You mean like cumsum()? > a<-1:10 > b<-cumsum(a) > b [1] 1 3 6 10 15 21 28 36 45 55 -Nick Larson -- View this message in context: http://r.789695.n4.nabble.com/code-for-permutative-operation-tp3354839p3354849.html Sent from the R help mailing list archive at Nabble.com.