hey i need help with a case in my R project. i have a vector Rt with returns from day 1 till day t now i want to form a new vector r= which is rt = Xt ? Xt?1 then i want to definde positive and negative aggregates r(n)+ _t= 1/n (rt +...+rt?n) I {(rt+...+ rt?n) ?0} r(n)? _t= 1/n (rt +...+rt?n) I {(rt+...+ rt?n) <0} thanks for the help -- View this message in context: http://r.789695.n4.nabble.com/RCOde-need-urgent-HELP-tp4668981.html Sent from the R help mailing list archive at Nabble.com.