[R] Memory limit in Aggregate()

[Guillaume]

Hi Peter,
Thanks for these information.
I used a column concatenating the listBy data to do this aggregation : (I
don't know if it's the best solution, but it seems to work).

aggregateMultiBy <- function(x, by, FUN){
	tableBy = data.frame(by)
	tableBy$byKey = ""
	for(colBy in names(by))
		tableBy$byKey = paste(tableBy$byKey, as.character(tableBy[,colBy]),"")
	
	tableOut <- aggregate(	x = x
					,	by = list(byKey = tableBy$byKey)
					,	FUN = FUN)
	tableOut <- merge(	x = tableOut
				,	y = tableBy
				,	by = "byKey")

	tableOut$byKey <- NULL
	return(tableOut)
}

Thanks again,
Guillaume

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