesPerChunk
		#then launch a clustering task............
		readLines()
	} else
		stop("at least 'data' or 'con' argument must be present")

}

getCoeffs = function(series)
{
	#... return wavelets coeffs : compute in parallel !
}