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- gain <- function(database, attribute)
- {
- wynik_d<- unique(database$attribute)
- n<- length(which(wynik_d[1] == database$attribute))
- p<- length(which(wynik_d[2] == database$attribute))
- w<- -(p/(p+n))*log2(p/(p+n))-(n/(p+n))*log2(n/(p+n))
- return(w)
- }
- #database to baza juz wczytana, ktora jest zaladowana
- #attribute to nazwa kolumny, ktora podaje w " "
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