toInteger <- function(x, condition)
{
	if (!is.integer(x))
		tryCatch(
			{x = as.integer(x)[1]},
			error = function(e) paste("cannot convert argument",substitute(x),"to integer")
		)
	if (!condition(x))
		stop(paste("argument",substitute(x),"does not verify condition",body(condition)))
	x
}

serialize = function(coeffs, file, append)
{
	#.........
	#C function (from data.frame, type of IDs ??! force integers ? [yes])
	#return raw vector
	#take raw vector, append it (binary mode) to a file
#TODO: appendCoeffs() en C --> serialize et append to file
}

deserialize = function(file, range, serie_length)
{
	#......
	#C function (from file name)
}

getSeries(data, rank=NULL, id=NULL)
{
	#TODO:
}

getCoeffs(.....) #FROM BINARY FILE !!!
{

}