dear R-Community is there a function which sums data "stepwise" exp: 2 1 4 5 Desired result 2 = 2 2+1 = 3 2+1+4 = 7 2+1+4+5 = 12 Is there a built in function for this? Thx Dom -- View this message in context: http://r.789695.n4.nabble.com/stepwise-sum-tp3874606p3874606.html Sent from the R help mailing list archive at Nabble.com.