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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